Full-flow afterburning cycle engine self-pressurization semi-system hot test device and method

Abstract

The invention provides a full-flow afterburning cycle engine self-pressurization semi-system hot test device and method, and a test bench small-flow propellant supply system in the device is connected with a booster pump through a pipeline, and conveys a small-flow propellant to the booster pump. The booster pump conveys the supercharged small-flow propellant to a fuel gas generator or a pipeline for precooling and then discharging the supercharged small-flow propellant; the test bed large-flow propellant supply system is connected with the main pump through a pipeline, large-flow propellants are conveyed to the main pump, and the main pump conveys the pressurized large-flow propellants to the fuel gas generator or the pipeline to be pre-cooled and then discharged. The turbine is connected with the main pump, the main pump is connected with the booster pump through a coupler, and a dynamic seal is arranged between the main pump and the booster pump; a large-flow propellant and a small-flow propellant in the gas generator are ignited by the ignition device, gas at an outlet of the gas generator drives the turbine to rotate and then is discharged from the process spray pipe, the turbine rotates and drives the main pump and the booster pump to rotate at the same time, and the large-flow propellant and the small-flow propellant are supplied in a pressurized mode at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of engine thermal testing, and in particular relates to a full-flow secondary combustion cycle engine self-supercharging semi-system thermal testing device and method. Background Art

[0002] During the design process of liquid rocket engines, verification tests generally follow the order of component level-semi-system level-full system level hot test. The semi-system level hot test can assess the joint work of the gas generator and the turbo pump. The full-flow regenerative cycle engine is mainly composed of an oxygen-rich semi-system and a fuel-rich semi-system. When conducting an oxygen-rich semi-system hot test, the fuel pump belonging to the fuel-rich semi-system cannot be configured, or when conducting a fuel-rich semi-system hot test, the oxygen pump belonging to the oxygen-rich semi-system cannot be configured. Both have the problem of small-flow propellant circuits (fuel circuits for oxygen-rich semi-system hot tests, oxidizer circuits for fuel-rich semi-system hot tests) being unable to supply.

[0003] In the face of the above problems, the existing fuel circuit adopts a high-pressure fuel supply method. Considering that this solution requires the test bench to be equipped with a high-pressure fuel (small-flow propellant) supply system, it has high requirements for the test system. For high-performance full-flow regenerative cycle engines, the gas generator chamber pressure can reach more than 40MPa. Considering that the circuit is equipped with a regulating valve, a certain pressure drop is required, as well as the generator injector pressure drop. At this time, the test bench high-pressure small-flow propellant supply system tank pressure is required to be much higher than this pressure, and the construction cost of the high-pressure propellant supply system is very high. Therefore, the use of this solution often requires reducing the test conditions to reduce the pressure requirements for the test bench high-pressure propellant supply system, and high-condition testing cannot be achieved.

[0004] Therefore, it is necessary to provide a semi-system hot test device and method for a full-flow regenerative cycle engine to solve the problem of difficulty in supplying small-flow propellant for hot testing of oxygen-rich or fuel-rich semi-system of a full-flow regenerative cycle system, so that the full-flow regenerative cycle semi-system is not restricted by the test bench and can realize full-condition test. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the inventors have conducted intensive research and provided a full-flow regenerative cycle engine self-pressurizing semi-system hot test device and method, which solves the problem of small-flow propellant supply difficulty in oxygen-rich or rich-fuel semi-system hot tests of full-flow regenerative cycle systems without adopting a high-pressure fuel supply method.

[0006] The technical solution provided by the present invention is as follows:

[0007] In the first aspect, a full-flow staged combustion cycle engine self-pressurizing semi-system hot test device includes a test bench low-flow propellant supply system, a test bench high-flow propellant supply system, an ignition device, a gas generator, a turbine, a main pump, a booster pump, a dynamic seal and a coupling;

[0008] The test bench small flow propellant supply system is connected to the booster pump through a pipeline to deliver the small flow propellant to the booster pump, and the booster pump delivers the pressurized small flow propellant to the gas generator or discharges it after completing pipeline precooling;

[0009] The test bench high-flow propellant supply system is connected to the main pump through a pipeline to deliver the high-flow propellant to the main pump, which delivers the pressurized high-flow propellant to the gas generator or discharges it after precooling the pipeline;

[0010] The turbine is connected to the main pump, the main pump is connected to the booster pump through a coupling, and a dynamic seal is arranged between the main pump and the booster pump;

[0011] The large-flow propellant and the small-flow propellant in the gas generator are ignited by the ignition device. The gas at the outlet of the gas generator drives the turbine to rotate and then is discharged from the process nozzle. The rotation of the turbine drives the main pump and the booster pump to rotate at the same time, implementing the simultaneous pressurized supply of large-flow propellant and small-flow propellant.

[0012] The large-flow propellant is an oxidant in the oxygen-rich half system and a fuel in the fuel-rich half system; the small-flow propellant is a fuel in the oxygen-rich half system and an oxidant in the fuel-rich half system.

[0013] In a second aspect, a full-flow secondary combustion cycle engine self-pressurization semi-system hot test method comprises:

[0014] Open stop valve II and stop valve IV, close stop valve I and stop valve III, and precool the pipeline from the test bench's large-flow propellant supply system to the pipeline before stop valve I, and the pipeline from the test bench's small-flow propellant supply system to the pipeline before stop valve III;

[0015] After reaching the precooling temperature, stop valves I and III are opened in sequence, and stop valves II and IV are closed at the same time, and large-flow propellant and small-flow propellant enter the gas generator in sequence and are ignited by the ignition device;

[0016] Adjust the flow rate of the regulating valve so that the small flow rate of propellant supply meets the requirements of the semi-system test and enter the semi-system test condition;

[0017] After the test, close stop valve I and stop valve III in sequence.

[0018] A full-flow secondary combustion cycle engine self-pressurization semi-system hot test device and method provided by the present invention has the following beneficial effects:

[0019] (1) The present invention provides a full-flow regenerative cycle engine self-pressurization semi-system hot test device and method, in which the turbine is connected in series with the main pump, and the main pump is connected in series with the booster pump. When the turbine rotates, the main pump and the booster pump are driven to rotate, so that the flow rates of large-flow propellant and small-flow propellant increase synchronously with the increase of the turbine speed, and the self-pressurization of large-flow propellant and small-flow propellant is achieved. Under the premise of not using a high-pressure fuel supply method, the problem of the difficulty in supplying small-flow propellant in the hot test of the full-flow regenerative cycle system with oxygen-rich or rich-fuel semi-system is solved;

[0020] (2) The present invention provides a full-flow regenerative cycle engine self-boosting semi-system hot test device and method. Since the power of the boosting pump accounts for a small proportion of the power of the turbine and the main pump, the impact on the turbine and the main pump is small, and the operating conditions of the turbine, the main pump and the gas generator are basically unaffected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The schematic diagram shows the structural relationship of a self-pressurizing semi-system hot test device for a full-flow secondary combustion cycle engine. DETAILED DESCRIPTION

[0022] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0023] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0024] The present invention provides a full-flow combustion cycle engine self-pressurization semi-system hot test device, such as Figure 1 As shown, it includes a test bench low-flow propellant supply system, a test bench high-flow propellant supply system, an ignition device, a gas generator, a turbine, a main pump, a booster pump, a dynamic seal and a coupling.

[0025] The small-flow propellant supply system of the test bench is connected to the booster pump through pipeline 6 to transport the small-flow propellant to the booster pump. A regulating valve 8 is installed on the main pipeline 7 after the booster pump to adjust the flow of the small-flow propellant. The main pipeline 7 is connected to two branch pipelines. One pipeline transports the pressurized small-flow propellant to the gas generator through the stop valve III 9, and the other branch pipeline discharges the pressurized small-flow propellant through the stop valve IV 11.

[0026] The test bench high-flow propellant supply system is connected to the main pump through pipeline 1 to transport the high-flow propellant to the main pump. The main pipeline 2 after the main pump is connected to two branch pipelines. One pipeline transports the pressurized high-flow propellant to the gas generator through stop valve I 3, and the other branch pipeline discharges the pressurized high-flow propellant through stop valve II 5.

[0027] The turbine is connected to the main pump through a spline; the main pump is connected to the booster pump in series, and the main pump shaft is connected to the booster pump shaft through a coupling. A dynamic seal is set between the main pump and the booster pump to prevent the main pump medium from meeting the booster pump medium. The booster pump can be a single-stage pump or a multi-stage pump.

[0028] The large-flow propellant and small-flow propellant in the gas generator are ignited by the ignition device. The gas at the gas generator outlet drives the turbine to rotate and is discharged from the process nozzle. The rotation of the turbine drives the main pump and the booster pump to rotate at the same time, thereby realizing the simultaneous pressurized supply of large-flow propellant and small-flow propellant.

[0029] In the self-pressurizing semi-system hot test device of the present invention, the small-flow propellant path (the fuel path of the oxygen-rich semi-system hot test, the oxidant path of the fuel-rich semi-system hot test) does not need to adopt the high-pressure fuel supply method. By connecting the booster pump in series with the main turbine pump, the gas generated by the gas generator drives the main pump and the booster pump to rotate while driving the turbine to rotate, thereby realizing the self-pressurization of large-flow propellant and small-flow propellant, solving the problem of the difficulty of supplying small-flow propellant in the hot test of the oxygen-rich or fuel-rich semi-system of the full-flow regenerative cycle system, so that the full-flow regenerative cycle semi-system is not limited by the test bench and can realize full-condition test.

[0030] The present invention also provides a full-flow secondary combustion cycle engine self-pressurization semi-system hot test method, comprising the following steps:

[0031] (1) Precooling discharge.

[0032] The test bench high-flow propellant supply system and the test bench low-flow propellant supply system are both low-pressure (0.1-1.0 MPa) supply systems; the stop valve II 5 and the stop valve IV 11 are opened, the stop valve I 3 and the stop valve III 9 are closed, and the pipeline from the test bench high-flow propellant supply system to the stop valve I 3 and the pipeline from the test bench low-flow propellant supply system to the stop valve III 9 are precooled. At this time, the regulating valve 8 is in a large flow resistance state.

[0033] Of course, the test bench small flow propellant supply system can also use a high pressure (10-20MPa) supply system. In this case, the booster pump is equivalent to a semi-boosting system, and the booster pump head requirement is reduced. For example: the test bench small flow propellant system tank pressure is 20MPa, the test condition requires the booster pump outlet pressure to be 60MPa, at this time the booster pump inlet pressure is 20MPa, and the booster pump head is 40MPa.

[0034] (2) After reaching the precooling temperature, open the valves one by one.

[0035] The stop valve I 3 and the stop valve III 9 are opened in sequence, and the stop valve II 5 and the stop valve IV 11 are closed at the same time. The large-flow propellant and the small-flow propellant enter the gas generator in sequence and are ignited by the ignition device.

[0036] (3) Working condition transfer

[0037] The regulating valve 8 changes from a large flow resistance state to a small flow resistance state, so that the small flow rate propellant supply meets the semi-system test requirements and enters the semi-system test condition.

[0038] (4) End of the test

[0039] After the test, close stop valve I 3 and stop valve III 9 in sequence.

[0040] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0041] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A full-flow secondary combustion cycle engine self-pressurization semi-system hot test device, characterized in that: It includes the test bench low-flow propellant supply system, the test bench high-flow propellant supply system, the ignition device, the gas generator, the turbine, the main pump, the booster pump, the dynamic seal and the coupling; The test bench small flow propellant supply system is connected to the booster pump through a pipeline to deliver the small flow propellant to the booster pump, and the booster pump delivers the pressurized small flow propellant to the gas generator or discharges it after completing pipeline precooling; The test bench high-flow propellant supply system is connected to the main pump through a pipeline to deliver the high-flow propellant to the main pump, which delivers the pressurized high-flow propellant to the gas generator or discharges it after precooling the pipeline; The turbine is connected to the main pump, the main pump is connected to the booster pump through a coupling, and a dynamic seal is arranged between the main pump and the booster pump; The large-flow propellant and the small-flow propellant in the gas generator are ignited by the ignition device. The gas at the outlet of the gas generator drives the turbine to rotate and then is discharged from the process nozzle. The rotation of the turbine drives the main pump and the booster pump to rotate at the same time, implementing the simultaneous pressurized supply of large-flow propellant and small-flow propellant. The large-flow propellant is an oxidant in the oxygen-rich half system and a fuel in the fuel-rich half system; the small-flow propellant is a fuel in the oxygen-rich half system and an oxidant in the fuel-rich half system.

2. The full-flow secondary combustion cycle engine self-pressurization semi-system hot test device according to claim 1 is characterized in that: A regulating valve is installed on the main pipe after the booster pump to adjust the flow rate of the small-flow propellant.

3. The full-flow secondary combustion cycle engine self-pressurization semi-system hot test device according to claim 2 is characterized in that: The main pipeline after the booster pump is connected to two branch pipelines, one pipeline transports the pressurized small-flow propellant to the gas generator through the stop valve III, and the other branch pipeline discharges the pressurized small-flow propellant through the stop valve IV.

4. The full-flow secondary combustion cycle engine self-pressurization semi-system hot test device according to claim 3 is characterized in that: The main pipeline after the main pump is connected to two branch pipelines, one pipeline transports the pressurized large-flow propellant to the gas generator through the stop valve I, and the other branch pipeline discharges the pressurized large-flow propellant through the stop valve II.

5. The full-flow secondary combustion cycle engine self-pressurization semi-system hot test device according to claim 4 is characterized in that: The booster pump is a single-stage pump or a multi-stage pump.

6. A full-flow combustion cycle engine self-supercharging semi-system hot test method, characterized in that: The full-flow secondary combustion cycle engine self-pressurization semi-system hot test device according to claim 5 comprises: Open stop valve II and stop valve IV, close stop valve I and stop valve III, and precool the pipeline from the test bench's large-flow propellant supply system to the pipeline before stop valve I, and the pipeline from the test bench's small-flow propellant supply system to the pipeline before stop valve III; After reaching the precooling temperature, stop valves I and III are opened in sequence, and stop valves II and IV are closed at the same time, and large-flow propellant and small-flow propellant enter the gas generator in sequence and are ignited by the ignition device; Adjust the flow rate of the regulating valve so that the small flow rate of propellant supply meets the requirements of the semi-system test and enter the semi-system test condition; After the test, close stop valve I and stop valve III in sequence.

7. The full-flow secondary combustion cycle engine self-supercharging semi-system hot test method according to claim 6 is characterized in that: The test bench high-flow propellant supply system and the test bench low-flow propellant supply system are both low-pressure supply systems, and the low pressure is 0.1-1.0 MPa.

8. The full-flow secondary combustion cycle engine self-supercharging semi-system hot test method according to claim 6 is characterized in that: The test bench small flow rate propellant supply system is a high pressure supply system, and the high pressure is 10-20 MPa.

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