A liquid oxygen-methane engine test stand composed of a multifunctional test system

Abstract

The application provides a liquid oxygen-methane engine test stand composed of a multifunctional test system, which comprises a gas path system, a liquid path system and a test station. The gas path system and the liquid path system are connected by pipelines for gas supply, and the liquid path system is connected with the test station for providing liquid fuel required by the test station. The liquid path system comprises a low-pressure liquid path module and a high-pressure liquid path module. The low-pressure liquid path module and the high-pressure liquid path module are respectively connected with the test station. The test stand is composed of one set of gas path system, two sets of liquid path system and three test stations. The two sets of liquid path system jointly use one set of gas path system for gas supply, so that the medium can be transported to the three test stations according to the requirement, the test stand can meet the gas distribution requirement of different types of engines, the resource sharing of the test equipment is improved, and the total cost of equipment construction and maintenance is greatly reduced, and the efficiency of engine test is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rocket engine test stand, in particular to a liquid oxygen and methane engine test stand composed of a multifunctional test system. BACKGROUND

[0002] In the field of commercial spaceflight, the technology of liquid oxygen / methane carrier rocket develops very rapidly, and the main core to ensure the successful launch of the liquid oxygen / methane carrier rocket is to have a reliable liquid oxygen / methane carrier rocket engine. The development, performance optimization, reliability and innovation of the liquid oxygen / methane carrier rocket engine all need to use the liquid oxygen / methane carrier rocket engine test stand to test and verify.

[0003] The test stand is a key facility in the development process of the rocket engine. According to the saying in the industry, the rocket engine is designed and tested. The design and process feasibility of the engine are verified through testing, and the development goal is achieved through multiple rounds of improvement and optimization. Generally, the development of the rocket engine needs to be tested for at least 20,000 seconds. In addition, in the early stage of engine development, test design is carried out in combination with the demonstration of product design scheme and task requirements, and it is ensured that all technical and management risks and their impact and consequences are controlled within the specified acceptable range.

[0004] At present, the test system composition of the liquid oxygen / methane carrier rocket engine test stand involved in the field of spaceflight is relatively simple and independent, and is roughly divided into a liquid oxygen and methane low-temperature and low-pressure system and a liquid oxygen and methane low-temperature and high-pressure system. Both of the two test systems need to be built separately to achieve a test stand. The test system of the test stand using this mode needs to be separated by a large safety distance during construction, resulting in a large test area and a high construction cost, and some equipment and facilities need to be repeatedly constructed, thereby increasing the land area, the investment and maintenance cost of equipment and facilities. At the same time, the development of the liquid oxygen / methane engine involves multiple stages and various types of test projects, and the single test system of the engine test stand is difficult to meet and adapt to the development requirements of multiple stages of the engine.

[0005] Therefore, it is urgent to build an engine test stand that can meet the development of the liquid oxygen / methane engine in multiple stages, various types, different sizes and application scenarios, and can reduce the investment and construction cost. SUMMARY

[0006] The present application aims to overcome the shortcomings of the prior art and provide a liquid oxygen and methane engine test stand composed of a multifunctional test system to solve the problem that the engine test stand in the prior art cannot meet the test requirements of various types, different sizes and different application scenarios and has a high construction cost.

[0007] The application provides a liquid oxygen-methane engine test stand composed of a multifunctional test system, which comprises a gas path system, a liquid path system and a test site, wherein the gas path system is connected with the liquid path system through pipelines to supply gas, the liquid path system is connected with the test site to provide liquid fuel required by the test site; the gas path system comprises a first liquid nitrogen storage module, a second liquid nitrogen storage module, a gas production module and a gas distribution module, wherein the first liquid nitrogen storage module is connected with the gas production module through pipelines to produce gas, the gas production module is connected with the gas distribution module through pipelines to supply gas to the liquid path system; the liquid path system comprises a low-pressure liquid path module and a high-pressure liquid path module, a liquid oxygen storage module, a liquid methane storage module, a liquid oxygen supercooling module and a liquid methane supercooling module, wherein the first liquid nitrogen storage module is connected with the liquid oxygen supercooling module through pipelines to provide supercooling agent, the liquid oxygen storage module is connected with the liquid oxygen supercooling module through pipelines to supercool liquid oxygen, the liquid oxygen supercooling module is connected with the low-pressure liquid path module and the high-pressure liquid path module through pipelines to provide supercooled liquid oxygen; the second liquid nitrogen storage module is connected with the liquid methane supercooling module through pipelines to provide supercooling agent, the liquid methane storage module is connected with the liquid methane supercooling module through pipelines to supercool liquid methane, the liquid methane supercooling module is connected with the low-pressure liquid path module and the high-pressure liquid path module through pipelines to provide supercooled liquid methane; the low-pressure liquid path module and the high-pressure liquid path module are respectively connected with the test site.

[0008] In the embodiment of the application, the liquid path system further comprises a liquid oxygen recovery module and a liquid methane recovery module, wherein the liquid oxygen recovery module is connected with the low-pressure liquid path module and the high-pressure liquid path module through pipelines to recover liquid oxygen in pipelines; the liquid methane recovery module is connected with the low-pressure liquid path module and the high-pressure liquid path module through pipelines to recover liquid methane in pipelines.

[0009] Further, the low-pressure liquid path module comprises: a low-pressure liquid oxygen storage tank and a low-pressure liquid methane storage tank, wherein the liquid oxygen overcooled in the liquid oxygen overcooler of the liquid oxygen overcooling module is transported into the low-pressure liquid oxygen storage tank through a liquid oxygen overcooler outflow pipeline and a low-pressure liquid oxygen filling pipeline; the liquid methane overcooled in the liquid methane overcooler of the liquid methane overcooling module is transported into the low-pressure liquid methane storage tank through a liquid methane overcooler outflow pipeline and a low-pressure liquid methane filling pipeline; the upper portion of the low-pressure liquid oxygen storage tank is connected to the gas distribution module through a first pressurization module for gas distribution pressurization and is connected to a first discharge module for pressure relief; the lower portion of the low-pressure liquid oxygen storage tank is connected to the first test site through a low-pressure liquid oxygen main pipeline and a first low-pressure liquid oxygen branch pipeline; the lower portion of the low-pressure liquid oxygen storage tank is connected to the second test site through a low-pressure liquid oxygen main pipeline and a second low-pressure liquid oxygen branch pipeline; the upper portion of the low-pressure liquid methane storage tank is connected to the gas distribution module through a second pressurization module for gas distribution pressurization and is connected to a second discharge module for pressure relief; the lower portion of the low-pressure liquid methane storage tank is connected to the first test site through a low-pressure liquid methane main pipeline and a first low-pressure liquid methane branch pipeline; the lower portion of the low-pressure liquid methane storage tank is connected to the second test site through a low-pressure liquid methane main pipeline and a second low-pressure liquid methane branch pipeline.

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

[0011] Further, the high-pressure liquid path module comprises: a high-pressure liquid oxygen storage tank and a high-pressure liquid methane storage tank, wherein the liquid oxygen overcooled in the liquid oxygen overcooler of the liquid oxygen overcooling module is transported into the high-pressure liquid oxygen storage tank through a liquid oxygen overcooler outflow pipeline and a high-pressure liquid oxygen filling pipeline; the liquid methane overcooled in the liquid methane overcooler of the liquid methane overcooling module is transported into the high-pressure liquid methane storage tank through a liquid methane overcooler outflow pipeline and a high-pressure liquid methane filling pipeline; the upper portion of the high-pressure liquid oxygen storage tank is connected to the gas distribution module through a third pressurization module for gas distribution pressurization and is connected to a third discharge module for pressure relief; the lower portion of the high-pressure liquid oxygen storage tank is connected to a third test site through a high-pressure liquid oxygen main pipeline; the upper portion of the high-pressure liquid methane storage tank is connected to the gas distribution module through a fourth pressurization module for gas distribution pressurization and is connected to a fourth discharge module for pressure relief; the lower portion of the high-pressure liquid methane storage tank is connected to the third test site through a high-pressure liquid methane main pipeline.

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

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

[0014] In the embodiment of the present application, the gas production module comprises a liquid nitrogen storage tank, a liquid nitrogen plunger pump, a liquid nitrogen vaporizer, and a high-pressure nitrogen cylinder group, wherein 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 through the liquid nitrogen plunger pump for gasification, and the gasified nitrogen is stored in the high-pressure nitrogen cylinder group; and the high-pressure nitrogen cylinder group is delivered to the nitrogen gas distribution module through a nitrogen gas delivery main pipeline.

[0015] Further, the nitrogen gas distribution module comprises 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 delivery main pipeline, wherein the first gas distribution plate is connected to the first pressure boosting module through a first pressure boosting gas supply pipeline for pressure boosting gas supply; the second gas distribution plate is connected to the second pressure boosting module through a second pressure boosting gas supply pipeline for pressure boosting gas supply; the third gas distribution plate is connected to the third pressure boosting module through a third pressure boosting gas supply pipeline for pressure boosting gas supply; and the fourth gas distribution plate is connected to the fourth pressure boosting module through a fourth pressure boosting gas supply pipeline for pressure boosting gas supply.

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

[0017] According to the above-mentioned embodiments, the liquid oxygen methane engine test bench composed of the multifunctional test system provided by the present application has at least the following advantages:

[0018] The liquid oxygen-methane engine test stand of the multifunctional test system is composed of a gas path system, two liquid path systems and three test stations. The two liquid path systems include a low-pressure liquid path module and a high-pressure liquid path module, and the two liquid path systems jointly use a set of gas path systems for gas supply, so that the medium can be delivered to the three test stations according to the requirements, the test stand can meet the gas supply requirements of different types of engines, the resource sharing of the test equipment is improved, and the total cost of equipment construction and maintenance is greatly reduced, and the efficiency of engine testing is improved.

[0019] In addition, the multifunctional test system can adapt to the test requirements of engines of different sizes by adjusting some structures and parameters of the test stand, simulate different application scenarios, and test the engines in a targeted manner to ensure the reliability and adaptability of the engines and improve the overall utilization rate of the test stand.

[0020] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the scope of the invention claimed. BRIEF DESCRIPTION OF DRAWINGS

[0021] The following drawings are part of the specification of the present application, which illustrates the example embodiments of the present application, and the accompanying drawings and the description of the specification are used to illustrate the principles of the present application.

[0022] Fig. 1 A system structure diagram of a liquid oxygen-methane engine test stand composed of a multifunctional test system is provided.

[0023] Fig. 2 A partial enlarged view of a low-pressure liquid path module of a liquid oxygen-methane engine test stand composed of a multifunctional test system is provided.

[0024] Fig. 3 A partial enlarged view of a high-pressure liquid path module of a liquid oxygen-methane engine test stand composed of a multifunctional test system is provided.

[0025] Explanation of reference signs:

[0026] A-First liquid nitrogen storage module, B-Second liquid nitrogen storage module, C-Gas production module, D-Nitrogen gas distribution module, G-Low-pressure liquid path module, H-High-pressure liquid path 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-Flow guide groove;

[0027] A1-First liquid nitrogen storage tank, B1-Second liquid nitrogen storage tank;

[0028] C1-Liquid nitrogen storage tank, C2-Liquid nitrogen plunger pump, C3-Liquid nitrogen vaporizer, C4-High-pressure nitrogen cylinder group;

[0029] D1 - first distribution plate, D2 - second distribution plate, D3 - third distribution plate, D4 - fourth distribution plate;

[0030] E1 - first booster module, E2 - second booster module, E3 - third booster module, E4 - fourth booster module;

[0031] F1 - first exhaust module, F2 - second exhaust module, F3 - third exhaust module, F4 - fourth exhaust module;

[0032] G1 - low-pressure liquid oxygen tank, G2 - low-pressure liquid methane tank, H1 - high-pressure liquid oxygen tank, H2 - high-pressure liquid methane tank;

[0033] L1 - liquid oxygen recovery tank, T1 - liquid methane recovery tank;

[0034] M1 - first test run station, M2 - second test run station, M3 - third test run station;

[0035] P1 - liquid oxygen storage tank, R1 - liquid methane storage tank, V1 - liquid methane subcooler, W1 - liquid oxygen subcooler;

[0036] a1 - first liquid nitrogen filling pipeline, a2 - second liquid nitrogen filling pipeline, b1 - third liquid nitrogen filling pipeline, c1 - nitrogen gas delivery main pipeline, d1 - first booster gas delivery pipeline, d2 - second booster gas delivery pipeline, d3 - third booster gas delivery pipeline, d4 - fourth booster gas delivery pipeline, f1 - first shut-off valve, f2 - second shut-off valve, f3 - third shut-off valve, f4 - fourth shut-off valve;

[0037] g1 - low-pressure liquid oxygen main 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 - low-pressure liquid methane main 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;

[0038] h1 - high-pressure liquid oxygen main pipeline, h2 - high-pressure liquid methane main pipeline, h3 - third recovery pipeline, h4 - sixth recovery pipeline, i1 - seventh recovery pipeline, i2 - eighth recovery pipeline;

[0039] m1 - first engine, m2 - second engine, m3 - third engine;

[0040] 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 subcooler liquid inlet pipeline, v2 - liquid methane subcooler liquid outlet pipeline, w1 - liquid oxygen subcooler liquid inlet pipeline, w2 - liquid oxygen subcooler liquid outlet pipeline. DETAILED DESCRIPTION

[0041] The detailed description of the present application is described in detail, which should not be considered as a limitation of the present application, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present application.

[0042] Many modifications and variations of the specific implementation of the present application described in the specification can be made without departing from the scope or spirit of the present application, which will be apparent to those skilled in the art. Other implementations derived from the specification of the present application are apparent to the skilled person. The specification and examples of the present application are only exemplary.

[0043] The present application provides a liquid oxygen methane engine test stand composed of a multifunctional test system, as shown in Figs. 1-3 The system connection structure diagram of the test stand is shown. In the specific implementation, the test stand includes a gas path system, a liquid path system and a test site. The gas path system and the liquid path system are connected by a pipeline to supply gas, and the liquid path system is connected with the test site to provide liquid fuel required for testing. In this embodiment, a set of gas path system, two sets of liquid path system and three test sites are included. The three test sites are divided into two low-pressure test sites of 100-ton engine and 120-ton engine and one high-pressure test site of 30-ton engine. In addition, a flow guide groove Y is arranged at the lower part of the test site. The flow guide groove Y is an inclined water storage type flow guide groove, which is used to guide the combustion gas generated during the test of the rocket engine of the three test sites and reduce the noise pollution. The inclined water storage type flow guide groove has a simpler structure and lower construction cost than the vertical flow guide groove.

[0044] Specifically, the gas path system includes a first liquid nitrogen storage module A, a second liquid nitrogen storage module B, a gas making module C and a gas distribution module D. The first liquid nitrogen storage module A is connected by a pipeline to the gas making module C for gas making, and the gas making module C is connected by a pipeline to the gas distribution module D for gas distribution for the liquid path system.

[0045] In the embodiment, the liquid path system comprises: a low-pressure liquid path module G and a high-pressure liquid path module H, a liquid oxygen storage module P, a liquid methane storage module R, a liquid oxygen supercooling module W, and a liquid methane supercooling module V. The first liquid nitrogen storage module A is connected to the liquid oxygen supercooling module W through a pipeline to provide a supercooling agent, the liquid oxygen storage module P is connected to the liquid oxygen supercooling module W through a pipeline to supercool liquid oxygen, and the liquid oxygen supercooling module W is connected to the low-pressure liquid path module G and the high-pressure liquid path module H through pipelines to provide supercooled liquid oxygen.

[0046] The second liquid nitrogen storage module B is connected to the liquid methane supercooling module V through a pipeline to provide a supercooling agent, the liquid methane storage module R is connected to the liquid methane supercooling module V through a pipeline to supercool liquid methane, and the liquid methane supercooling module V is connected to the low-pressure liquid path module G and the high-pressure liquid path module H through pipelines to provide supercooled liquid methane.

[0047] The low-pressure liquid path module G and the high-pressure liquid path module H are respectively connected to a test run station. In the embodiment, the low-pressure liquid path module G is connected to two test run stations, which are two low-pressure test run stations for a 100-ton engine and a 120-ton engine.

[0048] The high-pressure liquid path module H is connected to one test run station, which is a high-pressure test run station for a 30-ton engine.

[0049] In the embodiment, the liquid path system further comprises: a liquid oxygen recovery module L and a liquid methane recovery module T. 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 to recover liquid oxygen in the pipeline.

[0050] 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 to recover liquid methane in the pipeline.

[0051] In the embodiment, the low-pressure liquid path module G comprises: a low-pressure liquid oxygen storage tank G1 and a low-pressure liquid methane storage tank G2. Liquid oxygen that is supercooled in the liquid oxygen supercooler W1 of the liquid oxygen supercooling module W is transported to the low-pressure liquid oxygen storage tank G1 through a liquid oxygen supercooler outlet pipeline w2 and a low-pressure liquid oxygen filling pipeline p1 for subsequent oxygen used in tests.

[0052] Liquid methane that is supercooled in the liquid methane supercooler V1 of the liquid methane supercooling module V is transported to the low-pressure liquid methane storage tank G2 through a liquid methane supercooler outlet pipeline v2 and a low-pressure liquid methane filling pipeline r2 for subsequent methane used in tests.

[0053] 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 an electromagnetic valve, a flow limiting orifice plate, and a filter. In addition, the pressurization module is provided with two pressurization paths to improve the pressurization efficiency and safety. The electromagnetic valve and the flow limiting orifice plate are arranged on the two pressurization branches along the gas flow direction, and the filter is arranged on the downstream merging main path.

[0054] In this embodiment, the first discharge module F1 is used for discharging and depressurizing the low-pressure liquid oxygen tank G1, and includes a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, and a silencer.

[0055] The lower part of the low-pressure liquid oxygen storage tank G1 is connected to the first engine m1 in the first test bench M1 through the low-pressure liquid oxygen main pipeline g1 and the first low-pressure liquid oxygen branch pipeline g2 for delivering liquid oxygen to the first engine m1.

[0056] The lower part of the low-pressure liquid oxygen storage tank G1 is connected to the second engine m2 in the second test bench M2 through the low-pressure liquid oxygen main pipeline g1 and the second low-pressure liquid oxygen branch pipeline g3 for delivering liquid oxygen to the second engine m2.

[0057] 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 is depressurized through the second discharge module F2. In this embodiment, the second pressurization module E2 includes an electromagnetic valve, a flow limiting orifice plate, and a filter. In addition, the pressurization module is provided with two pressurization paths to improve the pressurization efficiency and safety. The electromagnetic valve and the flow limiting orifice plate are arranged on the two pressurization branches along the gas flow direction, and the filter is arranged on the downstream merging main path.

[0058] In this embodiment, the second discharge module F2 is used for discharging and depressurizing the low-pressure liquid methane tank G2, and includes a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, and a silencer.

[0059] The lower part of the low-pressure liquid methane storage tank G2 is connected to the first engine m1 in the first test bench 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.

[0060] The lower part of the low-pressure liquid methane storage tank G2 is connected to the second engine m2 in the second test bench 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.

[0061] Further, 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 fourth recovery pipeline h3 for recovering liquid oxygen in the pipeline.

[0062] 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 third recovery pipeline h3 upstream, and the liquid oxygen in the pipeline is recovered.

[0063] 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 upstream, and the liquid methane in the pipeline is recovered.

[0064] 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 upstream, and the liquid methane in the pipeline is recovered.

[0065] The liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are both provided with an exhaust valve for tank pressure relief.

[0066] In the specific embodiment of the application, the high-pressure liquid pipeline module H includes a high-pressure liquid oxygen storage tank H1 and a high-pressure liquid methane storage tank H2. 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 outlet pipeline w2 and the high-pressure liquid oxygen filling pipeline p2 for subsequent test oxygen.

[0067] 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 outlet pipeline v2 and the high-pressure liquid methane filling pipeline r1 for subsequent test methane.

[0068] The upper part of the high-pressure liquid oxygen storage tank H1 is connected to the gas distribution module D through the third pressure boosting module E3 for gas distribution and pressure boosting, and is depressurized through the third discharge module F3. In this embodiment, the third pressure boosting module E3 includes a solenoid valve, a flow limiting orifice plate, and a filter. In addition, the pressure boosting module is provided with two pressure boosting paths to improve the pressure boosting efficiency and safety. The solenoid valve and the flow limiting orifice plate are arranged on both pressure boosting branches along the gas flow direction, and the filter is arranged on the downstream merging main path.

[0069] In this embodiment, the third discharge module F3 is used for discharging and depressurizing the high-pressure liquid oxygen tank H1, and includes a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, and a silencer.

[0070] The lower part of the high-pressure liquid oxygen storage tank H1 is connected to the third engine m3 in the third test site M3 through the high-pressure liquid oxygen main pipeline h1 for delivering liquid oxygen to the third engine m3.

[0071] The upper part of the high-pressure liquid methane 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 an electromagnetic valve, a flow limiting orifice plate, and a filter. In addition, the pressurization module is provided with two pressurization paths to improve the pressurization efficiency and safety. Electromagnetic valves and flow limiting orifice plates are arranged on both pressurization branches along the gas flow direction, and a filter is arranged on the downstream merging main line.

[0072] In this embodiment, the fourth discharge module F4 is used for discharging and depressurizing the high-pressure liquid methane tank H2, which includes a safety valve, a pneumatic stop valve, a manual stop valve, a check valve, a silencer, and a flame arrester.

[0073] The lower part of the high-pressure liquid methane tank H2 is connected to the third engine m3 in the third test bench M3 through the high-pressure liquid methane main pipeline h2 for delivering liquid methane to the third engine m3.

[0074] Further, 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 sixth recovery pipeline h3 upstream for recovering liquid oxygen in the pipeline.

[0075] 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 upstream for recovering liquid methane in the pipeline.

[0076] The liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are both provided with exhaust valves for tank pressure relief.

[0077] 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, and the recovered liquid oxygen is delivered to the liquid oxygen storage tank P1 by pressurizing the liquid oxygen recovery tank L1.

[0078] The bottom of the liquid methane recovery tank T1 is connected to the liquid methane storage module R through the eighth recovery pipeline i2, and the recovered liquid methane is delivered to the liquid methane storage tank R1 by pressurizing the liquid methane recovery tank T1.

[0079] In the specific embodiment of the present application, 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. Among them,

[0080] 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, and is pumped into the liquid nitrogen vaporizer C3 through the liquid nitrogen plunger pump C2 for gasification, and the gasified nitrogen gas is stored in the high-pressure nitrogen cylinder group C4. In this embodiment, a plurality of high-pressure nitrogen cylinder groups C4 are provided to provide sufficient high-pressure nitrogen.

[0081] The high-pressure nitrogen cylinder group C4 is delivered to the nitrogen gas distribution module D through the nitrogen delivery main pipeline c1.

[0082] Further, the nitrogen gas distribution module D comprises 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 delivery main pipeline c1. Wherein,

[0083] The first gas distribution plate D1 is connected with the first booster module E1 through the first booster gas supply pipeline d1 to supply gas, thereby boosting the low-pressure liquid oxygen storage tank G1.

[0084] The second gas distribution plate D2 is connected with the second booster module E2 through the second booster gas supply pipeline d2 to supply gas, thereby boosting the low-pressure liquid methane storage tank G2.

[0085] The third gas distribution plate D3 is connected with the third booster module E3 through the third booster gas supply pipeline d3 to supply gas, thereby boosting the high-pressure liquid oxygen storage tank H1.

[0086] The fourth gas distribution plate D4 is connected with the fourth booster module E4 through the fourth booster gas supply pipeline d4 to supply gas, thereby boosting the high-pressure liquid methane storage tank H2.

[0087] In the embodiment of the present application, the liquid nitrogen in the first liquid nitrogen storage module A provides subcooling agent for the liquid oxygen subcooler W1 through the first liquid nitrogen filling pipeline a1, the liquid oxygen storage tank P1 in the liquid oxygen storage module P delivers liquid oxygen to the liquid oxygen subcooler W1 through the liquid oxygen subcooler inlet pipeline w1 to subcool the liquid oxygen, and the subcooled liquid oxygen is output through the liquid oxygen subcooler outlet pipeline w2.

[0088] The liquid nitrogen in the second liquid nitrogen storage module B provides subcooling agent for the liquid methane subcooler V1 through the third liquid nitrogen filling pipeline b1, the liquid methane storage tank R1 in the liquid methane storage module R delivers liquid methane to the liquid methane subcooler V1 through the liquid methane subcooler inlet pipeline v1 to subcool the liquid methane, and the subcooled liquid methane is output through the liquid methane subcooler outlet pipeline v2.

[0089] The operation flow of the liquid oxygen and methane carrier rocket engine test stand is as follows:

[0090] 1. Gas is prepared by the gas preparation module.

[0091] The first liquid nitrogen storage module A is started, the first liquid nitrogen storage tank A1 is pressurized by the self-contained booster, then the liquid nitrogen is filled into the liquid nitrogen storage tank C1 of the gas preparation module C through the second liquid nitrogen filling pipeline a2, and then the nitrogen gas is stored in the high-pressure nitrogen cylinder group C4 after being prepared by the liquid nitrogen plunger pump C2 and the liquid nitrogen vaporizer C3.

[0092] 2. When the liquid oxygen and methane low-pressure test is performed:

[0093] (1) The low-pressure liquid oxygen tank G1 is filled without subcooling or with subcooling.

[0094] When filled without subcooling, the liquid oxygen tank P1 is started by a booster, and the liquid oxygen is delivered to the low-pressure liquid oxygen tank G1 through the low-pressure liquid oxygen filling pipeline p1.

[0095] When filled with subcooling, the liquid oxygen tank P1 is started by a booster, and the liquid oxygen is delivered to the liquid oxygen subcooling module W through the liquid oxygen subcooler inlet pipeline w1. At the same time, the first liquid nitrogen tank module A delivers liquid nitrogen to the liquid oxygen subcooler W1 through the first liquid nitrogen filling pipeline a1, and the liquid nitrogen is used as a subcooling carrier to subcool the liquid oxygen at room temperature 91-95K to 80-84K required by the test. The subcooled liquid oxygen is delivered to the low-pressure liquid oxygen tank G1 through the liquid oxygen subcooler outlet pipeline w2 and the low-pressure liquid oxygen filling pipeline p1.

[0096] (2) The low-pressure liquid methane tank G2 is filled without subcooling or with subcooling.

[0097] When filled without subcooling, the liquid methane tank R1 is started by a booster, and the liquid methane is delivered to the low-pressure liquid methane tank G2 through the low-pressure liquid methane filling pipeline r2.

[0098] When filled with subcooling, the liquid methane tank R1 is started by a booster, and the liquid methane is delivered to the liquid methane subcooling module V through the liquid methane subcooler inlet pipeline v1. At the same time, the second liquid nitrogen tank module B delivers liquid nitrogen to the liquid methane subcooler V1 through the third liquid nitrogen filling pipeline b1, and the liquid nitrogen is used as a subcooling carrier to subcool the liquid methane at room temperature 110-115K to 100-105K required by the test. The subcooled liquid methane is delivered to the low-pressure liquid methane tank G2 through the liquid methane subcooler outlet pipeline v2 and the low-pressure liquid methane filling pipeline r2.

[0099] (3) The nitrogen gas distribution module D is distributed.

[0100] The nitrogen source gas is provided by the high-pressure nitrogen cylinder group C4, and is delivered to the first distribution board D1 and the second distribution board D2 through the nitrogen delivery main pipeline c1. The first distribution board D1 is connected to the first booster module E1 to pressurize the low-pressure liquid oxygen tank G1, and the second distribution board D2 is connected to the second booster module E2 to pressurize the low-pressure liquid methane tank G2. According to the demand for test gas, the pressure of the gas used is adjusted to a reasonable distribution requirement by adjusting the pressure reducing valves on the first distribution board D1 and the second distribution board D2.

[0101] (4) Conduct ignition tests on the 100-ton first engine m1 or the 120-ton second engine m2 of the low-pressure system.

[0102] 1) When conducting the ignition test of the 100-ton first engine m1 on the first test station M1 of the low-pressure system:

[0103] Open the bottom valve of the low-pressure liquid oxygen storage tank G1. Liquid oxygen propellant is delivered from the main low-pressure liquid oxygen pipeline g1 to the first low-pressure liquid oxygen branch pipeline g2. Open the first shut-off valve f1 and simultaneously close the second shut-off valve f2. Liquid oxygen is then delivered from the first low-pressure liquid oxygen branch pipeline g2 to the oxygen pump inlet of the first engine m1. The vaporized gas generated during the initial pre-cooling of the main low-pressure liquid oxygen pipeline g1 and the first low-pressure liquid oxygen branch pipeline g2 is discharged into the atmosphere at high altitude through the first discharge module F1 at the top of the low-pressure liquid oxygen storage tank G1. Simultaneously, open the discharge valve of the first recovery pipeline g4 at the highest point of the first low-pressure liquid oxygen branch pipeline g2 to pre-cool and exhaust the pipeline to ensure proper pre-cooling. The first recovery pipeline g4 discharges into the liquid oxygen recovery tank L1 via the fifth recovery pipeline h3.

[0104] Open the bottom valve of the low-pressure liquid methane storage tank G2. Liquid methane propellant is delivered from the main low-pressure liquid methane pipeline g6 to the first low-pressure liquid methane branch pipeline g7. Open the third shut-off valve f3 and simultaneously close the fourth shut-off valve f4. Liquid methane is delivered from the first low-pressure liquid methane branch pipeline g7 to the methane pump inlet of the first engine m1. The vaporized gas generated during the initial pre-cooling of the main low-pressure liquid methane pipeline g6 and the first low-pressure liquid methane branch pipeline g7 is discharged into the atmosphere at high altitude through the second emission module F2 at the top of the low-pressure liquid methane storage tank G2. Simultaneously, 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 pre-cool and exhaust the pipeline to ensure proper pre-cooling. The third recovery pipeline g9 discharges into the liquid methane recovery tank T1.

[0105] After the low-pressure liquid circuit module G's pipeline is pre-cooled, the exhaust valves in the first exhaust module F1 and the second exhaust module F2, as well as the exhaust valves in the first recovery pipeline g4 and the third recovery pipeline g9, are closed. Nitrogen gas is supplied through the first gas distribution plate D1 and delivered to the first pressurization module E1 via the first pressurization gas delivery pipeline d1. The low-pressure liquid oxygen storage tank G1 is pressurized with nitrogen through the solenoid valve, flow restrictor plate, and filter in the pressurization module. Nitrogen gas is also supplied through the second gas distribution plate D2 and delivered to the second pressurization module E2 via the second pressurization gas delivery pipeline d2. The low-pressure liquid methane storage tank G2 is pressurized with nitrogen through the solenoid valve, flow restrictor plate, and filter in the pressurization module. The pressurization pressure of both the first pressurization module E1 and the second pressurization module E2 is 5 MPa.

[0106] When the low-pressure liquid oxygen tank G1 and the low-pressure liquid methane tank G2 are pressurized and stabilized, ignition test of the first engine m1 of the low-pressure system 100 tons is carried out, and the test gas is introduced into the guide groove Y.

[0107] When the ignition test of the first engine m1 is completed, the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are pressurized with nitrogen respectively. After pressurization, the liquid oxygen in the liquid oxygen recovery tank L1 is recovered into the liquid oxygen storage tank P1 by pressurized extrusion through 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 by pressurized extrusion through the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2 and the high-pressure liquid methane filling pipeline r1.

[0108] 2) When the ignition test of the second engine m2 of 120 tons in the second test station M2 of the low-pressure system is carried out:

[0109] The bottom valve of the low-pressure liquid oxygen tank G1 is opened, and the liquid oxygen propellant is delivered to the second low-pressure liquid oxygen branch pipeline g3 through the low-pressure liquid oxygen main pipeline g1. The second cut-off valve f2 is opened, and the first cut-off valve f1 is closed at the same time. The liquid oxygen is delivered to the oxygen pump inlet of the second engine m2 through the second low-pressure liquid oxygen branch pipeline g3. The gasification 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 a high altitude through the first discharge module F1 at the top of the low-pressure liquid oxygen tank G1. At the same time, the discharge valve of the second recovery pipeline g5 at the high point of the second low-pressure liquid oxygen branch pipeline g3 is opened, and the pre-cooling exhaust of the pipeline is carried out to ensure that the pipeline is pre-cooled in place. The second recovery pipeline g5 is discharged into the liquid oxygen recovery tank L1 through the third recovery pipeline h3.

[0110] The bottom valve of the low-pressure liquid methane tank G2 is opened, and the liquid methane propellant is delivered to the second low-pressure liquid methane branch pipeline g8 through the low-pressure liquid methane main pipeline g6. The fourth cut-off valve f4 is opened, and the third cut-off valve f3 is closed at the same time. The liquid methane is delivered to the methane pump inlet of the second engine m2 through the second low-pressure liquid methane branch pipeline g8. The gasification 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 a high altitude through the second discharge module F2 at the top of the low-pressure liquid methane tank G2. At the same time, the discharge valve of the fourth recovery pipeline g10 at the high point of the second low-pressure liquid methane branch pipeline g8 is opened, and the pre-cooling exhaust of the pipeline is carried out to ensure that the pipeline is pre-cooled in place. The fourth recovery pipeline g10 is discharged into the liquid methane recovery tank T1 through the third recovery pipeline g9.

[0111] When the pipeline of the low-pressure liquid path module G is pre-cooled, the exhaust valves in the first and second exhaust modules F1 and F2 and the exhaust valves of the second and fourth recovery pipelines g5 and g10 are closed. Nitrogen gas is provided by the first gas distribution plate D1 and delivered to the first pressurization module E1 by the first pressurization gas delivery pipeline d1, and the low-pressure liquid oxygen tank G1 is pressurized with nitrogen by the electromagnetic valve, the flow limiting orifice plate and the filter in the pressurization module. Nitrogen gas is provided by the second gas distribution plate D2 and delivered to the second pressurization module E2 by the second pressurization gas delivery pipeline d2, and the low-pressure liquid methane tank G2 is pressurized with nitrogen by the electromagnetic valve, the flow limiting orifice plate and the filter in the pressurization module. The pressurization pressure of the first and second pressurization modules E1 and E2 is 5 MPa.

[0112] When the low-pressure liquid oxygen tank G1 and the low-pressure liquid methane tank G2 are pressurized and stabilized, the ignition test of the 120-ton second engine m2 of the low-pressure system is carried out, and the test gas is introduced into the guide groove Y.

[0113] When the ignition test of the second engine m2 is completed, the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are pressurized with nitrogen. After pressurization, the liquid oxygen in the liquid oxygen recovery tank L1 is recovered into the liquid oxygen storage tank P1 by pressurized extrusion through 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 by pressurized extrusion through the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2 and the high-pressure liquid methane filling pipeline r1.

[0114] 3. When the liquid oxygen and methane high-pressure test is carried out:

[0115] (1) The over-cooling filling or over-cooling filling of the high-pressure liquid oxygen tank H1 is carried out.

[0116] When over-cooling filling is carried out: start the liquid oxygen storage module P, and after the liquid oxygen storage tank P1 is pressurized by the self-contained pressurizer, the liquid oxygen is delivered to the high-pressure liquid oxygen tank H1 through the high-pressure liquid oxygen filling pipeline p2 for filling.

[0117] When over-cooling filling is carried out: start the liquid oxygen storage module P, and after the liquid oxygen storage tank P1 is pressurized by the self-contained pressurizer, the liquid oxygen is delivered to the liquid oxygen over-cooling module W through the liquid oxygen over-cooling device w1. At the same time, liquid nitrogen is delivered to the liquid oxygen over-cooling device W1 through the first liquid nitrogen filling pipeline a1 by the first liquid nitrogen storage module A, and the liquid nitrogen is used as a cooling carrier to cool the liquid oxygen at room temperature 91-95 K to the test required temperature of 80-84 K. The over-cooled liquid oxygen is delivered to the high-pressure liquid oxygen tank H1 through the liquid oxygen over-cooling device w2 and the high-pressure liquid oxygen filling pipeline p2.

[0118] (2) The over-cooling filling or over-cooling filling of the high-pressure liquid methane tank H2 is carried out.

[0119] But cold filling time: start liquid methane library module R, liquid methane library tank R1 through the self-contained booster to the tank after the boost, liquid methane through high pressure liquid methane filling pipeline r1 to high pressure liquid methane tank H2 filling.

[0120] When the supercooling filling: start liquid methane library module R, liquid methane library tank R1 through the self-contained booster to the tank after the boost, liquid methane through liquid methane supercooler inlet pipeline v1 to liquid methane supercooler V1 of liquid methane supercooling module V. At the same time, by the second liquid nitrogen library module B through the third liquid nitrogen filling pipeline b1 to liquid methane supercooler V1 liquid nitrogen is transported, using liquid nitrogen as the supercooling carrier, the liquid methane at room temperature 110~115K supercooled to 100~105K test requirements. After the supercooling of liquid methane through liquid methane supercooler outlet pipeline v2 and high pressure liquid methane filling pipeline r1 to high pressure liquid methane tank H2.

[0121] (3) nitrogen gas distribution system D is carried out.

[0122] The nitrogen source gas is provided by the high pressure nitrogen cylinder group C4, which is transported to the third gas distribution plate D3 and the fourth gas distribution plate D4 through the nitrogen gas delivery main pipeline c1. The third booster module E3 is connected through the third gas distribution plate D3 to boost the high pressure liquid oxygen tank H1, and the fourth booster module E4 is connected through the fourth gas distribution plate D4 to boost the high pressure liquid methane tank H2. According to the demand of test gas, by adjusting the pressure reducing valve on the third gas distribution plate D3 and the fourth gas distribution plate D4, the gas pressure is adjusted to the reasonable demand of gas distribution.

[0123] (4) when the high pressure system 30 tons level test site engine assembly m3 ignition test:

[0124] The bottom valve of the high pressure liquid oxygen tank H1 is opened, and the liquid oxygen propellant is transported to the oxygen pump inlet of the third engine m3 by the high pressure liquid oxygen main pipeline h1. The gasification gas generated by the high pressure liquid oxygen main pipeline h1 at the beginning of precooling is discharged to the atmosphere by the third discharge module F3 at the top of the high pressure liquid oxygen tank H1. At the same time, the discharge valve of the third recovery pipeline h3 at the high point of the high pressure liquid oxygen main pipeline h1 is opened, and the pipeline is pre-cooled to ensure that the pipeline is pre-cooled in place, and the third recovery pipeline h3 is discharged to the liquid oxygen recovery tank L1.

[0125] The tank bottom valve of the high-pressure liquid methane storage tank H2 is opened, and the liquid methane propellant is delivered from the high-pressure liquid methane main pipeline h2 to the methane pump inlet of the third engine m3. The gasification gas generated when the high-pressure liquid methane main pipeline h2 is initially pre-cooled is discharged to the atmosphere at a high altitude by the fourth discharge module F4 at the top of the high-pressure liquid methane storage tank H2. At the same time, the discharge valve of the sixth recovery pipeline h4 at the high point of the high-pressure liquid methane main pipeline h2 is opened, and the pipeline is pre-cooled and discharged to ensure that the pipeline is pre-cooled in place. The sixth recovery pipeline h4 is discharged to the liquid methane recovery tank T1 through the third recovery pipeline g9.

[0126] When the pipeline of the high-pressure liquid pipeline module H is pre-cooled in place, the exhaust valves in the third discharge module F3 and the fourth discharge module F4, and the discharge valves of the fifth recovery pipeline h3 and the sixth recovery pipeline h4 are closed. Nitrogen gas is provided by the third gas distribution plate D3 and delivered to the third pressurization module E3 by the third pressurization gas supply pipeline d3, and the high-pressure liquid oxygen storage tank H1 is pressurized by nitrogen gas through the electromagnetic valve, flow limiting orifice plate and filter in the pressurization system. Nitrogen gas is provided by the fourth gas distribution plate D4 and delivered to the fourth pressurization module E4 by the fourth pressurization gas supply pipeline d4, and the high-pressure liquid methane storage tank H2 is pressurized by nitrogen gas through the electromagnetic valve, flow limiting orifice plate and filter in the pressurization system. The pressurization pressure of the third pressurization module E3 and the fourth pressurization module E4 is 23 MPa.

[0127] When the high-pressure liquid oxygen storage tank H1 and the high-pressure liquid methane storage tank H2 are pressurized and stabilized, the ignition test of the 30-ton third engine m3 of the high-pressure system is carried out, and the test gas is introduced into the guide groove Y.

[0128] When the ignition test of the third engine m3 is completed, the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are pressurized with nitrogen gas. After pressurization, the liquid oxygen in the liquid oxygen recovery tank L1 is recovered to the liquid oxygen storage tank P1 by pressurized extrusion through 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 to the liquid methane storage tank R1 by pressurized extrusion through the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2 and the high-pressure liquid methane filling pipeline r1.

[0129] The above is only a specific embodiment of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. A test stand for a liquid oxygen-methane engine, comprising a multifunctional test system, characterized in that, The test stand includes a pneumatic system, a hydraulic system, and test stations. The gas system and the liquid system are connected by pipelines to supply gas. The liquid system is connected to the test station and is used to provide the test station with the liquid fuel required for testing. The gas path system includes: a first liquid nitrogen storage module (A), a second liquid nitrogen storage module (B), a gas generating module (C), and a gas distribution module (D), wherein the first liquid nitrogen storage module (A) is connected to the gas generating module (C) for gas generation, and the gas generating module (C) is connected to the gas distribution module (D) for gas distribution to the liquid path system; The liquid circuit system includes: a low-pressure liquid circuit module (G) and a high-pressure liquid circuit 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), wherein, The first liquid nitrogen storage module (A) is connected to the liquid oxygen subcooling module (W) through a pipeline to provide subcoolant. The liquid oxygen storage module (P) is connected to the liquid oxygen subcooling module (W) through a pipeline to subcool liquid oxygen. 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 a pipeline to provide subcooled liquid oxygen. 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. 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 a pipeline to provide subcooled liquid methane. The low-pressure hydraulic circuit module (G) and the high-pressure hydraulic circuit module (H) are respectively connected to the test station.

2. The liquid oxygen-methane engine test stand comprising a multifunctional test system as described in claim 1, characterized in that, The liquid circuit system further includes: a liquid oxygen recovery module (L) and a liquid methane recovery module (T), wherein, 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, and is used to recover liquid oxygen in the pipeline; 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, and is used to recover liquid methane in the pipeline.

3. The liquid oxygen-methane engine test stand composed of a multifunctional 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), wherein, 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 (G1) through the liquid oxygen subcooler outlet pipeline (w2) and the low-pressure liquid oxygen filling pipeline (p1). The 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 (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 and 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 station (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 is depressurized through the second discharge module (F2); The lower part of the low-pressure liquid methane storage tank (G2) is connected to the first test station (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 station (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 multifunctional test system according to claim 3, characterized in that, The first low-pressure liquid oxygen branch pipeline (g2) is connected upstream to the liquid oxygen recovery module (L) via the first recovery pipeline (g4) and the fifth recovery pipeline (h3); The second low-pressure liquid oxygen branch pipeline (g3) is connected upstream to the liquid oxygen recovery module (L) via the second recovery pipeline (g5) and the fifth recovery pipeline (h3); The first low-pressure liquid methane branch pipeline (g7) is connected upstream to the liquid methane recovery module (T) via a third recovery pipeline (g9); The second low-pressure liquid methane branch pipeline (g8) is connected upstream to the liquid methane recovery module (T) via the fourth recovery pipeline (g10) and the third recovery pipeline (g9).

5. The liquid oxygen-methane engine test stand comprising a multifunctional test system according to claim 3, characterized in that, The high-pressure hydraulic circuit module (H) includes: a high-pressure liquid oxygen storage tank (H1) and a high-pressure liquid methane storage tank (H2), wherein... 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 (H1) through the liquid oxygen subcooler outlet pipeline (w2) and the high-pressure liquid oxygen filling pipeline (p2). The 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 (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 is depressurized through the third discharge module (F3); The lower part of the high-pressure liquid oxygen storage tank (H1) is connected to the third test station (M3) via 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 is depressurized through the fourth discharge module (F4); The lower part of the high-pressure liquid methane storage tank (H2) is connected to the third test station (M3) via the high-pressure liquid methane main pipeline (h2).

6. The liquid oxygen-methane engine test stand comprising a multifunctional 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) via 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) via the sixth recovery pipeline (h4) and the third recovery pipeline (g9).

7. The liquid oxygen-methane engine test stand comprising a multifunctional 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) via an eighth recovery pipeline (i2).

8. The liquid oxygen-methane engine test stand comprising a multifunctional 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 cylinder group (C4), wherein... The liquid nitrogen in the first liquid nitrogen storage module (A) is added to the liquid nitrogen storage tank (C1) through the second liquid nitrogen filling pipeline (a2), and then pumped into the liquid nitrogen vaporizer (C3) by the liquid nitrogen plunger pump (C2) for vaporization, and the vaporized nitrogen is stored in the high-pressure nitrogen cylinder group (C4). The high-pressure nitrogen cylinder group (C4) is transported to the nitrogen distribution module (D) through the nitrogen delivery main pipeline (C1).

9. The liquid oxygen-methane engine test stand comprising a multifunctional test system according to claim 8, characterized in that, 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 delivery main pipeline (c1), wherein, The first gas distribution plate (D1) is connected to the first boosting module (E1) through the first boosting gas supply line (d1) for boosting gas supply; The second air distribution plate (D2) is connected to the second pressurization module (E2) through the second pressurization air supply line (d2) for pressurization air supply; The third gas distribution plate (D3) is connected to the third booster module (E3) through the third booster gas supply line (d3) for booster gas supply; The fourth gas distribution plate (D4) is connected to the fourth booster module (E4) through the fourth booster gas supply line (d4) for booster gas supply.

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

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