Liquid rocket engine nozzle atomization test device and method

Abstract

The invention relates to a liquid rocket engine nozzle atomization test device and a liquid rocket engine nozzle atomization test method, in particular to a liquid rocket engine nozzle atomization test device and a liquid rocket engine nozzle atomization test method which have high-frequency speed change pressure measurement capability in a back pressure environment, and solves the problem of supply of gas-liquid dual-path media when liquid rocket engine nozzle products are tested in a back pressure cabin. And the problems of high-frequency rapid change sensor sealing and sensor signal line leading-out in a back pressure environment are solved. According to the device, the split design idea is adopted, the test tool is divided into the upper cavity and the lower cavity, pre-tightening force is applied at a time through the fastener, three seals between the nozzle and the upper cavity and the lower cavity are completed at the same time, and the device is convenient to use and has the gas-liquid double-path supply capacity. According to the device, the sensor is sealed in the back pressure cabin through the sealing cavity, so that the pressure in the sealing cavity is always atmospheric pressure; a signal line of the sensor is led out from the interior of the cabin through the metal hose, and then sealing between the signal line and the back pressure cabin is completed through the switching section, so that no leakage of pressure in the cabin is ensured.

Description

Technical Field

[0001] This invention relates to a liquid rocket engine nozzle atomization test apparatus and method, and in particular to a liquid rocket engine nozzle atomization test apparatus and method with the capability of high-frequency rapid pressure measurement under back pressure environment. Background Technology

[0002] Nozzles are widely used in cryogenic bicomponent liquid rocket engines. The interaction between the gas and liquid phases causes droplets to detach from the liquid surface, enhancing combustion efficiency. However, when the gas-liquid two-phase flow system is disturbed, flow instability may occur. This is often assessed by measuring the high-frequency, rapidly varying pressure in the nozzle head cavity to detect pressure fluctuations during nozzle atomization tests.

[0003] Traditionally, liquid rocket engine nozzles are tested in ambient temperature environments. A few, requiring back pressure, are tested by installing the nozzle inside a pressure-reversing chamber, creating a back-pressure environment to more realistically simulate the nozzle's operation. Pressure measurement in back-pressure spray tests is mostly done indirectly, through pressure-measuring ports pre-installed on the pressure-reversing chamber. However, this method is susceptible to interference from the pressure-sensing pipe, affecting the accuracy of the test results.

[0004] To address this, this patent designs a split-type gas-liquid two-phase atomization test fixture. By applying a pre-tightening force, multiple seals are achieved, providing the nozzle with a dual-path gas-liquid medium supply capability. Through the design of the sensor sealing chamber, a high-frequency velocity pressure sensor is sealed inside the reverse pressure chamber, and the high-frequency rapid change sensor signal line is led out through a metal hose, ultimately realizing the direct measurement of the nozzle's high-frequency rapid change pressure in a reverse pressure environment. Currently, there is no similar lightweight and versatile device in China capable of direct pressure measurement in a reverse pressure environment. Therefore, it is necessary to propose a liquid rocket engine nozzle atomization test device and method with the capability of high-frequency rapid change pressure measurement in a reverse pressure environment. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art, solve the problem of supplying gas and liquid dual-path medium when liquid rocket engine nozzle products are tested in a reverse pressure chamber, and solve the problems of sealing high-frequency speed change sensor and leading out sensor signal line in reverse pressure environment.

[0006] The objective of this invention is achieved through the following technical solutions:

[0007] A liquid rocket engine nozzle atomization test device with high-frequency rapid pressure measurement capability under back pressure environment includes: a back pressure chamber, an actuator, a gas path metal hose, a liquid path metal hose, a liquid path inlet of the back pressure chamber, a gas path inlet of the back pressure chamber, and a nozzle atomization test device.

[0008] The nozzle atomization test device includes an adapter plate, an upper chamber, a liquid inlet connector, a high-frequency speed-varying sensor sealing chamber for the liquid path, a sealing gasket for the high-frequency speed-varying sensor sealing chamber for the liquid path, a high-frequency speed-varying sensor sealing gasket for the liquid path, a high-frequency speed-varying sensor for the liquid path, O-rings for sealing the upper and lower chambers, a lower chamber, fasteners for the high-frequency speed-varying sensor sealing chamber for the gas path, a high-frequency speed-varying sensor connector for the gas path, a high-frequency speed-varying sensor cable for the gas path, and a high-frequency speed-varying sensor for the gas path. Frequency conversion sensor sealing gasket, gas path high frequency conversion sensor sealing cavity sealing gasket, air inlet nozzle, liquid path nozzle, gas path nozzle, liquid path nozzle sealing gasket, gas path nozzle sealing gasket, gas path transition section plug, gas path transition straight pipe section, gas path nozzle, gas path transition section reducer, gas path transition section ball head, gas path transition section outer nut and bolt; liquid path transition section plug, liquid path transition straight pipe section, liquid path nozzle, liquid path transition section reducer, liquid path transition section ball head, liquid path transition section outer nut and bolt.

[0009] The nozzle atomization test device is connected to the actuator via an adapter plate and fixed inside the pressure chamber; the upper and lower chambers are sealed together.

[0010] The upper cavity is equipped with a liquid inlet nozzle on its side, which is connected to the liquid inlet of the anti-pressure tank; the lower cavity is equipped with an air inlet nozzle on its side, which is connected to the liquid inlet of the anti-pressure tank's air passage.

[0011] The upper cavity has a liquid path high-frequency speed change sensor interface on its side. The liquid path high-frequency speed change sensor is screwed to the upper cavity interface and sealed by the liquid path high-frequency speed change sensor sealing gasket. The lower cavity has a gas path high-frequency speed change sensor interface on its side. The gas path high-frequency speed change sensor is screwed to the lower cavity interface and sealed by the gas path high-frequency speed change sensor sealing gasket.

[0012] The sealing cavity of the liquid circuit high-frequency speed change sensor is used to seal the liquid circuit high-frequency speed change sensor; the sealing cavity of the liquid circuit high-frequency speed change sensor is connected to the upper cavity; the sealing cavity of the gas circuit high-frequency speed change sensor is used to seal the gas circuit high-frequency speed change sensor; the sealing cavity of the gas circuit high-frequency speed change sensor is connected to the lower cavity through the gas circuit high-frequency speed change sensor sealing cavity fastener.

[0013] The high-frequency speed change sensor sealing cavity of the liquid circuit is welded with a high-frequency speed change sensor connector. The high-frequency speed change sensor connector is connected to a DN4 metal hose to protect the high-frequency speed change sensor wire and lead it out of the counter-pressure chamber. The sealing gasket of the high-frequency speed change sensor sealing cavity is placed in the groove on the side of the upper cavity to achieve the seal between the high-frequency speed change sensor sealing cavity and the upper cavity.

[0014] The gas path high-frequency speed change sensor sealing cavity is welded with a gas path high-frequency speed change sensor connector. The gas path high-frequency speed change sensor connector is connected to a DN4 metal hose to protect the gas path high-frequency speed change sensor wire and lead it out of the back pressure chamber. The gas path high-frequency speed change sensor sealing cavity sealing gasket is placed in the groove on the side of the lower cavity to achieve the seal between the gas path high-frequency speed change sensor sealing cavity and the lower cavity.

[0015] The test was conducted using a combination of liquid nozzles and gas nozzles. The liquid nozzles were sealed with liquid nozzle sealing gaskets, and the gas nozzles were sealed with gas nozzle sealing gaskets. The upper and lower chambers were sealed by the two sealing gaskets respectively. Liquid was supplied through the upper chamber and gas was supplied through the lower chamber.

[0016] The gas path transition section plug is sealed to the gas path transition straight pipe section; the gas path nozzle is welded to the gas path transition section plug, continuing to lead out the gas path high-frequency rapid change sensor wire; the gas path transition section ball head is welded to the gas path transition straight pipe section through the gas path transition section reducer pipe, and the gas path transition section outer nut is connected to the reserved joint on the reverse pressure chamber, realizing the lead-out of the gas path high-frequency rapid change sensor wire outside the chamber, while simultaneously using the gas path transition section plug to seal the pressure inside the reverse pressure chamber; the liquid path transition section plug is sealed to the liquid path transition straight pipe section; the liquid path nozzle is welded to the liquid path transition section plug, continuing to lead out the liquid path high-frequency rapid change sensor wire; the liquid path transition section ball head is welded to the liquid path transition straight pipe section through the liquid path transition section reducer pipe, and the liquid path transition section outer nut is connected to the reserved joint on the reverse pressure chamber, realizing the lead-out of the liquid path high-frequency rapid change sensor wire outside the chamber, while simultaneously using the liquid path transition section plug to seal the pressure inside the reverse pressure chamber.

[0017] A test method based on the above-mentioned liquid rocket engine nozzle atomization test device includes:

[0018] Use the adapter plate fasteners to connect the adapter plate to the upper cavity, and then connect the connected upper and lower cavities to the actuator in the anti-pressure chamber.

[0019] Lead out the high-frequency speed change sensor wires of the liquid path and the high-frequency speed change sensor of the gas path, and pass them out of the cabin in advance through the gas path transition section and the liquid flow transition section.

[0020] Connect the ball joint of the liquid circuit transition section to the reserved interface on the top cover of the reverse pressure chamber through the outer nut of the liquid circuit transition section; similarly, connect the ball joint of the gas circuit transition section to the reserved interface on the top cover of the reverse pressure chamber through the outer nut of the gas circuit transition section.

[0021] The plug of the gas transition section is connected to the straight section of the gas transition pipe; the plug of the liquid transition section is connected to the straight section of the liquid transition pipe.

[0022] Connect the high-frequency speed change sensor lines for the liquid path and the high-frequency speed change sensor lines for the gas path, which have already been led out of the cabin, to the measurement and control equipment.

[0023] Connect the DN10 liquid inlet metal hose to the liquid inlet nozzle on the upper cavity, and connect the DN10 air inlet metal hose to the air inlet nozzle on the lower cavity; supply the medium through the liquid inlet and air inlet of the pressure chamber.

[0024] Start the air and liquid inlet system, adjust the liquid flow and air flow through the regulating valve of the upstream system, and adjust the pressure inside the reverse pressure chamber to the preset value through the regulating valve of the upstream system and the regulating valve of the downstream system of the reverse pressure chamber. Conduct the test according to the preset working conditions, and record parameters such as test flow and pressure inside the reverse pressure chamber.

[0025] After the test, close the upstream regulating valve, release the pressure inside the chamber through the counter-pressure chamber exhaust valve, open the counter-pressure chamber, then separate the upper and lower chambers, replace the product, connect the upper and lower chambers, close the counter-pressure chamber, and continue the test until the test is completed.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] (1) The device of the present invention adopts the design concept of splitting, dividing the test fixture into upper and lower cavities. Pre-tightening force is applied at one time through fasteners, and three seals are completed at the same time between the nozzle and the upper and lower cavities. It is convenient to use and has the ability to supply gas and liquid in both directions.

[0028] (2) The device of the present invention is provided with a high-frequency rapid change sensor sealing cavity, which seals the sensor in the anti-pressure chamber, so that the pressure in the sealing cavity is always atmospheric pressure, thus solving the problem of pressure bearing and waterproof sealing of the sensor in the chamber.

[0029] (3) The present invention uses a metal flexible tube to lead the sensor signal line out from the cabin, and then uses a transition section to complete the seal between the sensor and the pressure chamber, ensuring that the signal line is led out from the cabin while the pressure inside the cabin does not leak, thus solving the problem of leading out the sensor signal line.

[0030] (4) The method concept of this invention is universal. The method of this patent can realize the direct measurement of the internal pressure of the pressure vessel, avoiding the test error caused by indirect pressure measurement by equipment such as pressure chambers. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall composition of the test system of the present invention;

[0032] Figure 2 This is a cross-sectional view of the experimental apparatus of the present invention;

[0033] Figure 3 This is an overall external view of the experimental device of the present invention;

[0034] Figure 4 This is a diagram of the gas path transition section of the present invention;

[0035] Figure 5 This is a diagram of the fluid circuit transition section of the present invention.

[0036] Reference numerals: 1-Pressure chamber; 2-Actuator; 3-Gas metal hose; 4-Liquid metal hose; 5-Pressure chamber liquid inlet; 6-Pressure chamber gas inlet; 7-Adapter plate; 8-Adapter plate fastener; 9-Upper cavity; 10-Liquid inlet connector; 11-Liquid high-frequency rapid change sensor sealing cavity; 12-Liquid high-frequency rapid change sensor connector; 13-Liquid high-frequency rapid change sensor sealing cavity fastener; 14-Liquid high-frequency rapid change sensor sealing cavity 15 - Sealing gasket for the high-frequency speed change sensor in the liquid path; 16 - High-frequency speed change sensor in the liquid path; 17 - High-frequency speed change sensor cable in the liquid path; 18 - Upper and lower cavity sealing O-rings; 19 - Lower cavity; 20 - Fastener for the sealing cavity of the high-frequency speed change sensor in the gas path; 21 - Sealing cavity of the high-frequency speed change sensor in the gas path; 22 - Connecting nozzle for the high-frequency speed change sensor in the gas path; 23 - High-frequency speed change sensor cable in the gas path; 24 - High-frequency speed change sensor in the gas path; 25 - High-frequency speed change sensor in the gas path 26 - Sensor sealing gasket; 27 - Gas path high-frequency rapid change sensor sealing cavity sealing gasket; 28 - Air inlet nozzle; 29 - Liquid path nozzle; 30 - Liquid path nozzle sealing gasket; 31 - Gas path nozzle sealing gasket; 32 - Upper and lower cavity fasteners; 33 - Liquid path high-frequency rapid change sensor sealing cavity reinforcing fasteners; 34 - Gas path high-frequency rapid change sensor sealing cavity reinforcing fasteners; 35 - Gas path transition section plug; 36 - Gas path transition section fastener; 37 - Gas path 38 - Gas transition gasket; 39 - Gas transition straight pipe section; 40 - Gas transition reducer; 41 - Gas transition ball head; 42 - Gas transition outer nut; 43 - Liquid transition plug; 44 - Liquid transition fastener; 45 - Liquid transition gasket; 46 - Liquid transition straight pipe section; 47 - Liquid nozzle; 48 - Liquid transition reducer; 49 - Liquid transition ball head; 50 - Liquid transition outer nut. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0038] A liquid rocket engine nozzle atomization test system, such as Figure 1 As shown, it includes a pressure chamber 1, an actuator 2, a gas metal hose 3, a liquid metal hose 4, a pressure chamber liquid inlet 5, a pressure chamber gas inlet 6, and a nozzle atomization test device.

[0039] Cross-sectional view of the nozzle atomization test device is shown below. Figure 2 As shown in the figure, the overall outline of the nozzle atomization test device is as follows: Figure 3 As shown.

[0040] The nozzle atomization test device includes an adapter plate 7, adapter plate fasteners 8, an upper cavity 9, a liquid inlet connector 10, a high-frequency rapid change sensor sealing cavity 11, a high-frequency rapid change sensor connector 12, a high-frequency rapid change sensor sealing cavity fastener 13, a high-frequency rapid change sensor sealing cavity gasket 14, a high-frequency rapid change sensor sealing cavity gasket 15, a high-frequency rapid change sensor 16, a high-frequency rapid change sensor cable 17, upper and lower cavity sealing O-rings 18, a lower cavity 19, a high-frequency rapid change sensor sealing cavity fastener 20, a high-frequency rapid change sensor sealing cavity 21, a high-frequency rapid change sensor connector 22, a high-frequency rapid change sensor cable 23, a high-frequency rapid change sensor 24, a high-frequency rapid change sensor sealing cavity gasket 25, and a high-frequency rapid change sensor sealing cavity gasket. 26. Gasket 27. Air inlet nozzle 28. Liquid nozzle 29. Gas nozzle 30. Liquid nozzle sealing gasket 31. Gas nozzle sealing gasket 32. Upper and lower cavity fasteners 33. Liquid high-frequency speed change sensor sealing cavity reinforcing fasteners 34. Gas transition section plug 35. Gas transition section fasteners 36. Gas transition section sealing gaskets 37. Gas transition straight pipe section 38. Gas nozzle 39. Gas transition section reducing pipe 40. Gas transition section ball head 41. Gas transition section outer nut 42. Liquid transition section plug 43. Liquid transition section fasteners 44. Liquid transition section sealing gaskets 45. Liquid transition straight pipe section 46. Liquid nozzle 47. Liquid transition section reducing pipe 48. Liquid transition section ball head 49. Liquid transition section outer nut 50.

[0041] The nozzle atomization test device is connected to the actuator 2 via the adapter plate 7 and the adapter plate fastener 8, and is fixed in the counter-pressure chamber 1. The upper cavity 9 and the lower cavity 19 are connected by the upper and lower cavity fasteners 32. The upper and lower cavity sealing O-rings 18 are placed in the O-ring groove at the top of the lower cavity 19, and the upper and lower cavity sealing O-rings 18 are used to achieve a seal between the upper cavity 9 and the lower cavity 19.

[0042] The upper cavity 9 is equipped with a liquid inlet nozzle 10 on its side. The liquid inlet nozzle 10 is connected to the liquid inlet 5 of the counterpressure tank via a DN10 metal hose, enabling liquid supply. The lower cavity 19 is equipped with an air inlet nozzle 27 on its side. The air inlet nozzle 27 is connected to the air inlet 6 of the counterpressure tank via a DN10 metal hose, enabling gas supply.

[0043] The upper cavity 9 has a liquid path high-frequency speed change sensor interface on its side. The liquid path high-frequency speed change sensor 16 is screwed to the upper cavity interface and sealed by the liquid path high-frequency speed change sensor sealing gasket 15. The lower cavity 19 has a gas path high-frequency speed change sensor interface on its side. The gas path high-frequency speed change sensor 24 is screwed to the lower cavity interface and sealed by the gas path high-frequency speed change sensor sealing gasket 25.

[0044] The sealing cavity 11 of the liquid circuit high-frequency speed change sensor is used to seal the liquid circuit high-frequency speed change sensor 16. The sealing cavity 11 of the liquid circuit high-frequency speed change sensor is connected to the upper cavity 9 through the liquid circuit high-frequency speed change sensor sealing cavity fastener 13. The sealing cavity 21 of the gas circuit high-frequency speed change sensor is used to seal the gas circuit high-frequency speed change sensor 24. The sealing cavity 21 of the gas circuit high-frequency speed change sensor is connected to the lower cavity 19 through the gas circuit high-frequency speed change sensor sealing cavity fastener 20. The liquid circuit high-frequency speed change sensor sealing cavity reinforcing fastener 33 and the gas circuit high-frequency speed change sensor sealing cavity reinforcing fastener 34 are used to strengthen the fastening effect.

[0045] The sealing gasket 14 of the high-frequency speed change sensor sealing cavity is placed in the groove on the side of the upper cavity 9 to achieve the sealing between the high-frequency speed change sensor sealing cavity 11 and the upper cavity 9.

[0046] The high-frequency speed change sensor sealing cavity 21 of the gas path is welded with a gas path high-frequency speed change sensor connector 22, which is connected to a DN4 metal hose to protect the gas path high-frequency speed change sensor wire 23 and lead it out of the counter-pressure chamber 1. The gas path high-frequency speed change sensor sealing cavity sealing gasket 26 is placed in the groove on the side of the lower cavity 19 to achieve a seal between the gas path high-frequency speed change sensor sealing cavity 21 and the lower cavity 19.

[0047] The test was conducted by combining the liquid nozzle 28 and the gas nozzle 29. The liquid nozzle 28 was sealed by the liquid nozzle sealing gasket 30, and the gas nozzle 29 was sealed by the gas nozzle sealing gasket 31. The upper cavity and the lower cavity were sealed by the two sealing gaskets respectively. Liquid was supplied through the upper cavity and gas was supplied through the lower cavity.

[0048] The gas transition section plug 35 is connected to the gas transition straight pipe section 38 via the gas transition section fastener 36 and sealed by the gas transition section sealing gasket 37. The gas connection nozzle 39 is welded to the gas transition section plug 35, continuing to lead out the gas high-frequency rapid change sensor line 23. The gas transition section ball head 41 is welded to the gas transition straight pipe section 38 via the gas transition section reducer 40, and the gas transition section outer nut 42 is connected to the reserved joint on the counter-pressure chamber 1, finally realizing the lead-out of the gas high-frequency rapid change sensor line 23 outside the chamber, while simultaneously sealing the pressure inside the counter-pressure chamber using the gas transition section plug 35. Similarly, the liquid transition section plug 43 is connected to the liquid transition straight pipe section 46 via the liquid transition section fastener 44 and sealed by the liquid transition section sealing gasket 45. The fluid line nozzle 47 is welded to the fluid line transition section plug 43, and the fluid line high-frequency rapid change sensor line 17 is led out. The fluid line transition section ball head 49 is welded to the fluid line transition straight pipe section 46 through the fluid line transition section reducer pipe 48. The fluid line transition section outer sleeve nut 50 is connected to the reserved joint on the counterpressure chamber 1, thus realizing the lead-out of the fluid line high-frequency rapid change sensor line 17 outside the chamber. At the same time, the fluid line transition section plug 43 is used to seal the pressure inside the counterpressure chamber. Figure 4 This is a diagram of the gas path transition section of the present invention; Figure 5 This is a diagram of the fluid circuit transition section of the present invention.

[0049] A test method for atomization of a liquid rocket engine nozzle, the working process of which is as follows:

[0050] a. Place the gas nozzle sealing gasket 31 into the sealing groove of the lower cavity 19. Place the gas nozzle 29 into the lower cavity 19.

[0051] b. Place the liquid nozzle 28 inside the gas nozzle 29 and place the liquid nozzle sealing gasket 30 on the sealing platform of the liquid nozzle.

[0052] c. Place the upper and lower cavity sealing O-rings 18 into the sealing groove of the lower cavity 19, align the upper and lower cavities, and then use the upper and lower cavity fasteners 32 to tighten them. Apply pre-tightening force at one time to compress the three sealing gaskets: the upper and lower cavity sealing O-rings 18, the liquid path nozzle sealing gasket 30, and the gas path nozzle sealing gasket 31.

[0053] d. Place the sealing gasket 15 of the liquid path high-frequency speed change sensor and the sealing gasket 25 of the gas path high-frequency speed change sensor in the sensor sealing grooves on the side walls of the upper chamber 9 and the lower cavity 19, respectively. Then screw the liquid path high-frequency speed change sensor 16 and the gas path high-frequency speed change sensor 24 into the upper chamber 9 and the lower cavity 19, respectively.

[0054] e. Place the sealing gasket 14 of the liquid path high-frequency speed change sensor sealing cavity and the sealing gasket 26 of the gas path high-frequency speed change sensor sealing cavity into the sealing grooves of the sensor sealing cavities on the side walls of the upper cavity 9 and the lower cavity 19. Then, use the liquid path high-frequency speed change sensor sealing cavity fastener 13 and the gas path high-frequency speed change sensor sealing cavity fastener 20 to connect and fix the liquid path high-frequency speed change sensor sealing cavity 11 and the gas path high-frequency speed change sensor sealing cavity 21 to the upper cavity 9 and the lower cavity 19, respectively. Then, use the liquid path high-frequency speed change sensor sealing cavity reinforcing fastener 33 and the gas path high-frequency speed change sensor sealing cavity reinforcing fastener 34 to further strengthen the fastening effect.

[0055] f. Use the adapter plate fastener 8 to connect the adapter plate 7 to the upper cavity 9, and then connect the connected upper and lower cavities to the actuator 2 in the anti-pressure chamber 1.

[0056] g. Lead out the high-frequency speed change sensor line 17 of the liquid path and the high-frequency speed change sensor line 23 of the gas path through the high-frequency speed change sensor connector 12 of the liquid path and the high-frequency speed change sensor connector 22 of the gas path, and pass them out of the cabin in advance through the gas path transition section and the liquid flow transition section.

[0057] h. Connect the ball joint 49 of the liquid circuit transition section to the reserved interface on the top cover of the counterpressure chamber 1 via the outer nut 50 of the liquid circuit transition section. Similarly, connect the ball joint 41 of the gas circuit transition section to the reserved interface on the top cover of the counterpressure chamber 1 via the outer nut 42 of the gas circuit transition section.

[0058] i. Place the gasket 37 of the gas transition section into the sealing groove of the flange of the gas transition straight pipe section 38, and connect the gas transition section plug 35 to the gas transition straight pipe section 38 through the gas transition section fastener 36. Similarly, place the gasket 45 of the liquid transition section into the sealing groove of the flange of the liquid transition straight pipe section 46, and connect the liquid transition section plug 43 to the liquid transition straight pipe section 46 through the liquid transition section fastener 44.

[0059] j. Connect the liquid path high-frequency speed change sensor line 17 and the gas path high-frequency speed change sensor line 23, which have been led out of the cabin, to the measurement and control equipment.

[0060] k. Connect the DN10 liquid inlet hose to the liquid inlet nozzle 10 on the upper cavity 9, and connect the DN10 air inlet hose to the air inlet nozzle 27 on the lower cavity 19. Supply the medium through the liquid inlet 5 and the air inlet 6 of the counterpressure chamber 1.

[0061] 1. Start the air and liquid inlet system, adjust the liquid flow and air flow through the regulating valve of the upstream system, and adjust the pressure inside the reverse pressure chamber 1 to 4MPa through the regulating valve of the upstream system and the regulating valve of the downstream system of the reverse pressure chamber. Conduct the test according to the preset working conditions, and record the test flow, reverse pressure chamber pressure and other parameters.

[0062] m. After the test, close the upstream regulating valve, release the pressure inside the chamber through the counter-pressure chamber exhaust valve, open the counter-pressure chamber, then separate the upper and lower chambers. After replacing the product, connect the upper and lower chambers, close the counter-pressure chamber, and continue the test until the test is completed.

[0063] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0064] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A liquid rocket engine nozzle atomization test device with high-frequency rapid pressure measurement capability under back pressure environment, characterized in that, include: The reverse pressure chamber (1), the actuator (2), the gas path metal hose (3), the liquid path metal hose (4), the reverse pressure chamber liquid path inlet (5), the reverse pressure chamber gas path liquid path inlet (6), and the nozzle atomization test device; The nozzle atomization test device includes an adapter plate (7), an upper chamber (9), a liquid inlet connector (10), a liquid path high-frequency speed change sensor sealing chamber (11), a liquid path high-frequency speed change sensor sealing chamber gasket (14), a liquid path high-frequency speed change sensor sealing gasket (15), a liquid path high-frequency speed change sensor (16), upper and lower chamber sealing O-rings (18), a lower chamber (19), a gas path high-frequency speed change sensor sealing chamber fastener (20), a gas path high-frequency speed change sensor sealing chamber (21), a gas path high-frequency speed change sensor connector (22), a gas path high-frequency speed change sensor wire (23), a gas path high-frequency speed change sensor (24), and a gas path high-frequency speed change sensor sealing gasket (25). 5) Gas path high-frequency speed change sensor sealing cavity sealing gasket (26), air inlet pipe nozzle (27), liquid path nozzle (28), gas path nozzle (29), liquid path nozzle sealing gasket (30), gas path nozzle sealing gasket (31), gas path transition section plug (35), gas path transition straight pipe section (38), gas path nozzle (39), gas path transition section reducer (40), gas path transition section ball head (41), gas path transition section outer sleeve nut (42), liquid path transition section plug (43), liquid path transition straight pipe section (46), liquid path nozzle (47), liquid path transition section reducer (48), liquid path transition section ball head (49), liquid path transition section outer sleeve nut (50); The nozzle atomization test device is connected to the actuator (2) via the adapter plate (7) and fixed inside the counter-pressure chamber (1); the upper cavity (9) and the lower cavity (19) are sealed together. The upper cavity (9) is equipped with a liquid inlet nozzle (10) on its side, which is connected to the liquid inlet (5) of the anti-pressure tank liquid passage; the lower cavity (19) is equipped with an air inlet nozzle (27) on its side, which is connected to the liquid inlet (6) of the anti-pressure tank air passage; The upper cavity (9) has a liquid path high-frequency speed change sensor interface on its side. The liquid path high-frequency speed change sensor (16) is screwed to the upper cavity interface and sealed by the liquid path high-frequency speed change sensor sealing gasket (15). The lower cavity (19) has a gas path high-frequency speed change sensor interface on its side. The gas path high-frequency speed change sensor (24) is screwed to the lower cavity interface and sealed by the gas path high-frequency speed change sensor sealing gasket (25). The liquid path high-frequency speed change sensor sealing cavity (11) is used to seal the liquid path high-frequency speed change sensor (16); the liquid path high-frequency speed change sensor sealing cavity (11) is connected to the upper cavity (9); the gas path high-frequency speed change sensor sealing cavity (21) is used to seal the gas path high-frequency speed change sensor (24); the gas path high-frequency speed change sensor sealing cavity (21) is connected to the lower cavity (19) through the gas path high-frequency speed change sensor sealing cavity fastener (20); A high-frequency speed change sensor connector (12) is welded onto the sealing cavity (11) of the high-frequency speed change sensor in the liquid circuit. The high-frequency speed change sensor connector (12) is connected to a DN4 metal hose to protect the high-frequency speed change sensor wire (17) and lead it out of the pressure chamber. The sealing gasket (14) of the high-frequency speed change sensor sealing cavity is placed in the groove on the side of the upper cavity (9) to achieve the seal between the high-frequency speed change sensor sealing cavity (11) and the upper cavity (9). The gas path high-frequency speed change sensor sealing cavity (21) is welded with a gas path high-frequency speed change sensor connector (22), which is connected to a DN4 metal hose to protect the gas path high-frequency speed change sensor wire (23) and lead it out of the counter-pressure chamber (1); the gas path high-frequency speed change sensor sealing cavity sealing gasket (26) is placed in the groove on the side of the lower cavity (19) to achieve the seal between the gas path high-frequency speed change sensor sealing cavity (21) and the lower cavity (19); The test was carried out by combining the liquid nozzle (28) and the gas nozzle (29). The liquid nozzle (28) was sealed by the liquid nozzle sealing gasket (30), and the gas nozzle (29) was sealed by the gas nozzle sealing gasket (31). The upper cavity and the lower cavity were sealed by the two sealing gaskets respectively. Liquid was supplied through the upper cavity and gas was supplied through the lower cavity. The gas path transition section plug (35) is sealed to the gas path transition straight pipe section (38); the gas path connector (39) is welded to the gas path transition section plug (35) to continue leading out the gas path high-frequency speed change sensor line (23); the gas path transition section ball head (41) is welded to the gas path transition straight pipe section (38) through the gas path transition section reducer (40), and the gas path transition section outer nut (42) is connected to the reserved joint on the counter-pressure chamber (1) to realize the lead-out of the gas path high-frequency speed change sensor line (23) outside the chamber, and at the same time, the gas path transition section plug (35) is used to complete the sealing of the pressure inside the counter-pressure chamber. Seal; the plug (43) of the liquid circuit transition section is sealed to the straight pipe section (46) of the liquid circuit transition section; the nozzle (47) of the liquid circuit is welded to the plug (43) of the liquid circuit transition section, and the high-frequency speed change sensor line (17) of the liquid circuit continues to be led out; the ball head (49) of the liquid circuit transition section is welded to the straight pipe section (46) of the liquid circuit transition section through the reducer pipe (48) of the liquid circuit transition section, and the outer nut (50) of the liquid circuit transition section is connected to the reserved joint on the pressure chamber (1), so as to realize the lead-out of the high-frequency speed change sensor line (17) of the liquid circuit outside the chamber, and at the same time, the pressure inside the pressure chamber is sealed by using the plug (43) of the liquid circuit transition section.

2. The liquid rocket engine nozzle atomization test apparatus according to claim 1, characterized in that, The nozzle atomization test device also includes a high-frequency speed change sensor connector (12) and a high-frequency speed change sensor wire (17). The high-frequency speed change sensor connector (12) is welded onto the high-frequency speed change sensor sealing cavity (11). The high-frequency speed change sensor connector (12) is connected to a DN4 metal hose to protect the high-frequency speed change sensor wire (17) and lead it out of the pressure chamber.

3. The liquid rocket engine nozzle atomization test apparatus according to claim 1, characterized in that, The nozzle atomization test device also includes a high-frequency speed change sensor sealing cavity fastener (13), and the high-frequency speed change sensor sealing cavity (11) is connected to the upper cavity (9) through the high-frequency speed change sensor sealing cavity fastener (13).

4. The liquid rocket engine nozzle atomization test apparatus according to claim 1, characterized in that, The nozzle atomization test device also includes upper and lower cavity sealing O-rings (18). The upper and lower cavity sealing O-rings (18) are placed in the O-ring groove at the top of the lower cavity (19) to achieve a seal between the upper cavity (9) and the lower cavity (19).

5. The liquid rocket engine nozzle atomization test apparatus according to claim 1, characterized in that, The nozzle atomization test device also includes a gas path transition section fastener (36) and a gas path transition section sealing gasket (37); the gas path transition section plug (35) is connected to the gas path transition straight pipe section (38) through the gas path transition section fastener (36) and sealed through the gas path transition section sealing gasket (37).

6. The liquid rocket engine nozzle atomization test apparatus according to claim 1, characterized in that, The nozzle atomization test device also includes a liquid circuit transition section fastener (44) and a liquid circuit transition section sealing gasket (45); the liquid circuit transition section plug (43) is connected to the liquid circuit transition straight pipe section (46) through the liquid circuit transition section fastener (44) and sealed through the liquid circuit transition section sealing gasket (45).

7. The liquid rocket engine nozzle atomization test apparatus according to claim 1, characterized in that, The nozzle atomization test device also includes a liquid path high-frequency speed change sensor sealing cavity reinforcing fastener (33) and a gas path high-frequency speed change sensor sealing cavity reinforcing fastener (34); the liquid path high-frequency speed change sensor sealing cavity reinforcing fastener (33) and the gas path high-frequency speed change sensor sealing cavity reinforcing fastener (34) are used to strengthen the fastening effect.

8. A test method based on the liquid rocket engine nozzle atomization test apparatus of claim 1, characterized in that, include: Use the adapter plate fastener (8) to connect the adapter plate (7) to the upper cavity (9), and then connect the connected upper and lower cavities to the actuator (2) in the anti-pressure chamber (1); Lead out the high-frequency speed change sensor line (17) of the liquid path and the high-frequency speed change sensor (23) of the gas path, and pass them out of the cabin in advance through the gas path transition section and the liquid flow transition section; Connect the ball head (49) of the liquid circuit transition section to the reserved interface on the top cover of the counter-pressure chamber (1) through the outer nut (50) of the liquid circuit transition section; similarly, connect the ball head (41) of the gas circuit transition section to the reserved interface on the top cover of the counter-pressure chamber (1) through the outer nut (42) of the gas circuit transition section. The gas transition section plug (35) is connected to the gas transition straight pipe section (38); the liquid transition section plug (43) is connected to the liquid transition straight pipe section (46); Connect the liquid path high-frequency speed change sensor line (17) and the gas path high-frequency speed change sensor line (23), which have been led out of the cabin, to the measurement and control equipment. Connect the DN10 liquid inlet metal hose to the liquid inlet nozzle (10) on the upper cavity (9), and connect the DN10 air inlet metal hose to the air inlet nozzle (27) on the lower cavity (19); supply the medium through the liquid inlet (5) and air inlet (6) of the pressure chamber (1). Start the air and liquid intake system, adjust the liquid flow and air flow through the regulating valve of the upstream system, and adjust the pressure inside the reverse pressure chamber (1) to the preset value through the regulating valve of the upstream system and the regulating valve of the downstream system of the reverse pressure chamber. Conduct the test according to the preset working conditions, and record the test flow, reverse pressure chamber pressure and other parameters. After the test, close the upstream regulating valve, release the pressure inside the chamber through the counter-pressure chamber exhaust valve, open the counter-pressure chamber, then separate the upper and lower chambers, replace the product, connect the upper and lower chambers, close the counter-pressure chamber, and continue the test until the test is completed.

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