Full-flow afterburning cycle engine double-half-system combined hot test device and hot test method

Abstract

The invention provides a full-flow afterburning cycle engine double-half-system combined hot test device and a hot test method. The full-flow afterburning cycle engine double-half-system combined hot test device comprises a fuel-rich half-system test unit and an oxygen-rich half-system test unit, the fuel-rich semi-system test unit comprises a fuel-rich generator, a turbine I, a fuel pump, a fuel-rich gas process spray pipe, a guide cylinder I and a fuel inlet pipeline; the oxygen-enriched semi-system test unit comprises an oxygen-enriched generator, a turbine II, an oxygen pump, an oxygen-enriched fuel gas process spray pipe, a guide cylinder II and an oxygen inlet pipeline, the problems that the fuel side supply pressure is too high and the test difficulty is large in a single oxygen-enriched semi-system thermal test are solved, the examination working condition is not limited by the inlet pressure, and all assemblies of the semi-system can be fully examined; and meanwhile, the gas emission safety in the test process is ensured through gas emission diversion.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine hot testing, and particularly relates to a combined hot testing device and method for a double half-system of a full-flow staged combustion cycle engine. Background Art

[0002] A full-flow staged combustion cycle engine includes an oxygen-rich half-system composed of an oxygen-rich gas generator and an oxidizer main turbopump, a fuel-rich half-system composed of a fuel-rich gas generator and a fuel main turbopump assembly, and components such as a thrust chamber. The oxygen-rich half-system can be hot-tested separately. However, at this time, since there is no fuel pump boost in the fuel path, a high inlet pressure needs to be directly supplied. When testing at 30% of the working condition, the fuel-side supply inlet pressure must reach above 20 MPa, and when testing at 100% of the working condition, the fuel-side supply inlet pressure must reach above 50 MPa, which requires a high requirement for the test bench supply system. When the supply capacity of the test bench cannot be met, the component performance cannot be fully evaluated. To fully evaluate the component performance, the whole engine can also be directly hot-tested. However, at this time, there are many components and the working process is complex, which will increase the test risk. Summary of the Invention

[0003] In order to overcome the deficiencies in the prior art, the inventor of the present invention has conducted intensive research and provided a combined hot testing device and method for a double half-system of a full-flow staged combustion cycle engine. The hot testing device includes the oxygen-rich half-system and the fuel-rich half-system in the full-flow staged combustion cycle engine, solves the problems of too high fuel-side supply pressure and great test difficulty in the hot testing of the single oxygen-rich half-system, the test working condition is not limited by the inlet pressure, the components of the half-system can be fully evaluated, and at the same time, the gas emission safety during the test process is ensured through gas emission diversion.

[0004] The technical solution provided by the present invention is as follows:

[0005] In a first aspect, a combined hot testing device for a double half-system of a full-flow staged combustion cycle engine includes:

[0006] including a fuel-rich half-system testing unit and an oxygen-rich half-system testing unit;

[0007] The fuel-rich half-system testing unit includes a fuel-rich generator, a turbine I, a fuel pump, a fuel-rich gas process nozzle, a guide cylinder I, and a fuel inlet pipeline;

[0008] The oxygen-rich half-system testing unit includes an oxygen-rich generator, a turbine II, an oxygen pump, an oxygen-rich gas process nozzle, a guide cylinder II, and an oxygen inlet pipeline;

[0009] The fuel inlet pipeline transports fuel gas to the fuel pump. The fuel pump transports the fuel in one way to the rich-burning generator for rich-burning combustion, and in another way to the oxygen-rich generator for oxygen-rich combustion. The rich-burning gas generated after the rich-burning combustion in the rich-burning generator drives the turbine I to rotate, and then successively passes through the rich-burning gas process nozzle and the guide cylinder I for discharge.

[0010] The oxygen inlet pipeline transports the oxidizer to the oxygen pump. The oxygen pump transports the oxidizer in one way to the rich-burning generator for rich-burning combustion, and in another way to the oxygen-rich generator for oxygen-rich combustion. The oxygen-rich gas generated after the oxygen-rich combustion in the oxygen-rich generator drives the turbine II to rotate, and then successively passes through the oxygen-rich gas process nozzle and the guide cylinder II for discharge.

[0011] In a second aspect, a method for the combined hot test of a dual-half system of a full-flow staged combustion cycle engine includes:

[0012] Filling and pre-cooling of the pipeline in front of the stop valve: The oxidizer is introduced into the oxygen inlet pipeline, and the fuel is introduced into the fuel inlet pipeline to fill the pipelines in front of the stop valves I, II, III, and IV with the propellant. If the oxidizer or fuel is a cryogenic propellant (liquid oxygen, methane propellant), the pipelines in front of the stop valves I, II, III, and IV are pre-cooled before pipeline filling.

[0013] Ignition of the generator: Open the stop valves I, II, III, and IV according to the timing to be tested. The oxidizer and fuel enter the oxygen-rich generator and the rich-burning generator to complete the ignition of the generator.

[0014] Condition transition: According to the test plan, conduct a fixed-condition hot test or a variable-condition hot test. When conducting a variable-condition hot test, adjustment elements need to be set in the supply paths of the oxygen-rich generator and the rich-burning generator.

[0015] Shutdown: Close the stop valves I, II, III, and IV according to the timing to be tested. The supply of the oxidizer and fuel to the oxygen-rich generator and the rich-burning generator stops, the condition of the test device drops, and it shuts down gradually.

[0016] Post-treatment: Drain the propellant from the oxygen inlet pipeline and the fuel inlet pipeline. The test device returns to room temperature under the action of the purge gas to complete the post-treatment.

[0017] According to the combined hot test device and method of a dual-half system of a full-flow staged combustion cycle engine provided by the present invention, the following beneficial effects are achieved:

[0018] (1) The combined hot test device and method of a dual-half system of a full-flow staged combustion cycle engine provided by the present invention. The hot test device includes the oxygen-rich half-system and the rich-burning half-system in the full-flow staged combustion cycle engine, which can solve the problems of too high supply pressure on the fuel side and great test difficulty in the hot test of the single oxygen-rich half-system. The test conditions are not restricted by the inlet pressure, and each component of the half-system can be fully tested.

[0019] (2) The double-half-system combined hot test device and hot test method for a full-flow staged combustion cycle engine provided by the present invention introduce the fuel-rich gas discharged from the draft tube I into a gas treatment device for combustion treatment. After sufficient chemical reactions, the exhaust gas is discharged into the atmosphere, or the fuel-rich gas is led to a distant place for discharge, or a physical isolation such as an isolation wall is provided between the draft tube I and the draft tube II to separately discharge the fuel-rich gas and the oxygen-rich gas, and the high-speed ejection at the outlets of the draft tube I and the draft tube II ensures safety. Description of the Drawings

[0020] Figure 1 It is a system diagram of the double-half-system combined hot test device for a full-flow staged combustion cycle engine;

[0021] Figure 2 It is a schematic diagram of gas discharge using physical isolation (isolation wall). Detailed Embodiments

[0022] The following is a detailed description of the present invention, and the features and advantages of the present invention will become clearer and more definite along with these descriptions.

[0023] Here, the special term "exemplary" means "serving as an example, embodiment or illustration". Any embodiment described as "exemplary" here does not have to be construed as superior to or better than other embodiments.

[0024] The present invention provides a double-half-system combined hot test device for a full-flow staged combustion cycle engine, as Figure 1 shown, which includes a fuel-rich half-system test unit and an oxygen-rich half-system test unit;

[0025] The fuel-rich half-system test unit includes a fuel-rich generator, a turbine I, a fuel pump, a fuel-rich gas process nozzle, a draft tube I and a fuel inlet pipeline;

[0026] The oxygen-rich half-system test unit includes an oxygen-rich generator, a turbine II, an oxygen pump, an oxygen-rich gas process nozzle, a draft tube II and an oxygen inlet pipeline;

[0027] The fuel inlet pipeline transports fuel gas to the fuel pump. The fuel pump transports the fuel in one path to the fuel-rich generator for fuel-rich combustion and in another path to the oxygen-rich generator for oxygen-rich combustion; the fuel-rich gas generated after the fuel-rich combustion in the fuel-rich generator drives the turbine I to rotate, and then sequentially passes through the fuel-rich gas process nozzle and the draft tube I for discharge;

[0028] The oxygen inlet pipeline transports an oxidant to the oxygen pump. The oxygen pump transports the oxidant in one path to the fuel-rich generator for fuel-rich combustion and in another path to the oxygen-rich generator for oxygen-rich combustion; the oxygen-rich gas generated after the oxygen-rich combustion in the oxygen-rich generator drives the turbine II to rotate, and then sequentially passes through the oxygen-rich gas process nozzle and the draft tube II for discharge.

[0029] In the present invention, a stop valve I and a throttle ring I are installed on the pipeline between the fuel pump and the fuel-rich generator. The stop valve I controls the on-off of the pipeline, and the throttle ring I controls the flow rate of the fuel flowing into the fuel-rich generator.

[0030] A stop valve II and a throttle ring II are installed on the pipeline between the fuel pump and the oxygen-rich generator. The stop valve II controls the on-off of the pipeline, and the throttle ring II controls the flow rate of the fuel flowing into the oxygen-rich generator.

[0031] A stop valve III and a throttle ring III are installed on the pipeline between the oxygen pump and the fuel-rich generator. The stop valve III controls the on-off of the pipeline, and the throttle ring III controls the flow rate of the oxidant flowing into the fuel-rich generator.

[0032] A stop valve IV and a throttle ring IV are installed on the pipeline between the oxygen pump and the oxygen-rich generator. The stop valve IV controls the on-off of the pipeline, and the throttle ring IV controls the flow rate of the oxidant flowing into the oxygen-rich generator.

[0033] In the present invention, a fuel pre-compression turbine pump is provided upstream of the fuel pump. The fuel pre-compression turbine pump pre-compresses the fuel from the initial fuel pressure (0.1 - 0.5 MPa) to 2 - 3 MPa, avoiding the fuel pump directly boosting the fuel from the initial pressure to 40 - 50 MPa, which may cause cavitation at the fuel pump inlet, structural damage, and obvious vibration during the test process.

[0034] An oxidant pre-compression turbine pump is provided upstream of the oxygen pump. The oxidant pre-compression turbine pump pre-compresses the oxidant from the initial fuel pressure (0.1 - 0.5 MPa) to 2 - 3 MPa, avoiding the oxygen pump directly boosting the oxidant from the initial pressure to 40 - 50 MPa, which may cause cavitation at the oxygen pump inlet, structural damage, and obvious vibration during the test process.

[0035] When conducting the combined thermal test of the double-half system, oxygen-rich gas and fuel-rich gas will be discharged simultaneously. From past experience, the safety of discharging oxygen-rich gas and fuel-rich gas separately is controllable, but when the two media are discharged simultaneously and meet, violent chemical reactions will occur, which is somewhat dangerous. Therefore:

[0036] (1) Since the fuel-rich gas is a combustible substance, the fuel-rich gas discharged from the draft tube I is introduced into the gas treatment device for combustion treatment. After sufficient chemical reaction, the exhaust gas can be discharged into the atmosphere.

[0037] (2) Alternatively, the fuel-rich gas can be led to a distant place for discharge, or a physical isolation such as a partition wall is set between the draft tube I and the draft tube II to separate the fuel-rich gas from the oxygen-rich gas for separate discharge. High-speed ejection at the outlets of the draft tube I and the draft tube II ensures safety, as Figure 2 shown.

[0038] The combined hot test device for the double-half system of a full-flow staged combustion cycle engine is used to simulate the actual operating conditions of the full-flow staged combustion cycle engine on the ground. Since there are still differences between the combined hot test device for the double-half system and the overall engine configuration, it is impossible to make all parameters exactly the same under the specified working conditions. Therefore, the following methods are used to determine the hot test conditions:

[0039] (1) Principle of working condition design: The pressures, turbine speeds, turbine pressure ratios, and pump Q / n parameters of the fuel-rich generator and the oxygen-rich generator are the same as those of the actual operating conditions of the overall engine;

[0040] (2) Method of working condition adjustment: To ensure that the ground test conditions can simulate the actual working conditions of the overall engine, the working condition configuration of the entire test device is completed by adjusting the diameter of the process nozzle and the pressure drop of the throttle ring.

[0041] The present invention also provides a combined hot test method for the double-half system of a full-flow staged combustion cycle engine, which is implemented by using the above-mentioned combined hot test device for the double-half system of a full-flow staged combustion cycle engine, and includes the following steps:

[0042] Step 1: Filling and pre-cooling of the pipeline before the stop valve. The oxidant is introduced into the oxygen inlet pipeline, and the fuel is introduced into the fuel inlet pipeline to ensure that the pipelines before the stop valves I, II, III, and IV are filled with the propellant.

[0043] If the oxidant or fuel is a cryogenic propellant (liquid oxygen, methane propellant), the pipeline filling requires pre-cooling of the pipelines before the stop valves I, II, III, and IV.

[0044] Step 2: Ignition of the generator. Open the stop valves I, II, III, and IV according to the sequence to be tested, and the oxidant and fuel enter the oxygen-rich generator and the fuel-rich generator to complete the ignition of the generator. For the combination of liquid oxygen and methane propellants, a torch ignition scheme is generally adopted, and then the working conditions are gradually increased to the steady state.

[0045] Step 3: Working condition transition. According to the test plan, fixed-condition hot tests or variable-condition hot tests can be carried out. When conducting variable-condition hot tests, adjustment elements such as throttle valves need to be set in the supply paths of the oxygen-rich generator and the fuel-rich generator.

[0046] Step 4: Shutdown. Close the stop valves I, II, III, and IV according to the sequence to be tested, stop supplying the oxidant and fuel to the oxygen-rich generator and the fuel-rich generator, the working conditions of the test device decrease, and it gradually shuts down.

[0047] Step 5: Post-treatment. Drain the propellant from the oxygen inlet pipeline and the fuel inlet pipeline, and the test device returns to room temperature under the action of the purge gas to complete the post-treatment.

[0048] The present invention has been described in detail above in connection with specific embodiments and exemplary examples, but these descriptions should not be construed as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, various equivalent substitutions, modifications or improvements can be made to the technical solutions of the present invention and their implementation manners, and these all fall within the scope of the present invention. The protection scope of the present invention shall be subject to the appended claims.

[0049] The content not detailedly described in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims

1. A dual-half system combined thermal test device for a full-flow regenerative combustion cycle engine, characterized in that: It includes a fuel-rich semi-system test unit and an oxygen-rich semi-system test unit; The rich fuel semi-system test unit includes a rich fuel generator, a turbine I, a fuel pump, a rich fuel gas process nozzle, a guide tube I and a fuel inlet pipeline; The oxygen-enriched semi-system test unit includes an oxygen-enriched generator, turbine II, oxygen pump, oxygen-enriched fuel gas process nozzle, draft tube II and oxygen inlet pipeline; The fuel inlet pipeline delivers the fuel gas to the fuel pump, and the fuel pump delivers the fuel to the rich fuel generator for rich fuel combustion in one way and to the oxygen-rich generator for oxygen-rich combustion in the other way; the rich fuel gas generated after the rich fuel combustion in the rich fuel generator drives the turbine I to rotate, and then is discharged through the rich fuel gas process nozzle and the guide tube I in sequence; The oxygen inlet pipeline transports the oxidant to the oxygen pump, and the oxygen pump transports the oxidant to the rich fuel generator for rich fuel combustion in one way and to the oxygen-rich generator for oxygen-rich combustion in the other way; the oxygen-rich combustion gas generated after the oxygen-rich combustion in the oxygen-rich generator drives the turbine II to rotate, and then is discharged through the oxygen-rich combustion gas process nozzle and the guide tube II in sequence.

2. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: A shut-off valve I and a throttle ring I are installed on the pipeline between the fuel pump and the rich fuel generator. The shut-off valve I controls the on-off of the pipeline, and the throttle ring I controls the flow of fuel entering the rich fuel generator.

3. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: A stop valve II and a throttle ring II are installed on the pipeline between the fuel pump and the oxygen-enriched generator. The stop valve II controls the on-off of the pipeline, and the throttle ring II controls the flow of the fuel entering the oxygen-enriched generator.

4. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: A stop valve III and a throttle ring III are installed on the pipeline between the oxygen pump and the rich fuel generator. The stop valve III controls the on-off of the pipeline, and the throttle ring III controls the flow of the oxidant entering the rich fuel generator.

5. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: A stop valve IV and a throttle ring IV are installed on the pipeline between the oxygen pump and the oxygen-enriched generator. The stop valve IV controls the on-off of the pipeline, and the throttle ring IV controls the flow of the oxidant entering the oxygen-enriched generator.

6. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: A fuel pre-compression turbine pump is arranged upstream of the fuel pump, and the fuel pre-compression turbine pump pre-compresses the fuel before it enters the fuel pump; An oxidant pre-pressure turbo pump is arranged upstream of the oxygen pump, and the oxidant pre-pressure turbo pump pre-presses the oxidant before it enters the oxygen pump.

7. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: The fuel-rich gas discharged from the guide tube I is introduced into the gas treatment device for combustion treatment, and the exhaust gas after combustion is discharged into the atmosphere; or The fuel-rich gas discharged from the guide tube I is discharged away from the discharge port of the guide tube II; or A physical isolation is provided between the guide tube I and the guide tube II so that the fuel-rich gas and the oxygen-rich gas are discharged separately.

8. The full-flow secondary combustion cycle engine dual-half system combined hot test device according to claim 1 is characterized in that: The pressure, turbine speed, turbine pressure ratio, and pump Q / n parameters of the fuel-rich generator and the oxygen-rich generator are the same as those of the actual operating conditions of the whole machine. The operating condition configuration of the entire test device is completed through the fuel-rich gas process nozzle diameter, the oxygen-rich gas process nozzle diameter, and the throttle ring pressure drop on the pipeline.

9. A method for joint hot testing of dual-half systems of a full-flow regenerative combustion cycle engine, characterized in that: include: Filling and precooling of the pipelines before the stop valves: oxidant is introduced into the oxygen inlet pipeline, and fuel is introduced into the fuel inlet pipeline, so that the pipelines before the stop valves I, II, III, and IV are filled with propellant; if the oxidant or fuel is a cryogenic propellant, the pipelines before the stop valves I, II, III, and IV are precooled before filling the pipelines; Generator ignition: Open the stop valves I, II, III, and IV in the order to be tested, and the oxidant and fuel enter the oxygen-rich generator and the fuel-rich generator to complete the generator ignition; Working condition transfer: According to the test plan, a fixed working condition hot test or a variable working condition hot test is carried out. During the variable working condition hot test, it is necessary to set regulating elements in the supply lines of the oxygen-rich generator and the fuel-rich generator; Shutdown: Close the stop valves I, II, III, and IV in the order to be tested, stop supplying the oxidant and fuel to the oxygen-rich generator and the fuel-rich generator, and gradually shut down the test device after the operating conditions decline; Post-processing: The propellant from the oxygen inlet pipeline and the fuel inlet pipeline is leaked out, the test device is warmed up under the action of the purge gas, and the post-processing is completed.

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