Liquid oxygen methane engine test bed

Abstract

The utility model provides a test bed for a liquid oxygen methane engine. 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 gas path system comprises a first liquid nitrogen warehouse module, a second liquid nitrogen warehouse module, a gas making module and a gas distribution module. The first liquid nitrogen warehouse module comprises a first liquid nitrogen warehouse storage tank used for storing liquid nitrogen. The second liquid nitrogen warehouse module comprises a second liquid nitrogen warehouse storage tank used for storing liquid nitrogen. The gas making module comprises a liquid nitrogen storage box, a liquid nitrogen plunger pump, a liquid nitrogen vaporizer and a high-pressure nitrogen cylinder set. Wherein the liquid nitrogen in the first liquid nitrogen storage tank is filled into the liquid nitrogen storage tank through the second liquid nitrogen filling pipeline and is pumped into the liquid nitrogen vaporizer through the liquid nitrogen plunger pump to be gasified, and the gasified nitrogen is stored in the high-pressure nitrogen cylinder group. And the high-pressure nitrogen cylinder group is conveyed into the nitrogen distribution module through a nitrogen conveying main pipeline. 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 utility model relates to rocket engine test stand technical field, concretely is a kind of liquid oxygen methane engine test stand. BACKGROUND

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

[0003] Test stand is a key facility in the development process of rocket engine. According to the saying in the industry, rocket engine is designed and tested. The design and process feasibility of engine are verified through test, and the development goal is achieved through multiple rounds of improvement and optimization. Generally, the development of 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 product design scheme demonstration and task requirements, and all technical and management risks and their influence and consequences are controlled within the specified acceptable range.

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

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

[0006] The utility model aims at overcoming the defects of prior art, and provides a liquid oxygen methane engine test stand to solve the problem that the engine test stand in prior art cannot meet the test needs of various types, different sizes and different application scenarios and has high construction cost.

[0007] This utility model provides a liquid oxygen-methane engine test stand, which includes a gas system, a liquid system, and a test station. The gas system and the liquid system are connected by pipelines to supply gas, and the liquid system is connected to the test station to provide the liquid fuel required for testing. The gas system includes a first liquid nitrogen storage module, a second liquid nitrogen storage module, a gas generation module, and a gas distribution module. The first liquid nitrogen storage module is connected by pipelines to the gas generation module for gas generation, and the gas generation module is connected by pipelines to the gas distribution module for gas distribution to the liquid system. The first liquid nitrogen storage module includes a first liquid nitrogen storage tank for storing liquid nitrogen; the second liquid nitrogen storage module includes a second liquid nitrogen storage tank for storing liquid nitrogen; the gas generation module includes: a liquid nitrogen 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 tank is added to the liquid nitrogen tank through a second liquid nitrogen filling pipeline, and is pumped into the liquid nitrogen vaporizer by the liquid nitrogen plunger pump for vaporization, and the vaporized nitrogen is stored in the high-pressure nitrogen cylinder group; the high-pressure nitrogen cylinder group is transported to the nitrogen gas distribution module through a nitrogen delivery pipeline.

[0008] Further, the liquid circuit system includes: a low-pressure liquid circuit module and 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. The first liquid nitrogen storage tank is connected to the liquid oxygen subcooling module via pipelines to provide subcoolant. The liquid oxygen storage module is connected to the liquid oxygen subcooling module via pipelines to subcool liquid oxygen. The liquid oxygen subcooling module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module via pipelines to provide subcooled liquid oxygen. The second liquid nitrogen storage tank is connected to the liquid methane subcooling module via pipelines to provide subcoolant. The liquid methane storage module is connected to the liquid methane subcooling module via pipelines to subcool liquid methane. The liquid methane subcooling module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module via pipelines 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.

[0009] In an embodiment of this utility model, the liquid circuit system further includes a liquid oxygen recovery module and a liquid methane recovery module, wherein the liquid oxygen recovery module is connected to the low-pressure liquid circuit module and the high-pressure liquid circuit module through a pipeline, and is used to recover 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, and is used to recover liquid methane in the pipeline.

[0010] Further, the low-pressure liquid circuit module includes: a low-pressure liquid oxygen storage tank and a low-pressure liquid methane storage tank, wherein the liquid oxygen subcooled 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 subcooled in 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 a first pressurization module for gas distribution and pressurization, and is depressurized through a first discharge module; the lower part of the low-pressure liquid oxygen storage tank... The low-pressure liquid oxygen main pipeline and the first low-pressure liquid oxygen branch pipeline connect to the first test station; the lower part of the low-pressure liquid oxygen storage tank connects to the second test station via 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 connects to the gas distribution module via the second pressurization module for gas distribution and pressurization, and depressurizes via the second discharge module; the lower part of the low-pressure liquid methane storage tank connects to the first test station via 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 connects to the second test station via the low-pressure liquid methane main pipeline and the second low-pressure liquid methane branch pipeline.

[0011] Furthermore, the upstream of the first low-pressure liquid oxygen branch pipeline is connected to the liquid oxygen recovery module via a first recovery pipeline and a fifth recovery pipeline; the upstream of the second low-pressure liquid oxygen branch pipeline is connected to the liquid oxygen recovery module via a 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 via a third recovery pipeline; and the upstream of the second low-pressure liquid methane branch pipeline is connected to the liquid methane recovery module via a fourth recovery pipeline and the third recovery pipeline.

[0012] Further, the high-pressure liquid circuit module includes: a high-pressure liquid oxygen storage tank and a high-pressure liquid methane storage tank. Liquid oxygen subcooled in the liquid oxygen subcooler of the liquid oxygen subcooling module is transported to the high-pressure liquid oxygen storage tank via the liquid oxygen subcooler outlet pipeline and the high-pressure liquid oxygen filling pipeline. Liquid methane subcooled in the liquid methane subcooling module is transported to the high-pressure liquid methane storage tank via 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 via a third pressurization module for gas distribution and pressurization, and depressurized via a third discharge module. The lower part of the high-pressure liquid oxygen storage tank is connected to a third test station via a high-pressure liquid oxygen main pipeline. The upper part of the high-pressure liquid methane storage tank is connected to the gas distribution module via a fourth pressurization module for gas distribution and pressurization, and depressurized via a fourth discharge module. The lower part of the high-pressure liquid methane storage tank is connected to the third test station via a high-pressure liquid methane main pipeline.

[0013] Furthermore, the upstream of the high-pressure liquid oxygen main pipeline is connected to the liquid oxygen recovery module via a fifth recovery pipeline; the upstream of the high-pressure liquid methane main pipeline is connected to the liquid methane recovery module via a sixth recovery pipeline and a third recovery pipeline.

[0014] Furthermore, the liquid oxygen recovery module includes a liquid oxygen recovery tank, the bottom of which is connected to the liquid oxygen storage module via 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 via an eighth recovery pipeline.

[0015] Furthermore, the nitrogen gas distribution module includes a first gas distribution plate, a second gas distribution plate, a third gas distribution plate, and a fourth gas distribution plate connected in parallel on the nitrogen delivery main pipeline. The first gas distribution plate is connected to the first pressurization module via a first pressurization gas supply pipeline for pressurization gas supply; the second gas distribution plate is connected to the second pressurization module via a second pressurization gas supply pipeline for pressurization gas supply; the third gas distribution plate is connected to the third pressurization module via a third pressurization gas supply pipeline for pressurization gas supply; and the fourth gas distribution plate is connected to the fourth pressurization module via a fourth pressurization gas supply pipeline for pressurization gas supply.

[0016] In this embodiment of the invention, liquid nitrogen in the first liquid nitrogen storage tank provides supercoolant to 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 for liquid oxygen subcooling through the liquid oxygen subcooler inlet pipeline; liquid nitrogen in the second liquid nitrogen storage tank provides supercoolant to 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 for liquid methane subcooling through the liquid methane subcooler inlet pipeline.

[0017] As can be seen from the above embodiments, the liquid oxygen methane engine test stand provided in this application has at least the following advantages:

[0018] The multi-functional test system for liquid oxygen-methane engines consists of one gas system, two liquid systems, and three test stations. The two liquid systems include a low-pressure liquid system module and a high-pressure liquid system module. Both liquid systems share a single gas system for gas supply, enabling the system to deliver the necessary media to the three test stations as needed. This allows the test station to meet the gas supply requirements of different engine models, while also improving resource sharing of the test equipment, significantly reducing the overall cost of equipment construction and maintenance, and increasing the efficiency of engine testing.

[0019] In addition, the multi-functional test system can adapt to the testing needs of engines of different sizes by adjusting some structures and parameters of the test bench. By simulating different application scenarios, it can conduct targeted tests on the engine, ensuring the reliability and adaptability of the engine and improving the overall utilization rate of the test bench.

[0020] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the present invention. Attached Figure Description

[0021] The accompanying drawings are part of the specification of this utility model and illustrate exemplary embodiments of the utility model. The drawings, together with the description in the specification, are used to illustrate the principles of this utility model.

[0022] Fig. 1 A system structure diagram of a liquid oxygen methane engine test stand provided by this utility model.

[0023] Fig. 2 A partially enlarged view of the low-pressure hydraulic circuit module of a liquid oxygen methane engine test stand provided by this utility model.

[0024] Fig. 3 A partially enlarged view of the high-pressure hydraulic circuit module of a liquid oxygen methane engine test stand provided by this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 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 - Flow guide channel;

[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 valve stem, D2 - Second valve stem, D3 - Third valve stem, D4 - Fourth valve stem;

[0030] E1 - First booster module, E2 - Second booster module, E3 - Third booster module, E4 - Fourth booster module;

[0031] F1 - First emission module, F2 - Second emission module, F3 - Third emission module, F4 - Fourth emission module;

[0032] 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;

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

[0034] M1 - First test station, M2 - Second test station, M3 - Third test 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-Main nitrogen delivery pipeline, d1-First pressurized gas delivery pipeline, d2-Second pressurized gas delivery pipeline, d3-Third pressurized gas delivery pipeline, d4-Fourth pressurized 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 line, h2 - High-pressure liquid methane main line, h3 - Fifth recovery line, h4 - Sixth recovery line, i1 - Seventh recovery line, i2 - Eighth recovery line;

[0039] m1 - First engine, m2 - Second engine, m3 - Third engine;

[0040] p1 - ​​Low-pressure liquid oxygen filling line, p2 - High-pressure liquid oxygen filling line, r1 - High-pressure liquid methane filling line, r2 - Low-pressure liquid methane filling line, v1 - Liquid methane subcooler inlet line, v2 - Liquid methane subcooler outlet line, w1 - Liquid oxygen subcooler inlet line, w2 - Liquid oxygen subcooler outlet line. Detailed Implementation

[0041] Various exemplary embodiments of the present invention are now described in detail. This detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, features and implementations of the present invention.

[0042] Various improvements and variations can be made to the specific embodiments described in this utility model without departing from the scope or spirit of this utility model, which will be obvious to those skilled in the art. Other embodiments derived from this utility model description will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0043] This utility model provides a test stand for a liquid oxygen-methane engine, such as... Figs. 1-3The diagram shows the system connection structure of the test stand. In a specific embodiment, the test stand includes a pneumatic system, a hydraulic system, and a test station. 。 The gas supply system and the liquid supply system are connected by pipelines to supply gas, while the liquid supply system is connected to the test stations to provide the liquid fuel required for testing. This embodiment includes one gas supply system, two liquid supply systems, and three test stations. The three test stations are divided into two low-pressure test stations for a 100-ton engine and a 120-ton engine, and one high-pressure test station for a 30-ton engine. Additionally, a guide channel Y is installed at the bottom of each test station. This guide channel Y is an inclined, water-storage type guide channel used to divert the exhaust gas generated during rocket engine testing at the three test stations, reducing noise pollution. The inclined, water-storage type guide channel is simpler in structure and lower in construction cost than a vertical guide channel.

[0044] Specifically, the gas supply system includes: a first liquid nitrogen storage module A, a second liquid nitrogen storage module B, a gas generation module C, and a gas distribution module D. The first liquid nitrogen storage module A is connected to the gas generation module C for gas generation, and the gas generation module C is connected to the gas distribution module D for distributing gas to the liquid supply system.

[0045] The first liquid nitrogen storage module A includes a first liquid nitrogen storage tank A1 for storing liquid nitrogen.

[0046] The second liquid nitrogen storage module B includes a second liquid nitrogen storage tank B1 for storing liquid nitrogen.

[0047] The gas generation module C includes: a liquid nitrogen storage tank C1, a liquid nitrogen plunger pump C2, a liquid nitrogen vaporizer C3, and a high-pressure nitrogen cylinder group C4. Liquid nitrogen from the first liquid nitrogen storage tank A1 is added to the liquid nitrogen storage tank C1 via a second liquid nitrogen filling pipeline a2, and then pumped into the liquid nitrogen vaporizer C3 by the liquid nitrogen plunger pump C2 for vaporization. The vaporized nitrogen is then stored in the high-pressure nitrogen cylinder group C4. In this embodiment, multiple high-pressure nitrogen cylinder groups C4 are provided to supply sufficient high-pressure nitrogen.

[0048] The high-pressure nitrogen cylinder group C4 is supplied to the nitrogen distribution module D via the nitrogen delivery main pipeline C1. In this embodiment, the high-pressure nitrogen cylinder group C4 includes at least one high-pressure nitrogen cylinder.

[0049] In a specific embodiment of this utility model, 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. Among them,

[0050] The first liquid nitrogen storage tank 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 the 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 pipelines to provide them with subcooled liquid oxygen.

[0051] The second liquid nitrogen storage tank 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 the 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 pipelines to provide them with subcooled liquid methane.

[0052] The low-pressure hydraulic circuit module G and the high-pressure hydraulic circuit module H are respectively connected to test stations. In this embodiment, the low-pressure hydraulic circuit module G is connected to two test stations, namely the low-pressure test stations of the 100-ton engine and the 120-ton engine.

[0053] The high-pressure hydraulic circuit module H is connected to a test station, which is a high-pressure test station for a 30-ton engine.

[0054] Furthermore, the liquid circuit system also includes 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 circuit module G and the high-pressure liquid circuit module H via pipelines, and is used to recover liquid oxygen from the pipelines.

[0055] 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.

[0056] In a specific embodiment of this utility model, 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. Liquid oxygen, after being 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 via the liquid oxygen subcooler outlet pipe w2 and the low-pressure liquid oxygen filling pipe p1 for subsequent experimental oxygen use.

[0057] Liquid methane, after being 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 for subsequent test methane use.

[0058] 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 restrictor plate, and a filter. In addition, this pressurization module is equipped with two pressurization paths to improve pressurization efficiency and safety. Solenoid valves and flow restrictors are installed along the gas flow direction on both pressurization branches, and a filter is installed on the downstream converging main path.

[0059] In this embodiment, the first discharge module F1 is used to vent and depressurize the low-pressure liquid oxygen tank G1, and includes: a safety valve, a pneumatic shut-off valve, a manual shut-off valve, a check valve, and a silencer.

[0060] The lower part of the low-pressure liquid oxygen storage tank G1 is connected to the first engine m1 in the first test station M1 through the low-pressure liquid oxygen main pipeline g1 and the first low-pressure liquid oxygen branch pipeline g2, and is used to supply liquid oxygen to the first engine m1.

[0061] The lower part of the low-pressure liquid oxygen storage tank G1 is connected to the second engine m2 in the second test station M2 through the low-pressure liquid oxygen main pipeline g1 and the second low-pressure liquid oxygen branch pipeline g3, and is used to supply liquid oxygen to the second engine m2.

[0062] The upper part of the low-pressure liquid methane storage tank G2 is connected to the gas distribution module D via the second pressurization module E2 for gas distribution and pressurization, and is depressurized via the second discharge module F2. In this embodiment, the second pressurization module E2 includes a solenoid valve, a flow restrictor plate, and a filter. Furthermore, this pressurization module is equipped with two pressurization paths to improve pressurization efficiency and safety. Solenoid valves and flow restrictors are installed along the gas flow direction on both pressurization branches, and a filter is installed on the downstream confluence channel.

[0063] In this embodiment, the second emission module F2 is used to vent and depressurize the low-pressure liquid methane tank G2, and includes: a safety valve, a pneumatic shut-off valve, a manual shut-off valve, a check valve, and a silencer.

[0064] 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, and is used to supply liquid methane to the first engine m1.

[0065] 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 via the low-pressure liquid methane main pipeline g6 and the second low-pressure liquid methane branch pipeline g8, for supplying liquid methane to the second engine m2.

[0066] Furthermore, 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.

[0067] 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, so as to recover the liquid oxygen in the pipeline.

[0068] 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 via the third recovery pipeline g9, so as to recover the liquid methane in the pipeline.

[0069] 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 via the fourth recovery pipeline g10 and the third recovery pipeline g9, so as to recover the liquid methane in the pipeline.

[0070] Both the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are equipped with vent valves for depressurizing the tanks.

[0071] In a specific embodiment of this utility model, the high-pressure liquid circuit module H includes: a high-pressure liquid oxygen storage tank H1 and a high-pressure liquid methane storage tank H2. The liquid oxygen, after being 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 via the liquid oxygen subcooler outlet pipe w2 and the high-pressure liquid oxygen filling pipe p2 for subsequent experimental oxygen use.

[0072] Liquid methane, after being 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 for subsequent test methane use.

[0073] The upper part of the high-pressure liquid oxygen storage tank H1 is connected to the gas distribution module D via the third pressurization module E3 for gas distribution and pressurization, and is depressurized via the third discharge module F3. In this embodiment, the third pressurization module E3 includes a solenoid valve, a flow restrictor plate, and a filter. Furthermore, this pressurization module is equipped with two pressurization paths to improve pressurization efficiency and safety. Solenoid valves and flow restrictors are installed along the gas flow direction on both pressurization branches, and a filter is installed on the downstream confluence channel.

[0074] In this embodiment, the third discharge module F3 is used to vent and depressurize the high-pressure liquid oxygen tank H1, and includes: a safety valve, a pneumatic shut-off valve, a manual shut-off valve, a check valve, and a silencer.

[0075] 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, which is used to supply liquid oxygen to the third engine m3.

[0076] The upper part of the high-pressure liquid methane storage tank H2 is connected to the gas distribution module D via the fourth pressurization module E4 for gas distribution and pressurization, and is depressurized via the fourth discharge module F4. In this embodiment, the fourth pressurization module E4 includes a solenoid valve, a flow restrictor plate, and a filter. Furthermore, this pressurization module is equipped with two pressurization paths to improve pressurization efficiency and safety. Solenoid valves and flow restrictors are installed along the gas flow direction on both pressurization branches, and a filter is installed on the downstream confluence channel.

[0077] In this embodiment, the fourth emission module F4 is used to vent and depressurize the high-pressure liquid methane tank H2, and includes: a safety valve, a pneumatic shut-off valve, a manual shut-off valve, a check valve, a silencer, and a flame arrester.

[0078] 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 via the high-pressure liquid methane main pipeline h2, and is used to supply liquid methane to the third engine m3.

[0079] Furthermore, upstream of the high-pressure liquid oxygen main pipeline h1, the fifth recovery pipeline h3 connects to the liquid oxygen recovery tank L1 in the liquid oxygen recovery module L to recover the liquid oxygen in the pipeline.

[0080] Upstream of the high-pressure liquid methane main pipeline h2, through the sixth recovery pipeline h4 and the third recovery pipeline g9, it is connected to the liquid methane recovery tank T1 in the liquid methane recovery module T to recover the liquid methane in the pipeline.

[0081] Both the liquid oxygen recovery tank L1 and the liquid methane recovery tank T1 are equipped with vent valves for depressurizing the tanks.

[0082] Furthermore, 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.

[0083] 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.

[0084] In a specific embodiment of this utility model, 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,

[0085] The first gas distribution plate D1 is connected to the first pressurization module E1 through the first pressurization gas supply pipeline d1 to pressurize and supply gas, thereby pressurizing the low-pressure liquid oxygen storage tank G1.

[0086] The second gas distribution plate D2 is connected to the second pressurization module E2 through the second pressurization gas supply pipeline d2 to pressurize and supply gas, thereby pressurizing the low-pressure liquid methane storage tank G2.

[0087] The third gas distribution plate D3 is connected to the third pressurization module E3 through the third pressurization gas supply pipeline d3 to pressurize and supply gas, thereby pressurizing the high-pressure liquid oxygen storage tank H1.

[0088] The fourth gas distribution plate D4 is connected to the fourth pressurization module E4 through the fourth pressurization gas supply pipeline d4 to pressurize and supply gas, thereby pressurizing the high-pressure liquid methane storage tank H2.

[0089] In a specific embodiment of this utility model, the liquid nitrogen in the first liquid nitrogen storage tank A provides supercoolant to 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 transports liquid oxygen to the liquid oxygen subcooler W1 through the liquid oxygen subcooler inlet pipeline w1 for liquid oxygen subcooling. The subcooled liquid oxygen is output through the liquid oxygen subcooler outlet pipeline w2.

[0090] The liquid nitrogen in the second liquid nitrogen storage tank B provides subcoolant to 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 transports liquid methane to the liquid methane subcooler V1 through the liquid methane subcooler inlet pipeline v1 for liquid methane subcooling. The subcooled liquid methane is then output through the liquid methane subcooler outlet pipeline v2.

[0091] The operating procedure of the liquid oxygen-methane launch vehicle engine test stand is as follows:

[0092] 1. Use a gas production module to produce gas.

[0093] Start the first liquid nitrogen storage module A. After the first liquid nitrogen storage tank A1 is pressurized by its own pressurizer, liquid nitrogen is added to the liquid nitrogen storage tank C1 of the gas generation module C through the second liquid nitrogen filling pipeline a2. Then, after passing through the liquid nitrogen plunger pump C2 and the liquid nitrogen vaporizer C3 in sequence, the nitrogen is stored in the high-pressure nitrogen cylinder group C4 for use in the test.

[0094] 2. When conducting a low-pressure test run of liquid oxygen and methane:

[0095] (1) Perform either non-cooling or super-cooling filling of the low-pressure liquid oxygen storage tank G1.

[0096] However, during cold filling: when the liquid oxygen storage module P is started, the liquid oxygen storage tank P1 is pressurized by its own booster, and then the liquid oxygen is transported to the low-pressure liquid oxygen storage tank G1 through the low-pressure liquid oxygen filling pipeline p1 for filling.

[0097] During subcooling refueling: The liquid oxygen storage module P is activated. Liquid oxygen storage tank P1 is pressurized via its built-in pressurizer. Liquid oxygen is then transported to the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W through the liquid oxygen subcooler inlet pipe w1. Simultaneously, liquid nitrogen from the first liquid nitrogen storage module A is transported to the liquid oxygen subcooler W1 through the first liquid nitrogen refueling pipe a1. Using liquid nitrogen as the subcooling medium, the liquid oxygen at room temperature (91–95 K) is subcooled to the required experimental temperature of 80–84 K. The subcooled liquid oxygen is then transported to the low-pressure liquid oxygen storage tank G1 through the liquid oxygen subcooler outlet pipe w2 and the low-pressure liquid oxygen refueling pipe p1.

[0098] (2) Perform either non-cooling or super-cooling filling of the low-pressure liquid methane storage tank G2.

[0099] However, during cold filling: when the liquid methane storage module R is started, the liquid methane storage tank R1 is pressurized by its own booster, and then the liquid methane is transported to the low-pressure liquid methane storage tank G2 through the low-pressure liquid methane filling pipeline r2 for filling.

[0100] During subcooling refueling: The liquid methane storage module R is activated. The liquid methane storage tank R1 is pressurized via its built-in booster. Liquid methane is then transported through the liquid methane subcooler inlet pipe v1 to the liquid methane subcooler V1 of the liquid methane subcooling module V. Simultaneously, liquid nitrogen is transported from the second liquid nitrogen storage module B to the liquid methane subcooler V1 through the third liquid nitrogen refueling pipe b1. Using liquid nitrogen as the subcooling medium, the liquid methane at room temperature (110–115 K) is subcooled to the required experimental temperature of 100–105 K. The subcooled liquid methane is then transported through the liquid methane subcooler outlet pipe v2 and the low-pressure liquid methane refueling pipe r2 to the low-pressure liquid methane storage tank G2.

[0101] (3) Perform nitrogen gas mixing in module D.

[0102] Nitrogen source gas is provided by high-pressure nitrogen cylinder group C4, and delivered to the first gas distribution plate D1 and the second gas distribution plate D2 via nitrogen main pipeline C1. The first gas distribution plate D1 connects to the first pressurization module E1 to pressurize the low-pressure liquid oxygen storage tank G1, and the second gas distribution plate D2 connects to the second pressurization module E2 to pressurize the low-pressure liquid methane storage tank G2. According to the gas requirements of the experiment, the pressure is adjusted to a reasonable gas distribution level by regulating the pressure reducing valves on the first and second gas distribution plates D1 and D2.

[0103] (4) Conduct ignition tests on the 100-ton first engine m1 or the 120-ton second engine m2 of the low-pressure system.

[0104] 1) When conducting the ignition test of the 100-ton first engine m1 at the first test station M1 of the low-pressure system:

[0105] 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.

[0106] 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.

[0107] 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.

[0108] After the low-pressure liquid oxygen storage tank G1 and the low-pressure liquid methane storage tank G2 are pressurized and stabilized, the ignition test of the first engine m1 of the 100-ton class of the low-pressure system is carried out, and the gas produced in the test is diverted to the guide channel Y.

[0109] When the ignition test of the first engine m1 is completed, nitrogen is pressurized into 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 compressed and recovered into the liquid oxygen storage tank P1 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 compressed and recovered into the liquid methane storage tank R1 through the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2, and the high-pressure liquid methane filling pipeline r1.

[0110] 2) When conducting the ignition test of the 120-ton second engine m2 on the second test station M2 of the low-pressure system:

[0111] 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 second low-pressure liquid oxygen branch pipeline g3. Open the second shut-off valve f2 and simultaneously close the first shut-off valve f1. Liquid oxygen is then delivered from the second low-pressure liquid oxygen branch pipeline g3 to the oxygen pump inlet of the second engine m2. The vaporized gas generated during the initial pre-cooling of the main low-pressure liquid oxygen pipeline g1 and the second low-pressure liquid oxygen branch pipeline g3 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 second recovery pipeline g5 at the highest point of the second low-pressure liquid oxygen branch pipeline g3 to pre-cool and exhaust the pipeline, ensuring proper pre-cooling. The second recovery pipeline g5 then discharges into the liquid oxygen recovery tank L1 via the fifth recovery pipeline h3.

[0112] 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 second low-pressure liquid methane branch pipeline g8. Open the fourth shut-off valve f4 and simultaneously close the third shut-off valve f3. Liquid methane is then delivered from the second low-pressure liquid methane branch pipeline g8 to the methane pump inlet of the second engine m2. The vaporized gas generated during the initial pre-cooling of the main low-pressure liquid methane pipeline g6 and the second low-pressure liquid methane branch pipeline g8 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 fourth recovery pipeline g10 at the highest point of the second low-pressure liquid methane branch pipeline g8 to pre-cool and exhaust the pipeline to ensure proper pre-cooling. The fourth recovery pipeline g10 is then discharged into the liquid methane recovery tank T1 via the third recovery pipeline g9.

[0113] After the low-pressure liquid circuit module G's pipeline is pre-cooled, the exhaust valves in the first and second exhaust modules F1 and F2, as well as the exhaust valves in the second and fourth recovery pipelines g5 and g10, 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. Similarly, nitrogen gas is 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 and second pressurization modules E1 and E2 is 5 MPa.

[0114] After the low-pressure liquid oxygen storage tank G1 and the low-pressure liquid methane storage tank G2 are pressurized and stabilized, the ignition test of the second engine m2 of the 120-ton class of the low-pressure system is carried out, and the gas produced in the test is diverted to the guide channel Y.

[0115] When the ignition test of the second engine m2 is completed, nitrogen is pressurized into 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 compressed and recovered into the liquid oxygen storage tank P1 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 compressed and recovered into the liquid methane storage tank R1 through the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2, and the high-pressure liquid methane filling pipeline r1.

[0116] 3. When conducting high-pressure test runs of liquid oxygen and methane:

[0117] (1) Perform either non-cooling or supercooling filling of the high-pressure liquid oxygen storage tank H1.

[0118] However, during cold filling: when the liquid oxygen storage module P is started, the liquid oxygen storage tank P1 is pressurized by its own booster, and then the liquid oxygen is transported to the high-pressure liquid oxygen storage tank H1 through the high-pressure liquid oxygen filling pipeline p2 for filling.

[0119] During subcooling refueling: The liquid oxygen storage module P is activated. Liquid oxygen storage tank P1 is pressurized via its built-in pressurizer. Liquid oxygen is then transported to the liquid oxygen subcooler W1 of the liquid oxygen subcooling module W through the liquid oxygen subcooler inlet pipe w1. Simultaneously, liquid nitrogen from the first liquid nitrogen storage module A is transported to the liquid oxygen subcooler W1 through the first liquid nitrogen refueling pipe a1. Using liquid nitrogen as the subcooling medium, the liquid oxygen at room temperature (91–95 K) is subcooled to the required experimental temperature of 80–84 K. The subcooled liquid oxygen is then transported to the high-pressure liquid oxygen storage tank H1 through the liquid oxygen subcooler outlet pipe w2 and the high-pressure liquid oxygen refueling pipe p2.

[0120] (2) Perform either non-cooling or supercooling filling of the high-pressure liquid methane storage tank H2.

[0121] However, during cold filling: when the liquid methane storage module R is started, the liquid methane storage tank R1 is pressurized by its own booster, and then the liquid methane is transported to the high-pressure liquid methane storage tank H2 through the high-pressure liquid methane filling pipeline r1 for filling.

[0122] During subcooling refueling: The liquid methane storage module R is activated. The liquid methane storage tank R1 is pressurized via its built-in booster. Liquid methane is then transported through the liquid methane subcooler inlet pipe v1 to the liquid methane subcooler V1 of the liquid methane subcooling module V. Simultaneously, liquid nitrogen is transported from the second liquid nitrogen storage module B to the liquid methane subcooler V1 through the third liquid nitrogen refueling pipe b1. Using liquid nitrogen as the subcooling medium, the liquid methane at room temperature (110–115 K) is subcooled to the required experimental temperature of 100–105 K. The subcooled liquid methane is then transported through the liquid methane subcooler outlet pipe v2 and the high-pressure liquid methane refueling pipe r1 to the high-pressure liquid methane storage tank H2.

[0123] (3) Perform gas mixing for nitrogen mixing system D.

[0124] Nitrogen source gas is provided by high-pressure nitrogen cylinder group C4, and delivered to the third gas distribution plate D3 and the fourth gas distribution plate D4 via nitrogen main pipeline C1. The third gas distribution plate D3 connects to the third pressurization module E3 to pressurize the high-pressure liquid oxygen storage tank H1, and the fourth gas distribution plate D4 connects to the fourth pressurization module E4 to pressurize the high-pressure liquid methane storage tank H2. According to the gas requirements of the experiment, the pressure is adjusted to a reasonable gas distribution level by regulating the pressure reducing valves on the third and fourth gas distribution plates D3 and D4.

[0125] (4) When conducting the ignition test of the engine assembly m3 at the 30-ton test station of the high-pressure system:

[0126] Open the bottom valve of the high-pressure liquid oxygen storage tank H1, and the liquid oxygen propellant is delivered from the high-pressure liquid oxygen main pipeline h1 to the oxygen pump inlet of the third engine m3. The vaporized gas generated during the initial pre-cooling of the high-pressure liquid oxygen main pipeline h1 is discharged into the atmosphere at high altitude through the third discharge module F3 at the top of the high-pressure liquid oxygen storage tank H1. Simultaneously, open the discharge valve of the fifth recovery pipeline h3 at the highest point of the high-pressure liquid oxygen main pipeline h1 to pre-cool and exhaust the pipeline, ensuring proper pre-cooling. The fifth recovery pipeline h3 discharges into the liquid oxygen recovery tank L1.

[0127] Open the bottom valve of the high-pressure liquid methane storage tank H2, 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 vaporized gas generated during the initial pre-cooling of the high-pressure liquid methane main pipeline h2 is discharged into the atmosphere at high altitude through the fourth emission module F4 at the top of the high-pressure liquid methane storage tank H2. Simultaneously, open the discharge valve of the sixth recovery pipeline h4 at the highest point of the high-pressure liquid methane main pipeline h2 to pre-cool and exhaust the pipeline, ensuring proper pre-cooling. The sixth recovery pipeline h4 then discharges into the liquid methane recovery tank T1 via the third recovery pipeline g9.

[0128] After the high-pressure liquid circuit module H's pipeline is pre-cooled, the exhaust valves in the third and fourth exhaust modules F3 and F4, as well as the exhaust valves in the fifth and sixth recovery pipelines h3 and h4, are closed. Nitrogen gas is supplied through the third gas distribution plate D3 and delivered to the third pressurization module E3 via the third pressurization gas supply pipeline d3. The high-pressure liquid oxygen storage tank H1 is pressurized with nitrogen through the solenoid valves, flow restrictor plates, and filters in the pressurization system. Similarly, nitrogen gas is supplied through the fourth gas distribution plate D4 and delivered to the fourth pressurization module E4 via the fourth pressurization gas supply pipeline d4. The high-pressure liquid methane storage tank H2 is pressurized with nitrogen through the solenoid valves, flow restrictor plates, and filters in the pressurization system. The pressurization pressure of both the third pressurization module E3 and the fourth pressurization module E4 is 23 MPa.

[0129] After 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 third engine m3 of the high-pressure system (30 tons) is carried out, and the gas produced in the test is diverted to the guide channel Y.

[0130] When the ignition test of the third engine m3 is completed, nitrogen is pressurized into 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 compressed and recovered into the liquid oxygen storage tank P1 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 compressed and recovered into the liquid methane storage tank R1 through the eighth recovery pipeline i2, the low-pressure liquid methane filling pipeline r2, and the high-pressure liquid methane filling pipeline r1.

[0131] The above description is merely an illustrative embodiment of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A test stand for a liquid oxygen-methane engine, characterized in that, The test stand includes a pneumatic system, a hydraulic system, and test stations. The gas system is connected to the liquid system via pipelines to supply gas, and the liquid system is connected to the test station to provide the test station with the liquid fuel required for testing. The gas 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 system; The first liquid nitrogen storage module (A) includes a first liquid nitrogen storage tank (A1) for storing liquid nitrogen; The second liquid nitrogen storage module (B) includes a second liquid nitrogen storage tank (B1) for storing liquid nitrogen; 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, Liquid nitrogen in the first liquid nitrogen storage tank (A1) 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).

2. The liquid oxygen-methane engine test stand according to claim 1, characterized in that, 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 tank (A1) 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 tank (B1) 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 the 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.

3. The liquid oxygen-methane engine test stand according to claim 2, 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.

4. The liquid oxygen-methane engine test stand according to claim 3, 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).

5. The liquid oxygen-methane engine test stand according to claim 4, 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).

6. The liquid oxygen-methane engine test stand according to claim 4, 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).

7. The liquid oxygen-methane engine test stand according to claim 6, 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).

8. The liquid oxygen-methane engine test stand according to claim 5 or 7, 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).

9. The liquid oxygen-methane engine test stand according to claim 6, 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 air distribution plate (D1) is connected to the first boosting module (E1) through the first boosting air supply line (d1) for boosting air 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 boosting gas supply.

10. The liquid oxygen-methane engine test stand according to claim 4, characterized in that, The liquid nitrogen in the first liquid nitrogen storage tank (A1) 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) through the liquid oxygen subcooler inlet pipeline (w1) for liquid oxygen subcooling. The liquid nitrogen in the second liquid nitrogen storage tank (B1) 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.

Images