An engine post-test processing test tooling, simulation system, and simulation method

Abstract

The present invention relates to the post-test treatment of liquid rocket engines, and specifically to a test fixture, a simulation system, and a simulation method for post-test treatment of engines, which are used to solve the problem that the simulation model of kerosene diffusion in the post-test treatment of the existing engine gas cavity needs to be continuously improved, and the theoretical basis for optimizing the post-test treatment method of the engine is urgently needed to be verified by experiments. However, there are deficiencies in the high risk and high cost of testing the optimized scheme in the actual post-test treatment process of the engine. The test fixture for post-test treatment of this engine includes a housing, an injector simulation component, a rectifier simulation component, a bent pipe, a sampling interface, a purging interface, and a vacuum pumping interface. The present invention can be connected to a nitrogen purging system, a vacuum pumping system, a kerosene filling pipeline, and a kerosene drainage pipeline to conduct kerosene filling in the engine gas cavity before the test and simulate the post-test treatment. At the same time, the present invention also discloses an engine post-test treatment simulation system and an engine post-test treatment simulation system.

Description

Technical Field

[0001] The present invention relates to the post - test treatment of liquid rocket engines, and specifically to a test tooling, simulation system, and simulation method for post - test treatment of engines. Background Art

[0002] Due to the rapid start of liquid rocket engines, the temperature in the combustion chamber reaches a peak value, resulting in fuel sintering, oil scale, and other combustion products adhering to the combustion chamber wall. In addition, unburned kerosene adheres to the gas cavity. Therefore, when a liquid rocket engine faces continuous test runs, it is necessary to perform post - test treatment on its combustion chamber to ensure the cleanliness of the inner cavity of the combustion chamber for the safe progress of subsequent continuous test runs.

[0003] The process and steps of post - test treatment of engines are relatively complex. The method of combining normal - temperature nitrogen purging, hot - nitrogen purging, and vacuum suction is still based on traditional experience in the selection of purging time and pressure, vacuum suction time, and vacuum degree. As a result, the entire post - test treatment process is time - consuming and laborious, and cannot meet the requirements of high - frequency engine tests. At present, the simulation model for kerosene diffusion during the post - test treatment of the engine gas cavity is constantly being improved, and a theoretical basis for optimizing the post - test treatment method of the engine has been obtained, which urgently needs experimental verification. However, the risk and cost of testing the optimized scheme in the actual post - test treatment process of the engine are high. Therefore, a set of test systems and test methods are needed to experimentally verify the optimized post - test treatment scheme. Summary of the Invention

[0004] The object of the present invention is to solve the deficiencies that in the existing post - test treatment process of the engine gas cavity, the simulation model for kerosene diffusion is constantly being improved, a theoretical basis for optimizing the post - test treatment method of the engine has been obtained, which urgently needs experimental verification, but the risk and cost of testing the optimized scheme in the actual post - test treatment process of the engine are high. The present invention provides a test tooling, simulation system, and simulation method for post - test treatment of engines.

[0005] To solve the above - mentioned deficiencies of the existing technology, the present invention provides the following technical solutions:

[0006] A test tooling for post - test treatment of engines, characterized in that it includes a housing, an injector simulation part, a rectifier simulation part, a bent pipe, a sampling interface, and a purging interface and a vacuum pumping interface provided on the outer wall of the housing;

[0007] A first cavity, a second cavity, and a third cavity are respectively formed between the housing and the injector simulation part, between the injector simulation part and the rectifier simulation part, and between the rectifier simulation part and the housing;

[0008] The injector simulation part is used to simulate the flow and diffusion state of kerosene in the injector at the head of the engine combustion chamber during post - test treatment;

[0009] The rectifier simulator is used to simulate the flow and diffusion state of kerosene in the post-test treatment process in the engine gas chamber. A frustum is coaxially arranged inside the rectifier simulator. The small end of the frustum is close to the second cavity. A through hole is axially formed inside the frustum to form an inner cavity channel. An outer cavity channel is formed between the outer wall of the frustum and the inner wall of the rectifier simulator. A plurality of grid plates are arranged between the inner cavity channel and the outer cavity channel. An annular blind cavity is radially arranged on the inner wall of the inner cavity channel near the outlet; the inner cavity channel, the outer cavity channel are both communicated with the second cavity and the third cavity;

[0010] The elbow is used to simulate the volatilization and diffusion of the kerosene accumulated in the elbow and blind cavity structures in the engine gas chamber during the post-test treatment process. One end of the elbow is arranged on the outer wall of the injector simulator and communicated with the second cavity, and the other end is arranged on the outer wall of the rectifier simulator and communicated with the outer cavity channel;

[0011] The sampling interface is arranged on the outer wall of the rectifier simulator and communicated with the outer cavity channel;

[0012] The purging interface is communicated with the first cavity, and the vacuum pumping interface is communicated with the third cavity.

[0013] Furthermore, one end of the injector simulator is connected to the housing through a flange, the other end is connected to one end of the rectifier simulator through a flange, and the other end of the rectifier simulator is connected to the housing through a flange.

[0014] Meanwhile, the present invention provides an engine post-test treatment simulation system, which is characterized in that: it includes the above-mentioned engine post-test treatment test tooling, nitrogen purging system, glass observation tube, vacuum pumping system, kerosene filling pipeline, kerosene discharging pipeline and control system;

[0015] The nitrogen purging system is connected to the purging interface of the engine post-test treatment test tooling through the glass observation tube, and the outlet of the kerosene filling pipeline is arranged on the pipeline between the nitrogen purging system and the glass observation tube;

[0016] The vacuum pumping system is connected to the vacuum pumping interface of the engine post-test treatment test tooling, and the inlet of the kerosene discharging pipeline is arranged on the pipeline between the vacuum pumping system and the vacuum pumping interface of the engine post-test treatment test tooling;

[0017] The control system is respectively communicatively connected to the vacuum pumping system and the nitrogen purging system, and is used to control the operation of the nitrogen purging system and the vacuum pumping system.

[0018] Furthermore, a heater is arranged on the nitrogen purging system; the purging pressure is 0.1 - 2 MPa, and the purging temperature is from the ambient temperature to 110 °C;

[0019] The maximum suction capacity vacuum degree of the vacuum pumping system is 2.5 KPa.

[0020] The present invention also provides an engine post - test treatment simulation method, which is characterized in that the above - mentioned engine post - test treatment simulation system is adopted, and it includes the following steps:

[0021] Step 1: Measure the ambient temperature, keep the nitrogen purge system, the kerosene filling pipeline, and the kerosene drain pipeline closed. Open the vacuum pumping system through the control system, and vacuum the engine post - test treatment test tooling to a preset vacuum degree through the vacuum pumping interface; then close the vacuum pumping system through the control system;

[0022] Step 2: Open the kerosene filling pipeline for kerosene filling. Check the kerosene liquid level through the glass observation tube. After filling to the specified liquid level in the glass observation tube, let it stand still, and then close the kerosene filling pipeline; the kerosene used is the kerosene in the gas chamber drained after the actual engine test run;

[0023] Step 3: If no bubbles are generated in the glass observation tube within 3 minutes and the liquid level is stable at the specified liquid level, the kerosene filling is completed, and step 4 is executed; otherwise, return to step 2;

[0024] Step 4: Open the kerosene drain pipeline to let the kerosene in the engine post - test treatment test tooling flow out naturally; then open the nitrogen purge system through the control system, and purge according to the preset purge temperature and preset purge pressure to let the excess kerosene in the engine post - test treatment test tooling flow out until the mass difference between the engine post - test treatment test tooling and the engine post - test treatment test tooling before kerosene filling reaches the preset value, so as to ensure that the oil film thickness in the engine post - test treatment test tooling meets the test requirements. Subsequently, close the nitrogen purge system and the kerosene drain pipeline through the control system;

[0025] Step 5: Measure the temperature of the engine post - test treatment test tooling at this time. Then, after removing the nitrogen purge system, the vacuum pumping system, the kerosene filling pipeline, and the kerosene drain pipeline, place the engine post - test treatment test tooling in an incubator at the preset placement temperature for a preset test time;

[0026] Step 6: Conduct internal cavity purge gas sampling on the engine post - test treatment test tooling through the purge interface and the sampling interface, and detect the average total content of hydrocarbons in the purge gas, so as to verify whether the residual kerosene content in the engine post - test treatment test tooling meets the standard, and obtain the relationship between the ambient temperature, the preset vacuum degree, the preset purge temperature, the preset purge pressure, the temperature of the engine post - test treatment test tooling in step 5, the preset placement temperature, the preset test time, and the average total content of hydrocarbons in the purge gas, that is, the engine post - test treatment simulation is completed.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) An engine post - test treatment test tooling of the present invention includes a housing, an injector simulator, a rectifier simulator, an elbow pipe, a sampling interface, a purging interface, and a vacuum pumping interface; the present invention can be connected to a nitrogen purging system, a vacuum pumping system, a kerosene filling pipeline, and a kerosene discharging pipeline to perform kerosene filling in the engine gas chamber before the test and simulate the post - test treatment. Compared with the conventional method of directly pouring kerosene into the test tooling and then manually shaking it, the present invention can ensure that the inner surface of the tooling is evenly coated with kerosene and the thickness of the oil film, providing a guarantee for truly simulating the kerosene distribution in the engine gas chamber.

[0029] (2) An engine post - test treatment simulation system of the present invention includes an engine post - test treatment test tooling, a nitrogen purging system, a vacuum pumping system, a kerosene filling pipeline, a kerosene discharging pipeline, and a control system; this system can simulate the hot purging and vacuum pumping cycle process of the engine gas chamber during actual post - test treatment. The adjustable parameters include purging temperature, purging pressure, vacuum degree, ambient temperature, etc. That is, it can analyze the influence of a single factor on the average total content of hydrocarbons in the purging gas after the engine undergoes post - test treatment alone, and can also analyze the influence of combined multi - factors on the average total content of hydrocarbons in the purging gas after the engine undergoes post - test treatment. This system can study and verify the optimization schemes of different post - test treatment methods.

[0030] (3) An engine post - test treatment simulation system of the present invention reduces the test risk and cost compared with the actual engine post - test treatment process, and a constant - temperature box with a preset placement temperature can be used to shorten the test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of an embodiment of an engine post - test treatment test tooling;

[0032] Figure 2 is Figure 1 a schematic structural diagram of the rectifier in the embodiment;

[0033] Figure 3 It is a schematic structural diagram of an embodiment of an engine post - test treatment simulation system.

[0034] The description of the reference numerals in the drawings is as follows: 1 - housing; 2 - injector simulator; 3 - rectifier simulator, 31 - inner cavity channel, 32 - outer cavity channel, 33 - grid plate, 34 - annular blind cavity; 4 - elbow pipe; 5 - sampling interface; 6 - purging interface; 7 - vacuum pumping interface; 8 - first cavity; 9 - second cavity; 10 - third cavity; 11 - nitrogen purging system; 12 - vacuum pumping system; 13 - kerosene filling pipeline; 14 - kerosene discharging pipeline; 15 - control system; 16 - glass observation tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0036] Referring to Figure 1 , an after-treatment test tooling for an engine, comprising a housing 1, an injector simulation part 2, a rectifier simulation part 3, a bent pipe 4, a sampling interface 5, and a purge interface 6 and a vacuum pumping interface 7 provided on the outer wall of the housing 1.

[0037] The housing 1 is flange-connected to the injector simulation part 2, the injector simulation part 2 is flange-connected to the rectifier simulation part 3, and the rectifier simulation part 3 is flange-connected to the housing 1, and a first cavity 8, a second cavity 9, and a third cavity 10 are respectively formed.

[0038] The injector simulation part 2 is used to simulate the flow and diffusion state of kerosene in the post-treatment process in the injector at the head of the engine combustion chamber; the injector simulation part 2 has a typical structure and includes 64 nozzles evenly distributed in a circumferential direction.

[0039] Referring to Figure 2 , the rectifier simulation part 3 is used to simulate the flow and diffusion state of kerosene in the post-treatment process in the gas chamber of the engine. A frustum is coaxially arranged inside the rectifier simulation part 3. The small end of the frustum is close to the second cavity 9. A through hole is axially formed in the frustum to form an inner cavity 31. An outer cavity 32 is formed between the outer wall of the frustum and the inner wall of the rectifier simulation part 3. A plurality of grid plates 33 are arranged between the inner cavity 31 and the outer cavity 32. An annular blind cavity 34 is radially arranged on the inner wall of the inner cavity 31 near the outlet; the inner cavity 31, the outer cavity 32 are both communicated with the second cavity 9 and the third cavity 10; it includes coaxially arranged inner cavity 31 and outer cavity 32, a plurality of grid plates 33 are arranged between the inner cavity 31 and the outer cavity 32, and an annular blind cavity 34 is radially arranged on the inner cavity 31 near the outlet.

[0040] The bent pipe 4 is used to simulate the volatilization and diffusion of the kerosene accumulated in the bent pipe and blind cavity structure in the gas chamber of the engine during the post-treatment process. One end of the bent pipe 4 is arranged on the outer wall of the injector simulation part 2 and communicated with the second cavity 9, and the other end is arranged on the outer wall of the rectifier simulation part 3 and communicated with the outer cavity 32.

[0041] The sampling interface 5 is arranged on the outer wall of the rectifier simulation part 3 and communicated with the outer cavity 32.

[0042] The purge interface 6 is communicated with the first cavity 8, and the vacuum pumping interface 7 is communicated with the third cavity 10.

[0043] In this embodiment, the housing 1, the injector simulation part 2, and the rectifier simulation part 3 as a whole are cylindrical, with an axial length of 400 mm and a radius of 150 mm.

[0044] Meanwhile, the present invention discloses an engine post-test processing simulation system, including the above-mentioned engine post-test processing test tooling, a nitrogen purge system 11, a glass observation tube 16, a vacuum pumping system 12, a kerosene filling pipeline 13, a kerosene drain pipeline 14, and a control system 15, as Figure 3 shown.

[0045] The nitrogen purge system 11 is connected to the purge interface 6 of the engine post-test processing test tooling through the glass observation tube 16, and the outlet of the kerosene filling pipeline 13 is arranged on the pipeline between the nitrogen purge system 11 and the glass observation tube 16.

[0046] The vacuum pumping system 12 is connected to the vacuum pumping interface 7 of the engine post-test processing test tooling, and the inlet of the kerosene drain pipeline 14 is arranged on the pipeline between the vacuum pumping system 12 and the vacuum pumping interface 7 of the engine post-test processing test tooling.

[0047] The control system 15 is respectively communicatively connected to the vacuum pumping system 12 and the nitrogen purge system 11, and is used to control the nitrogen purge system 11 and the vacuum pumping system 12.

[0048] The present invention also discloses an engine post-test processing simulation method, which adopts the above-mentioned engine post-test processing simulation system, and includes the following steps:

[0049] Step 1: Measure the ambient temperature, keep the nitrogen purge system 11, the kerosene filling pipeline 13, and the kerosene drain pipeline 14 closed, turn on the vacuum pumping system 12 through the control system 15, and vacuum the engine post-test processing test tooling to a preset vacuum degree of 2.5 kPa through the vacuum pumping interface 7; turn off the vacuum pumping system 12 through the control system 15;

[0050] Step 2: Turn on the kerosene filling pipeline 13 to perform kerosene filling, check the kerosene liquid level through the glass observation tube 16, and after filling to the specified liquid level in the glass observation tube 16, let it stand still and turn off the kerosene filling pipeline 13; the kerosene used is the kerosene in the gas chamber drained after the actual engine test run.

[0051] Step 3: If no bubbles are generated in the glass observation tube 16 within 3 minutes and the liquid level is stable at the specified liquid level, the kerosene filling is completed, and step 4 is executed; otherwise, return to step 2;

[0052] Step 4: Open the kerosene drain pipeline 14 to allow the kerosene in the engine post-test treatment test tooling to flow out naturally; then turn on the nitrogen purge system 11 through the control system 15 and perform purging according to the preset purge temperature and preset purge pressure of 0.1 MPa to allow the excess kerosene in the engine post-test treatment test tooling to flow out until the mass difference between the engine post-test treatment test tooling and the engine post-test treatment test tooling before kerosene filling reaches the preset value, so as to ensure that the oil film thickness in the engine post-test treatment test tooling meets the test requirements. Subsequently, turn off the nitrogen purge system 11 and the kerosene drain pipeline 14 through the control system 15;

[0053] Step 5: Measure the temperature of the engine post-test treatment test tooling at this time. Then, after removing the nitrogen purge system 11, the vacuum pumping system 12, the kerosene filling pipeline 13, and the kerosene drain pipeline 14, place the engine post-test treatment test tooling in a constant temperature oven at the preset storage temperature for the preset test time of 10 h;

[0054] Step 6: Perform in-cavity purge gas sampling on the engine post-test treatment test tooling through the purge interface 6 and the sampling interface 5, and detect the average total content of hydrocarbons in the purge gas to verify whether the residual kerosene content in the engine post-test treatment test tooling meets the standard, and obtain the relationship between the ambient temperature, the preset vacuum degree, the preset purge temperature, the preset purge pressure, the temperature of the engine post-test treatment test tooling in Step 5, the preset storage temperature, the preset test time, and the average total content of hydrocarbons in the purge gas, that is, complete the engine post-test treatment simulation.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. For those of ordinary skill in the art, the specific technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be equivalently replaced. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. An after-treatment test tooling for an engine, characterized in that: it includes a housing (1), an injector simulation part (2), a rectifier simulation part (3), a bent pipe (4), a sampling interface (5), and a purge interface (6) and a vacuum pumping interface (7) provided on the outer wall of the housing (1); a first cavity (8), a second cavity (9), and a third cavity (10) are respectively formed between the housing (1) and the injector simulation part (2), between the injector simulation part (2) and the rectifier simulation part (3), and between the rectifier simulation part (3) and the housing (1); the injector simulation part (2) is used to simulate the flow and diffusion state of kerosene during the after-treatment process in the injector at the head of the engine combustion chamber; the rectifier simulation part (3) is used to simulate the flow and diffusion state of kerosene during the after-treatment process in the gas cavity of the engine. A frustum is coaxially arranged inside the rectifier simulation part (3). The small end of the frustum is close to the second cavity (9). A through hole is axially formed in the frustum to form an inner cavity channel (31). An outer cavity channel (32) is formed between the outer wall of the frustum and the inner wall of the rectifier simulation part (3). A plurality of grid plates (33) are arranged between the inner cavity channel (31) and the outer cavity channel (32). An annular blind cavity (34) is radially arranged on the inner wall of the inner cavity channel (31) near the outlet; the inner cavity channel (31), the outer cavity channel (32) are both communicated with the second cavity (9) and the third cavity (10); the bent pipe (4) is used to simulate the volatilization and diffusion of the kerosene accumulated in the bent pipe and blind cavity structure in the gas cavity of the engine during the after-treatment process. One end of the bent pipe (4) is arranged on the outer wall of the injector simulation part (2) and communicated with the second cavity (9), and the other end is arranged on the outer wall of the rectifier simulation part (3) and communicated with the outer cavity channel (32); the sampling interface (5) is arranged on the outer wall of the rectifier simulation part (3) and communicated with the outer cavity channel (32); the purge interface (6) is communicated with the first cavity (8), and the vacuum pumping interface (7) is communicated with the third cavity (10).

2. The after-treatment test tooling for an engine according to claim 1, characterized in that: one end of the injector simulation part (2) is connected to the housing (1) through a flange, the other end is connected to one end of the rectifier simulation part (3) through a flange, and the other end of the rectifier simulation part (3) is connected to the housing (1) through a flange.

3. An after-treatment simulation system for an engine, characterized in that: it includes the after-treatment test tooling for an engine according to claim 1, a nitrogen purge system (11), a glass observation tube (16), a vacuum pumping system (12), a kerosene filling pipeline (13), a kerosene discharge pipeline (14), and a control system (15); the nitrogen purge system (11) is connected to the purge interface (6) of the after-treatment test tooling for an engine through the glass observation tube (16), and the outlet of the kerosene filling pipeline (13) is arranged on the pipeline between the nitrogen purge system (11) and the glass observation tube (16); The vacuum pumping system (12) is connected to the vacuum interface (7) of the engine post-test treatment test tooling. The inlet of the kerosene discharge pipeline (14) is arranged on the pipeline between the vacuum pumping system (12) and the vacuum interface (7) of the engine post-test treatment test tooling. The control system (15) is respectively communicatively connected to the vacuum pumping system (12) and the nitrogen purging system (11) for controlling the operation of the nitrogen purging system (11) and the vacuum pumping system (12).

4. An engine post-test treatment simulation system according to claim 3, characterized in that: A heater is provided on the nitrogen purging system (11); the purging pressure is 0.1 - 2 MPa, and the purging temperature is from the ambient temperature to 110 °C; The maximum suction capacity vacuum degree of the vacuum pumping system (12) is 2.5 KPa.

5. An engine post-test treatment simulation method, characterized in that: The engine post-test treatment simulation system according to claim 3 is adopted, including the following steps: Step 1: Measure the ambient temperature, keep the nitrogen purging system (11), the kerosene filling pipeline (13), and the kerosene discharge pipeline (14) closed. Turn on the vacuum pumping system (12) through the control system (15), and vacuum the engine post-test treatment test tooling to a preset vacuum degree through the vacuum interface (7). Then turn off the vacuum pumping system (12). Step 2: Open the kerosene filling pipeline (13) for kerosene filling. Check the kerosene liquid level through the glass observation tube (16). After filling to the specified liquid level in the glass observation tube (16), let it stand and then close the kerosene filling pipeline (13); the kerosene used is the kerosene in the gas chamber discharged after the actual engine test run. Step 3: If there are no bubbles in the glass observation tube (16) within 3 minutes and the liquid level is stable at the specified liquid level, the kerosene filling is completed, and step 4 is executed; otherwise, return to step 2. Step 4: Open the kerosene discharge pipeline (14) to let the kerosene in the engine post-test treatment test tooling flow out naturally; then turn on the nitrogen purging system (11) through the control system (15) and perform purging according to the preset purging temperature and preset purging pressure to let the excess kerosene in the engine post-test treatment test tooling flow out until the mass difference between the engine post-test treatment test tooling and the engine post-test treatment test tooling before kerosene filling reaches the preset value to ensure that the oil film thickness in the engine post-test treatment test tooling meets the test requirements. Subsequently, turn off the nitrogen purging system (11) through the control system (15) and close the kerosene discharge pipeline (14). Step 5: Measure the temperature of the engine post-test treatment test tooling at this time. Then, after removing the nitrogen purging system (11), the vacuum pumping system (12), the kerosene filling pipeline (13), and the kerosene discharge pipeline (14), place the engine post-test treatment test tooling in a constant temperature box at the preset placement temperature for a preset test time. Step 6: Perform in-cavity purge gas sampling on the engine post-test treatment test tooling through the purge interface (6) and the sampling interface (5), and detect the average total content of hydrocarbons in the purge gas, so as to verify whether the residual kerosene content in the engine post-test treatment test tooling meets the standard, and obtain the relationship between the ambient temperature, the preset vacuum degree, the preset purge temperature, the preset purge pressure, the temperature of the engine post-test treatment test tooling in Step 5, the preset placement temperature, the preset test time and the average total content of hydrocarbons in the purge gas, that is, complete the engine post-test treatment simulation.

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