A multifunctional test system for liquid oxygen-methane engine test stand

Abstract

The application provides a multifunctional test system of a liquid oxygen-methane engine test stand, which comprises a gas path system, a liquid path system, a test station and a control module. The gas path system and the liquid path system are connected by pipelines for gas supply, the liquid path system is connected with the test station for providing liquid fuel required by the test station, and the control module is connected with the gas path system and the liquid path system for controlling the operation of the gas path system and the liquid path system. The liquid path system comprises a liquid oxygen storage module, a liquid methane storage module, a liquid oxygen supercooling module, a liquid methane supercooling module, a liquid oxygen conveying module and a liquid methane conveying module. The multifunctional test system is composed of one gas path system, two liquid path systems and two test stations. The two liquid path systems comprise a high-pressure and low-pressure liquid oxygen liquid path module and a high-pressure and low-pressure liquid methane liquid path module, which are connected with one gas path system for gas supply, can convey medium according to requirements, improve the resource sharing of the test equipment, reduce the total cost of equipment construction and maintenance, and improve the efficiency of engine test.

Description

Technical Field

[0001] This invention relates to the field of rocket engine test stand technology, specifically a multi-functional test system for a liquid oxygen methane engine test stand. Background Technology

[0002] In the commercial space sector, driven by increasing demand, the technology of liquid oxygen / methane launch vehicles has developed rapidly. A key factor ensuring successful launches of these vehicles is the availability of reliable liquid oxygen / methane launch vehicle engines. The stability and reliability of these engines are paramount, necessitating the use of rocket engine test stands for testing and verification to reduce failure rates and improve stability.

[0003] Currently, in China's aerospace field, the test systems of traditional liquid oxygen / methane liquid rocket engine test stands are relatively simple, with the low-pressure and high-pressure liquid oxygen / methane systems often existing independently. The implementation of these two test systems requires the construction of separate test stands, resulting in extremely high construction costs. Due to safety distance constraints, a large land area is required, necessitating the construction of redundant equipment and facilities, and the inefficient use of shared infrastructure, further increasing investment and maintenance costs. With the rapid development of liquid oxygen / methane liquid rocket engines, the pace of engine iteration and updates is accelerating, and engine development involves multiple stages and various types of testing. The traditional single-mode engine test stand system can no longer meet the needs and adapt to the development of multiple engine models.

[0004] Therefore, it is necessary to design a liquid oxygen / methane engine test bench system that combines a liquid oxygen / methane low-pressure system, a liquid oxygen / methane high-pressure system, and a liquid oxygen / methane high-low system. The resulting multifunctional test system and operating method should meet the testing needs of liquid oxygen / methane engines in multiple stages, types, sizes, and application scenarios. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-functional test system for a liquid oxygen methane engine test stand, so as to solve the problems that the existing engine test stands cannot meet the test requirements of various types, stages, sizes and application scenarios, as well as the high construction cost.

[0006] This invention provides a multi-functional test system for a liquid oxygen-methane engine test stand. The multi-functional test system includes: a gas path system, a liquid path system, a test station, and a control module. The gas path system and the liquid path system are connected via pipelines for gas supply. The liquid path system is connected to the test station to provide the liquid fuel required for testing. The control module controls the operation of both the gas path system and the liquid path system. The gas path system includes: a first liquid nitrogen storage module, a second liquid nitrogen storage module, a gas generation module, and a gas distribution module. The first liquid nitrogen storage module is connected via pipeline to the gas generation module for gas generation, and the gas generation module is connected via pipeline to the gas distribution module for gas distribution to the liquid path system. The liquid path system includes: a liquid oxygen storage module, a liquid methane storage module, a liquid oxygen subcooling module, a liquid methane subcooling module, a liquid oxygen delivery module, and a liquid methane delivery module. The first liquid nitrogen storage module is connected via pipeline to the liquid oxygen subcooling module. The first liquid oxygen storage module provides supercoolant, and is connected to the liquid oxygen subcooling module via pipeline for liquid oxygen subcooling. Both the liquid oxygen storage module and the liquid oxygen subcooling module are connected to the liquid oxygen delivery module via pipeline for supplying liquid oxygen for commissioning. The second liquid nitrogen storage module provides supercoolant, and is connected to the liquid methane subcooling module via pipeline for liquid methane subcooling. Both the liquid methane storage module and the liquid methane subcooling module are connected to the liquid methane delivery module for liquid methane subcooling. The liquid methane delivery module is connected via pipeline to provide liquid methane for test runs. The test run station includes an engine vehicle test run station and an engine assembly test run station. The engine vehicle test run station is connected to the liquid oxygen delivery module and the liquid methane delivery module for low-pressure test runs. The engine assembly test run station is connected to the liquid oxygen delivery module and the liquid methane delivery module for high-pressure test runs and high-low pressure test runs.

[0007] Furthermore, the liquid circuit system further includes: a liquid oxygen recovery module and a liquid methane recovery module, wherein the liquid oxygen recovery module is connected to the liquid oxygen delivery module via a pipeline for recovering liquid oxygen and its vaporized gas in the pipeline; the liquid methane recovery module is connected to the liquid methane delivery module via a pipeline for recovering liquid methane and its vaporized gas in the pipeline; the liquid oxygen recovery module pressurizes and delivers the recovered liquid oxygen to the liquid oxygen storage module or the liquid oxygen storage tank of the liquid oxygen delivery module via a pipeline; the liquid methane recovery module pressurizes and delivers the recovered liquid methane to the liquid methane storage module or the liquid methane storage tank of the liquid methane delivery module via a pipeline.

[0008] Furthermore, the liquid oxygen delivery module includes a low-pressure liquid oxygen delivery module and a high-pressure liquid oxygen delivery module. The low-pressure liquid oxygen delivery module includes a low-pressure liquid oxygen storage tank, a low-pressure liquid oxygen main pipeline, and low-pressure liquid oxygen branch pipelines, used to deliver low-pressure liquid oxygen for testing to the engine vehicle test station and the engine assembly test station. Liquid oxygen subcooled in the liquid oxygen subcooler of the liquid oxygen subcooling module is delivered to the low-pressure liquid oxygen storage tank through the liquid oxygen subcooler outlet pipeline and the low-pressure liquid oxygen storage tank filling pipeline. The upper part of the low-pressure liquid oxygen storage tank is connected to a first pressurization module. The system connects to the gas distribution module for gas distribution pressurization and releases pressure through the first discharge module; the high-pressure liquid oxygen delivery module includes a high-pressure liquid oxygen storage tank and a high-pressure liquid oxygen main pipeline, used to deliver high-pressure liquid oxygen for testing at the engine assembly test station; the liquid oxygen subcooled in the liquid oxygen subcooler of the liquid oxygen subcooling module is transported to the high-pressure liquid oxygen storage tank through the liquid oxygen subcooler outlet pipeline and the high-pressure liquid oxygen storage tank filling pipeline; the upper part of the high-pressure liquid oxygen storage tank is connected to the gas distribution module through the second pressurization module for gas distribution pressurization and releases pressure through the second discharge module.

[0009] Furthermore, the low-pressure liquid oxygen main pipeline, the low-pressure liquid oxygen branch pipeline, and the high-pressure liquid oxygen main pipeline are all connected to the liquid oxygen recovery module through pipelines to recover liquid oxygen and vaporized gas.

[0010] In an embodiment of the present invention, the liquid methane delivery module includes a low-pressure liquid methane delivery module and a high-pressure liquid methane delivery module. The low-pressure liquid methane delivery module includes a low-pressure liquid methane storage tank, a low-pressure liquid methane main pipeline, and low-pressure liquid methane branch pipelines, used to deliver low-pressure liquid methane for testing to the engine vehicle test station and the engine assembly test station. Liquid methane subcooled in the liquid methane subcooler of the liquid methane subcooling module is delivered to the low-pressure liquid methane storage tank via the liquid methane subcooler outlet pipeline and the low-pressure liquid methane storage tank filling pipeline. The upper part of the low-pressure liquid methane storage tank is connected to a fourth... The boosting module is connected to the gas distribution module for gas distribution and boosting, and is depressurized through the fourth exhaust module; the high-pressure liquid methane delivery module includes a high-pressure liquid methane storage tank and a high-pressure liquid methane main pipeline, used to deliver high-pressure liquid methane for testing to the engine assembly test station; the liquid methane subcooled in the liquid methane subcooler of the liquid methane subcooling module is transported to the high-pressure liquid methane storage tank through the liquid methane subcooler outlet pipeline and the high-pressure liquid methane storage tank filling pipeline; the upper part of the high-pressure liquid methane storage tank is connected to the gas distribution module through the third boosting module for gas distribution and boosting, and is depressurized through the third exhaust module.

[0011] Furthermore, the low-pressure liquid methane main pipeline, the low-pressure liquid methane branch pipeline, and the high-pressure liquid methane main pipeline are all connected to the liquid methane recovery module through pipelines to recover liquid methane and gasified gas.

[0012] Furthermore, the engine vehicle test station is for a low-pressure test of the complete engine; the low-pressure liquid oxygen storage tank is connected to the liquid oxygen inlet of the complete engine through the low-pressure liquid oxygen main pipeline, providing low-pressure liquid oxygen for the test; the low-pressure liquid methane storage tank is connected to the liquid methane inlet of the complete engine through the low-pressure liquid methane main pipeline, providing low-pressure liquid methane for the test; the engine assembly test station includes a turbopump and a gas generator; the low-pressure liquid oxygen storage tank is connected to the low-pressure liquid oxygen main pipeline and the low-pressure liquid oxygen branch pipeline. The gas generator's liquid oxygen inlet is connected to the gas generator via a main pipeline, providing low-pressure liquid oxygen for testing. The high-pressure liquid oxygen storage tank is connected to the turbopump's liquid oxygen inlet via the main high-pressure liquid oxygen pipeline, providing high-pressure liquid oxygen for testing. The low-pressure liquid methane storage tank is connected to the gas generator's liquid methane inlet via the main low-pressure liquid methane pipeline and the branch low-pressure liquid methane pipeline, providing low-pressure liquid methane for testing. The high-pressure liquid methane storage tank is connected to the turbopump's liquid methane inlet via the main high-pressure liquid methane pipeline, providing high-pressure liquid methane for testing.

[0013] In an embodiment of the present invention, the gas generation module includes: a liquid nitrogen storage tank, a liquid nitrogen plunger pump, a liquid nitrogen vaporizer, and a high-pressure nitrogen cylinder group. Liquid nitrogen in the first liquid nitrogen storage module is added to the liquid nitrogen storage tank through a second liquid nitrogen filling pipeline, and then pumped into the liquid nitrogen vaporizer by the liquid nitrogen plunger pump for vaporization. Finally, the vaporized nitrogen is stored in the high-pressure nitrogen cylinder group. The high-pressure nitrogen cylinder group is transported to the nitrogen distribution module through a nitrogen delivery pipeline.

[0014] Furthermore, the nitrogen gas distribution module includes a first gas distribution plate, a second gas distribution plate, a third gas distribution plate, and a fourth gas distribution plate connected in parallel on the nitrogen delivery main pipeline. The first gas distribution plate is connected to the first pressurization module via a first pressurization gas supply pipeline for pressurization gas supply; the second gas distribution plate is connected to the second pressurization module via a second pressurization gas supply pipeline for pressurization gas supply; the third gas distribution plate is connected to the third pressurization module via a third pressurization gas supply pipeline for pressurization gas supply; and the fourth gas distribution plate is connected to the fourth pressurization module via a fourth pressurization gas supply pipeline for pressurization gas supply.

[0015] In an embodiment of the present invention, the first liquid nitrogen storage module provides supercoolant to the liquid oxygen subcooler through a first liquid nitrogen filling pipeline, and the liquid oxygen storage module delivers liquid oxygen to the liquid oxygen subcooler for liquid oxygen subcooling through a liquid oxygen subcooler inlet pipeline; the second liquid nitrogen storage module provides supercoolant to the liquid methane subcooler through a third liquid nitrogen filling pipeline, and the liquid methane storage module delivers liquid methane to the liquid methane subcooler for liquid methane subcooling through a liquid methane subcooler inlet pipeline.

[0016] As can be seen from the above embodiments, the multifunctional test system for a liquid oxygen-methane engine test stand provided by the present invention has at least the following advantages: The multifunctional test system's liquid oxygen-methane engine test stand consists of one gas path system, two liquid path systems, and two test stations. The two liquid path systems include a high- and low-pressure liquid oxygen liquid path module and a high- and low-pressure liquid methane liquid path module. Both liquid path systems share a single gas path system for gas supply, thus enabling the delivery of media to different test stations according to requirements. This allows the test stand to meet the gas supply needs of different engine models, while simultaneously improving resource sharing of the test equipment, significantly reducing the total cost of equipment construction and maintenance, and increasing the efficiency of engine testing.

[0017] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the invention. Attached Figure Description

[0018] The accompanying drawings, which are part of the specification of this invention, illustrate exemplary embodiments of the invention. The drawings, together with the description in the specification, serve to illustrate the principles of the invention.

[0019] Figure 1 The present invention provides a system connection structure diagram of a multi-functional test system for a liquid oxygen methane engine test stand.

[0020] Figure 2 This is a partially enlarged view of the first liquid nitrogen storage module of a multi-functional test system for a liquid oxygen-methane engine test stand provided by the present invention.

[0021] Figure 3 This is a partially enlarged view of the second liquid nitrogen storage module of a multi-functional test system for a liquid oxygen-methane engine test stand provided by the present invention.

[0022] Figure 4 This is a partially enlarged view of the gas generation module of a multi-functional test system for a liquid oxygen methane engine test stand provided by the present invention.

[0023] Figure 5 This is a partially enlarged view of the nitrogen gas distribution module of a multi-functional test system for a liquid oxygen methane engine test stand provided by the present invention.

[0024] Figure 6 This is a partially enlarged view of the liquid oxygen storage tank pressurization and emission module of a multi-functional test system for a liquid oxygen methane engine test bench provided by the present invention.

[0025] Figure 7 This is a partially enlarged view of the liquid methane storage tank pressurization and emission module of a multi-functional test system for a liquid oxygen methane engine test bench provided by the present invention.

[0026] Figure 8This is a partial enlarged view of the liquid oxygen delivery module of a multi-functional test system for a liquid oxygen methane engine test stand provided by the present invention.

[0027] Figure 9 This is a partially enlarged view of the liquid methane delivery module of a multi-functional test system for a liquid oxygen-methane engine test stand provided by the present invention.

[0028] Figure 10 This is a partial enlarged view of the test station of a multi-functional test system for a liquid oxygen methane engine test stand provided by the present invention.

[0029] Figure 11 This is a partially enlarged view of the liquid oxygen recovery module of a multi-functional test system for a liquid oxygen methane engine test stand provided by the present invention.

[0030] Figure 12 This is a partially enlarged view of the liquid methane recovery module of a multi-functional test system for a liquid oxygen-methane engine test stand provided by the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] A - First liquid nitrogen storage module, B - Second liquid nitrogen storage module, C - Gas generation module, D - Nitrogen gas distribution module, E - First booster module, F - Fourth booster module, G - Second booster module, H - Third booster module, J - First emission module, K - Fourth emission module, L - Second emission module, M - Engine vehicle test station, N - Third emission module, P - Liquid oxygen storage module, R - Liquid methane storage module, S - Liquid oxygen recovery module, U - Liquid methane recovery module, V - Liquid methane subcooling module, W - Liquid oxygen subcooling module, X - Liquid methane delivery module, Y - Liquid oxygen delivery module, Z - Engine assembly test station;

[0033] A1 - First liquid nitrogen storage tank, A2 - First liquid nitrogen refueling tanker, A3 - First liquid nitrogen refueling filter, A4 - First liquid nitrogen refueling valve, A5 - First self-pressurizer inlet regulating valve, A6 - Self-pressurizer, A7 - First self-pressurizer outlet valve, A8 - First liquid nitrogen outlet valve, A9 - Liquid oxygen subcooler inlet filter, A10 - Liquid oxygen subcooler liquid nitrogen inlet valve, A11 - First liquid nitrogen storage tank exhaust valve, A12 - First safety discharge valve, A13 - First self-operated exhaust valve, A14 - First safety valve, A15 - Gas generator storage tank liquid delivery valve, AL - First liquid nitrogen storage tank level gauge, AP - First liquid nitrogen storage tank pressure sensor;

[0034] B1 - Second liquid nitrogen storage tank, B2 - Second liquid nitrogen refueling tanker, B3 - Second liquid nitrogen refueling filter, B4 - Second liquid nitrogen refueling valve, B5 - Second self-pressurizer inlet regulating valve, B6 - Second self-pressurizer, B7 - Second self-pressurizer outlet valve, B8 - Second liquid nitrogen outlet valve, B9 - Liquid methane subcooler inlet filter, B10 - Liquid methane subcooler liquid nitrogen inlet valve, B11 - Second liquid nitrogen storage tank exhaust valve, B12 - Second safety exhaust valve, B13 - Second self-operated exhaust valve, B14 - Second safety valve, BL - Second liquid nitrogen storage tank level gauge, BP - Second liquid nitrogen storage tank pressure sensor;

[0035] C1-Liquid nitrogen storage tank, C2-Liquid nitrogen plunger pump, C3-Liquid nitrogen vaporizer, C4-High-pressure nitrogen cylinder group, C5-High-pressure nitrogen cylinder group gas supply valve, C6-High-pressure nitrogen pipeline isolation valve;

[0036] D1 - First gas distribution plate, D2 - Second gas distribution plate, D3 - Third gas distribution plate, D4 ​​- Fourth gas distribution plate, D5 - Liquid oxygen collection tank gas supply valve, D6 - Liquid methane collection tank gas supply valve;

[0037] E1 - First liquid oxygen main booster solenoid valve, E2 - First liquid oxygen auxiliary booster solenoid valve, E3 - First liquid oxygen main booster orifice plate, E4 - First liquid oxygen auxiliary booster orifice plate, E5 - Liquid oxygen low-pressure booster filter, E6 - Liquid oxygen low-pressure booster manual valve, EP - Liquid oxygen low-pressure storage tank pressure sensor.

[0038] F1 - Fourth liquid methane main booster solenoid valve, F2 - Fourth liquid methane auxiliary booster solenoid valve, F3 - Fourth liquid methane main booster orifice, F4 - Fourth liquid methane auxiliary booster orifice plate, F5 - Liquid methane low-pressure booster filter, F6 - Liquid methane low-pressure booster manual valve, FP - Liquid methane low-pressure storage tank pressure sensor;

[0039] G1-Second liquid oxygen main booster solenoid valve, G2-Second liquid oxygen auxiliary booster solenoid valve, G3-Second liquid oxygen main booster plate, G4-Second liquid oxygen auxiliary booster plate, G5-Liquid oxygen high-pressure booster filter, G6-Liquid oxygen high-pressure booster manual valve, GP-Liquid oxygen high-pressure storage tank pressure sensor.

[0040] H1 - Third liquid methane main booster solenoid valve, H2 - Third liquid methane auxiliary booster solenoid valve, H3 - Third liquid methane main booster plate, H4 - Third liquid methane auxiliary booster plate, H5 - Liquid methane high-pressure booster filter, H6 - Liquid methane high-pressure booster manual valve, HP - Liquid methane high-pressure storage tank pressure sensor.

[0041] J1 - First safety discharge hand valve, J2 - First discharge safety valve, J3 - First bypass discharge valve, J4 - First anti-pressure stagnation hand valve, J5 - First check valve, J6 - First exhaust silencer;

[0042] K1 - Fourth safety discharge hand valve, K2 - Fourth discharge safety valve, K3 - Fourth bypass discharge valve, K4 - Fourth anti-backflow hand valve, K5 - Fourth check valve, K6 - Second methane discharge flame arrester, K7 - Fourth exhaust silencer;

[0043] L1 - Second safety discharge valve, L2 - Second discharge safety valve, L3 - Second bypass discharge valve, L4 - Second anti-backflow valve, L5 - Second check valve, L6 - Second exhaust muffler;

[0044] N1 - Third safety discharge hand valve, N2 - Third discharge safety valve, N3 - Third bypass discharge valve, N4 - Third anti-backflow hand valve, N5 - Third check valve, N6 - First methane discharge flame arrester, N7 - Third exhaust silencer;

[0045] M1 - Engine unit;

[0046] O1-Low-pressure liquid oxygen storage tank, O2-High-pressure liquid oxygen storage tank, O3-High-pressure liquid methane storage tank, O4-Low-pressure liquid methane storage tank, OL1-Low-pressure liquid oxygen storage tank level gauge, OL2-High-pressure liquid oxygen storage tank level gauge, OL3-High-pressure liquid methane storage tank level gauge, OL4-Low-pressure liquid methane storage tank level gauge;

[0047] P1 - Liquid oxygen storage tank, P2 - Liquid oxygen refueling tanker, P3 - Liquid oxygen refueling filter, P4 - Liquid oxygen refueling valve, P5 - Third self-pressurizer inlet regulating valve, P6 - Third self-pressurizer, P7 - Third self-pressurizer outlet valve, P8 - Liquid oxygen outlet valve, P9 - Liquid oxygen low-pressure storage tank inlet filter, P10 - Liquid oxygen low-pressure storage tank inlet valve, P11 - Liquid oxygen high-pressure storage tank inlet filter, P12 - Liquid oxygen high-pressure storage tank inlet valve, P13 - Liquid oxygen storage tank exhaust valve, P14 - Third safety exhaust valve, P15 - Third self-operated exhaust valve, P16 - Third safety valve, PL - Liquid oxygen storage tank level gauge, PP - Liquid oxygen storage tank pressure sensor;

[0048] R1 - Liquid methane storage tank, R2 - Liquid methane refueling tank truck, R3 - Liquid methane refueling filter, R4 - Liquid methane refueling valve, R5 - Fourth self-pressurizer inlet regulating valve, R6 - Fourth self-pressurizer, R7 - Fourth self-pressurizer outlet valve, R8 - Liquid methane outlet valve, R9 - Liquid methane low-pressure storage tank inlet filter, R10 - Liquid methane low-pressure storage tank inlet valve, R11 - Liquid methane high-pressure storage tank inlet filter, R12 - Liquid methane high-pressure storage tank inlet valve, R13 - Liquid methane storage tank exhaust valve, R14 - Fourth safety exhaust valve, R15 - Fourth self-operated exhaust valve, R16 - Fourth safety valve, RL - Liquid methane storage tank level gauge, RP - Liquid methane storage tank pressure sensor;

[0049] S1 - Liquid oxygen collection tank, S2 - Liquid oxygen collection tank discharge safety valve, S3 - Liquid oxygen collection tank discharge bypass valve, S4 - Liquid oxygen collection tank recovery valve, S5 - Liquid oxygen recovery path filter, SL - Liquid oxygen collection tank level gauge, SP - Liquid oxygen collection tank pressure sensor;

[0050] U1-Liquid methane collection tank, U2-Liquid methane collection tank discharge safety valve, U3-Liquid methane collection tank discharge bypass valve, U4-Liquid methane collection tank recovery valve, U5-Liquid methane recovery path filter, UL-Liquid methane collection tank level gauge, UP-Liquid methane collection tank pressure sensor;

[0051] V1 - Liquid methane subcooler, V2 - Liquid methane subcooler inlet valve, V3 - Liquid methane subcooler outlet valve, VT - Liquid methane subcooler outlet temperature sensor, VL - Liquid methane subcooler level sensor;

[0052] W1 - Liquid oxygen subcooler, W2 - Liquid oxygen subcooler inlet valve, W3 - Liquid oxygen subcooler outlet valve, WT - Liquid oxygen subcooler outlet temperature sensor, WL - Liquid oxygen subcooler level sensor;

[0053] X1 - Low-pressure liquid methane storage tank outlet valve; X2 - Liquid methane low-pressure circuit turbine flow meter; X3 - Engine liquid methane low-pressure circuit shut-off valve; X4 - Engine liquid methane low-pressure circuit bellows; X5 - Engine liquid methane pump inlet filter; X6 - Gas generator liquid methane low-pressure circuit shut-off valve; X7 - Gas generator liquid methane low-pressure circuit bellows; X8 - Gas generator liquid methane inlet filter; X9 - Gas generator liquid methane low-pressure circuit drain valve; X10 - Liquid methane low-pressure circuit exhaust valve; X11 - High-pressure liquid methane storage tank outlet valve; X12 - Liquid methane high-pressure circuit turbine flow meter; X13 - Liquid methane high-pressure... X14 - Liquid methane high-pressure cavitation pipe, X15 - Turbine pump liquid methane inlet valve, X16 - Liquid methane high-pressure drain valve, X17 - Liquid methane high-pressure exhaust valve, X18 - Engine liquid methane low-pressure drain valve, X19 - Liquid methane collection tank inlet valve, XP1 - Engine liquid methane low-pressure pressure sensor, XP2 - Liquid methane high-pressure pressure sensor, XP3 - Gas generator liquid methane low-pressure pressure sensor, XT1 - Engine liquid methane low-pressure temperature sensor, XT2 - Liquid methane high-pressure temperature sensor, XT3 - Gas generator liquid methane low-pressure temperature sensor;

[0054] Y1 - Low-pressure liquid oxygen storage tank outlet valve; Y2 - Liquid oxygen low-pressure circuit turbine flow meter; Y3 - Whole engine liquid oxygen low-pressure circuit shut-off valve; Y4 - Whole engine liquid oxygen low-pressure circuit bellows; Y5 - Whole engine liquid oxygen pump inlet filter; Y6 - Gas generator liquid oxygen low-pressure circuit shut-off valve; Y7 - Gas generator liquid oxygen low-pressure circuit bellows; Y8 - Gas generator liquid oxygen inlet filter; Y9 - Gas generator liquid oxygen low-pressure circuit drain valve; Y10 - Liquid oxygen low-pressure circuit exhaust valve; Y11 - High-pressure liquid oxygen storage tank outlet valve; Y12 - Liquid oxygen high-pressure circuit turbine flow meter; Y13 - Liquid oxygen high-pressure circuit... Filter, Y14-Liquid oxygen high-pressure circuit cavitation pipe, Y15-Turbine pump liquid oxygen inlet valve, Y16-Liquid oxygen high-pressure circuit drain valve, Y17-Liquid oxygen high-pressure circuit exhaust valve, Y18-Enterprise liquid oxygen low-pressure circuit drain valve, Y19-Liquid oxygen collection tank inlet valve, YP1-Enterprise liquid oxygen low-pressure circuit pressure sensor, YP2-Liquid oxygen high-pressure circuit pressure sensor, YP3-Gas generator liquid oxygen low-pressure circuit pressure sensor, YT1-Enterprise liquid oxygen low-pressure circuit temperature sensor, YT2-Liquid oxygen high-pressure circuit temperature sensor, YT3-Gas generator liquid oxygen low-pressure circuit temperature sensor;

[0055] Z1 - Turbo pump, Z2 - Gas generator;

[0056] HK1 - First control device, HK2 - Second control device, HK3 - Third control device, HK4 - Fourth control device, HK5 - Fifth control device, HK6 - Sixth control device;

[0057] a1 - First liquid nitrogen tank filling pipeline, a2 - First liquid nitrogen tank self-pressurization pipeline, a3 - First liquid nitrogen filling pipeline, a4 - First liquid nitrogen tank discharge pipeline, a5 - Second liquid nitrogen filling pipeline;

[0058] b1 - Second liquid nitrogen tank filling pipeline, b2 - Second liquid nitrogen tank self-pressurization pipeline, b3 - Third liquid nitrogen filling pipeline, b4 - Second liquid nitrogen tank discharge pipeline;

[0059] c0 - main nitrogen delivery pipeline, c1 - first nitrogen branch pipeline, c2 - second nitrogen branch pipeline, c3 - third nitrogen branch pipeline, c4 - fourth nitrogen branch pipeline;

[0060] d1 - First pressurized air supply line, d2 - Second pressurized air supply line, d3 - Third pressurized air supply line, d4 - Fourth pressurized air supply line, d5 - Fifth pressurized air supply line, d6 - Sixth pressurized air supply line;

[0061] e1 - Liquid oxygen low-pressure main booster pipeline, e2 - Liquid oxygen low-pressure auxiliary booster pipeline; f1 - Liquid methane low-pressure main booster pipeline, f2 - Liquid methane low-pressure auxiliary booster pipeline; g1 - Liquid oxygen high-pressure main booster pipeline, g2 - Liquid oxygen high-pressure auxiliary booster pipeline; h1 - Liquid methane high-pressure main booster pipeline, h2 - Liquid methane high-pressure auxiliary booster pipeline;

[0062] j1-Liquid oxygen low-pressure booster exhaust pipeline, j2-Liquid oxygen low-pressure bypass exhaust pipeline, j3-Liquid oxygen low-pressure anti-stagnation pipeline.

[0063] k1-Liquid methane low-pressure booster exhaust pipe, k2-Liquid methane low-pressure bypass exhaust pipe, k3-Liquid methane low-pressure anti-stress pipe;

[0064] l1-Liquid oxygen high-pressure booster discharge pipeline, l2-Liquid oxygen high-pressure bypass exhaust pipeline, l3-Liquid oxygen high-pressure anti-stress pipeline.

[0065] n1-Liquid methane high-pressure booster exhaust pipeline, n2-Liquid methane high-pressure bypass exhaust pipeline, n3-Liquid methane high-pressure anti-backflow pipeline;

[0066] p1 - ​​Liquid oxygen storage tank filling pipeline, p2 - Liquid oxygen storage tank self-pressurization pipeline, p3 - Low-pressure liquid oxygen storage tank filling pipeline, p4 - High-pressure liquid oxygen storage tank filling pipeline, p5 - Liquid oxygen storage tank discharge pipeline;

[0067] r1 - Liquid methane storage tank filling pipeline, r2 - Liquid methane storage tank self-pressurization pipeline, r3 - Low-pressure liquid methane storage tank filling pipeline, r4 - High-pressure liquid methane storage tank filling pipeline, r5 - Liquid methane storage tank discharge pipeline;

[0068] s1 - Liquid oxygen collection tank recovery pipeline, s2 - Liquid oxygen collection tank safety discharge pipeline, s3 - Liquid oxygen collection tank discharge bypass pipeline;

[0069] u1 - Liquid methane collection tank recovery pipeline, u2 - Liquid methane collection tank safety discharge pipeline, u3 - Liquid methane collection tank discharge bypass pipeline;

[0070] v1 - Liquid methane subcooler inlet pipe, v2 - Liquid methane subcooler outlet pipe; w1 - Liquid oxygen subcooler inlet pipe, w2 - Liquid oxygen subcooler outlet pipe;

[0071] x1-Low-pressure liquid methane main line, x2-Low-pressure liquid methane branch line, x3-High-pressure liquid methane main line, x4-Low-pressure liquid methane drain line of gas generator, x5-High-pressure liquid methane drain line, x6-Low-pressure liquid methane exhaust line, x7-High-pressure liquid methane exhaust line, x8-Low-pressure liquid methane drain line of the whole engine;

[0072] y1-Low-pressure liquid oxygen main pipeline, y2-Low-pressure liquid oxygen branch pipeline, y3-High-pressure liquid oxygen main pipeline, y4-Low-pressure liquid oxygen drain pipeline of gas generator, y5-High-pressure liquid oxygen drain pipeline, y6-Low-pressure liquid oxygen exhaust pipeline, y7-High-pressure liquid oxygen exhaust pipeline, y8-Low-pressure liquid oxygen drain pipeline of the whole engine. Detailed Implementation

[0073] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0074] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0075] This invention provides a multi-functional test system for a liquid oxygen-methane engine test stand, such as... Figures 1-12 The diagram shows the structural connections of the multifunctional testing system. In a specific embodiment, the multifunctional testing system includes: a gas system, a liquid system, a test station, and a control module. The gas system and liquid system are connected via pipelines for gas supply. The liquid system is connected to the test station to provide the liquid fuel required for testing. The control module controls the operation of the gas system and liquid system, and provides fuel to the test station.

[0076] The gas supply system includes: a first liquid nitrogen storage module A, a second liquid nitrogen storage module B, a gas generation module C, and a gas distribution module D. The first liquid nitrogen storage module A is connected to the gas generation module C for gas generation, and the gas generation module C is connected to the gas distribution module D for distributing gas to the liquid nitrogen supply system.

[0077] In this embodiment, the first liquid nitrogen storage module A is used to store and supply liquid nitrogen, including a first liquid nitrogen storage tank A1. The first liquid nitrogen storage tank A1 is connected to a first liquid nitrogen filling tanker A2 via a first liquid nitrogen filling pipeline a1 for filling with liquid nitrogen. A first liquid nitrogen storage tank self-pressurization pipeline a2 is connected to the first liquid nitrogen storage tank A1, with its upstream connected to the bottom of the first liquid nitrogen storage tank A1 and its downstream connected to the top of the first liquid nitrogen storage tank A1. The first liquid nitrogen storage tank A1 is connected to a liquid oxygen subcooling module W via a first liquid nitrogen filling pipeline a3. A discharge pipeline a4 is provided downstream of the first liquid nitrogen storage tank self-pressurization pipeline a2. A second liquid nitrogen filling pipeline a5 is connected to the first liquid nitrogen filling pipeline a3.

[0078] The first liquid nitrogen storage tank filling pipeline a1 is equipped with a first liquid nitrogen filling filter A3 for filtering liquid nitrogen and a first liquid nitrogen filling valve A4 for filling control.

[0079] The first liquid nitrogen storage tank is equipped with a first self-pressurizing inlet regulating valve A5, a first self-pressurizing device A6, and a first self-pressurizing outlet valve A7 sequentially along the direction of pressurization flow on the self-pressurizing pipeline a2.

[0080] The first liquid nitrogen filling pipeline a3 is sequentially equipped with a first liquid nitrogen outlet valve A8 for liquid nitrogen outlet control, a liquid oxygen subcooler inlet filter A9 for filtering liquid nitrogen, and a liquid oxygen subcooler liquid nitrogen inlet valve A10 for controlling the liquid nitrogen flow rate.

[0081] The first liquid nitrogen storage tank discharge pipeline a4 is a parallel pipeline, which merges and connects downstream. One pipeline is equipped with a manual vent valve A11 for manual venting of the first liquid nitrogen storage tank and a self-operated vent valve A13 for automatically opening and discharging based on a set pressure value. The other pipeline is equipped with a first safety vent valve A12 for safe manual venting. Both pipelines are connected downstream to a first safety valve A14 for the safe discharge of liquid nitrogen from the storage tank.

[0082] The upstream end of the second liquid nitrogen filling pipeline a5 is equipped with a gas storage tank liquid delivery valve A15, which is used for liquid nitrogen supply control.

[0083] A first liquid nitrogen storage tank A1 is equipped with a first liquid nitrogen storage tank level gauge AL for monitoring the tank level. A first liquid nitrogen storage tank pressure sensor AP is installed downstream of the first liquid nitrogen storage tank A1, near the first liquid nitrogen storage tank A1, for monitoring the tank pressure.

[0084] The second liquid nitrogen storage module B is used for storing and supplying liquid nitrogen, including a second liquid nitrogen storage tank B1. The second liquid nitrogen storage tank B1 is connected to a second liquid nitrogen filling tanker B2 via a second liquid nitrogen filling pipeline b1. A second liquid nitrogen storage tank self-pressurization pipeline b2 is connected to the second liquid nitrogen storage tank B1, with its upstream connected to the bottom of the second liquid nitrogen storage tank B1 and its downstream connected to the top of the second liquid nitrogen storage tank B1. The second liquid nitrogen storage tank B1 is connected to a liquid methane subcooling module V via a second liquid nitrogen filling pipeline b3. A second liquid nitrogen storage tank discharge pipeline b4 is installed downstream of the second liquid nitrogen storage tank self-pressurization pipeline b2.

[0085] The second liquid nitrogen storage tank filling pipeline b1 is equipped with a second liquid nitrogen filling filter B3 for filtering liquid nitrogen and a second liquid nitrogen filling valve B4 for filling control.

[0086] The second liquid nitrogen storage tank is equipped with a second self-pressurizer inlet regulating valve B5, a second self-pressurizer B6, and a second self-pressurizer outlet valve B7 sequentially along the direction of pressurization flow on the self-pressurization pipeline b2.

[0087] The third liquid nitrogen filling pipeline b3 is sequentially equipped with a second liquid nitrogen outlet valve B8 for liquid nitrogen outlet control, a liquid methane subcooler inlet filter B9 for filtering liquid nitrogen, and a liquid methane subcooler liquid nitrogen inlet valve B10 for controlling the liquid nitrogen flow rate.

[0088] The second liquid nitrogen storage tank discharge pipeline b4 is a parallel pipeline, which merges and connects downstream. One pipeline is equipped with a second liquid nitrogen storage tank venting manual valve B11 for manual venting and a second self-operated venting valve B13 for automatic venting based on a set pressure value. The other pipeline is equipped with a second safety venting valve A12 for safe manual venting. Both pipelines are connected downstream to a second safety valve B14 for safe venting of the liquid nitrogen storage tank.

[0089] The second liquid nitrogen storage tank B1 is equipped with a second liquid nitrogen storage tank level gauge BL for monitoring the tank level. The second liquid nitrogen storage tank pressure sensor BP is installed downstream of the pressurization pipeline b2 near the second liquid nitrogen storage tank B1 for monitoring the tank pressure.

[0090] The liquid system includes: a liquid oxygen storage module P, a liquid methane storage module R, a liquid oxygen subcooling module W, a liquid methane subcooling module V, a liquid oxygen delivery module Y, and a liquid methane delivery module X. Specifically, the first liquid nitrogen storage module A is connected to the liquid oxygen subcooling module W via pipeline to provide subcoolant; the liquid oxygen storage module P is connected to the liquid oxygen subcooling module W via pipeline for liquid oxygen subcooling; and both the liquid oxygen storage module P and the liquid oxygen subcooling module W are connected to the liquid oxygen delivery module Y via pipeline to provide liquid oxygen for commissioning.

[0091] The second liquid nitrogen storage module B is connected to the liquid methane subcooling module V through a pipeline to provide subcoolant. The liquid methane storage module R is connected to the liquid methane subcooling module V through a pipeline to subcool liquid methane. Both the liquid methane storage module R and the liquid methane subcooling module V are connected to the liquid methane delivery module X through pipelines to provide liquid methane for commissioning.

[0092] In this embodiment, the liquid oxygen storage module P is used to store and supply liquid oxygen, including a liquid oxygen storage tank P1. The liquid oxygen storage tank P1 is connected to a liquid oxygen filling tanker P2 via a liquid oxygen filling pipeline p1 for filling with liquid oxygen. A self-pressurizing pipeline p2 is connected to the liquid oxygen storage tank P1, with its upstream end connected to the bottom of the liquid oxygen storage tank P1 and its downstream end connected to the top of the liquid oxygen storage tank P1. The liquid oxygen storage tank P1 is connected to a liquid oxygen delivery module Y via a low-pressure liquid oxygen filling pipeline p3 and a high-pressure liquid oxygen filling pipeline p4, respectively, for supplying liquid oxygen. A liquid oxygen storage tank discharge pipeline p5 is installed downstream of the self-pressurizing pipeline p2.

[0093] The liquid oxygen storage tank filling pipeline p1 is equipped with a liquid oxygen filling filter P3 for filtering liquid oxygen and a liquid oxygen filling valve P4 for filling control.

[0094] The liquid oxygen storage tank has a third self-pressurizing inlet regulating valve P5, a third self-pressurizing device P6, and a third self-pressurizing outlet valve P7 installed sequentially along the direction of pressurization flow on the self-pressurizing pipeline p2.

[0095] Along the liquid outlet direction, the low-pressure liquid oxygen storage tank filling pipeline p3 is equipped with a liquid oxygen outlet valve P8 for liquid outlet control, a liquid oxygen low-pressure storage tank inlet filter P9 for filtering liquid oxygen, and a liquid oxygen low-pressure storage tank inlet valve P10 for controlling the liquid oxygen flow rate.

[0096] The upstream end of the high-pressure liquid oxygen tank filling pipeline p4 is connected to the low-pressure liquid oxygen tank filling pipeline p3 at the downstream port of the liquid oxygen outlet valve P8. Along the outlet direction, the high-pressure liquid oxygen tank filling pipeline p4 is sequentially equipped with a liquid oxygen high-pressure tank inlet filter P11 for filtering liquid oxygen and a liquid oxygen high-pressure tank inlet valve P12 for controlling the liquid oxygen flow rate.

[0097] The liquid oxygen storage tank discharge pipeline p5 is a parallel pipeline, which merges and connects downstream. One pipeline is equipped with a liquid oxygen storage tank vent valve P13 for manual venting and a third self-operated vent valve P15 for automatic venting based on a set pressure value. The other pipeline is equipped with a third safety vent valve P14 for safe manual venting. Both pipelines are connected downstream to a third safety valve P16 for safe venting of the liquid oxygen storage tank.

[0098] A liquid oxygen storage tank P1 is equipped with a liquid oxygen storage tank level gauge PL for monitoring the tank level. A liquid oxygen storage tank pressure sensor PP is installed downstream of the pressurization pipeline p2, near the liquid oxygen storage tank P1, for monitoring the tank pressure.

[0099] The liquid methane storage module R is used to store and supply liquid methane, and includes a liquid methane storage tank R1. The liquid methane storage tank R1 is connected to a liquid methane filling tanker R2 via a liquid methane filling pipeline r1. A self-pressurization pipeline r2 is connected to the liquid methane storage tank R1, with its upstream end connected to the bottom of the tank and its downstream end connected to the top. The liquid methane storage tank R1 is connected to a liquid methane delivery module X via a low-pressure liquid methane filling pipeline r3 and a high-pressure liquid methane filling pipeline r4, respectively, for supplying liquid methane. A liquid methane discharge pipeline r5 is located downstream of the self-pressurization pipeline r2.

[0100] The liquid methane storage tank filling pipeline r1 is equipped with a liquid methane filling filter R3 for filtering liquid methane and a liquid methane filling valve R4 for filling control.

[0101] The liquid methane storage tank is equipped with a fourth self-pressurizer inlet regulating valve R5, a fourth self-pressurizer R6, and a fourth self-pressurizer outlet valve R7 sequentially along the direction of pressurization flow on the self-pressurization pipeline r2.

[0102] The low-pressure liquid methane storage tank filling pipeline r3 is sequentially equipped with a liquid methane outlet valve R8 for liquid discharge control, a liquid methane low-pressure storage tank inlet filter R9 for filtering liquid methane, and a liquid methane low-pressure storage tank inlet valve R10 for controlling the liquid methane flow rate.

[0103] The upstream end of the high-pressure liquid methane storage tank filling pipeline r4 is connected to the low-pressure liquid methane storage tank filling pipeline r3 at the downstream port of the liquid methane outlet valve R8. Along the outlet direction, the high-pressure liquid methane storage tank filling pipeline r4 is sequentially equipped with a liquid methane high-pressure tank inlet filter R11 for filtering liquid methane and a liquid methane high-pressure tank inlet valve R12 for controlling the liquid methane flow rate.

[0104] The liquid methane storage tank discharge pipeline r5 is a parallel pipeline, which merges and connects downstream. One pipeline is equipped with a liquid methane storage tank vent valve R13 for manual venting and a fourth self-operated vent valve R15 for automatic venting based on a set pressure value. The other pipeline is equipped with a fourth safety vent valve R14 for safe manual venting. Both pipelines are connected downstream to a fourth safety valve R16 for safe venting of the liquid methane storage tank.

[0105] A liquid methane storage tank R1 is equipped with a liquid methane storage tank level gauge RL for monitoring the tank level. A liquid methane storage tank pressure sensor RP is installed downstream of the pressurization pipeline r2, near the liquid methane storage tank R1, for monitoring the tank pressure.

[0106] The liquid oxygen subcooling module W is used to subcool the liquid oxygen flowing out of the liquid oxygen storage tank P1, and includes a liquid oxygen subcooler W1. The first liquid nitrogen storage module A provides subcoolant to the liquid oxygen subcooler W1 through the first liquid nitrogen filling pipeline a3. The liquid oxygen subcooler W1 is connected to the low-pressure liquid oxygen storage tank filling pipeline p3 through the liquid oxygen subcooler inlet pipeline w1, so that the liquid oxygen in the liquid oxygen storage tank P1 is introduced into the liquid oxygen subcooler W1 for subcooling. The liquid oxygen subcooler W1 also has a liquid oxygen subcooler outlet pipeline w2, which is connected to the low-pressure liquid oxygen storage tank filling pipeline p3 and the high-pressure liquid oxygen storage tank filling pipeline p4, respectively, to provide subcooled liquid oxygen to the liquid oxygen delivery module Y.

[0107] A liquid oxygen subcooler inlet valve W2 is installed on the liquid oxygen subcooler inlet pipe W1.

[0108] The liquid oxygen subcooler outlet pipe w2 is equipped with a liquid oxygen subcooler outlet valve W3 and a liquid oxygen subcooler outlet temperature sensor WT.

[0109] The liquid oxygen subcooler W1 is equipped with a liquid oxygen subcooler level sensor WL for detecting the liquid level height.

[0110] The liquid methane subcooling module V is used to subcool the liquid oxygen flowing out of the liquid methane storage tank R1, and includes a liquid methane subcooler V1. The second liquid nitrogen storage module B provides subcoolant to the liquid methane subcooler V1 through the third liquid nitrogen filling pipeline b3. The liquid methane subcooler V1 is connected to the low-pressure liquid methane storage tank filling pipeline r3 through the liquid methane subcooler inlet pipeline v1, which introduces the liquid methane in the liquid methane storage tank R1 into the liquid methane subcooler V1 for subcooling. The liquid methane subcooler V1 also has a liquid methane subcooler outlet pipeline v2, which is connected to the low-pressure liquid methane storage tank filling pipeline r3 and the high-pressure liquid methane storage tank filling pipeline r4, respectively, to provide subcooled liquid methane to the liquid methane delivery module X.

[0111] A liquid methane subcooler inlet valve V2 is installed on the liquid methane subcooler inlet pipe V1.

[0112] The liquid methane subcooler outlet pipe v2 is equipped with a liquid methane subcooler outlet valve V3 and a liquid methane subcooler outlet temperature sensor VT.

[0113] The liquid methane subcooler V1 is equipped with a liquid methane subcooler level sensor WL for detecting the liquid level height.

[0114] The test stations include: engine vehicle test station M and engine assembly test station Z. Among them, engine vehicle test station M is connected to liquid oxygen delivery module Y and liquid methane delivery module X, and is used for low-pressure test.

[0115] The engine assembly test station Z is connected to the liquid oxygen delivery module Y and the liquid methane delivery module X, and is used for high-pressure test and high-low pressure test.

[0116] In a specific embodiment of the present invention, the control module includes a first control device HK1, a second control device HK2, a third control device HK3, a fourth control device HK4, a fifth control device HK5, and a sixth control device HK6. The first control device HK1 controls and connects to the first liquid nitrogen storage module A, the liquid oxygen storage module B, and the liquid oxygen subcooling module W. The second control device HK2 controls and connects to the second liquid nitrogen storage module B, the liquid methane storage module R, and the liquid methane subcooling module V. The third control device HK3 controls and connects to the liquid oxygen delivery module Y, the gas generation module C, and the gas distribution module D. The fourth control device HK4 controls and connects to the liquid oxygen delivery module Y and the gas distribution module D. The fifth control device HK5 and the sixth control device HK6 both control and connect to the liquid methane delivery module X and the gas distribution module D.

[0117] In a specific embodiment of the present invention, the liquid circuit system further includes: a liquid oxygen recovery module S and a liquid methane recovery module U. The liquid oxygen recovery module S is connected to the liquid oxygen delivery module Y via a pipeline, and is used to recover liquid oxygen and its vaporized gas from the pipeline.

[0118] The liquid methane recovery module U is connected to the liquid methane delivery module X via a pipeline, and is used to recover the liquid methane and its vaporized gas in the pipeline.

[0119] The liquid oxygen recovery module S pressurizes the liquid oxygen recovered inside and transports it through pipelines to the liquid oxygen storage tank of the liquid oxygen storage module P or the liquid oxygen delivery module Y.

[0120] The liquid methane recovery module U pressurizes the liquid methane recovered inside and transports it through pipelines to the liquid methane storage tank of the liquid methane storage module R or the liquid methane delivery module X.

[0121] In this embodiment, the liquid oxygen recovery module S includes a liquid oxygen collection tank S1. The liquid oxygen collection tank S1 is connected to various liquid delivery pipelines of the liquid oxygen delivery module Y via pipelines, and is used to recover liquid oxygen and the gas vaporized from the liquid oxygen in the pipelines. The liquid oxygen collection tank S1 is also connected to a low-pressure liquid oxygen storage tank filling pipeline p3 or a high-pressure liquid oxygen storage tank filling pipeline p4 via a liquid oxygen collection tank recovery pipeline s1, transporting the collected liquid oxygen to the liquid oxygen storage tank of the liquid oxygen storage module P or the liquid oxygen delivery module Y. The liquid oxygen collection tank S1 is also equipped with a liquid oxygen collection tank safety discharge pipeline s2 for gas emission. A liquid oxygen collection tank discharge bypass pipeline s3 is provided on the liquid oxygen collection tank safety discharge pipeline s2 for auxiliary discharge.

[0122] A liquid oxygen collection tank recovery valve S4 and a liquid oxygen recovery line filter S5 are sequentially installed on the liquid oxygen collection tank recovery pipeline S1.

[0123] The liquid oxygen collection tank safety discharge pipeline s2 is equipped with a liquid oxygen collection tank discharge safety valve S2 for safe discharge of liquid oxygen from the liquid oxygen collection tank.

[0124] A liquid oxygen collection tank discharge bypass valve S3 is installed on the liquid oxygen collection tank discharge bypass pipeline S3 to control the opening and closing of the bypass pipeline.

[0125] The liquid oxygen collection tank S1 is equipped with a liquid oxygen collection tank level gauge SL and a liquid oxygen collection tank pressure sensor SP.

[0126] The liquid methane recovery module U includes a liquid methane collection tank U1, which is connected to various delivery pipelines of the liquid methane delivery module X via pipelines to recover liquid methane and the gas produced by liquid methane vaporization in the pipelines. The liquid methane collection tank U1 is also connected to a low-pressure liquid methane storage tank filling pipeline r3 or a high-pressure liquid methane storage tank filling pipeline r4 via a liquid methane collection tank recovery pipeline u1, transporting the collected liquid methane to the liquid methane storage tank of the liquid methane storage module R or the liquid methane delivery module X. The liquid methane collection tank U1 is also equipped with a liquid methane collection tank safety discharge pipeline u2 for gas emission. A liquid methane collection tank discharge bypass pipeline u3 is installed on the liquid methane collection tank safety discharge pipeline u2 for auxiliary discharge.

[0127] The liquid methane collection tank recovery pipeline u1 is equipped with a liquid methane collection tank recovery valve U4 and a liquid methane recovery line filter U5 in sequence.

[0128] The liquid methane collection tank safety discharge pipeline u2 is equipped with a liquid methane collection tank discharge safety valve U2 for safe discharge of liquid methane from the liquid methane collection tank.

[0129] The liquid methane collection tank discharge bypass pipeline u3 is equipped with a liquid methane collection tank discharge bypass valve U3 to control the opening and closing of the bypass pipeline.

[0130] The liquid methane collection tank U1 is equipped with a liquid methane collection tank level gauge UL and a liquid methane collection tank pressure sensor UP.

[0131] In a specific embodiment of the present invention, the liquid oxygen delivery module Y includes a low-pressure liquid oxygen delivery module and a high-pressure liquid oxygen delivery module. The low-pressure liquid oxygen delivery module includes a low-pressure liquid oxygen storage tank O1, a low-pressure liquid oxygen main pipeline y1, and a low-pressure liquid oxygen branch pipeline y2, used to deliver low-pressure liquid oxygen for testing to the engine vehicle testing station M and the engine assembly testing station Z. The low-pressure liquid oxygen main pipeline y1 connects the low-pressure liquid oxygen storage tank O1 and the engine vehicle testing station M, providing low-pressure liquid oxygen for testing. The upstream end of the low-pressure liquid oxygen branch pipeline y2 is connected to the low-pressure liquid oxygen main pipeline y1, and the downstream end is connected to the liquid oxygen inlet on the gas generator Z2 of the engine assembly testing station Z, providing low-pressure liquid oxygen for testing. The upstream end of the low-pressure liquid oxygen main pipeline y1 is connected to the liquid oxygen collection tank S1 of the liquid oxygen recovery module S through a low-pressure liquid oxygen exhaust pipeline y6 for liquid oxygen gas recovery.

[0132] The downstream end of the low-pressure liquid oxygen branch pipeline y2 is connected to the downstream end of the low-pressure liquid oxygen exhaust pipeline y6 via the gas generator liquid oxygen low-pressure line drain pipeline y4, and then to the liquid oxygen collection tank S1 of the liquid oxygen recovery module S for liquid oxygen recovery. The downstream end of the low-pressure liquid oxygen main pipeline y1 is connected to the gas generator liquid oxygen low-pressure line drain pipeline y4 via the whole engine liquid oxygen low-pressure line drain pipeline y8, and then to the liquid oxygen collection tank S1 of the liquid oxygen recovery module S for liquid oxygen recovery.

[0133] In this embodiment, the low-pressure liquid oxygen main pipeline y1, along the conveying direction, is equipped with a low-pressure liquid oxygen storage tank outlet valve Y1 and a liquid oxygen low-pressure circuit turbine flow meter Y2 at its upstream end. Moving downstream along the conveying direction, it is sequentially equipped with a whole-engine liquid oxygen low-pressure circuit shut-off valve Y3, a whole-engine liquid oxygen low-pressure circuit bellows Y4 for eliminating stress deformation during pipeline pre-cooling, a whole-engine liquid oxygen pump inlet filter Y5, a whole-engine liquid oxygen low-pressure circuit pressure sensor YP1 for monitoring engine liquid oxygen inlet pressure, and a whole-engine liquid oxygen low-pressure circuit temperature sensor YT1 for monitoring engine liquid oxygen inlet temperature. The upstream end of the low-pressure liquid oxygen branch pipeline y2 is connected to the low-pressure liquid oxygen main pipeline y1 between the liquid oxygen low-pressure circuit turbine flow meter Y2 and the whole-engine liquid oxygen low-pressure circuit shut-off valve Y3. Along the direction of liquid oxygen flow, the low-pressure liquid oxygen branch pipeline y2 is sequentially equipped with a gas generator liquid oxygen low-pressure shut-off valve Y6, a gas generator liquid oxygen low-pressure bellows Y7 for eliminating stress deformation during pipeline pre-cooling, a gas generator liquid oxygen inlet filter Y8, a gas generator liquid oxygen low-pressure pressure sensor YP3 for monitoring the gas generator liquid oxygen inlet pressure, and a gas generator liquid oxygen low-pressure temperature sensor YT3 for monitoring the gas generator liquid oxygen inlet temperature.

[0134] Upstream of the liquid oxygen low-pressure drain line y4 of the gas generator is a liquid oxygen low-pressure drain valve Y9 for pre-cooling and draining the pipeline.

[0135] Upstream of the liquid oxygen low-pressure exhaust pipe y6, there is a liquid oxygen low-pressure exhaust valve Y10 for pre-cooling the pipe, and downstream of the liquid oxygen collection tank S1, there is a liquid oxygen collection tank inlet valve Y19 for controlling the liquid inlet.

[0136] Downstream of the liquid oxygen low-pressure drain line y8 of the engine is a liquid oxygen low-pressure drain valve Y18 for pre-cooling and draining the pipeline.

[0137] The low-pressure liquid oxygen storage tank O1 is equipped with a low-pressure liquid oxygen storage tank level gauge OL1 for detecting the liquid level.

[0138] The liquid oxygen subcooled in the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W is transported to the low-pressure liquid oxygen storage tank O1 through the liquid oxygen subcooler outlet pipe w2 and the low-pressure liquid oxygen storage tank filling pipe p3, for use during the test run.

[0139] Another method of adding liquid oxygen without supercooling it involves directly transferring the liquid oxygen in liquid oxygen storage tank P1 to low-pressure liquid oxygen storage tank O1 through low-pressure liquid oxygen storage tank filling pipeline p3, ready for use during commissioning.

[0140] The upper part of the low-pressure liquid oxygen storage tank O1 is connected to the gas distribution module D through the first pressurization module E for gas distribution and pressurization, and is depressurized through the first discharge module J. The third control device HK3 is connected to the first pressurization module E and the first discharge module J for remote control.

[0141] In this embodiment, the first pressurization module E is used to provide low-pressure gas distribution to the low-pressure liquid oxygen storage tank O1. It includes a parallel low-pressure main pressurization pipeline e1 and a low-pressure auxiliary pressurization pipeline e2. The upstream of both pipelines is connected to the gas distribution module D. The downstream of the low-pressure auxiliary pressurization pipeline e2 is connected to the low-pressure main pressurization pipeline e1. The downstream of the low-pressure main pressurization pipeline e1 is connected to the low-pressure liquid oxygen storage tank O1 for pressurization.

[0142] Along the airflow direction, the liquid oxygen low-pressure main booster pipeline e1 is equipped with a first liquid oxygen main booster solenoid valve E1, a first liquid oxygen main booster orifice plate E3, a liquid oxygen low-pressure booster filter E5, a liquid oxygen low-pressure booster manual valve E6, and a liquid oxygen low-pressure storage tank pressure sensor EP.

[0143] The liquid oxygen low-pressure auxiliary booster pipeline e2 is provided with a first liquid oxygen auxiliary booster solenoid valve E2 and a first liquid oxygen auxiliary booster orifice plate E4 arranged sequentially along the airflow direction.

[0144] The first discharge module J is used to depressurize the low-pressure liquid oxygen storage tank O1. It includes a liquid oxygen low-pressure booster discharge pipeline j1 connected to the top of the low-pressure liquid oxygen storage tank O1. A liquid oxygen low-pressure bypass exhaust pipeline j2 and a liquid oxygen low-pressure anti-stagnation pipeline j3 are connected in parallel on the liquid oxygen low-pressure booster discharge pipeline j1.

[0145] The liquid oxygen low-pressure booster discharge pipeline j1 is equipped with a first safety discharge manual valve J1, a first discharge safety valve J2 and a first exhaust silencer J6 in sequence along the venting direction.

[0146] A first bypass discharge valve J3 is installed on the liquid oxygen low-pressure bypass exhaust pipeline J2.

[0147] The liquid oxygen low-pressure anti-stagnation pipeline j3 is equipped with a first anti-stagnation manual valve J4 and a first check valve J5 in sequence along the venting direction.

[0148] The high-pressure liquid oxygen delivery module includes a high-pressure liquid oxygen storage tank O2 and a high-pressure liquid oxygen main pipeline y3, used to deliver high-pressure liquid oxygen for engine assembly test station Z. The high-pressure liquid oxygen main pipeline y3 connects the high-pressure liquid oxygen storage tank O2 and the liquid oxygen inlet of the turbopump Z1 at the engine assembly test station Z, providing high-pressure liquid oxygen for test operation. The upstream end of the high-pressure liquid oxygen main pipeline y3 is connected to the low-pressure liquid oxygen exhaust pipeline y6 via a high-pressure liquid oxygen exhaust pipeline y7, and further connected to the liquid oxygen collection tank S1 of the liquid oxygen recovery module S for liquid oxygen gas recovery.

[0149] Downstream of the high-pressure liquid oxygen main pipeline y3, the liquid oxygen high-pressure pipeline y5 is connected to the liquid oxygen low-pressure pipeline y4 of the gas generator, and then connected to the liquid oxygen collection tank S1 of the liquid oxygen recovery module S for liquid oxygen recovery.

[0150] In this embodiment, the high-pressure liquid oxygen main pipeline y3 is sequentially equipped with a high-pressure liquid oxygen tank outlet valve Y11, a liquid oxygen high-pressure line turbine flow meter Y12, a liquid oxygen high-pressure line filter Y13, a liquid oxygen high-pressure line cavitation pipe Y14 for regulating the liquid oxygen flow rate, a liquid oxygen high-pressure line pressure sensor YP2, a liquid oxygen high-pressure line temperature sensor YT2, and a turbine pump liquid oxygen inlet valve Y15 for liquid inlet control.

[0151] A liquid oxygen high-pressure drain valve Y16 is installed on the liquid oxygen high-pressure drain line y5 for pre-cooling and draining the pipeline.

[0152] The high-pressure liquid oxygen exhaust pipe Y7 is equipped with a high-pressure liquid oxygen exhaust valve Y17 for pre-cooling the pipe.

[0153] The high-pressure liquid oxygen storage tank O2 is equipped with a high-pressure liquid oxygen storage tank level gauge OL2 for detecting the liquid level.

[0154] The liquid oxygen subcooled in the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W is transported to the high-pressure liquid oxygen storage tank O2 through the liquid oxygen subcooler outlet pipe W2 and the high-pressure liquid oxygen storage tank filling pipe P4, ready for use during the test run.

[0155] Another method of adding liquid oxygen without supercooling is to directly transfer the liquid oxygen in liquid oxygen storage tank P1 to high-pressure liquid oxygen storage tank O2 through low-pressure liquid oxygen storage tank filling pipeline p3 and high-pressure liquid oxygen storage tank filling pipeline p4, so that it can be used during the test run.

[0156] The upper part of the high-pressure liquid oxygen storage tank O2 is connected to the gas distribution module D through the second pressurization module G for gas distribution and pressurization, and is depressurized through the second discharge module L. The fourth control device HK4 is connected to the second pressurization module G and the second discharge module L for remote control.

[0157] In this embodiment, the second pressurization module G is used to provide high-pressure gas distribution to the high-pressure liquid oxygen storage tank O2. It includes a parallel high-pressure main pressurization pipeline g1 and a high-pressure auxiliary pressurization pipeline g2. The upstream of both pipelines is connected to the gas distribution module D. The downstream of the high-pressure auxiliary pressurization pipeline g2 is connected to the high-pressure main pressurization pipeline g1. The downstream of the high-pressure main pressurization pipeline g1 is connected to the high-pressure liquid oxygen storage tank O2 for pressurization.

[0158] Along the airflow direction, the liquid oxygen high-pressure main booster pipeline g1 is equipped with a second liquid oxygen main booster solenoid valve G1, a second liquid oxygen main booster orifice plate G3, a liquid oxygen high-pressure booster filter G5, a liquid oxygen high-pressure booster manual valve G6, and a liquid oxygen high-pressure storage tank pressure sensor GP.

[0159] Along the airflow direction, a second liquid oxygen booster solenoid valve G2 and a second liquid oxygen booster orifice plate G4 are sequentially installed on the liquid oxygen high-pressure booster pipeline g2.

[0160] The second discharge module L depressurizes the high-pressure liquid oxygen storage tank O2. It includes a high-pressure liquid oxygen booster discharge pipeline l1 connected to the top of the high-pressure liquid oxygen storage tank O2. A high-pressure liquid oxygen bypass exhaust pipeline l2 and a high-pressure liquid oxygen anti-stagnation pipeline l3 are connected in parallel on the high-pressure liquid oxygen booster discharge pipeline l1.

[0161] The liquid oxygen high-pressure booster discharge pipeline L1 is equipped with a second safety discharge manual valve L1, a second discharge safety valve L2, and a second exhaust silencer L6 in sequence along the venting direction.

[0162] A second bypass discharge valve L3 is installed on the high-pressure bypass exhaust pipeline L2 for liquid oxygen.

[0163] The liquid oxygen high-pressure anti-backpressure pipeline l3 is equipped with a second anti-backpressure manual valve L4 and a second check valve L5 in sequence along the venting direction.

[0164] In a specific embodiment of the present invention, the liquid methane delivery module X includes a low-pressure liquid methane delivery module and a high-pressure liquid methane delivery module. The low-pressure liquid methane delivery module includes a low-pressure liquid methane storage tank O4, a low-pressure liquid methane main pipeline x1, and a low-pressure liquid methane branch pipeline x2, used to deliver low-pressure liquid methane for testing to the engine vehicle testing station M and the engine assembly testing station Z. The low-pressure liquid methane main pipeline x1 connects the low-pressure liquid methane storage tank O4 and the engine vehicle testing station M, providing low-pressure liquid methane for testing. The upstream end of the low-pressure liquid methane branch pipeline x2 is connected to the low-pressure liquid methane main pipeline x1, and the downstream end is connected to the liquid methane inlet on the gas generator Z2 of the engine assembly testing station Z, providing low-pressure liquid methane for testing. The upstream end of the low-pressure liquid methane main pipeline x1 is connected to the liquid methane collection tank U1 of the liquid methane recovery module U through the low-pressure liquid methane exhaust pipeline x6 for liquid methane gas recovery.

[0165] The downstream end of the low-pressure liquid methane branch line x2 is connected to the downstream end of the low-pressure liquid methane exhaust line x6 via the gas generator liquid methane low-pressure line drain line x4, and then to the liquid methane collection tank U1 of the liquid methane recovery module U for liquid methane recovery. The downstream end of the low-pressure liquid methane main line x1 is connected to the gas generator liquid methane low-pressure line drain line x4 via the whole engine liquid methane low-pressure line drain line x8, and then to the liquid methane collection tank U1 of the liquid methane recovery module U for liquid methane recovery.

[0166] In this embodiment, the low-pressure liquid methane main pipeline x1, along the conveying direction, is equipped with a low-pressure liquid methane storage tank outlet valve X1 and a liquid methane low-pressure circuit turbine flow meter X2 at its upstream end. Moving downstream along the conveying direction, it is sequentially equipped with a whole-engine liquid methane low-pressure circuit shut-off valve X3, a whole-engine liquid methane low-pressure circuit bellows X4 for eliminating stress deformation during pipeline pre-cooling, a whole-engine liquid methane pump inlet filter X5, a whole-engine liquid methane low-pressure circuit pressure sensor XP1 for monitoring engine liquid methane inlet pressure, and a whole-engine liquid methane low-pressure circuit temperature sensor XT1 for monitoring engine liquid methane inlet temperature. The upstream end of the low-pressure liquid methane branch pipeline x2 is connected to the low-pressure liquid methane main pipeline x1 between the liquid methane low-pressure circuit turbine flow meter X2 and the whole-engine liquid methane low-pressure circuit shut-off valve X3. Along the flow direction of liquid methane, the low-pressure liquid methane branch pipeline x2 is sequentially equipped with a gas generator liquid methane low-pressure shut-off valve X6, a gas generator liquid methane low-pressure bellows X7 for eliminating stress deformation during pipeline pre-cooling, a gas generator liquid methane inlet filter X8, a gas generator liquid methane low-pressure pressure sensor XP3 for monitoring the gas generator liquid methane inlet pressure, and a gas generator liquid methane low-pressure temperature sensor XT3 for monitoring the gas generator liquid methane inlet temperature.

[0167] Upstream of the low-pressure liquid methane drain line x4 of the gas generator is a low-pressure liquid methane drain valve x9 for pre-cooling and draining the pipeline.

[0168] Upstream of the liquid methane low-pressure exhaust pipe x6 is a liquid methane low-pressure exhaust valve X10 for pre-cooling the pipe, and downstream of the liquid methane collection tank S1 is a liquid methane collection tank inlet valve X19 for controlling the liquid inlet.

[0169] Downstream of the engine liquid methane low-pressure drain line x8, there is an engine liquid methane low-pressure drain valve X18 for pre-cooling and draining the pipeline.

[0170] The low-pressure liquid methane storage tank O4 is equipped with a low-pressure liquid methane storage tank level gauge OL4 for detecting the liquid level.

[0171] Liquid methane subcooled in the liquid methane subcooler V1 of the liquid methane subcooling module V is transported to the low-pressure liquid methane storage tank O4 through the liquid methane subcooler outlet pipeline V2 and the low-pressure liquid methane storage tank filling pipeline r3, ready for use during commissioning.

[0172] Another method of adding liquid methane without subcooling it involves directly transferring the liquid methane in the liquid methane storage tank R1 to the low-pressure liquid methane storage tank O4 through the low-pressure liquid methane storage tank filling pipeline r3, ready for use during commissioning.

[0173] The upper part of the low-pressure liquid methane storage tank O4 is connected to the gas distribution module D via the fourth pressurization module F for gas distribution and pressurization, and is depressurized via the fourth discharge module K. The sixth control device HK6 is connected to the fourth pressurization module F and the fourth discharge module K for remote control.

[0174] In this embodiment, the fourth pressurization module F is used to provide low-pressure gas distribution to the low-pressure liquid methane storage tank O4. It includes a parallel low-pressure main pressurization pipeline f1 and a low-pressure auxiliary pressurization pipeline f2 for liquid methane. The upstream of both pipelines is connected to the gas distribution module D. The downstream of the low-pressure auxiliary pressurization pipeline f2 is connected to the low-pressure main pressurization pipeline f1 for liquid methane. The downstream of the low-pressure main pressurization pipeline f1 is connected to the low-pressure liquid methane storage tank O4 for pressurization.

[0175] Along the airflow direction, the liquid methane low-pressure main booster pipeline f1 is equipped with a fourth liquid methane main booster solenoid valve F1, a fourth liquid methane main booster orifice plate F3, a liquid methane low-pressure booster filter F5, a liquid methane low-pressure booster manual valve F6, and a liquid methane low-pressure storage tank pressure sensor FP.

[0176] The liquid methane low-pressure auxiliary booster pipeline f2 is equipped with a fourth liquid methane auxiliary booster solenoid valve F2 and a fourth liquid methane auxiliary booster orifice plate F4 in sequence along the gas flow direction.

[0177] The fourth emission module K is used to depressurize the low-pressure liquid methane storage tank O4. It includes a low-pressure liquid methane booster emission pipeline k1 connected to the top of the low-pressure liquid methane storage tank O4. A low-pressure liquid methane bypass exhaust pipeline k2 and a low-pressure liquid methane anti-backflow pipeline k3 are connected in parallel to the low-pressure liquid methane booster emission pipeline k1. Among them, the low-pressure liquid methane booster emission pipeline k1 is equipped with a fourth safety emission manual valve K1, a fourth emission safety valve K2, a second methane emission flame arrester K6, and a fourth exhaust silencer K7 in sequence along the depressurization direction.

[0178] A fourth bypass discharge valve K3 is installed on the liquid methane low-pressure bypass exhaust pipeline k2.

[0179] The liquid methane low-pressure anti-backflow pipeline k3 is equipped with a fourth anti-backflow manual valve K4 and a fourth check valve K5 in sequence along the leakage direction.

[0180] The high-pressure liquid methane delivery module includes a high-pressure liquid methane storage tank O3 and a high-pressure liquid methane main pipeline x3, used to deliver high-pressure liquid methane for testing at the engine assembly test station Z. The high-pressure liquid methane main pipeline x3 connects the high-pressure liquid methane storage tank O3 and the liquid methane inlet of the turbine pump Z1 at the engine assembly test station Z, providing high-pressure liquid methane for testing. The upstream end of the high-pressure liquid methane main pipeline x3 is connected to the low-pressure liquid methane exhaust pipeline x6 via a high-pressure liquid methane exhaust pipeline x7, and further connected to the liquid methane collection tank U1 of the liquid methane recovery module U for liquid methane vaporization gas recovery.

[0181] Downstream of the high-pressure liquid methane main pipeline x3, the liquid methane high-pressure pipeline discharge pipeline x5 is connected to the liquid methane low-pressure pipeline discharge pipeline x4 of the gas generator, and then connected to the liquid methane collection tank U1 of the liquid methane recovery module U for liquid methane recovery.

[0182] In this embodiment, the high-pressure liquid methane main pipeline x3 is sequentially equipped with a high-pressure liquid methane storage tank outlet valve X11, a liquid methane high-pressure line turbine flow meter X12, a liquid methane high-pressure line filter X13, a liquid methane high-pressure line cavitation pipe X14 for regulating the liquid methane flow rate, a liquid methane high-pressure line pressure sensor XP2, a liquid methane high-pressure line temperature sensor XT2, and a turbine pump liquid methane inlet valve X15 for liquid inlet control.

[0183] A liquid methane high-pressure drain valve X16 is installed on the liquid methane high-pressure drain line x5 for pre-cooling and draining the pipeline.

[0184] The high-pressure liquid methane exhaust pipe x7 is equipped with a high-pressure liquid methane exhaust valve x17 for pre-cooling the pipe.

[0185] The high-pressure liquid methane storage tank O3 is equipped with a high-pressure liquid methane storage tank level gauge OL3 for detecting the liquid level.

[0186] Liquid methane subcooled in the liquid methane subcooler V1 of the liquid methane subcooling module V is transported to the high-pressure liquid methane storage tank O3 through the liquid methane subcooler outlet pipeline V2 and the high-pressure liquid methane storage tank filling pipeline r4, ready for use during commissioning.

[0187] Another method of adding liquid methane without subcooling it involves directly transferring the liquid methane in the liquid methane storage tank R1 to the high-pressure liquid methane storage tank O3 through the low-pressure liquid methane storage tank filling pipeline r3 and the high-pressure liquid methane storage tank filling pipeline r4, for use during commissioning.

[0188] The upper part of the high-pressure liquid methane storage tank O3 is connected to the gas distribution module D via the third pressurization module H for gas distribution and pressurization, and is depressurized via the third discharge module N. The fifth control device HK5 is connected to the third pressurization module H and the third discharge module N for remote control.

[0189] In this embodiment, the third pressurization module H is used to provide high-pressure gas distribution to the high-pressure liquid methane storage tank O3. It includes a parallel high-pressure main pressurization pipeline h1 and a high-pressure auxiliary pressurization pipeline h2 for liquid methane. The upstream of both pipelines is connected to the gas distribution module D. The downstream of the high-pressure auxiliary pressurization pipeline h2 is connected to the high-pressure main pressurization pipeline h1 for liquid methane. The downstream of the high-pressure main pressurization pipeline h1 is connected to the high-pressure liquid methane storage tank O3 for pressurization.

[0190] Along the airflow direction, the liquid methane high-pressure main booster pipeline h1 is equipped with a third liquid methane main booster solenoid valve H1, a third liquid methane main booster orifice plate H3, a liquid methane high-pressure booster filter H5, a liquid methane high-pressure booster manual valve H6, and a liquid methane high-pressure storage tank pressure sensor HP.

[0191] A third liquid methane booster solenoid valve H2 and a third liquid methane booster orifice plate H4 are sequentially installed along the gas flow direction on the high-pressure liquid methane booster pipeline h2.

[0192] The third emission module N depressurizes the high-pressure liquid methane storage tank O3. It includes a high-pressure liquid methane booster emission pipeline n1 connected to the top of the high-pressure liquid methane storage tank O3. A high-pressure liquid methane bypass exhaust pipeline n2 and a high-pressure liquid methane anti-stress pipeline n3 are connected in parallel on the high-pressure liquid methane booster emission pipeline n1.

[0193] The liquid methane high-pressure booster discharge pipeline n1 is equipped with a third safety discharge manual valve N1, a third discharge safety valve N2, a first methane discharge flame arrester N6, and a third exhaust silencer N7 in sequence along the venting direction.

[0194] A third bypass discharge valve N3 is installed on the high-pressure bypass exhaust pipe n2 for liquid methane.

[0195] The liquid methane high-pressure anti-backflow pipeline n3 is equipped with a third anti-backflow manual valve N4 and a third check valve N5 in sequence along the venting direction.

[0196] In a specific embodiment of the present invention, the engine vehicle test station M is the engine M1 undergoing low-pressure testing.

[0197] The low-pressure liquid oxygen storage tank O1 is connected to the liquid oxygen inlet of the main engine M1 via the low-pressure liquid oxygen main pipeline y1, providing low-pressure liquid oxygen for test runs.

[0198] The low-pressure liquid methane storage tank O4 is connected to the liquid methane inlet of the engine M1 via the low-pressure liquid methane main pipeline x1, providing low-pressure liquid methane for test runs.

[0199] The engine assembly test station Z includes a turbopump Z1 and a gas generator Z2.

[0200] The low-pressure liquid oxygen storage tank O1 is connected to the liquid oxygen inlet of the gas generator Z2 through the low-pressure liquid oxygen main pipeline y1 and the low-pressure liquid oxygen branch pipeline y2, providing low-pressure liquid oxygen for commissioning.

[0201] The high-pressure liquid oxygen storage tank O2 is connected to the liquid oxygen inlet of the turbine pump Z1 through the high-pressure liquid oxygen main pipeline y3, providing high-pressure liquid oxygen for the test run.

[0202] The low-pressure liquid methane storage tank O4 is connected to the liquid methane inlet of the gas generator Z2 through the low-pressure liquid methane main pipeline x1 and the low-pressure liquid methane branch pipeline x2, providing low-pressure liquid methane for commissioning.

[0203] The high-pressure liquid methane storage tank O3 is connected to the liquid methane inlet of the turbine pump Z1 via the high-pressure liquid methane main pipeline x3, providing high-pressure liquid methane for commissioning.

[0204] In a specific embodiment of the present invention, the gas generation module C includes: a liquid nitrogen storage tank C1, a liquid nitrogen plunger pump C2, a liquid nitrogen vaporizer C3, and a high-pressure nitrogen cylinder group C4. Liquid nitrogen from the first liquid nitrogen storage module A is added to the liquid nitrogen storage tank C1 via a second liquid nitrogen filling pipeline a5, then pumped into the liquid nitrogen vaporizer C3 by the liquid nitrogen plunger pump C2 for vaporization, and finally stored in the high-pressure nitrogen cylinder group C4.

[0205] High-pressure nitrogen cylinder group C4 is supplied to nitrogen distribution module D via nitrogen main pipeline c0. A high-pressure nitrogen cylinder group supply valve C5 is installed at the gas inlet of high-pressure nitrogen cylinder group C4 for controlling the gas output from the high-pressure cylinders. A high-pressure nitrogen pipeline isolation valve C6 is installed on nitrogen main pipeline c0 for isolating and cutting off high-pressure nitrogen pipelines. In this embodiment, the nitrogen source main pipeline c0 is the high-pressure nitrogen source main pipeline from high-pressure nitrogen cylinder group C4 to nitrogen distribution system D, and the source pressure is 30-35 MPa.

[0206] Furthermore, the nitrogen distribution module D includes a first distribution plate D1, a second distribution plate D2, a third distribution plate D3, and a fourth distribution plate D4 connected in parallel to the main nitrogen supply pipeline c0. The first distribution plate D1 is connected to the main nitrogen supply pipeline c0 via a first nitrogen branch pipeline c1, and is also connected to the first pressurization module E via a first pressurization pipeline d1 for pressurization supply. Additionally, the first distribution plate D1 is connected to the liquid oxygen collection tank recovery pipeline s1 via a fifth pressurization pipeline d5 for pressurizing the liquid oxygen collection tank S1. A liquid oxygen collection tank supply valve D5 is located downstream of the fifth pressurization pipeline d5.

[0207] The second gas distribution plate D2 is connected to the nitrogen delivery main pipeline c0 through the second nitrogen branch pipeline c2, and the second gas distribution plate D2 is connected to the second booster module G through the second booster gas delivery pipeline d2 for booster gas supply.

[0208] The third gas distribution plate D3 is connected to the main nitrogen supply pipeline c0 via the third nitrogen branch pipeline c3, and the third gas distribution plate D3 is connected to the third booster module H via the third booster gas supply pipeline d3 for booster gas supply.

[0209] The fourth gas distribution plate D4 is connected to the main nitrogen supply line c0 via the fourth nitrogen branch line c4, and also connects to the fourth pressurization module F via the fourth pressurization gas supply line d4 for pressurization. Additionally, the fourth gas distribution plate D4 is connected to the liquid methane collection tank recovery line u1 via the sixth pressurization gas supply line d6, used to pressurize the liquid methane collection tank U1. A liquid methane collection tank gas supply valve D6 is located downstream of the sixth pressurization gas supply line d6.

[0210] The operation procedure of the multi-functional test system of the liquid oxygen methane engine test stand is as follows:

[0211] (a) To carry out the loading or supercooling of propellants for liquid oxygen and liquid methane systems.

[0212] 1. When adding propellant or supercooling propellant to a liquid oxygen system.

[0213] The liquid oxygen storage module P is designed to withstand a pressure of 1.6 MPa. The liquid oxygen tank vent valve P13 and the third safety vent valve P14 remain normally open. The third self-operated vent valve P15 is set to a self-operated vent pressure of 1.0–1.5 MPa. When the liquid oxygen tank P1 reaches the set vent pressure, the third self-operated vent valve P15 automatically opens to vent through the liquid oxygen tank venting pipeline p5, preventing the third safety valve P16 from tripping due to overpressure and protecting its service life. The operation of the liquid oxygen storage module P is automatically controlled by the first control device HK1: the liquid oxygen filling valve P4 is opened, and liquid oxygen is filled into the liquid oxygen tank P1 by the liquid oxygen filling tank truck P2 through the liquid oxygen tank filling pipeline p1. When the liquid level reaches the maximum value set by the liquid oxygen tank level gauge PL, the liquid oxygen filling valve P4 is interlocked and closed to stop filling. Open the third self-pressurizer inlet regulating valve P5 and the third self-pressurizer outlet valve P7. Liquid oxygen is supplied to the liquid oxygen storage tank P1 via the liquid oxygen storage tank self-pressurization pipeline p2 using the third self-pressurizer P6. The third self-pressurizer inlet regulating valve P5 adjusts the inlet flow of the third self-pressurizer P6. When the liquid oxygen storage tank pressure sensor PP detects a self-pressurization pressure of 0.5 to 0.9, close the third self-pressurizer inlet regulating valve P5 and the third self-pressurizer outlet valve P7. Use the third control device HK3 to open the first bypass discharge valve J3, and use the fourth control device HK4 to open the second bypass discharge valve L3, connecting the low-pressure liquid oxygen storage tank O1 and the high-pressure liquid oxygen storage tank O2 to the atmosphere, facilitating the refilling of liquid oxygen. The first control device HK1 is used to open the liquid oxygen outlet valve P8, the liquid oxygen low-pressure storage tank inlet valve P10, and the liquid oxygen high-pressure storage tank inlet valve P12. Liquid oxygen is added to the low-pressure liquid oxygen storage tank O1 through the low-pressure liquid oxygen storage tank filling pipeline p3, and to the high-pressure liquid oxygen storage tank O2 through the high-pressure liquid oxygen storage tank filling pipeline p4.

[0214] During subcooling refueling, the first control device HK1 controls the liquid nitrogen to be refueled from the first liquid nitrogen refueling tanker A2 to the first liquid nitrogen storage tank A1 through the first liquid nitrogen storage tank refueling pipeline a1. After the storage tank is pressurized through the first self-pressurizer inlet regulating valve A5, the self-pressurizer A6, the first self-pressurizer outlet valve A7 and the first liquid nitrogen storage tank self-pressurization pipeline a2, the liquid nitrogen is supplied to the liquid oxygen subcooler W1 through the first liquid nitrogen refueling pipeline a3, the first liquid nitrogen outlet valve A8 and the liquid oxygen subcooler liquid nitrogen inlet valve A10. Simultaneously, liquid oxygen is supplied from liquid oxygen storage tank P1 through low-pressure liquid oxygen storage tank filling pipeline p3, liquid oxygen subcooler inlet pipeline w1, and liquid oxygen subcooler inlet valve W2. The subcooled temperature value is monitored by liquid oxygen subcooler outlet temperature sensor WT. The subcooled liquid oxygen is then transported from liquid oxygen subcooler W1 through liquid oxygen subcooler outlet valve W3, liquid oxygen subcooler outlet pipeline w2, low-pressure liquid oxygen storage tank filling pipeline p3, and high-pressure liquid oxygen storage tank filling pipeline p4 to low-pressure liquid oxygen storage tank O1 and high-pressure liquid oxygen storage tank O2, respectively. During the subcooling process, the liquid level value set by liquid oxygen subcooler level sensor WL is monitored. If the liquid level value of liquid oxygen subcooler level sensor WL exceeds the liquid level value, the liquid nitrogen filling of liquid oxygen subcooler liquid nitrogen inlet valve A10 is interlocked and closed.

[0215] During refueling or subcooling refueling, the first control device HK1 monitors the process. When the liquid oxygen level gauges OL1 and OL2 of the low-pressure liquid oxygen storage tank reach the set maximum liquid level, the liquid oxygen outlet valve P8, the liquid oxygen inlet valve P10 of the low-pressure liquid oxygen storage tank, and the liquid oxygen inlet valve P12 of the high-pressure liquid oxygen storage tank are closed to refuel the liquid oxygen. The liquid nitrogen supply is also closed to the first liquid nitrogen outlet valve A8 and the liquid nitrogen inlet valve A10 of the liquid oxygen subcooler. After the liquid oxygen refueling or subcooling refueling is completed, the first bypass discharge valve J3 and the second bypass discharge valve L3 are closed.

[0216] 2. When adding or supercooling propellant to a liquid methane system.

[0217] The liquid methane storage module R is designed to a pressure of 1.6 MPa. The liquid methane storage tank vent valve R13 and the fourth safety vent valve R14 remain normally open. The fourth self-operated vent valve R15 is set to a self-operated vent pressure of 1.0–1.5 MPa. When the liquid methane storage tank R1 reaches the set vent pressure, the fourth self-operated vent valve R15 automatically opens to vent through the liquid methane storage tank venting pipeline r5, preventing the fourth safety valve R16 from overpressure tripping and protecting its service life. The operation of the liquid methane storage module R is automatically controlled by the second control device HK2: the liquid methane filling valve R4 is opened, and liquid methane is filled into the liquid methane storage tank R1 by the liquid methane filling tank truck R2 through the liquid methane storage tank filling pipeline r1. When the liquid level reaches the maximum value set by the liquid methane storage tank level gauge RL, the liquid methane filling valve R4 is interlocked and closed to stop filling. Open the fourth self-pressurizer inlet regulating valve R5 and the fourth self-pressurizer outlet valve R7. Liquid methane is supplied to the liquid methane storage tank R1 via the liquid methane storage tank self-pressurization pipeline r2 using the third self-pressurizer R6. The fourth self-pressurizer inlet regulating valve R5 adjusts the inlet flow of the third self-pressurizer R6. When the liquid methane storage tank pressure sensor RP detects a self-pressurization pressure of 0.5–0.9, close the fourth self-pressurizer inlet regulating valve R5 and the fourth self-pressurizer outlet valve R7. Use the fifth control device HK5 to open the third bypass discharge valve N3, and use the sixth control device HK6 to open the fourth bypass discharge valve K3, connecting the high-pressure liquid methane storage tank O3 and the low-pressure liquid methane storage tank O4 to the atmosphere to facilitate the filling of liquid methane. The second control device HK2 is used to open the liquid methane outlet valve R8, the liquid methane low-pressure storage tank inlet valve R10, and the liquid methane high-pressure storage tank inlet valve R12. Liquid methane is then added to the low-pressure liquid methane storage tank O4 through the low-pressure liquid methane storage tank filling pipeline r3, and to the high-pressure liquid methane storage tank O3 through the high-pressure liquid methane storage tank filling pipeline r4.

[0218] During subcooling refueling, the second control device HK2 controls the refueling of liquid nitrogen from the second liquid nitrogen refueling tanker B2 and the second liquid nitrogen storage tank refueling pipeline b1 to the second liquid nitrogen storage tank B1. After the storage tank is pressurized by the second self-pressurizer inlet regulating valve B5, the second self-pressurizer B6, the second self-pressurizer outlet valve B7, and the second liquid nitrogen storage tank self-pressurization pipeline b2, liquid nitrogen is supplied to the liquid methane subcooler V1 by the third liquid nitrogen refueling pipeline b3, the second liquid nitrogen outlet valve B8, and the liquid methane subcooler liquid nitrogen inlet valve B10. Simultaneously, liquid methane is supplied from the second liquid nitrogen storage tank B1 through the low-pressure liquid methane storage tank filling pipeline r3, the liquid methane subcooler inlet pipeline v1, and the liquid methane subcooler V1. The subcooled temperature value is monitored by the liquid methane subcooler outlet temperature sensor VT. The subcooled liquid methane is transported from the liquid methane subcooler V1 through the liquid methane subcooler outlet valve V3, the liquid methane subcooler outlet pipeline v2, the low-pressure liquid methane storage tank filling pipeline r3, and the high-pressure liquid methane storage tank filling pipeline r4 to the high-pressure liquid methane storage tank O3 and the low-pressure liquid methane storage tank O4. During the subcooling process, the liquid level value set by the liquid methane subcooler level sensor VL is monitored. If the liquid methane subcooler level sensor VL exceeds the liquid level value, the liquid nitrogen filling of the liquid methane subcooler liquid nitrogen inlet valve B10 is interlocked and closed.

[0219] When adding or subcooling liquid methane, when the liquid level gauges OL3 and OL4 of the high-pressure liquid methane storage tank reach the set maximum liquid level, the liquid methane outlet valve R8, the liquid methane inlet valve R10 of the low-pressure liquid methane storage tank, and the liquid methane inlet valve R12 of the high-pressure liquid methane storage tank are closed to allow liquid methane to be added. The liquid nitrogen supply is also closed by closing the second liquid nitrogen outlet valve B8 and the liquid nitrogen inlet valve B10 of the liquid methane subcooler. After the liquid methane addition or subcooling addition is completed, the fourth bypass discharge valve K3 and the third bypass discharge valve N3 are closed.

[0220] (ii) To produce gas using a liquid nitrogen gas production system and to distribute gas using a nitrogen gas distribution system.

[0221] The gas generation module C is activated. Liquid nitrogen is supplied from the liquid nitrogen storage tank C1, and the nitrogen gas produced after passing through the liquid nitrogen plunger pump C2 and the liquid nitrogen vaporizer C3 is stored in the high-pressure nitrogen cylinder group C4. When the liquid nitrogen in the liquid nitrogen storage tank C1 is insufficient, the first liquid nitrogen storage module A1 delivers liquid nitrogen to the liquid nitrogen storage tank C1 through the first liquid nitrogen filling pipeline a3, the gas generation storage tank liquid delivery valve A15, and the second liquid nitrogen filling pipeline a5. The high-pressure nitrogen pipeline isolation valve C6 remains normally open. The third control device HK3 controls the opening of the high-pressure nitrogen cylinder group gas delivery valve C5, and the high-pressure nitrogen is delivered to the nitrogen distribution module D through the nitrogen delivery main pipeline c0. The high-pressure nitrogen is then delivered from the nitrogen delivery main pipeline c0 and the first nitrogen branch pipeline c1 to the first gas distribution plate D1 to distribute the liquid oxygen low-pressure system. The first gas distribution plate D1 is equipped with a pressure reducing valve. Based on the pressurization requirements of the liquid oxygen low-pressure test system, the gas distribution pressure is set to 4–5 MPa after pressure reduction via the first gas distribution plate D1. The fourth control device HK4 controls the delivery of high-pressure nitrogen from the main nitrogen supply line c0 and the second nitrogen branch line c2 to the second gas distribution plate D2 for gas distribution in the liquid oxygen high-pressure system. The second gas distribution plate D2 is also equipped with a pressure reducing valve. Based on the pressurization requirements of the liquid oxygen high-pressure test system, the gas distribution pressure is set to 21–23 MPa after pressure reduction via the second gas distribution plate D2. The fifth control device HK5 controls the delivery of high-pressure nitrogen from the main nitrogen supply line c0 and the third nitrogen branch line c3 to the third gas distribution plate D3 for gas distribution in the liquid methane high-pressure system. The third gas distribution plate D3 is equipped with a pressure reducing valve. Based on the pressurization requirements of the liquid methane high-pressure test system, the gas distribution pressure is set to 21–23 MPa after pressure reduction via the third gas distribution plate D3. The system is controlled by a sixth control device, HK6. High-pressure nitrogen is delivered from the main nitrogen supply line c0 and the fourth nitrogen branch line c4 to the fourth gas distribution plate D4 for gas distribution in the liquid methane low-pressure system. The fourth gas distribution plate D4 is equipped with a pressure reducing valve. According to the pressurization requirements of the liquid methane low-pressure test system, the gas distribution pressure after pressure reduction on the fourth gas distribution plate D4 is set to 4-5 MPa.

[0222] (iii) Conduct nitrogen pressurization tests on the liquid oxygen methane low-pressure system, liquid oxygen methane high-pressure system, and liquid oxygen methane high-low system, as well as engine tests through the pressurization delivery system.

[0223] 1. When conducting the whole engine M1 test of the liquid oxygen methane low-pressure system.

[0224] (1) First, pre-cool the medium in the pipeline of the liquid oxygen methane low-pressure booster delivery system.

[0225] Low-pressure liquid oxygen delivery module: The first safety discharge manual valve J1 remains normally open. Automatic pre-cooling is controlled by the third control device HK3. The low-pressure liquid oxygen shut-off valve Y6 of the gas generator is closed. First, the low-pressure liquid oxygen storage tank outlet valve Y1 and the engine liquid oxygen low-pressure shut-off valve Y3 are opened. Liquid oxygen is transported from the low-pressure liquid oxygen storage tank O1 through the low-pressure liquid oxygen main pipeline y1 to the oxygen inlet of the engine M1 for pipeline pre-cooling. The liquid oxygen collection tank inlet valve Y19 is normally open. Then, the low-pressure liquid oxygen exhaust valve Y10 is opened to pre-cool and release the gas generated by vaporization heat exchange during the initial pre-cooling of the low-pressure liquid oxygen main pipeline y1. The exhaust gas is transported to the liquid oxygen collection tank S1 through the low-pressure liquid oxygen exhaust pipeline y6. When the temperature sensor YT1 of the liquid oxygen low-pressure circuit of the whole engine shows that the oxygen inlet temperature is 91K~94K, the pre-cooling of the medium in the low-pressure liquid oxygen main circuit y1 pipeline basically meets the requirements, and the liquid oxygen low-pressure circuit exhaust valve Y10 is closed to stop exhaust.

[0226] Low-pressure liquid methane delivery module: The fourth safety discharge manual valve K1 remains normally open, and automatic pre-cooling is achieved using the sixth control device HK6. The low-pressure liquid methane shut-off valve X6 of the gas generator is closed. First, the low-pressure liquid methane storage tank outlet valve X1 and the engine liquid methane low-pressure shut-off valve X3 are opened. Liquid methane medium is transported from the low-pressure liquid methane storage tank O4 through the low-pressure liquid methane main pipeline x1 to the methane inlet of the engine M1 for pipeline pre-cooling. The liquid methane collection tank inlet valve X19 is normally open. Then, the low-pressure liquid methane exhaust valve X10 is opened to pre-cool and release the gas generated by vaporization heat exchange when the low-pressure liquid methane main pipeline x1 begins pre-cooling. The exhaust gas is transported to the liquid methane collection tank U1 through the low-pressure liquid methane exhaust pipeline x6. When the temperature sensor XT1 of the liquid methane low-pressure circuit of the whole engine shows that the temperature of the methane inlet is 111K~114K, the pre-cooling of the medium in the low-pressure liquid methane main circuit x1 pipe is basically in line with the requirements, and the liquid methane low-pressure circuit exhaust valve X10 is closed to stop the exhaust.

[0227] (2) Then pressurize the liquid oxygen methane low-pressure system tank with nitrogen.

[0228] Low-pressure liquid oxygen storage tank: The liquid oxygen low-pressure boosting manual valve E6 remains normally open. The liquid oxygen low-pressure anti-backpressure pipeline J3 is closed. The gas supply valve in the first gas distribution plate D1 is opened to deliver pressurized nitrogen to the first liquid oxygen main boosting solenoid valve E1 and the first liquid oxygen auxiliary boosting solenoid valve E2. The third control device HK3 is used for automatic pressurization control. The first liquid oxygen main boosting solenoid valve E1 is opened. The pressurized nitrogen after gas distribution is delivered from the first gas distribution plate D1 through the first boosting gas supply pipeline d1 and the liquid oxygen low-pressure main boosting pipeline e1 to the low-pressure liquid oxygen storage tank O1 for rapid pressurization at a high flow rate. When the liquid oxygen low-pressure storage tank pressure sensor EP reaches the stable pressure value required for the test, the pressure is maintained in a stable state.

[0229] Low-pressure liquid methane storage tank: The low-pressure booster valve F6 for liquid methane in the storage tank remains normally open. The fourth bypass discharge valve K3 is closed, and the gas supply valve in the fourth gas distribution plate D4 is opened to deliver pressurized nitrogen to the fourth liquid methane main booster solenoid valve F1 and the fourth liquid methane auxiliary booster solenoid valve F2. Automatic pressurization is controlled by the sixth control device HK6. The fourth liquid methane main booster solenoid valve F1 is opened, and the pressurized nitrogen after gas distribution is delivered from the fourth gas distribution plate D4 through the fourth booster gas supply line d4 and the liquid methane low-pressure main booster line f1 to the low-pressure liquid methane storage tank O4 for rapid high-flow-rate nitrogen boosting. Once the pressure sensor FP of the low-pressure liquid methane storage tank reaches the stable pressure value required for the test, the pressure is maintained at a stable state.

[0230] (3) Finally, an ignition test was conducted to pressurize and deliver the liquid oxygen-methane low-pressure system medium to the engine.

[0231] Once the nitrogen pressurization pressure values ​​of the low-pressure liquid oxygen storage tank O1 and the low-pressure liquid methane storage tank O4 reach the test set values, the automatic timing sequence of the engine ignition test is initiated. Liquid oxygen and liquid methane are conveyed through pressurization and compression, simultaneously delivered to the main engine M1 via the low-pressure liquid oxygen main line y1 and the low-pressure liquid methane main line x1 for the ignition test. During the ignition test, the liquid levels of the low-pressure liquid oxygen storage tank O1 and the low-pressure liquid methane storage tank O4 are simultaneously monitored via the low-pressure liquid oxygen storage tank level gauge OL1 and the low-pressure liquid methane storage tank level gauge OL4.

[0232] When the test conditions need to be changed during the ignition test and the nitrogen boost pressure needs to be increased rapidly, if the boost pressure of the liquid oxygen low-pressure main booster line e1 is insufficient to meet the boost capacity, the first liquid oxygen auxiliary booster solenoid valve E2 is opened, using both the liquid oxygen low-pressure main booster line e1 and the liquid oxygen low-pressure auxiliary booster line e2 for simultaneous boosting. If the boost pressure of the liquid methane low-pressure main booster line f1 is insufficient to meet the boost capacity, the fourth liquid methane auxiliary booster solenoid valve F2 is opened, using both the liquid methane low-pressure main booster line f1 and the liquid methane low-pressure auxiliary booster line f2 for simultaneous boosting.

[0233] When the ignition test of the engine M1 is completed, the liquid oxygen low-pressure system: the third control device HK3 opens the liquid oxygen low-pressure anti-backpressure pipeline J3 to release gas from the low-pressure liquid oxygen storage tank O1, and opens the liquid oxygen low-pressure circuit drain valve Y18 of the engine to drain the liquid oxygen main pipeline y1. The drained medium is discharged into the liquid oxygen collection tank S1 through the liquid oxygen low-pressure circuit drain pipeline y8 of the engine, the liquid oxygen low-pressure circuit drain pipeline y4 of the gas generator, and the liquid oxygen low-pressure circuit exhaust pipeline y6. When the venting and drainage reach the point where the pressure sensor EP of the liquid oxygen low-pressure storage tank and the pressure sensor YP1 of the engine liquid oxygen low-pressure circuit are within a reasonable range, the first bypass discharge valve J3 and the liquid oxygen low-pressure circuit drain valve Y18 of the engine are closed, and the first anti-backpressure hand valve J4 is manually opened to prevent the residual medium in the low-pressure liquid oxygen storage tank O1 from evaporating and causing backpressure.

[0234] Liquid methane low-pressure system: The sixth control device HK6 opens the fourth bypass vent valve K3 to vent the low-pressure liquid methane storage tank O4, and opens the engine liquid methane low-pressure circuit drain valve X18 to drain the low-pressure liquid methane main line x1. The drained medium is discharged from the engine liquid methane low-pressure circuit drain line x8, the gas generator liquid methane low-pressure circuit drain line x4, and the liquid methane low-pressure circuit exhaust line x6 into the liquid methane collection tank U1. When the vented liquid reaches a reasonable range as indicated by the liquid methane low-pressure storage tank pressure sensor FP and the engine liquid methane low-pressure circuit pressure sensor XP1, the fourth bypass vent valve K3 and the engine liquid methane low-pressure circuit drain valve X18 are closed. The fourth anti-backpressure valve K4 is manually opened to prevent backpressure caused by the evaporation of residual medium in the low-pressure liquid methane storage tank O4.

[0235] (4) To recycle and reuse the emission media of the liquid oxygen emission collection system and the liquid methane emission collection system.

[0236] Liquid oxygen recovery from the liquid oxygen collection tank: Close the liquid oxygen collection tank discharge bypass valve S3 and open the liquid oxygen collection tank gas supply valve D5. Pressurized nitrogen is supplied to the liquid oxygen collection tank S1 via the first gas distribution plate D1 and the fifth pressurized gas supply pipeline d5. Once the liquid oxygen collection tank S1 is pressurized to the value of the liquid oxygen collection tank pressure sensor SP, close the liquid oxygen collection tank gas supply valve D5. The first control device HK1 opens the liquid oxygen collection tank recovery valve S4, the liquid oxygen low-pressure storage tank inlet valve P10, or the liquid oxygen high-pressure storage tank inlet valve P12. The liquid oxygen in the liquid oxygen collection tank S1 is pressurized and compressed, and then recovered and transported through the liquid oxygen collection tank recovery pipeline S1, through the liquid oxygen collection tank recovery valve S4, the liquid oxygen recovery path filter S5, and the liquid oxygen low-pressure storage tank inlet valve P10 or the liquid oxygen high-pressure storage tank inlet valve P12 to the low-pressure liquid oxygen storage tank O1 and the high-pressure liquid oxygen storage tank O2. When the liquid oxygen collection tank level gauge SL shows no liquid level, after the recovery is complete, close the liquid oxygen collection tank recovery valve S4, the liquid oxygen low-pressure storage tank inlet valve P10 or the liquid oxygen high-pressure storage tank inlet valve P12, and then open the liquid oxygen collection tank discharge bypass valve S3 to prevent the residual medium in the liquid oxygen collection tank S1 from evaporating and causing pressure buildup.

[0237] Liquid oxygen recovery from the liquid methane collection tank: Close the liquid methane collection tank discharge bypass valve U3 and open the liquid methane collection tank gas supply valve D6. Pressurized nitrogen gas is supplied to the liquid methane collection tank U1 via the fourth gas distribution plate D4 and the sixth pressurized gas supply pipeline d6. Once the liquid methane collection tank U1 is pressurized to the UP value, close the liquid methane collection tank gas supply valve D6. The second control device HK2 opens the liquid methane collection tank recovery valve U4, the liquid methane low-pressure storage tank inlet valve R10, or the liquid methane high-pressure storage tank inlet valve R12. The liquid methane in the liquid methane collection tank U1 is pressurized and compressed, and then recovered and transported through the liquid methane collection tank recovery pipeline u1, the liquid methane collection tank recovery valve U4, the liquid methane recovery path filter U5, and the liquid methane low-pressure storage tank inlet valve R10 or the liquid methane high-pressure storage tank inlet valve R12 to the low-pressure liquid methane storage tank O4 or the high-pressure liquid methane storage tank O3. When the liquid level gauge UL of the liquid methane collection tank shows no liquid level, after the recovery is complete, close the liquid methane collection tank recovery valve U4, the liquid methane low-pressure storage tank inlet valve R10 or the liquid methane high-pressure storage tank inlet valve R12, and then open the liquid methane collection tank discharge bypass valve U3 to prevent the residual medium in the liquid methane collection tank U1 from evaporating and causing pressure buildup.

[0238] 2. When conducting individual gas generator component tests on a liquid oxygen methane high-pressure system.

[0239] (1) First, pre-cool the medium in the pipeline of the liquid oxygen methane high-pressure booster delivery system.

[0240] High-pressure liquid oxygen delivery module: The second safety discharge hand valve L1 remains open. The fourth control device HK4 is used for automatic pre-cooling control. The liquid oxygen high-pressure line drain valve Y16 is closed. First, the high-pressure liquid oxygen storage tank outlet valve Y11 and the turbine pump liquid oxygen inlet valve Y15 are opened. The liquid oxygen medium is transported from the high-pressure liquid oxygen storage tank O2 through the high-pressure liquid oxygen main pipeline y3 to the oxygen inlet of the individual gas generator Z2 at the engine assembly test station Z for pipeline pre-cooling. The liquid oxygen collection tank inlet valve Y19 is open. Then, the liquid oxygen high-pressure line exhaust valve Y17 is opened to pre-cool and release the gas generated by the vaporization heat exchange when the high-pressure liquid oxygen main pipeline y3 begins to pre-cool. The exhaust gas is transported to S1 through the liquid oxygen high-pressure line exhaust pipeline y7 and the liquid oxygen low-pressure line exhaust pipeline y6. When the temperature sensor YT2 of the high-pressure liquid oxygen circuit shows that the oxygen inlet temperature is 91K~94K, the pre-cooling of the medium in the high-pressure liquid oxygen main pipeline y3 basically meets the requirements, and the liquid oxygen high-pressure circuit exhaust valve Y17 is closed to stop the exhaust.

[0241] High-pressure liquid methane delivery module: The third safety discharge manual valve N1 remains open. The fifth control device HK5 is used for automatic pre-cooling control. The high-pressure liquid methane drain valve X16 is closed. First, the high-pressure liquid methane storage tank outlet valve X11 and the turbine pump liquid methane inlet valve X15 are opened. The liquid methane medium is transported from the high-pressure liquid methane storage tank O3 to the methane inlet of the Z-position individual gas generator assembly through the high-pressure liquid methane main pipeline x3 for pipeline pre-cooling. The liquid methane collection tank inlet valve X19 is open. Then, the liquid oxygen high-pressure exhaust valve X17 is opened to pre-cool and release the gas generated by the vaporization heat exchange when the high-pressure liquid methane main pipeline x3 begins to pre-cool. The exhaust gas is transported to the liquid methane collection tank U1 through the high-pressure liquid methane exhaust pipeline x7 and the low-pressure liquid methane exhaust pipeline x6. When the temperature sensor XT2 of the liquid methane high-pressure circuit shows that the temperature of the methane inlet is 111K~114K, the pre-cooling of the medium in the low-pressure liquid methane main pipeline x1 basically meets the requirements, and the exhaust valve X17 of the liquid oxygen high-pressure circuit is closed to stop the exhaust.

[0242] (2) Then pressurize the liquid oxygen methane high-pressure system tank with nitrogen.

[0243] High-pressure liquid oxygen storage tank: The liquid oxygen high-pressure booster manual valve G6 remains normally open. The second bypass discharge valve L3 is closed, and the gas supply valve in the second gas distribution plate D2 is opened to deliver pressurized nitrogen to the front of the second liquid oxygen main booster solenoid valve G1 and the second liquid oxygen auxiliary booster solenoid valve G2. The fourth control device HK4 is used for automatic control of the booster. The second liquid oxygen main booster solenoid valve G1 is opened, and the pressurized nitrogen after gas distribution is rapidly boosted by a large flow of nitrogen to the high-pressure liquid oxygen storage tank O2 through the second gas distribution plate D2. When the pressure sensor GP of the high-pressure liquid oxygen storage tank reaches the stable pressure value required for the test, the pressure is kept stable.

[0244] High-pressure liquid methane storage tank: The high-pressure booster valve H6 for liquid methane remains normally open. The third bypass discharge valve N3 is closed, and the gas supply valve in the third gas distribution plate D3 is opened to deliver booster nitrogen to the front of the third liquid methane main booster solenoid valve H1 and the third liquid methane auxiliary booster solenoid valve H2. The fifth control device HK5 is used for automatic control of the booster. The third liquid methane main booster solenoid valve H1 is opened, and the booster nitrogen after gas distribution is delivered from the third gas distribution plate D3 through the third booster gas supply pipeline d3 and the liquid methane high-pressure main booster pipeline h1 to the high-pressure liquid methane storage tank O3 for rapid booster nitrogen pressurization at a large flow rate. When the pressure sensor HP of the high-pressure liquid methane storage tank reaches the stable pressure value required for the test, the pressure is kept stable.

[0245] (3) Finally, an ignition test was conducted on the liquid oxygen methane high-pressure system medium pressurization and delivery to the individual gas generator assembly.

[0246] When the nitrogen pressurization pressure in the high-pressure liquid methane storage tank O3 reaches the set value, the automatic timing sequence for the ignition test of the individual gas generator assembly is initiated. Liquid oxygen and liquid methane are conveyed through pressurization and compression, simultaneously delivered to the individual gas generator assembly for ignition testing via Y3 and the high-pressure liquid methane main pipeline X3, respectively. During the ignition test, the liquid level values ​​of the high-pressure liquid oxygen storage tank O2 and the high-pressure liquid methane storage tank O3 are monitored.

[0247] When the test conditions need to be changed during the ignition test and the nitrogen boost pressure needs to be increased rapidly, if the boost pressure of the liquid oxygen high-pressure main booster line g1 is insufficient to meet the boost capacity, the second liquid oxygen auxiliary booster solenoid valve G2 is opened, using both the liquid oxygen high-pressure main booster line g1 and the liquid oxygen high-pressure auxiliary booster line g2 for simultaneous boosting. If the boost pressure of the liquid methane high-pressure main booster line h1 is insufficient to meet the boost capacity, the third liquid methane auxiliary booster solenoid valve H2 is opened, using both the liquid methane high-pressure main booster line h1 and the liquid methane high-pressure auxiliary booster line h2 for simultaneous boosting.

[0248] When the individual gas generator assembly ignition test is completed, the liquid oxygen high-pressure system: the fourth control device HK4 opens the second bypass discharge valve L3 to release gas from the high-pressure liquid oxygen storage tank O2, and opens the liquid oxygen high-pressure line drain valve Y16 to drain liquid from the high-pressure liquid oxygen main line y3. The drained medium is discharged into the liquid oxygen collection tank S1 through the liquid oxygen high-pressure line drain line y5, the gas generator liquid oxygen low-pressure line drain line y4, and the liquid oxygen low-pressure line exhaust line y6. When the venting and drainage reach the point where the liquid oxygen high-pressure storage tank pressure sensor GP and the liquid oxygen high-pressure line pressure sensor YP2 display reasonable values, the second bypass discharge valve L3 and the liquid oxygen high-pressure line drain valve Y16 are closed, and the second anti-backpressure valve L4 is manually opened to prevent backpressure caused by the evaporation of residual medium in the high-pressure liquid oxygen storage tank O2. Liquid methane high-pressure system: The fifth control device HK5 opens the third bypass vent valve N3 to release gas from the high-pressure liquid methane storage tank O3, and opens the liquid methane high-pressure line drain valve X16 to drain liquid from the high-pressure liquid methane main line x3. The drained medium is discharged into the liquid methane collection tank U1 through the liquid methane high-pressure line drain line x5, the gas generator liquid methane low-pressure line drain line x4, and the liquid methane low-pressure line exhaust line x6. When the venting and drainage continue until the pressure sensors HP and XP2 of the liquid methane high-pressure storage tank and the liquid methane high-pressure line are within a reasonable range, the third bypass vent valve N3 and the liquid methane high-pressure line drain valve X16 are closed, and the third anti-backpressure valve N4 is manually opened to prevent backpressure caused by the evaporation of residual medium in the high-pressure liquid methane storage tank O3.

[0249] (4) To recycle and reuse the emission media of the liquid oxygen emission collection system and the liquid methane emission collection system.

[0250] Liquid oxygen recovery from the liquid oxygen collection tank: Close the liquid oxygen collection tank discharge bypass valve S3 and open the liquid oxygen collection tank gas supply valve D5. Pressurized nitrogen is supplied to the liquid oxygen collection tank S1 via the first gas distribution plate D1 and the fifth pressurized gas supply pipeline d5. Once the liquid oxygen collection tank S1 has been pressurized to the set value, the liquid oxygen collection tank gas supply valve D5 is closed. The first control device HK1 opens the liquid oxygen collection tank recovery valve S4, the liquid oxygen low-pressure storage tank inlet valve P10, or the liquid oxygen high-pressure storage tank inlet valve P12. The liquid oxygen in the liquid oxygen collection tank S1 is pressurized and compressed, and then transported through the liquid oxygen collection tank recovery pipeline S1 to the low-pressure liquid oxygen storage tank O1 or the high-pressure liquid oxygen storage tank O2. When the liquid oxygen collection tank level gauge SL shows no liquid level, after the recovery is complete, close the liquid oxygen collection tank recovery valve S4, the liquid oxygen low-pressure storage tank inlet valve P10 or the liquid oxygen high-pressure storage tank inlet valve P12, and then open the liquid oxygen collection tank discharge bypass valve S3 to prevent the residual medium in the liquid oxygen collection tank S1 from evaporating and causing pressure buildup.

[0251] Liquid oxygen recovery from the liquid methane collection tank: Close the liquid methane collection tank discharge bypass valve U3 and open the liquid methane collection tank gas supply valve D6. Pressurized nitrogen gas is supplied to the liquid methane collection tank U1 via the fourth gas distribution plate D4 and the sixth pressurized gas supply pipeline d6. Once the liquid methane collection tank U1 is pressurized to the set value, close the liquid methane collection tank gas supply valve D6. The second control device HK2 opens the liquid methane collection tank recovery valve U4, the liquid methane low-pressure storage tank inlet valve R10, or the liquid methane high-pressure storage tank inlet valve R12. The liquid methane in the liquid methane collection tank U1 is pressurized and compressed, and then transported through the liquid methane collection tank recovery pipeline u1 to the low-pressure liquid methane storage tank O4 or the high-pressure liquid methane storage tank O3. When the liquid level gauge UL of the liquid methane collection tank shows no liquid level, after the recovery is complete, close the liquid methane collection tank recovery valve U4, the liquid methane low-pressure storage tank inlet valve R10 or the liquid methane high-pressure storage tank inlet valve R12, and then open the liquid methane collection tank discharge bypass valve U3 to prevent the residual medium in the liquid methane collection tank U1 from evaporating and causing pressure buildup.

[0252] 3. When conducting tests on the turbopump and gas generator components of a liquid oxygen-methane high / low system.

[0253] (1) First, pre-cool the medium in the pipeline of the pressurization and delivery system of the liquid oxygen methane high and low system.

[0254] High-pressure liquid oxygen delivery module: The second safety discharge manual valve L1 remains normally open. Automatic pre-cooling is controlled by the fourth control device HK4. The high-pressure liquid oxygen drain valve Y16 is closed. First, the high-pressure liquid oxygen storage tank outlet valve Y11 and the turbine pump liquid oxygen inlet valve Y15 are opened. Liquid oxygen is transported from the high-pressure liquid oxygen storage tank O2 through the high-pressure liquid oxygen main pipeline y3 to the oxygen inlet of the turbine pump Z1 for pipeline pre-cooling. The liquid oxygen collection tank inlet valve Y19 is normally open. Then, the high-pressure liquid oxygen exhaust valve Y17 is opened to pre-cool and release the gas generated by vaporization heat exchange during the initial pre-cooling of the high-pressure liquid oxygen main pipeline y3. The exhaust gas is transported to the liquid oxygen collection tank S1 through the high-pressure liquid oxygen exhaust pipeline y7 and the low-pressure liquid oxygen exhaust pipeline y6. When the high-pressure liquid oxygen temperature sensor YT2 displays an oxygen inlet temperature of 91K~94K, the pre-cooling of the medium in the high-pressure liquid oxygen main pipeline y3 is basically met. The high-pressure liquid oxygen exhaust valve Y17 is then closed to stop venting.

[0255] Low-pressure liquid oxygen delivery module: The first safety discharge manual valve J1 remains normally open. Automatic pre-cooling is controlled by the third control device HK3. The engine's low-pressure liquid oxygen shut-off valve Y3 is closed. First, the low-pressure liquid oxygen storage tank outlet valve Y1 and the gas generator's low-pressure liquid oxygen shut-off valve Y6 are opened. Liquid oxygen medium is transported from O1 through the low-pressure liquid oxygen main pipeline y1 and the low-pressure liquid oxygen branch pipeline y2 to the oxygen inlet of the Z2 gas generator for pre-cooling. The liquid oxygen collection tank inlet valve Y19 is normally open. Then, the low-pressure liquid oxygen exhaust valve Y10 is opened to pre-cool and release the gas generated by vaporization heat exchange during the initial pre-cooling of the low-pressure liquid oxygen main pipeline y1 and the low-pressure liquid oxygen branch pipeline y2. The exhaust gas is transported to the liquid oxygen collection tank S1 through the low-pressure liquid oxygen exhaust pipeline y6. When the temperature sensor YT3 of the low-pressure liquid oxygen circuit of the gas generator shows that the oxygen inlet temperature is 91K~94K, the pre-cooling of the medium in the low-pressure liquid oxygen main pipeline y1 and the low-pressure liquid oxygen branch pipeline y2 basically meets the requirements, and the liquid oxygen low-pressure circuit exhaust valve Y10 is closed to stop the exhaust.

[0256] High-pressure liquid methane delivery module: The third safety discharge manual valve N1 remains open. The fifth control device HK5 is used for automatic pre-cooling control. The high-pressure liquid methane discharge valve X16 is closed. First, the high-pressure liquid methane storage tank outlet valve X11 and the turbine pump liquid methane inlet valve X15 are opened. The liquid methane medium is transported from the high-pressure liquid methane storage tank O3 to the methane inlet of the turbine pump Z1 through the high-pressure liquid methane main pipeline x3 for pipeline pre-cooling. The liquid methane collection tank inlet valve X19 is open. Then, the high-pressure liquid methane exhaust valve X17 is opened to pre-cool and release the gas generated by the vaporization heat exchange when the high-pressure liquid methane main pipeline x3 starts to pre-cool. The exhaust gas is transported to the liquid methane collection tank U1 through the high-pressure liquid methane exhaust pipeline x7 and the low-pressure liquid methane exhaust pipeline x6. When the temperature sensor XT2 of the liquid methane high-pressure circuit shows that the temperature of the methane inlet is 111K~114K, the pre-cooling of the medium in the low-pressure liquid methane main circuit x1 is basically in line with the requirements, and the exhaust valve X17 of the liquid oxygen high-pressure circuit is closed to stop the exhaust.

[0257] Low-pressure liquid methane delivery module: The fourth safety discharge manual valve K1 remains normally open. Automatic pre-cooling is controlled by the sixth control device HK6. The engine liquid methane low-pressure circuit shut-off valve X3 is closed. First, the low-pressure liquid methane storage tank outlet valve X1 and the gas generator liquid methane low-pressure circuit shut-off valve X6 are opened. Liquid methane medium is transported from the low-pressure liquid methane storage tank O4 through the low-pressure liquid methane main pipeline x1 and the low-pressure liquid methane branch pipeline x2 to the methane inlet of the gas generator Z2 for pipeline pre-cooling. The liquid methane collection tank inlet valve X19 is normally open. Then, the liquid methane low-pressure circuit exhaust valve X10 is opened to pre-cool and release the gas generated by vaporization heat exchange during the pre-cooling of the low-pressure liquid methane main pipeline x1 and the low-pressure liquid methane branch pipeline x2. The exhaust gas is transported to the liquid methane collection tank U1 by x6. When the temperature sensor XT3 of the low-pressure liquid methane circuit of the gas generator shows that the temperature of the methane inlet is 111K~114K, the pre-cooling of the medium in the low-pressure liquid methane main pipeline x1 and the low-pressure liquid methane branch pipeline x2 basically meets the requirements, and the liquid methane low-pressure circuit exhaust valve X10 is closed to stop the exhaust.

[0258] (2) Then pressurize the nitrogen in the liquid oxygen methane high and low pressure system tank.

[0259] High-pressure liquid oxygen storage tank: The liquid oxygen high-pressure booster manual valve G6 remains normally open. The second bypass discharge valve L3 is closed, and the gas supply valve in the second gas distribution plate D2 is opened to deliver pressurized nitrogen to the front of the second liquid oxygen main booster solenoid valve G1 and the second liquid oxygen auxiliary booster solenoid valve G2. The fourth control device HK4 is used for automatic control of the booster. The second liquid oxygen main booster solenoid valve G1 is opened, and the pressurized nitrogen after gas distribution is rapidly boosted by a large flow of nitrogen to the high-pressure liquid oxygen storage tank O2 through the second gas distribution plate D2. When the pressure sensor GP of the high-pressure liquid oxygen storage tank reaches the stable pressure value required for the test, the pressure is kept stable.

[0260] Low-pressure liquid oxygen storage tank: The liquid oxygen low-pressure boosting manual valve E6 remains normally open. The liquid oxygen low-pressure anti-backpressure pipeline J3 is closed. The gas supply valve in the first gas distribution plate D1 is opened to deliver pressurized nitrogen to the first liquid oxygen main boosting solenoid valve E1 and the first liquid oxygen auxiliary boosting solenoid valve E2. The third control device HK3 is used for automatic pressurization control. The first liquid oxygen main boosting solenoid valve E1 is opened. The pressurized nitrogen after gas distribution is delivered from the first gas distribution plate D1 through the first boosting gas supply pipeline d1 and the liquid oxygen low-pressure main boosting pipeline e1 to the low-pressure liquid oxygen storage tank O1 for rapid pressurization at a high flow rate. When the liquid oxygen low-pressure storage tank pressure sensor EP reaches the stable pressure value required for the test, the pressure is maintained in a stable state.

[0261] High-pressure liquid methane storage tank: The high-pressure booster valve H6 for liquid methane remains normally open. The third bypass discharge valve N3 is closed, and the gas supply valve in the third gas distribution plate D3 is opened to deliver booster nitrogen to the front of the third liquid methane main booster solenoid valve H1 and the third liquid methane auxiliary booster solenoid valve H2. The fifth control device HK5 is used for automatic control of the booster. The third liquid methane main booster solenoid valve H1 is opened, and the booster nitrogen after gas distribution is delivered from the third gas distribution plate D3 through the third booster gas supply pipeline d3 and the liquid methane high-pressure main booster pipeline h1 to the high-pressure liquid methane storage tank O3 for rapid booster nitrogen pressurization at a large flow rate. When the pressure sensor HP of the high-pressure liquid methane storage tank reaches the stable pressure value required for the test, the pressure is kept stable.

[0262] Low-pressure liquid methane storage tank: The low-pressure booster valve F6 for liquid methane in the storage tank remains normally open. The fourth bypass discharge valve K3 is closed, and the gas supply valve in the fourth gas distribution plate D4 is opened to deliver pressurized nitrogen to the fourth liquid methane main booster solenoid valve F1 and the fourth liquid methane auxiliary booster solenoid valve F2. Automatic pressurization is controlled by the sixth control device HK6. The fourth liquid methane main booster solenoid valve F1 is opened, and the pressurized nitrogen after gas distribution is delivered from the fourth gas distribution plate D4 through the fourth booster gas supply line d4 and the liquid methane low-pressure main booster line f1 to the low-pressure liquid methane storage tank O4 for rapid high-flow-rate nitrogen boosting. Once the pressure sensor FP of the low-pressure liquid methane storage tank reaches the stable pressure value required for the test, the pressure is maintained at a stable state.

[0263] (3) Finally, an ignition test was conducted on the liquid oxygen methane high and low pressure system medium pressurization and delivery to the turbo pump and gas generator assembly.

[0264] When the nitrogen pressurization pressure in the storage tanks of the liquid oxygen and methane high and low pressure modules reaches the set value for the test, the automatic timing sequence for the ignition test of the turbopump and gas generator assembly is activated. Liquid oxygen and liquid methane are pressurized and extruded, simultaneously delivered to the turbopump and gas generator assembly for ignition testing via low-pressure liquid oxygen branch pipeline y2, high-pressure liquid oxygen main pipeline, and low-pressure liquid methane branch pipeline x2 and high-pressure liquid methane main pipeline x3. During the ignition test, the liquid levels of O1, O2, O3, and O4 are simultaneously monitored using level gauges OL1 (low-pressure liquid oxygen tank), OL2 (high-pressure liquid oxygen tank), OL3 (high-pressure liquid methane tank), and OL4 (low-pressure liquid methane tank).

[0265] When the test conditions need to be changed during the ignition test and the nitrogen boost pressure needs to be increased rapidly, if the boost pressure of the liquid oxygen high-pressure tank g1 is insufficient, the second liquid oxygen auxiliary boost solenoid valve G2 is opened, using both the liquid oxygen high-pressure main boost line g1 and the liquid oxygen high-pressure auxiliary boost line g2 for simultaneous boosting. If the boost pressure of the liquid oxygen low-pressure main boost line e1 is insufficient, the first liquid oxygen auxiliary boost solenoid valve E2 is opened, using both the liquid oxygen low-pressure main boost line e1 and the liquid oxygen low-pressure auxiliary boost line e2 for simultaneous boosting. If the boost pressure of the liquid methane high-pressure main boost line h1 is insufficient, the third liquid methane auxiliary boost solenoid valve H2 is opened, using both the liquid methane high-pressure main boost line h1 and the liquid methane high-pressure auxiliary boost line h2 for simultaneous boosting. When the pressure of the liquid methane low-pressure main booster pipe f1 is insufficient to meet the boosting capacity, the fourth liquid methane auxiliary booster solenoid valve F2 is opened to simultaneously boost the pressure using both the liquid methane low-pressure main booster pipe f1 and the liquid methane low-pressure auxiliary booster pipe f2.

[0266] When the ignition test of the turbopump and gas generator assembly is completed, the fourth control device HK4 of the liquid oxygen high-pressure system opens the second bypass discharge valve L3 to release gas from the high-pressure liquid oxygen storage tank O2, and opens the liquid oxygen high-pressure circuit drain valve Y16 to drain the high-pressure liquid oxygen main circuit y3. The drained medium is discharged into the liquid oxygen collection tank S1 through the liquid oxygen high-pressure circuit drain pipe y5, the gas generator liquid oxygen low-pressure circuit drain pipe y4, and the liquid oxygen low-pressure circuit exhaust pipe y6. When the venting and drainage reach the point where the liquid oxygen high-pressure storage tank pressure sensor GP and the liquid oxygen high-pressure circuit pressure sensor YP2 display reasonable values, the second bypass discharge valve L3 and the liquid oxygen high-pressure circuit drain valve Y16 are closed, and the second anti-backpressure valve L4 is manually opened to prevent backpressure caused by the evaporation of the residual medium in the high-pressure liquid oxygen storage tank O2. Liquid oxygen low-pressure system: The third control device HK3 opens the liquid oxygen low-pressure anti-backpressure pipeline J3 to release gas from the low-pressure liquid oxygen storage tank O1, and opens the liquid discharge valve Y9 of the gas generator liquid oxygen low-pressure line to drain the liquid from the low-pressure liquid oxygen branch pipeline y2. The drained medium is discharged into the liquid oxygen collection tank S1 through the liquid discharge pipeline y4 of the gas generator liquid oxygen low-pressure line, the liquid oxygen low-pressure line exhaust pipeline, and y6. When the venting and drainage reach the point where the pressure sensor EP of the liquid oxygen low-pressure storage tank and the pressure sensor YP3 of the gas generator liquid oxygen low-pressure line display reasonable values, the first bypass discharge valve J3 and the liquid discharge valve Y9 of the gas generator liquid oxygen low-pressure line are closed, and the first anti-backpressure hand valve J4 is manually opened to prevent the residual medium in the low-pressure liquid oxygen storage tank O1 from evaporating and causing backpressure.

[0267] Liquid methane high-pressure system: The fifth control device HK5 opens the third bypass vent valve N3 to release gas from the high-pressure liquid methane storage tank O3, and opens the liquid methane high-pressure line drain valve X16 to drain liquid from the high-pressure liquid methane main line x3. The drained medium is discharged into the liquid methane collection tank U1 through the liquid methane high-pressure line drain line x5, the gas generator liquid methane low-pressure line drain line x4, and the liquid methane low-pressure line exhaust line x6. When the venting and drainage continue until the pressure sensors HP and XP2 of the liquid methane high-pressure storage tank and the liquid methane high-pressure line are within a reasonable range, the third bypass vent valve N3 and the liquid methane high-pressure line drain valve X16 are closed manually. Liquid methane low-pressure system: The sixth control device HK6 opens the fourth bypass vent valve K3 to vent the low-pressure liquid methane storage tank O4, and opens the liquid drain valve X9 of the low-pressure liquid methane branch line x2 of the gas generator to drain the liquid. The drained medium is discharged from the liquid methane low-pressure line drain line x4 of the gas generator and the liquid methane low-pressure line exhaust line x6 to the liquid methane collection tank U1. When the vented and drained liquid reaches the reasonable range values ​​displayed by the pressure sensor FP of the liquid methane low-pressure storage tank and the pressure sensor XP3 of the liquid methane low-pressure line of the gas generator, the fourth bypass vent valve K3 and the liquid methane low-pressure line drain valve X9 of the gas generator are closed, and the fourth anti-backpressure valve K4 is manually opened to prevent backpressure caused by the evaporation of the residual medium in the low-pressure liquid methane storage tank O4.

[0268] (4) To recycle and reuse the emission media of the liquid oxygen emission collection system and the liquid methane emission collection system.

[0269] Liquid oxygen recovery from the liquid oxygen collection tank: Close the liquid oxygen collection tank discharge bypass valve S3 and open the liquid oxygen collection tank gas supply valve D5. Pressurized nitrogen is supplied to the liquid oxygen collection tank S1 via the first gas distribution plate D1 and the fifth pressurized gas supply pipeline d5. Once the liquid oxygen collection tank S1 is pressurized to the value of the liquid oxygen collection tank pressure sensor SP, close the liquid oxygen collection tank gas supply valve D5. The first control device HK1 opens the liquid oxygen collection tank recovery valve S4, the liquid oxygen low-pressure storage tank inlet valve P10, or the liquid oxygen high-pressure storage tank inlet valve P12. The liquid oxygen in the liquid oxygen collection tank S1 is pressurized and compressed, and then transported through the liquid oxygen collection tank recovery pipeline S1 to the low-pressure liquid oxygen storage tank O1 and the high-pressure liquid oxygen storage tank O2. When the liquid oxygen collection tank level gauge SL shows no liquid level, after the recovery is complete, close the liquid oxygen collection tank recovery valve S4, the liquid oxygen low-pressure storage tank inlet valve P10 or the liquid oxygen high-pressure storage tank inlet valve P12, and then open the liquid oxygen collection tank discharge bypass valve S3 to prevent the residual medium in the liquid oxygen collection tank S1 from evaporating and causing pressure buildup.

[0270] Liquid oxygen recovery from the liquid methane collection tank: Close the liquid methane collection tank discharge bypass valve U3 and open the liquid methane collection tank gas supply valve D6. Pressurized nitrogen gas is supplied to the liquid methane collection tank U1 via the fourth gas distribution plate D4 and the sixth pressurized gas supply pipeline d6. Once the liquid methane collection tank U1 is pressurized to the set value, close the liquid methane collection tank gas supply valve D6. The second control device HK2 opens the liquid methane collection tank recovery valve U4, the liquid methane low-pressure storage tank inlet valve R10, or the liquid methane high-pressure storage tank inlet valve R12. The liquid methane in the liquid methane collection tank U1 is pressurized and compressed, and then transported through the liquid methane collection tank recovery pipeline u1 to the low-pressure liquid methane storage tank O4 or the high-pressure liquid methane storage tank O3. When the liquid level gauge UL of the liquid methane collection tank shows no liquid level, after the recovery is complete, close the liquid methane collection tank recovery valve U4, the liquid methane low-pressure storage tank inlet valve R10 or the liquid methane high-pressure storage tank inlet valve R12, and then open the liquid methane collection tank discharge bypass valve U3 to prevent the residual medium in the liquid methane collection tank U1 from evaporating and causing pressure buildup.

[0271] The above description is merely an illustrative embodiment of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A multi-functional test system for a liquid oxygen-methane engine test stand, characterized in that, The multifunctional test system comprises an air path system, a liquid path system, a test work station and a control module, wherein The air path system and the liquid path system are connected by pipelines for air supply, the liquid path system is connected with the test work station for providing liquid fuel required by the test work station, and the control module is connected to control the operation of the air path system and the liquid path system; The air path system comprises a first liquid nitrogen storage module (A), a second liquid nitrogen storage module (B), a gas production module (C) and a gas distribution module (D), wherein the first liquid nitrogen storage module (A) is connected with the gas production module (C) by pipelines for gas production, and the gas production module (C) is connected with the gas distribution module (D) by pipelines for gas distribution for the liquid path system; The liquid path system comprises a liquid oxygen storage module (P), a liquid methane storage module (R), a liquid oxygen subcooling module (W), a liquid methane subcooling module (V), a liquid oxygen delivery module (Y) and a liquid methane delivery module (X), wherein the first liquid nitrogen storage module (A) is connected with the liquid oxygen subcooling module (W) by pipelines for providing subcooling agent, the liquid oxygen storage module (P) is connected with the liquid oxygen subcooling module (W) by pipelines for liquid oxygen subcooling, and the liquid oxygen storage module (P) and the liquid oxygen subcooling module (W) are both connected with the liquid oxygen delivery module (Y) by pipelines for providing liquid oxygen for test; The second liquid nitrogen storage module (B) is connected with the liquid methane subcooling module (V) by pipelines for providing subcooling agent, the liquid methane storage module (R) is connected with the liquid methane subcooling module (V) by pipelines for liquid methane subcooling, and the liquid methane storage module (R) and the liquid methane subcooling module (V) are both connected with the liquid methane delivery module (X) by pipelines for providing liquid methane for test; The test work station comprises an engine whole vehicle test work station (M) and an engine assembly test work station (Z), wherein the engine whole vehicle test work station (M) is connected with the liquid oxygen delivery module (Y) and the liquid methane delivery module (X) for low pressure test; The engine assembly test work station (Z) is connected with the liquid oxygen delivery module (Y) and the liquid methane delivery module (X) for high pressure test and high-low pressure test; The first liquid nitrogen storage module (A) is used for storing and providing liquid nitrogen, and comprises a first liquid nitrogen storage tank (A1) for storing liquid nitrogen; the first liquid nitrogen storage tank (A1) is connected with a first liquid nitrogen filling tank vehicle (A2) through a first liquid nitrogen storage tank filling pipeline (a1) to fill liquid nitrogen; the first liquid nitrogen storage tank (A1) is connected with a first liquid nitrogen storage tank self-pressurizing pipeline (a2); the first liquid nitrogen storage tank self-pressurizing pipeline (a2) is connected with the bottom of the first liquid nitrogen storage tank (A1) at the upstream and connected with the top of the first liquid nitrogen storage tank (A1) at the downstream; the first liquid nitrogen storage tank (A1) is connected with the liquid oxygen subcooling module (W) through a first liquid nitrogen filling pipeline (a3); the first liquid nitrogen storage tank self-pressurizing pipeline (a2) is connected with a first liquid nitrogen storage tank discharge pipeline (a4) at the downstream; the first liquid nitrogen filling pipeline (a3) is connected with a second liquid nitrogen filling pipeline (a5).

2. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 1, characterized in that, The liquid path system further comprises a liquid oxygen recovery module (S) and a liquid methane recovery module (U), wherein the liquid oxygen recovery module (S) is connected with the liquid oxygen delivery module (Y) through a pipeline to recover liquid oxygen and its gasification gas in the pipeline; The liquid methane recovery module (U) is connected with the liquid methane delivery module (X) through a pipeline to recover liquid methane and its gasification gas in the pipeline; The liquid oxygen recovery module (S) pressurizes the liquid oxygen recovered in the inside to be delivered to the liquid oxygen storage module (P) or the liquid oxygen storage tank of the liquid oxygen delivery module (Y) through a pipeline; The liquid methane recovery module (U) pressurizes the liquid methane recovered in the inside to be delivered to the liquid methane storage module (R) or the liquid methane storage tank of the liquid methane delivery module (X) through a pipeline.

3. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 2, characterized in that, The liquid oxygen delivery module (Y) comprises a low-pressure liquid oxygen delivery module and a high-pressure liquid oxygen delivery module, wherein The low-pressure liquid oxygen delivery module comprises a low-pressure liquid oxygen storage tank (O1), a low-pressure liquid oxygen main pipeline (y1) and a low-pressure liquid oxygen branch pipeline (y2) to deliver low-pressure liquid oxygen for test running to the engine whole vehicle test running station (M) and the engine assembly test running station (Z); The liquid oxygen subcooled in the liquid oxygen subcooler (W1) of the liquid oxygen subcooling module (W) is delivered to the low-pressure liquid oxygen storage tank (O1) through a liquid oxygen subcooler outlet pipeline (w2) and a low-pressure liquid oxygen storage tank filling pipeline (p3); The upper part of the low-pressure liquid oxygen storage tank (O1) is connected with the gas distribution module (D) through a first pressurizing module (E) to be pressurized by gas distribution, and is depressurized through a first discharge module (J); The high-pressure liquid oxygen delivery module comprises a high-pressure liquid oxygen storage tank (O2) and a high-pressure liquid oxygen main pipeline (y3) to deliver high-pressure liquid oxygen for test running to the engine assembly test running station (Z); The liquid oxygen subcooled in the liquid oxygen subcooler (W1) of the liquid oxygen subcooling module (W) is delivered to the high-pressure liquid oxygen storage tank (O2) through a liquid oxygen subcooler outlet pipeline (w2) and a high-pressure liquid oxygen storage tank filling pipeline (p4); The upper part of the high-pressure liquid oxygen tank (O2) is connected to the gas distribution module (D) through the second pressure boosting module (G) for gas distribution and pressure boosting, and is connected to the second discharge module (L) for pressure relief.

4. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 3, wherein The low-pressure liquid oxygen main pipeline (y1), the low-pressure liquid oxygen branch pipeline (y2), and the high-pressure liquid oxygen main pipeline (y3) are connected to the liquid oxygen recovery module (S) through pipelines for recovery of liquid oxygen and gasification gas.

5. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 3, wherein The liquid methane delivery module (X) includes a low-pressure liquid methane delivery module and a high-pressure liquid methane delivery module, wherein, The low-pressure liquid methane delivery module includes a low-pressure liquid methane tank (O4), a low-pressure liquid methane main pipeline (x1), and a low-pressure liquid methane branch pipeline (x2) for delivering low-pressure liquid methane for test running to the engine vehicle test running station (M) and the engine assembly test running station (Z); The liquid methane subcooled in the liquid methane subcooler (V1) of the liquid methane subcooling module (V) is delivered to the low-pressure liquid methane tank (O4) through the liquid methane subcooler outlet pipeline (v2) and the low-pressure liquid methane tank filling pipeline (r3); The upper part of the low-pressure liquid methane tank (O4) is connected to the gas distribution module (D) through the fourth pressure boosting module (F) for gas distribution and pressure boosting, and is connected to the fourth discharge module (K) for pressure relief; The high-pressure liquid methane delivery module includes a high-pressure liquid methane tank (O3) and a high-pressure liquid methane main pipeline (x3) for delivering high-pressure liquid methane for test running to the engine assembly test running station (Z); The liquid methane subcooled in the liquid methane subcooler (V1) of the liquid methane subcooling module (V) is delivered to the high-pressure liquid methane tank (O3) through the liquid methane subcooler outlet pipeline (v2) and the high-pressure liquid methane tank filling pipeline (r4); The upper part of the high-pressure liquid methane tank (O3) is connected to the gas distribution module (D) through the third pressure boosting module (H) for gas distribution and pressure boosting, and is connected to the third discharge module (N) for pressure relief.

6. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 5, wherein The low-pressure liquid methane main pipeline (x1), the low-pressure liquid methane branch pipeline (x2), and the high-pressure liquid methane main pipeline (x3) are connected to the liquid methane recovery module (U) through pipelines for recovery of liquid methane and gasification gas.

7. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 5, wherein The engine vehicle test running station (M) is a low-pressure test running engine (M1); The low-pressure liquid oxygen tank (O1) is connected to the liquid oxygen inlet of the low-pressure test running engine (M1) through the low-pressure liquid oxygen main pipeline (y1) to provide low-pressure liquid oxygen for test running; The low-pressure liquid methane tank (O4) is connected to the liquid methane inlet of the low-pressure test running engine (M1) through the low-pressure liquid methane main pipeline (x1) to provide low-pressure liquid methane for test running; The engine assembly test running station (Z) includes a turbine pump (Z1) and a gas generator (Z2); The low-pressure liquid oxygen tank (O1) is connected to the liquid oxygen inlet of the gas generator (Z2) through the low-pressure liquid oxygen main pipeline (y1) and the low-pressure liquid oxygen branch pipeline (y2) to provide low-pressure liquid oxygen for test running; The high-pressure liquid oxygen tank (O2) is connected to the liquid oxygen inlet of the turbine pump (Z1) through the high-pressure liquid oxygen main pipeline (y3) to provide high-pressure liquid oxygen for test run; The low-pressure liquid methane tank (O4) is connected to the liquid methane inlet of the gas generator (Z2) through the low-pressure liquid methane main pipeline (x1) and the low-pressure liquid methane branch pipeline (x2) to provide low-pressure liquid methane for test run; The high-pressure liquid methane tank (O3) is connected to the liquid methane inlet of the turbine pump (Z1) through the high-pressure liquid methane main pipeline (x3) to provide high-pressure liquid methane for test run.

8. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 5, wherein The gas production module (C) includes a liquid nitrogen storage tank (C1), a liquid nitrogen plunger pump (C2), a liquid nitrogen vaporizer (C3), and a high-pressure nitrogen cylinder group (C4), wherein The liquid nitrogen in the first liquid nitrogen storage module (A) is filled into the liquid nitrogen storage tank (C1) through the second liquid nitrogen filling pipeline (a5), then pumped into the liquid nitrogen vaporizer (C3) through the liquid nitrogen plunger pump (C2) for gasification, and finally the gasified nitrogen is stored in the high-pressure nitrogen cylinder group (C4); The high-pressure nitrogen cylinder group (C4) is delivered to the nitrogen gas distribution module (D) through the nitrogen delivery main pipeline (c0).

9. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 8, wherein The nitrogen gas distribution module (D) includes a first gas distribution board (D1), a second gas distribution board (D2), a third gas distribution board (D3), and a fourth gas distribution board (D4) connected in parallel to the nitrogen delivery main pipeline (c0), wherein The first gas distribution board (D1) is connected to the first pressure boosting module (E) for pressure boosting through the first pressure boosting gas pipeline (d1); The second gas distribution board (D2) is connected to the second pressure boosting module (G) for pressure boosting through the second pressure boosting gas pipeline (d2); The third gas distribution board (D3) is connected to the third pressure boosting module (H) for pressure boosting through the third pressure boosting gas pipeline (d3); The fourth gas distribution board (D4) is connected to the fourth pressure boosting module (F) for pressure boosting through the fourth pressure boosting gas pipeline (d4).

10. The multi-functional test system of the liquid oxygen-methane engine test stand according to claim 5, wherein The first liquid nitrogen storage module (A) provides subcooling agent for the liquid oxygen subcooler (W1) through the first liquid nitrogen filling pipeline (a3), and the liquid oxygen storage module (P) delivers liquid oxygen to the liquid oxygen subcooler (W1) for liquid oxygen subcooling through the liquid oxygen subcooler inlet pipeline (w1); The second liquid nitrogen storage module (B) provides subcooling agent for the liquid methane subcooler (V1) through the third liquid nitrogen filling pipeline (b3), and the liquid methane storage module (R) delivers liquid methane to the liquid methane subcooler (V1) for liquid methane subcooling through the liquid methane subcooler inlet pipeline (v1).

Images