Liquid oxygen methane engine test bed composed of multifunctional test system

Abstract

The invention provides a liquid oxygen methane engine test bed composed of a multifunctional test system. The test bed comprises a gas path system, a liquid path system and a test station. Wherein the gas path system and the liquid path system are connected through a pipeline for gas supply, and the liquid path system is connected with the test run station and used for providing liquid fuel needed by testing for the test run station. The liquid path system comprises a low-pressure liquid path module and a high-pressure liquid path module. And the low-pressure liquid path module and the high-pressure liquid path module are respectively connected with a test run station. The test bed is composed of a set of gas path system, two sets of liquid path systems and three test stations. The two sets of liquid path systems jointly adopt one set of gas path system for gas supply, so that medium conveying can be carried out on the three test run stations according to requirements, the test run platform can meet the gas distribution requirements of engines of different models, meanwhile, the resource sharing of test equipment is improved, the total cost of equipment construction and maintenance is greatly reduced, and the working efficiency is improved. And the engine testing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rocket engine test stands, and specifically to a liquid oxygen methane engine test stand composed of a multi-functional test system. Background Art

[0002] In the field of commercial spaceflight, the technology of liquid oxygen / methane carrier rockets has developed very rapidly. The main core to ensure the successful launch of liquid oxygen / methane carrier rockets is to have a liquid oxygen / methane carrier rocket engine with reliable performance. The research and development, performance optimization, reliability, and innovation of liquid oxygen / methane carrier rocket engines all require the use of a liquid oxygen / methane carrier rocket engine test stand to conduct experimental verification on them.

[0003] The test stand is a key facility in the process of developing rocket engines. According to the industry's statement, rocket engines are designed and also tested. Through experiments, the feasibility of the engine design and process is verified, and the development goals are achieved through multiple rounds of improvement and optimization. Usually, for the development of rocket engines, at least 20,000 seconds of test runs are generally required. In addition, in the early stage of the engine development phase, test design will be carried out in combination with the demonstration of the product design scheme and mission requirements, and it is ensured that all technical and management risks and their impacts and consequences are controlled within the specified acceptable range.

[0004] At present, the test systems of liquid oxygen / methane carrier rocket engine test stands involved in the space field are relatively single and independent, roughly divided into a liquid oxygen methane low-temperature and low-pressure system and a liquid oxygen methane low-temperature and high-pressure system. Each of these two test systems needs to build a separate test stand to achieve. For the test stand test system adopting this mode, a large safety distance needs to be maintained between them during construction, resulting in a large occupied area for the test area, extremely high construction costs, and the need to repeat the construction of some equipment and facilities, thus increasing the land area and also increasing the investment and maintenance costs of the equipment and facilities. At the same time, the development of liquid oxygen / methane engines involves multiple stages and various types of test items, and it is very difficult for the single test system of the engine test stand to meet and adapt to the development needs of the engine in multiple stages.

[0005] Therefore, there is an urgent need to build an engine test stand that can meet the requirements of multiple stages, various types, different sizes, and application scenarios of liquid oxygen / methane engines, and at the same time can reduce the investment and construction costs. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a liquid oxygen methane engine test stand composed of a multi-functional test system, so as to solve the problems that the existing engine test stands cannot meet the test requirements of various types, different sizes, and different application scenarios, and the construction costs are high.

[0007] The present invention provides a test bench for a liquid oxygen-methane engine composed of a multi-functional test system. The test bench includes a gas circuit system, a liquid circuit system, and a test station. Among them, the gas circuit system and the liquid circuit system are connected by pipelines to supply gas, and the liquid circuit system is connected to the test station to provide the liquid fuel required for testing to the test station. The gas circuit system includes: a first liquid nitrogen storage module, a second liquid nitrogen storage module, a gas generation module, and a gas distribution module. Among them, the first liquid nitrogen storage module is connected to the gas generation module through a pipeline for gas generation, and the gas generation module is connected to the gas distribution module through a pipeline for gas distribution to the liquid circuit system. The liquid circuit system includes: a low-pressure liquid circuit module, a high-pressure liquid circuit module, a liquid oxygen storage module, a liquid methane storage module, a liquid oxygen subcooling module, and a liquid methane subcooling module. Among them, the first liquid nitrogen storage module is connected to the liquid oxygen subcooling module through a pipeline to provide a subcooling agent, the liquid oxygen storage module is connected to the liquid oxygen subcooling module through a pipeline for liquid oxygen subcooling, and the liquid oxygen subcooling module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module through a pipeline to provide subcooled liquid oxygen. The second liquid nitrogen storage module is connected to the liquid methane subcooling module through a pipeline to provide a subcooling agent, the liquid methane storage module is connected to the liquid methane subcooling module through a pipeline for liquid methane subcooling, and the liquid methane subcooling module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module through a pipeline to provide subcooled liquid methane. The low-pressure liquid circuit module and the high-pressure liquid circuit module are respectively connected to the test station.

[0008] In an embodiment of the present invention, the liquid circuit system further includes: a liquid oxygen recovery module and a liquid methane recovery module. Among them, the liquid oxygen recovery module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module through a pipeline to recover the liquid oxygen in the pipeline; the liquid methane recovery module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module through a pipeline to recover the liquid methane in the pipeline.

[0009] Furthermore, the low-pressure liquid circuit module includes: a low-pressure liquid oxygen storage tank and a low-pressure liquid methane storage tank. Among them, the liquid oxygen supercooled in the liquid oxygen subcooler of the liquid oxygen subcooling module is transported to the low-pressure liquid oxygen storage tank through the liquid oxygen subcooler outlet pipeline and the low-pressure liquid oxygen filling pipeline; the liquid methane supercooled in the liquid methane subcooler of the liquid methane subcooling module is transported to the low-pressure liquid methane storage tank through the liquid methane subcooler outlet pipeline and the low-pressure liquid methane filling pipeline; the upper part of the low-pressure liquid oxygen storage tank is connected to the gas distribution module through the first pressurization module for gas distribution and pressurization, and is depressurized through the first discharge module; the lower part of the low-pressure liquid oxygen storage tank is connected to the first test stand through the low-pressure liquid oxygen main pipeline and the first low-pressure liquid oxygen branch pipeline; the lower part of the low-pressure liquid oxygen storage tank is connected to the second test stand through the low-pressure liquid oxygen main pipeline and the second low-pressure liquid oxygen branch pipeline; the upper part of the low-pressure liquid methane storage tank is connected to the gas distribution module through the second pressurization module for gas distribution and pressurization, and is depressurized through the second discharge module; the lower part of the low-pressure liquid methane storage tank is connected to the first test stand through the low-pressure liquid methane main pipeline and the first low-pressure liquid methane branch pipeline; the lower part of the low-pressure liquid methane storage tank is connected to the second test stand through the low-pressure liquid methane main pipeline and the second low-pressure liquid methane branch pipeline.

[0010] Furthermore, the upstream of the first low-pressure liquid oxygen branch pipeline is connected to the liquid oxygen recovery module through the first recovery pipeline and the fifth recovery pipeline; the upstream of the second low-pressure liquid oxygen branch pipeline is connected to the liquid oxygen recovery module through the second recovery pipeline and the fifth recovery pipeline; the upstream of the first low-pressure liquid methane branch pipeline is connected to the liquid methane recovery module through the third recovery pipeline; the upstream of the second low-pressure liquid methane branch pipeline is connected to the liquid methane recovery module through the fourth recovery pipeline and the third recovery pipeline.

[0011] Furthermore, the high-pressure liquid circuit module includes: a high-pressure liquid oxygen storage tank and a high-pressure liquid methane storage tank. Among them, the liquid oxygen supercooled 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 filling pipeline; the liquid methane supercooled 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 filling pipeline; the upper part of the high-pressure liquid oxygen storage tank is connected to the gas distribution module through the third pressurization module for gas distribution and pressurization, and is depressurized through the third discharge module; the lower part of the high-pressure liquid oxygen storage tank is connected to the third test stand through the high-pressure liquid oxygen main pipeline; the upper part of the high-pressure liquid methane storage tank is connected to the gas distribution module through the fourth pressurization module for gas distribution and pressurization, and is depressurized through the fourth discharge module; the lower part of the high-pressure liquid methane storage tank is connected to the third test stand through the high-pressure liquid methane main pipeline.

[0012] Further, the upstream of the high-pressure liquid oxygen main pipeline is connected to the liquid oxygen recovery module through a fifth recovery pipeline; the upstream of the high-pressure liquid methane main pipeline is connected to the liquid methane recovery module through a sixth recovery pipeline and a third recovery pipeline.

[0013] Further, the liquid oxygen recovery module includes a liquid oxygen recovery tank, the bottom of which is connected to the liquid oxygen storage module through a seventh recovery pipeline; the liquid methane recovery module includes a liquid methane recovery tank, the bottom of which is connected to the liquid methane storage module through an eighth recovery pipeline.

[0014] In an embodiment of the present invention, the gas generation module includes: a liquid nitrogen storage tank, a liquid nitrogen piston pump, a liquid nitrogen vaporizer, and a high-pressure nitrogen gas cylinder group. Among them, the liquid nitrogen in the first liquid nitrogen storage module is filled into the liquid nitrogen storage tank through a second liquid nitrogen filling pipeline, pumped into the liquid nitrogen vaporizer by the liquid nitrogen piston pump for gasification, and the gasified nitrogen is stored in the high-pressure nitrogen gas cylinder group; the high-pressure nitrogen gas cylinder group is transported to the nitrogen gas distribution module through a nitrogen gas transportation main pipeline.

[0015] Further, 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 to the nitrogen gas transportation main pipeline. Among them, the first gas distribution plate is connected to the first pressurization module through a first pressurized gas supply pipeline for pressurized gas supply; the second gas distribution plate is connected to the second pressurization module through a second pressurized gas supply pipeline for pressurized gas supply; the third gas distribution plate is connected to the third pressurization module through a third pressurized gas supply pipeline for pressurized gas supply; the fourth gas distribution plate is connected to the fourth pressurization module through a fourth pressurized gas supply pipeline for pressurized gas supply.

[0016] In an embodiment of the present invention, the liquid nitrogen in the first liquid nitrogen storage module provides a subcooling agent for the liquid oxygen subcooler through a first liquid nitrogen filling pipeline, and the liquid oxygen storage module transports liquid oxygen to the liquid oxygen subcooler through a liquid oxygen subcooler inlet pipeline for liquid oxygen subcooling; the liquid nitrogen in the second liquid nitrogen storage module provides a subcooling agent for the liquid methane subcooler through a third liquid nitrogen filling pipeline, and the liquid methane storage module transports liquid methane to the liquid methane subcooler through a liquid methane subcooler inlet pipeline for liquid methane subcooling.

[0017] According to the above embodiments, a liquid oxygen-methane engine test bench composed of a multi-functional test system provided by the present application has at least the following advantages: The test stand for the liquid oxygen-methane engine of the multi-functional test system consists of a set of gas circuits, two sets of liquid circuits, and three test stations. The two sets of liquid circuits include a low-pressure liquid circuit module and a high-pressure liquid circuit module. The two sets of liquid circuits jointly use a set of gas circuits for gas supply, and can thus deliver media to the three test stations according to requirements, achieving the gas distribution requirements for the test stand to match engines of different models. At the same time, the resource sharing of test equipment is improved, greatly reducing the total cost of equipment construction and maintenance, and enhancing the efficiency of engine testing.

[0018] In addition, the multi-functional test system can adjust some structures and parameters of the test stand to meet the test requirements of engines of different sizes. By simulating different application scenarios, targeted testing of the engines is carried out to ensure the reliability and adaptability of the engines, and the overall utilization rate of the test stand is improved.

[0019] It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and cannot limit the scope claimed by the present invention. Description of the Drawings

[0020] The following drawings are part of the specification of the present invention, which illustrate exemplary embodiments of the present invention. The attached drawings, together with the description of the specification, are used to explain the principles of the present invention.

[0021] Figure 1 It is a system structure diagram of a test stand for a liquid oxygen-methane engine composed of a multi-functional test system provided by the present invention.

[0022] Figure 2 It is a partially enlarged view of the low-pressure liquid circuit module of a test stand for a liquid oxygen-methane engine composed of a multi-functional test system provided by the present invention.

[0023] Figure 3 It is a partially enlarged view of the high-pressure liquid circuit module of a test stand for a liquid oxygen-methane engine composed of a multi-functional test system provided by the present invention. Explanation of Reference Numerals in the Drawings: A - First liquid nitrogen storage module, B - Second liquid nitrogen storage module, C - Gas generation module, D - Nitrogen gas distribution module, G - Low-pressure liquid circuit module, H - High-pressure liquid circuit module, L - Liquid oxygen recovery module, P - Liquid oxygen storage module, R - Liquid methane storage module, T - Liquid methane recovery module, V - Liquid methane subcooling module, W - Liquid oxygen subcooling module, Y - Diversion trough; A1 - First liquid nitrogen storage tank, B1 - Second liquid nitrogen storage tank; C1 - Liquid nitrogen storage tank, C2 - Liquid nitrogen plunger pump, C3 - Liquid nitrogen vaporizer, C4 - High-pressure nitrogen gas cylinder group; D1 - First gas distribution plate, D2 - Second gas distribution plate, D3 - Third gas distribution plate, D4 - Fourth gas distribution plate; E1 - First supercharging module, E2 - Second supercharging module, E3 - Third supercharging module, E4 - Fourth supercharging module; F1 - First discharge module, F2 - Second discharge module, F3 - Third discharge module, F4 - Fourth discharge module; G1 - Low - pressure liquid oxygen storage tank, G2 - Low - pressure liquid methane storage tank, H1 - High - pressure liquid oxygen storage tank, H2 - High - pressure liquid methane storage tank; L1 - Liquid oxygen recovery tank, T1 - Liquid methane recovery tank; M1 - First test run station, M2 - Second test run station, M3 - Third test run station; P1 - Liquid oxygen storage tank in the liquid oxygen storage area, R1 - Liquid methane storage tank in the liquid methane storage area, V1 - Liquid methane sub - cooler, W1 - Liquid oxygen sub - cooler; a1 - First liquid nitrogen filling pipeline, a2 - Second liquid nitrogen filling pipeline, b1 - Third liquid nitrogen filling pipeline, c1 - Main nitrogen transmission pipeline, d1 - First supercharging air supply pipeline, d2 - Second supercharging air supply pipeline, d3 - Third supercharging air supply pipeline, d4 - Fourth supercharging air supply pipeline, f1 - First cut - off valve, f2 - Second cut - off valve, f3 - Third cut - off valve, f4 - Fourth cut - off valve; g1 - Main low - pressure liquid oxygen pipeline, g2 - First low - pressure liquid oxygen branch pipeline, g3 - Second low - pressure liquid oxygen branch pipeline, g4 - First recovery pipeline, g5 - Second recovery pipeline, g6 - Main low - pressure liquid methane pipeline, g7 - First low - pressure liquid methane branch pipeline, g8 - Second low - pressure liquid methane branch pipeline, g9 - Third recovery pipeline, g10 - Fourth recovery pipeline; h1 - Main high - pressure liquid oxygen pipeline, h2 - Main high - pressure liquid methane pipeline, h3 - Fifth recovery pipeline, h4 - Sixth recovery pipeline, i1 - Seventh recovery pipeline, i2 - Eighth recovery pipeline; m1 - First engine, m2 - Second engine, m3 - Third engine; p1 - Low - pressure liquid oxygen filling pipeline, p2 - High - pressure liquid oxygen filling pipeline, r1 - High - pressure liquid methane filling pipeline, r2 - Low - pressure liquid methane filling pipeline, v1 - Liquid methane sub - cooler inlet pipeline, v2 - Liquid methane sub - cooler outlet pipeline, w1 - Liquid oxygen sub - cooler inlet pipeline, w2 - Liquid oxygen sub - cooler outlet pipeline. Detailed implementation manners

[0024] Now, various exemplary implementation manners of the present invention will 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, characteristics, and implementation schemes of the present invention.

[0025] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific embodiments of the specification of the present invention, which will be obvious to those skilled in the art. Other embodiments obtained from the specification of the present invention will be obvious to those skilled in the art. The specification and examples of this application are merely exemplary.

[0026] The present invention provides a liquid oxygen-methane engine test stand composed of a multi-functional test system, as Figures 1 - 3 shown in the schematic diagram of the system connection structure of the test stand. In the specific embodiment, the test stand includes a gas path system, a liquid path system, and a test station. Among them, the gas path system and the liquid path system are connected by pipelines to supply gas, and the liquid path system is connected to the test station to provide the liquid fuel required for testing for the test station. In this embodiment, it includes a set of gas path systems, two sets of liquid path systems, and three test stations. The three test stations are divided into two low-pressure test stations for the 100-ton engine whole machine and the 120-ton engine whole machine, and a high-pressure test station for the 30-ton engine whole machine. In addition, a diversion trough Y is provided below the test station. The diversion trough Y is an inclined water storage type diversion trough, which is used to divert the gas generated during the rocket engine test of the three test stations to reduce the noise pollution. The inclined water storage type diversion trough has a simpler structure and lower construction cost than the vertical diversion trough.

[0027] Specifically, the gas path system includes: the first liquid nitrogen storage module A, the second liquid nitrogen storage module B, the gas generation module C, and the gas distribution module D. Among them, the first liquid nitrogen storage module A is connected to the gas generation module C through a pipeline for gas generation, and the gas generation module C is connected to the gas distribution module D through a pipeline for gas distribution for the liquid path system.

[0028] In this embodiment, the liquid path system includes: a low-pressure liquid path module G, a high-pressure liquid path module H, a liquid oxygen storage module P, a liquid methane storage module R, a liquid oxygen subcooling module W, and a liquid methane subcooling module V. Among them, the first liquid nitrogen storage module A is connected to the liquid oxygen subcooling module W through a pipeline to provide a subcoolant, the liquid oxygen storage module P is connected to the liquid oxygen subcooling module W through a pipeline for liquid oxygen subcooling, and the liquid oxygen subcooling module W is connected to the low-pressure liquid path module G and the high-pressure liquid path module H through pipelines respectively, for providing subcooled liquid oxygen for them.

[0029] The second liquid nitrogen storage module B is connected to the liquid methane subcooling module V through a pipeline to provide a subcoolant, the liquid methane storage module R is connected to the liquid methane subcooling module V through a pipeline for liquid methane subcooling, and the liquid methane subcooling module V is connected to the low-pressure liquid path module G and the high-pressure liquid path module H through pipelines respectively, for providing subcooled liquid methane for them.

[0030] The low-pressure liquid path module G and the high-pressure liquid path module H are respectively connected to the test station. In this embodiment, the low-pressure liquid path module G is connected to two test stations, namely the two low-pressure test stations for the 100-ton engine whole machine and the 120-ton engine whole machine.

[0031] The high-pressure liquid path module H is connected to a test run station, which is a high-pressure test run station for a 30-ton engine as a whole.

[0032] In a specific embodiment of the present invention, the liquid path system further includes: a liquid oxygen recovery module L and a liquid methane recovery module T. Among them, the liquid oxygen recovery module L is connected to the low-pressure liquid path module G and the high-pressure liquid path module H through pipelines, and is used to recover liquid oxygen in the pipelines.

[0033] The liquid methane recovery module T is connected to the low-pressure liquid path module G and the high-pressure liquid path module H through pipelines, and is used to recover liquid methane in the pipelines.

[0034] In a specific embodiment of the present invention, the low-pressure liquid path module G includes: a low-pressure liquid oxygen storage tank G1 and a low-pressure liquid methane storage tank G2. Among them, the liquid oxygen that has completed subcooling in the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W is transported to the low-pressure liquid oxygen storage tank G1 through the liquid oxygen subcooler liquid outlet pipeline w2 and the low-pressure liquid oxygen filling pipeline p1 for subsequent test oxygen use.

[0035] The liquid methane that has completed subcooling in the liquid methane subcooler V1 of the liquid methane subcooling module V is transported to the low-pressure liquid methane storage tank G2 through the liquid methane subcooler liquid outlet pipeline v2 and the low-pressure liquid methane filling pipeline r2 for subsequent test methane use.

[0036] The upper part of the low-pressure liquid oxygen storage tank G1 is connected to the gas distribution module D through the first pressurization module E1 for gas distribution and pressurization, and is depressurized through the first discharge module F1. In this embodiment, the first pressurization module E1 includes: a solenoid valve, a flow-limiting orifice plate, and a filter. In addition, two-way pressurization is set for this pressurization module to improve the pressurization efficiency and safety. Solenoid valves and flow-limiting plates are arranged along the gas flow direction on both pressurization branches, and a filter is arranged on the downstream confluence main pipeline.

[0037] In this embodiment, the first discharge module F1 is used to exhaust and depressurize the low-pressure liquid oxygen storage tank G1, and it includes: a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, and a silencer.

[0038] The lower part of the low-pressure liquid oxygen storage tank G1 is connected to the first engine m1 in the first test run station M1 through the low-pressure liquid oxygen main pipeline g1 and the first low-pressure liquid oxygen branch pipeline g2 to supply liquid oxygen to the first engine m1.

[0039] The lower part of the low-pressure liquid oxygen storage tank G1 is connected to the second engine m2 in the second test run station M2 through the low-pressure liquid oxygen main pipeline g1 and the second low-pressure liquid oxygen branch pipeline g3 to supply liquid oxygen to the second engine m2.

[0040] The upper part of the low-pressure liquid methane storage tank G2 is connected to the gas distribution module D through the second pressurization module E2 for gas distribution and pressurization, and pressure relief is carried out through the second discharge module F2. In this embodiment, the second pressurization module E2 includes: a solenoid valve, a flow-limiting orifice plate, and a filter. In addition, two-way pressurization is set for this pressurization module to improve the pressurization efficiency and safety. Solenoid valves and flow-limiting plates are arranged along the gas flow direction on both pressurization branches, and a filter is arranged on the downstream confluence main road.

[0041] In this embodiment, the second discharge module F2 is used to exhaust and relieve pressure for the low-pressure liquid methane storage tank G2, and it includes: a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, and a silencer.

[0042] The lower part of the low-pressure liquid methane storage tank G2 is connected to the first engine m1 in the first test station M1 through the low-pressure liquid methane main pipeline g6 and the first low-pressure liquid methane branch pipeline g7, for delivering liquid methane to the first engine m1.

[0043] The lower part of the low-pressure liquid methane storage tank G2 is connected to the second engine m2 in the second test station M2 through the low-pressure liquid methane main pipeline g6 and the second low-pressure liquid methane branch pipeline g8, for delivering liquid methane to the second engine m2.

[0044] Further, the upstream of the first low-pressure liquid oxygen branch pipeline g2 is connected to the liquid oxygen recovery tank L1 in the liquid oxygen recovery module L through the first recovery pipeline g4 and the fifth recovery pipeline h3 to recover the liquid oxygen in the pipeline.

[0045] The upstream of the second low-pressure liquid oxygen branch pipeline g3 is connected to the liquid oxygen recovery tank L1 in the liquid oxygen recovery module L through the second recovery pipeline g5 and the fifth recovery pipeline h3 to recover the liquid oxygen in the pipeline.

[0046] The upstream of the first low-pressure liquid methane branch pipeline g7 is connected to the liquid methane recovery tank T1 in the liquid methane recovery module T through the third recovery pipeline g9 to recover the liquid methane in the pipeline.

[0047] The upstream of the second low-pressure liquid methane branch pipeline g8 is connected to the liquid methane recovery tank T1 in the liquid methane recovery module T through the fourth recovery pipeline g10 and the third recovery pipeline g9 to recover the liquid methane in the pipeline.

[0048] Exhaust valves are arranged on both the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 for pressure relief of the tank body.

[0049] In a specific embodiment of the present invention, the high-pressure liquid path module H includes: a high-pressure liquid oxygen storage tank H1 and a high-pressure liquid methane storage tank H2. Among them, the liquid oxygen that has completed subcooling in the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W is transported to the high-pressure liquid oxygen storage tank H1 through the liquid oxygen subcooler liquid outlet pipeline w2 and the high-pressure liquid oxygen filling pipeline p2 for subsequent oxygen use in experiments.

[0050] The liquid methane that has completed subcooling in the liquid methane subcooler V1 of the liquid methane subcooling module V is transported to the high-pressure liquid methane storage tank H2 through the liquid methane subcooler liquid outlet pipeline v2 and the high-pressure liquid methane filling pipeline r1 for subsequent methane use in experiments.

[0051] The upper part of the high-pressure liquid oxygen storage tank H1 is connected to the gas distribution module D through the third pressurization module E3 for gas distribution and pressurization, and is depressurized through the third discharge module F3. In this embodiment, the third pressurization module E3 includes: a solenoid valve, an orifice plate, and a filter. In addition, two-way pressurization is set in this pressurization module to improve the pressurization efficiency and safety. Solenoid valves and flow limiters are arranged along the gas flow direction on both pressurization branches, and a filter is arranged on the downstream converging main pipeline.

[0052] In this embodiment, the third discharge module F3 is used to exhaust and depressurize the high-pressure liquid oxygen storage tank H1, and it includes: a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, and a silencer.

[0053] The lower part of the high-pressure liquid oxygen storage tank H1 is connected to the third engine m3 in the third test station M3 through the high-pressure liquid oxygen main pipeline h1 for transporting liquid oxygen to the third engine m3.

[0054] The upper part of the high-pressure liquid methane storage tank H2 is connected to the gas distribution module D through the fourth pressurization module E4 for gas distribution and pressurization, and is depressurized through the fourth discharge module F4. In this embodiment, the fourth pressurization module E4 includes: a solenoid valve, an orifice plate, and a filter. In addition, two-way pressurization is set in this pressurization module to improve the pressurization efficiency and safety. Solenoid valves and flow limiters are arranged along the gas flow direction on both pressurization branches, and a filter is arranged on the downstream converging main pipeline.

[0055] In this embodiment, the fourth discharge module F4 is used to exhaust and depressurize the high-pressure liquid methane storage tank H2, and it includes: a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, a silencer, and a flame arrester.

[0056] The lower part of the high-pressure liquid methane storage tank H2 is connected to the third engine m3 in the third test station M3 through the high-pressure liquid methane main pipeline h2 for transporting liquid methane to the third engine m3.

[0057] Furthermore, the upstream of the high-pressure liquid oxygen main pipeline h1 is connected to the liquid oxygen recovery tank L1 in the liquid oxygen recovery module L through the fifth recovery pipeline h3 to recover the liquid oxygen in the pipeline.

[0058] The upstream of the high-pressure liquid methane main pipeline h2 is connected to the liquid methane recovery tank T1 in the liquid methane recovery module T through the sixth recovery pipeline h4 and the third recovery pipeline g9 to recover the liquid methane in the pipeline.

[0059] Both the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are provided with exhaust valves for relieving the pressure of the tank body.

[0060] Further, the bottom of the liquid oxygen recovery tank L1 is connected to the liquid oxygen storage module P through the seventh recovery pipeline i1. By pressurizing the liquid oxygen recovery tank L1, the recovered liquid oxygen is transported to the liquid oxygen storage tank P1.

[0061] The bottom of the liquid methane recovery tank T1 is connected to the liquid methane storage module R through the eighth recovery pipeline i2. By pressurizing the liquid methane recovery tank T1, the recovered liquid methane is transported to the liquid methane storage tank R1.

[0062] In the 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. Among them, 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 a2, pumped into the liquid nitrogen vaporizer C3 by the liquid nitrogen plunger pump C2 for gasification, and the gasified nitrogen is stored in the high-pressure nitrogen cylinder group C4. In this embodiment, multiple high-pressure nitrogen cylinder groups C4 are provided to provide sufficient high-pressure nitrogen.

[0063] The high-pressure nitrogen cylinder group C4 is transported to the nitrogen gas distribution module D through the nitrogen gas transmission main pipeline c1.

[0064] Further, the nitrogen gas distribution module D includes a first gas distribution plate D1, a second gas distribution plate D2, a third gas distribution plate D3, and a fourth gas distribution plate D4 connected in parallel on the nitrogen gas transmission main pipeline c1. Among them, The first gas distribution plate D1 is connected to the first boosting module E1 through the first boosting gas supply pipeline d1 for boosting and supplying gas, and then boosting the low-pressure liquid oxygen storage tank G1.

[0065] The second gas distribution plate D2 is connected to the second boosting module E2 through the second boosting gas supply pipeline d2 for boosting and supplying gas, and then boosting the low-pressure liquid methane storage tank G2.

[0066] The third gas distribution plate D3 is connected to the third boosting module E3 through the third boosting gas supply pipeline d3 for boosting and supplying gas, and then boosting the high-pressure liquid oxygen storage tank H1.

[0067] The fourth gas distribution plate D4 is connected to the fourth boosting module E4 through the fourth boosting gas supply pipeline d4 for boosting and supplying gas, and then boosting the high-pressure liquid methane storage tank H2.

[0068] In a specific embodiment of the present invention, liquid nitrogen in the first liquid nitrogen storage module A provides a subcoolant for the liquid oxygen subcooler W1 through the first liquid nitrogen filling pipeline a1. The liquid oxygen in the liquid oxygen storage tank P1 of the liquid oxygen storage module P is transported to the liquid oxygen subcooler W1 through the liquid oxygen subcooler inlet pipeline w1 for liquid oxygen subcooling, and the subcooled liquid oxygen is output through the liquid oxygen subcooler outlet pipeline w2.

[0069] Liquid nitrogen in the second liquid nitrogen storage module B provides a subcoolant for the liquid methane subcooler V1 through the third liquid nitrogen filling pipeline b1. The liquid methane in the liquid methane storage tank R1 of the liquid methane storage module R is transported to the liquid methane subcooler V1 through the liquid methane subcooler inlet pipeline v1 for liquid methane subcooling, and the subcooled liquid methane is output through the liquid methane subcooler outlet pipeline v2.

[0070] The operation process of the liquid oxygen-methane launch vehicle engine test stand is as follows: 1. Gas production is carried out using the gas production module.

[0071] Start the first liquid nitrogen storage module A. After the liquid nitrogen storage tank A1 pressurizes the tank through its own booster, liquid nitrogen is filled into the liquid nitrogen storage tank C1 of the gas production module C through the second liquid nitrogen filling pipeline a2, and then passes through the liquid nitrogen plunger pump C2 and the liquid nitrogen vaporizer C3 for gas production. After that, the nitrogen gas is stored in the high-pressure nitrogen gas cylinder group C4 for use during the test.

[0072] 2. When conducting a liquid oxygen-methane low-pressure test run: (1) Non-subcooled filling or subcooled filling of the low-pressure liquid oxygen storage tank G1 is carried out.

[0073] During non-subcooled filling: Start the liquid oxygen storage module P. After the liquid oxygen storage tank P1 pressurizes the tank through its own booster, liquid oxygen is transported to the low-pressure liquid oxygen storage tank G1 through the low-pressure liquid oxygen filling pipeline p1 for filling.

[0074] During subcooled filling: Start the liquid oxygen storage module P. After the liquid oxygen storage tank P1 pressurizes the tank through its own booster, liquid oxygen is transported to the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W through the liquid oxygen subcooler inlet pipeline w1. At the same time, liquid nitrogen is transported from the first liquid nitrogen storage module A to the liquid oxygen subcooler W1 through the first liquid nitrogen filling pipeline a1. Using liquid nitrogen as the subcooling carrier, the liquid oxygen at normal temperature of 91 - 95K is subcooled to the test requirement of 80 - 84K. The subcooled liquid oxygen is transported to the low-pressure liquid oxygen storage tank G1 through the liquid oxygen subcooler outlet pipeline w2 and the low-pressure liquid oxygen filling pipeline p1.

[0075] (2) Non-subcooled filling or subcooled filling of the low-pressure liquid methane storage tank G2 is carried out.

[0076] During subcooled filling: Start the liquid methane storage module R. After the liquid methane storage tank R1 pressurizes the tank through its built-in booster, the liquid methane is transported through the low-pressure liquid methane filling pipeline r2 to the low-pressure liquid methane storage tank G2 for filling.

[0077] During subcooled filling: Start the liquid methane storage module R. After the liquid methane storage tank R1 pressurizes the tank through its built-in booster, the liquid methane is transported through the liquid methane subcooler inlet pipeline v1 to the liquid methane subcooler V1 of the liquid methane subcooling module V. At the same time, the second liquid nitrogen storage module B transports liquid nitrogen to the liquid methane subcooler V1 through the third liquid nitrogen filling pipeline b1. Using liquid nitrogen as the subcooling carrier, the liquid methane at room temperature of 110 - 115K is subcooled to the test requirement of 100 - 105K. The subcooled liquid methane is transported to the low-pressure liquid methane storage tank G2 through the liquid methane subcooler outlet pipeline v2 and the low-pressure liquid methane filling pipeline r2.

[0078] (3)Perform gas distribution of the nitrogen gas distribution module D.

[0079] The high-pressure nitrogen gas cylinder group C4 provides the nitrogen source gas, which is transported to the first gas distribution plate D1 and the second gas distribution plate D2 through the nitrogen transportation main pipeline c1 respectively. The first boosting module E1 is connected through the first gas distribution plate D1 to pressurize the low-pressure liquid oxygen storage tank G1, and the second boosting module E2 is connected through the second gas distribution plate D2 to pressurize the low-pressure liquid methane storage tank G2. According to the demand of the test gas, by adjusting the pressure reducing valves on the first gas distribution plate D1 and the second gas distribution plate D2, the pressure of the gas used is adjusted to the reasonable gas distribution requirement.

[0080] (4)Conduct the ignition test of the 100-ton first engine m1 or the 120-ton second engine m2 in the low-pressure system.

[0081] 1) When conducting the ignition test of the 100-ton first engine m1 on the first test station M1 of the low-pressure system: Open the bottom valve of the low-pressure liquid oxygen storage tank G1. The liquid oxygen propellant is transported from the low-pressure liquid oxygen main pipeline g1 to the first low-pressure liquid oxygen branch pipeline g2. Open the first cut-off valve f1 and close the second cut-off valve f2 at the same time. The liquid oxygen is transported from the first low-pressure liquid oxygen branch pipeline g2 to the oxygen pump inlet of the first engine m1. The gasified gas generated when the low-pressure liquid oxygen main pipeline g1 and the first low-pressure liquid oxygen branch pipeline g2 are initially precooled is discharged to the atmosphere at high altitude by the first discharge module F1 at the top of the low-pressure liquid oxygen storage tank G1. At the same time, open the discharge valve of the first recovery pipeline g4 at the high point of the first low-pressure liquid oxygen branch pipeline g2 to conduct precooling exhaust of the pipeline to ensure that the pipeline is precooled in place. The first recovery pipeline g4 is discharged to the liquid oxygen recovery tank L1 through the fifth recovery pipeline h3.

[0082] Open the bottom valve of the low-pressure liquid methane storage tank G2. The liquid methane propellant is transported from the low-pressure liquid methane main pipeline g6 to the first low-pressure liquid methane branch pipeline g7. Open the third cut-off valve f3 and close the fourth cut-off valve f4 simultaneously. The liquid methane is transported from the first low-pressure liquid methane branch pipeline g7 to the methane pump inlet of the first engine m1. The vaporized gas generated at the beginning of the pre-cooling of the low-pressure liquid methane main pipeline g6 and the first low-pressure liquid methane branch pipeline g7 is discharged to the atmosphere at high altitude through the second discharge module F2 at the top of the low-pressure liquid methane storage tank G2. At the same time, open the discharge valve of the third recovery pipeline g9 at the high point of the first low-pressure liquid methane branch pipeline g7 to conduct pre-cooling exhaust of the pipeline to ensure that the pipeline is pre-cooled in place. The third recovery pipeline g9 discharges to the liquid methane recovery tank T1.

[0083] When the pipelines of the low-pressure liquid circuit module G are pre-cooled in place, close the exhaust valves in the first discharge module F1 and the second discharge module F2, as well as the discharge valves of the first recovery pipeline g4 and the third recovery pipeline g9. Provide distribution nitrogen through the first gas distribution plate D1 and transport it to the first pressurization module E1 through the first pressurized gas supply pipeline d1. Nitrogen pressurization of the low-pressure liquid oxygen storage tank G1 is carried out through the solenoid valve, orifice plate, and filter in the pressurization module. Provide distribution nitrogen through the second gas distribution plate D2 and transport it to the second pressurization module E2 through the second pressurized gas supply pipeline d2. Nitrogen pressurization of the low-pressure liquid methane storage tank G2 is carried out through the solenoid valve, orifice plate, and filter in the pressurization module. The pressurization pressures of the first pressurization module E1 and the second pressurization module E2 are both 5 MPa.

[0084] When the pressurization of the low-pressure liquid oxygen storage tank G1 and the low-pressure liquid methane storage tank G2 is stable, conduct the ignition test of the 100-ton first engine m1 in the low-pressure system. The generated gas is diverted to the diversion trough Y.

[0085] When the ignition test of the first engine m1 ends, nitrogen pressurization is carried out on the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 respectively. After pressurization, the liquid oxygen in the liquid oxygen recovery tank L1 is recovered into the liquid oxygen storage tank P1 of the liquid oxygen depot through pressurized extrusion, the seventh recovery pipeline i1, the high-pressure liquid oxygen filling pipeline p2, and the low-pressure liquid oxygen filling pipeline p1. After pressurization, the liquid methane in the liquid methane recovery tank T1 is recovered into the liquid methane storage tank R1 of the liquid methane depot through pressurized extrusion, the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2, and the high-pressure liquid methane filling pipeline r1.

[0086] 2) When conducting the ignition test of the 120-ton second engine m2 on the second test bench M2 of the low-pressure system: Open the bottom valve of the low-pressure liquid oxygen storage tank G1. The liquid oxygen propellant is transported from the low-pressure liquid oxygen main pipeline g1 to the second low-pressure liquid oxygen branch pipeline g3. Open the second cut-off valve f2 and close the first cut-off valve f1 simultaneously. The liquid oxygen is transported from the second low-pressure liquid oxygen branch pipeline g3 to the oxygen pump inlet of the second engine m2. The vaporized gas generated when the low-pressure liquid oxygen main pipeline g1 and the second low-pressure liquid oxygen branch pipeline g3 are initially pre-cooled is discharged to the atmosphere at high altitude through the first discharge module F1 at the top of the low-pressure liquid oxygen storage tank G1. At the same time, open the discharge valve of the second recovery pipeline g5 at the high point of the second low-pressure liquid oxygen branch pipeline g3 to conduct pre-cooling exhaust of the pipeline to ensure that the pipeline is pre-cooled in place. The second recovery pipeline g5 is discharged to the liquid oxygen recovery tank L1 through the fifth recovery pipeline h3.

[0087] Open the bottom valve of the low-pressure liquid methane storage tank G2. The liquid methane propellant is transported from the low-pressure liquid methane main pipeline g6 to the second low-pressure liquid methane branch pipeline g8. Open the fourth cut-off valve f4 and close the third cut-off valve f3 simultaneously. The liquid methane is transported from the second low-pressure liquid methane branch pipeline g8 to the methane pump inlet of the second engine m2. The vaporized gas generated when the low-pressure liquid methane main pipeline g6 and the second low-pressure liquid methane branch pipeline g8 are initially pre-cooled is discharged to the atmosphere at high altitude through the second discharge module F2 at the top of the low-pressure liquid methane storage tank G2. At the same time, open the discharge valve of the fourth recovery pipeline g10 at the high point of the second low-pressure liquid methane branch pipeline g8 to conduct pre-cooling exhaust of the pipeline to ensure that the pipeline is pre-cooled in place. The fourth recovery pipeline g10 is discharged to the liquid methane recovery tank T1 through the third recovery pipeline g9.

[0088] When the pipelines of the low-pressure liquid path module G are pre-cooled in place, close the exhaust valves in the first discharge module F1 and the second discharge module F2, as well as the discharge valves of the second recovery pipeline g5 and the fourth recovery pipeline g10. Provide distribution nitrogen through the first gas distribution plate D1 and transport it to the first pressurization module E1 through the first pressurized air supply pipeline d1. Nitrogen pressurization of the low-pressure liquid oxygen storage tank G1 is carried out through the solenoid valve, orifice plate, and filter in the pressurization module. Provide distribution nitrogen through the second gas distribution plate D2 and transport it to the second pressurization module E2 through the second pressurized air supply pipeline d2. Nitrogen pressurization of the low-pressure liquid methane storage tank G2 is carried out through the solenoid valve, orifice plate, and filter in the pressurization module. The pressurization pressures of the first pressurization module E1 and the second pressurization module E2 are both 5 MPa.

[0089] When the pressurization of the low-pressure liquid oxygen storage tank G1 and the low-pressure liquid methane storage tank G2 is stable, conduct an ignition test of the second engine m2 with a low-pressure system of 120 tons. The gas generated by the test is diverted to the diversion trough Y.

[0090] When the ignition test of the second engine m2 ends, nitrogen is used to pressurize the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 respectively. After pressurization, the liquid oxygen in the liquid oxygen recovery tank L1 is recovered into the liquid oxygen storage tank P1 through pressurized extrusion via the seventh recovery pipeline i1, the high-pressure liquid oxygen filling pipeline p2, and the low-pressure liquid oxygen filling pipeline p1. After pressurization, the liquid methane in the liquid methane recovery tank T1 is recovered into the liquid methane storage tank R1 through pressurized extrusion via the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2, and the high-pressure liquid methane filling pipeline r1.

[0091] 3. When conducting the high-pressure test run of liquid oxygen and methane: (1) Conduct non-subcooled filling or subcooled filling of the high-pressure liquid oxygen storage tank H1.

[0092] During non-subcooled filling: Start the liquid oxygen storage module P. After the liquid oxygen storage tank P1 pressurizes the storage tank through its built-in booster, the liquid oxygen is transported to the high-pressure liquid oxygen storage tank H1 for filling through the high-pressure liquid oxygen filling pipeline p2.

[0093] During subcooled filling: Start the liquid oxygen storage module P. After the liquid oxygen storage tank P1 pressurizes the storage tank through its built-in booster, the liquid oxygen is transported through the liquid oxygen subcooler inlet pipeline w1 to the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W. At the same time, liquid nitrogen is transported from the first liquid nitrogen storage module A to the liquid oxygen subcooler W1 through the first liquid nitrogen filling pipeline a1. Using liquid nitrogen as the subcooling medium, the liquid oxygen at normal temperature of 91 - 95K is subcooled to the test requirement of 80 - 84K. The subcooled liquid oxygen is transported to the high-pressure liquid oxygen storage tank H1 through the liquid oxygen subcooler outlet pipeline w2 and the high-pressure liquid oxygen filling pipeline p2.

[0094] (2) Conduct non-subcooled filling or subcooled filling of the high-pressure liquid methane storage tank H2.

[0095] During non-subcooled filling: Start the liquid methane storage module R. After the liquid methane storage tank R1 pressurizes the storage tank through its built-in booster, the liquid methane is transported to the high-pressure liquid methane storage tank H2 for filling through the high-pressure liquid methane filling pipeline r1.

[0096] During subcooled filling: Start the liquid methane storage module R. After the liquid methane storage tank R1 pressurizes the storage tank through its built-in booster, the liquid methane is transported through the liquid methane subcooler inlet pipeline v1 to the liquid methane subcooler V1 of the liquid methane subcooling module V. At the same time, liquid nitrogen is transported from the second liquid nitrogen storage module B to the liquid methane subcooler V1 through the third liquid nitrogen filling pipeline b1. Using liquid nitrogen as the subcooling medium, the liquid methane at normal temperature of 110 - 115K is subcooled to the test requirement of 100 - 105K. The subcooled liquid methane is transported to the high-pressure liquid methane storage tank H2 through the liquid methane subcooler outlet pipeline v2 and the high-pressure liquid methane filling pipeline r1.

[0097] (3) Conduct gas distribution of the nitrogen gas distribution system D.

[0098] Nitrogen source gas is provided by the high-pressure nitrogen cylinder group C4 and is respectively transported to the third gas distribution plate D3 and the fourth gas distribution plate D4 through the main nitrogen transport pipeline c1. The third gas distribution plate D3 is connected to the third pressurization module E3 to pressurize the high-pressure liquid oxygen storage tank H1, and the fourth gas distribution plate D4 is connected to the fourth pressurization module E4 to pressurize the high-pressure liquid methane storage tank H2. According to the demand of test gas, by adjusting the pressure reducing valves on the third gas distribution plate D3 and the fourth gas distribution plate D4, the gas pressure is adjusted to a reasonable gas distribution requirement.

[0099] (4)When conducting the ignition test of the engine assembly m3 at the 30-ton test station of the high-pressure system: Open the bottom valve of the high-pressure liquid oxygen storage tank H1, and the liquid oxygen propellant is transported to the oxygen pump inlet of the third engine m3 through the main high-pressure liquid oxygen pipeline h1. The gasified gas generated when the main high-pressure liquid oxygen pipeline h1 starts to be precooled is discharged to the atmosphere at high altitude by the third discharge module F3 at the top of the high-pressure liquid oxygen storage tank H1. At the same time, open the discharge valve of the fifth recovery pipeline h3 at the high point of the main high-pressure liquid oxygen pipeline h1 to conduct precooling exhaust of the pipeline to ensure that the pipeline is fully precooled. The fifth recovery pipeline h3 discharges into the liquid oxygen recovery tank L1.

[0100] Open the bottom valve of the high-pressure liquid methane storage tank H2, and the liquid methane propellant is transported to the methane pump inlet of the third engine m3 through the main high-pressure liquid methane pipeline h2. The gasified gas generated when the main high-pressure liquid methane pipeline h2 starts to be precooled is discharged to the atmosphere at high altitude by the fourth discharge module F4 at the top of the high-pressure liquid methane storage tank H2. At the same time, open the discharge valve of the sixth recovery pipeline h4 at the high point of the main high-pressure liquid methane pipeline h2 to conduct precooling exhaust of the pipeline to ensure that the pipeline is fully precooled. The sixth recovery pipeline h4 is discharged into the liquid methane recovery tank T1 through the third recovery pipeline g9.

[0101] After the pipelines of the high-pressure liquid circuit module H are fully precooled, close the exhaust valves in the third discharge module F3 and the fourth discharge module F4, as well as the discharge valves of the fifth recovery pipeline h3 and the sixth recovery pipeline h4. Provide distribution nitrogen through the third gas distribution plate D3, which is transported to the third pressurization module E3 through the third pressurized gas supply pipeline d3. The high-pressure liquid oxygen storage tank H1 is pressurized with nitrogen through the solenoid valve, orifice plate and filter in the pressurization system. Provide distribution nitrogen through the fourth gas distribution plate D4, which is transported to the fourth pressurization module E4 through the fourth pressurized gas supply pipeline d4. The high-pressure liquid methane storage tank H2 is pressurized with nitrogen through the solenoid valve, orifice plate and filter in the pressurization system. The pressurization pressures of the third pressurization module E3 and the fourth pressurization module E4 are both 23 MPa.

[0102] After the pressurization of the high-pressure liquid oxygen storage tank H1 and the high-pressure liquid methane storage tank H2 is stable, conduct the ignition test of the third engine m3 at the 30-ton level of the high-pressure system, and the generated gas is drained into the diversion trough Y.

[0103] When the ignition test of the third engine m3 is completed, nitrogen is used to pressurize the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 respectively. After pressurization, the liquid oxygen in the liquid oxygen recovery tank L1 is recovered into the liquid oxygen storage tank P1 through pressurized extrusion via the seventh recovery pipeline i1, the high-pressure liquid oxygen filling pipeline p2, and the low-pressure liquid oxygen filling pipeline p1. After pressurization, the liquid methane in the liquid methane recovery tank T1 is recovered into the liquid methane storage tank R1 through pressurized extrusion via the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2, and the high-pressure liquid methane filling pipeline r1.

[0104] The above is only a schematic specific embodiment of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by any person skilled in the art shall fall within the scope of protection of the present invention.

Claims

1. A liquid oxygen-methane engine test stand composed of a multi-functional test system, characterized in that, The test stand includes a gas circuit system, a liquid circuit system, and a test station. Among them, the gas circuit system is connected to the liquid circuit system through pipelines to supply gas, and the liquid circuit system is connected to the test station to provide the liquid fuel required for testing at the test station; the gas circuit system includes: a first liquid nitrogen tank module (A), a second liquid nitrogen tank module (B), a gas generation module (C), and a gas distribution module (D). Among them, the first liquid nitrogen tank module (A) is connected to the gas generation module (C) through pipelines to generate gas, and the gas generation module (C) is connected to the gas distribution module (D) through pipelines to distribute gas for the liquid circuit system; the liquid circuit system includes: a low-pressure liquid circuit module (G), a high-pressure liquid circuit module (H), a liquid oxygen tank module (P), a liquid methane tank module (R), a liquid oxygen subcooling module (W), and a liquid methane subcooling module (V). Among them, the first liquid nitrogen tank module (A) is connected to the liquid oxygen subcooling module (W) through pipelines to provide a subcoolant, the liquid oxygen tank module (P) is connected to the liquid oxygen subcooling module (W) through pipelines to subcool liquid oxygen, and the liquid oxygen subcooling module (W) is connected to the low-pressure liquid circuit module (G) and the high-pressure liquid circuit module (H) through pipelines to provide subcooled liquid oxygen; the second liquid nitrogen tank module (B) is connected to the liquid methane subcooling module (V) through pipelines to provide a subcoolant, the liquid methane tank module (R) is connected to the liquid methane subcooling module (V) through pipelines to subcool liquid methane, and the liquid methane subcooling module (V) is connected to the low-pressure liquid circuit module (G) and the high-pressure liquid circuit module (H) through pipelines to provide subcooled liquid methane; the low-pressure liquid circuit module (G) and the high-pressure liquid circuit module (H) are respectively connected to the test station.

2. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 1, characterized in that, The liquid circuit system further includes: a liquid oxygen recovery module (L) and a liquid methane recovery module (T). Among them, the liquid oxygen recovery module (L) is connected to the low-pressure liquid circuit module (G) and the high-pressure liquid circuit module (H) through pipelines to recover liquid oxygen in the pipelines; the liquid methane recovery module (T) is connected to the low-pressure liquid circuit module (G) and the high-pressure liquid circuit module (H) through pipelines to recover liquid methane in the pipelines.

3. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 2, characterized in that, The low-pressure liquid circuit module (G) includes: a low-pressure liquid oxygen storage tank (G1) and a low-pressure liquid methane storage tank (G2). Among them, the subcooled liquid oxygen in the liquid oxygen subcooler (W1) of the liquid oxygen subcooling module (W) is transported to the low-pressure liquid oxygen storage tank (G1) through the liquid oxygen subcooler outlet pipeline (w2) and the low-pressure liquid oxygen filling pipeline (p1); the subcooled liquid methane in the liquid methane subcooler (V1) of the liquid methane subcooling module (V) is transported to the low-pressure liquid methane storage tank (G2) through the liquid methane subcooler outlet pipeline (v2) and the low-pressure liquid methane filling pipeline (r2); the upper part of the low-pressure liquid oxygen storage tank (G1) is connected to the gas distribution module (D) through the first pressurization module (E1) for gas distribution pressurization and is depressurized through the first discharge module (F1); the lower part of the low-pressure liquid oxygen storage tank (G1) is connected to the first test station (M1) through the low-pressure liquid oxygen main pipeline (g1) and the first low-pressure liquid oxygen branch pipeline (g2); The lower part of the low-pressure liquid oxygen storage tank (G1) is connected to the second test bench (M2) through the low-pressure liquid oxygen main pipeline (g1) and the second low-pressure liquid oxygen branch pipeline (g3); The upper part of the low-pressure liquid methane storage tank (G2) is connected to the gas distribution module (D) through the second pressurization module (E2) for gas distribution and pressurization, and pressure relief is carried out through the second discharge module (F2); The lower part of the low-pressure liquid methane storage tank (G2) is connected to the first test bench (M1) through the low-pressure liquid methane main pipeline (g6) and the first low-pressure liquid methane branch pipeline (g7); The lower part of the low-pressure liquid methane storage tank (G2) is connected to the second test bench (M2) through the low-pressure liquid methane main pipeline (g6) and the second low-pressure liquid methane branch pipeline (g8).

4. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 3, characterized in that, The upstream of the first low-pressure liquid oxygen branch pipeline (g2) is connected to the liquid oxygen recovery module (L) through the first recovery pipeline (g4) and the fifth recovery pipeline (h3); The upstream of the second low-pressure liquid oxygen branch pipeline (g3) is connected to the liquid oxygen recovery module (L) through the second recovery pipeline (g5) and the fifth recovery pipeline (h3); The upstream of the first low-pressure liquid methane branch pipeline (g7) is connected to the liquid methane recovery module (T) through the third recovery pipeline (g9); The upstream of the second low-pressure liquid methane branch pipeline (g8) is connected to the liquid methane recovery module (T) through the fourth recovery pipeline (g10) and the third recovery pipeline (g9).

5. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 3, characterized in that, The high-pressure liquid path module (H) includes: a high-pressure liquid oxygen storage tank (H1) and a high-pressure liquid methane storage tank (H2), where The liquid oxygen supercooled in the liquid oxygen subcooler (W1) of the liquid oxygen subcooling module (W) is transported to the high-pressure liquid oxygen storage tank (H1) through the liquid oxygen subcooler outlet pipeline (w2) and the high-pressure liquid oxygen filling pipeline (p2); The liquid methane supercooled in the liquid methane subcooler (V1) of the liquid methane subcooling module (V) is transported to the high-pressure liquid methane storage tank (H2) through the liquid methane subcooler outlet pipeline (v2) and the high-pressure liquid methane filling pipeline (r1); The upper part of the high-pressure liquid oxygen storage tank (H1) is connected to the gas distribution module (D) through the third pressurization module (E3) for gas distribution and pressurization, and pressure relief is carried out through the third discharge module (F3); The lower part of the high-pressure liquid oxygen storage tank (H1) is connected to the third test bench (M3) through the high-pressure liquid oxygen main pipeline (h1); The upper part of the high-pressure liquid methane storage tank (H2) is connected to the gas distribution module (D) through the fourth pressurization module (E4) for gas distribution and pressurization, and pressure relief is carried out through the fourth discharge module (F4); The lower part of the high-pressure liquid methane storage tank (H2) is connected to the third test bench (M3) through the high-pressure liquid methane main pipeline (h2).

6. The liquid oxygen-methane engine test stand composed of a multi-functional test system according to claim 5, characterized in that, The upstream of the high-pressure liquid oxygen main pipeline (h1) is connected to the liquid oxygen recovery module (L) through the fifth recovery pipeline (h3); The upstream of the high-pressure liquid methane main pipeline (h2) is connected to the liquid methane recovery module (T) through the sixth recovery pipeline (h4) and the third recovery pipeline (g9).

7. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 4 or 6, characterized in that The liquid oxygen recovery module (L) includes a liquid oxygen recovery tank (L1), the bottom of which is connected to the liquid oxygen storage module (P) through a seventh recovery pipeline (i1); The liquid methane recovery module (T) includes a liquid methane recovery tank (T1), the bottom of which is connected to the liquid methane storage module (R) through an eighth recovery pipeline (i2).

8. The liquid oxygen-methane engine test stand composed of a multi-functional test system according to claim 5, characterized in that, 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 gas cylinder group (C4), where The liquid nitrogen in the first liquid nitrogen storage module (A) is filled into the liquid nitrogen storage tank (C1) through a second liquid nitrogen filling pipeline (a2), pumped into the liquid nitrogen vaporizer (C3) by the liquid nitrogen plunger pump (C2) for gasification, and the gasified nitrogen is stored in the high-pressure nitrogen gas cylinder group (C4); The high-pressure nitrogen gas cylinder group (C4) is transported to the nitrogen gas distribution module (D) through a nitrogen gas main transport pipeline (c1).

9. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 8, characterized in that, The nitrogen gas 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 nitrogen gas main transport pipeline (c1), where The first distribution plate (D1) is connected to the first pressurization module (E1) through a first pressurized gas supply pipeline (d1) for pressurized gas supply; The second distribution plate (D2) is connected to the second pressurization module (E2) through a second pressurized gas supply pipeline (d2) for pressurized gas supply; The third distribution plate (D3) is connected to the third pressurization module (E3) through a third pressurized gas supply pipeline (d3) for pressurized gas supply; The fourth distribution plate (D4) is connected to the fourth pressurization module (E4) through a fourth pressurized gas supply pipeline (d4) for pressurized gas supply.

10. The liquid oxygen methane engine test stand composed of a multi-functional test system according to claim 3, characterized in that, The liquid nitrogen in the first liquid nitrogen storage module (A) provides a subcoolant for the liquid oxygen subcooler (W1) through a first liquid nitrogen filling pipeline (a1), and the liquid oxygen storage module (P) transports liquid oxygen to the liquid oxygen subcooler (W1) through a liquid oxygen subcooler inlet pipeline (w1) for liquid oxygen subcooling; The liquid nitrogen in the second liquid nitrogen storage module (B) provides a subcoolant for the liquid methane subcooler (V1) through a third liquid nitrogen filling pipeline (b1), and the liquid methane storage module (R) transports liquid methane to the liquid methane subcooler (V1) through a liquid methane subcooler inlet pipeline (v1) for liquid methane subcooling.

Images