Supersonic separation line spray pipe capable of measuring pressure distribution of inner wall surface under multiple swing angles

Abstract

The invention discloses a supersonic speed separation line nozzle capable of measuring inner wall surface pressure intensity distribution under multiple swing angles, and belongs to the field of nozzle performance testing. The device comprises a fixed section assembly, a separation section assembly and a spray pipe connecting and sealing device, the fixed section assembly and the separation section assembly are in sealed connection through a spray pipe connection sealing device; different spray pipe swing angles are realized by replacing different separation section assemblies; the left end face of the separation section shell is of a circular truncated cone structure, the axis of the circular truncated cone structure and the axis of the main body structure of the separation section shell form an angle, and after the separation section assembly and the fixed section assembly are installed in a matched mode through an annular positioning belt and an annular positioning groove which are coaxial with the circular truncated cone structure, the axis of the fixed section assembly and the axis of the separation section assembly can form a needed swing angle. The invention further discloses a test system built based on the supersonic speed separation line spray pipe and a test method of the test system. The pressure distribution condition of the inner wall surface of the nozzle at different swing angles can be measured, so that the flow state in the nozzle is analyzed, and the influence of the swing angles on the working performance of the supersonic separation line nozzle is analyzed.

Description

Technical Field

[0001] The present invention relates to a supersonic separation line nozzle capable of measuring the pressure distribution on the inner wall at multiple swing angles. The nozzle adopts a modular design, and different nozzle swing angles can be achieved by replacing one component. Moreover, a large amount of test data can be obtained in one hot run test, belonging to the field of nozzle testing. Background Art

[0002] A supersonic separation line nozzle is a vectoring nozzle in which the boundary between the fixed and movable sections lies within the supersonic region of the nozzle. Compared to subsonic separation line nozzles, these nozzles offer a number of advantages, including fewer components, simpler structure, higher deflection efficiency, and the ability to reduce the size of the engine's rear opening. They will play a significant role in attitude control for missiles and kinetic interceptors. For hypersonic vehicles operating in thin atmospheres, thrust vectoring is particularly difficult to replace and is crucial for missile weapons to maintain their designed trajectory.

[0003] Unlike ordinary Laval nozzles, the flow field in the supersonic separation line nozzle is more complex. In addition to the changes in parameters such as the separation line gap and position that affect the flow of gas inside the nozzle, the size of the separation line nozzle's swing angle is also an important factor affecting the flow field in the nozzle, thereby changing its thrust vectoring performance. However, most domestic research on this nozzle is in the simulation calculation stage, and very few hot test runs have been carried out. Therefore, a supersonic separation line nozzle with a fixed swing angle is designed, and a hot test run is carried out to measure the pressure distribution on the nozzle inner wall at different swing angles, and then analyze the flow state in the nozzle. It has great scientific research value to explore the influence of the swing angle on the working performance of the supersonic separation line nozzle. Summary of the Invention

[0004] The purpose of the present invention is to provide a supersonic separation line nozzle that can measure the inner wall pressure distribution at multiple swing angles, measure the inner wall pressure distribution of the nozzle at different swing angles, and then analyze the flow state in the nozzle, explore the influence of the swing angle on the working performance of the supersonic separation line nozzle, and solve engineering problems related to the application of supersonic separation line nozzles.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] The present invention discloses a supersonic separation line nozzle for measuring the pressure distribution of the inner wall under multiple swing angles, comprising a fixed section assembly, a separation section assembly and a nozzle connection sealing device; the fixed section assembly and the separation section assembly are sealed and connected via the nozzle connection sealing device; different separation section assemblies are replaced to achieve different nozzle swing angles; the left end face of the separation section shell is a frustum structure, the axis of which forms a certain angle with the axis of the separation section shell main structure, after the separation section assembly and the fixed section assembly are installed through an annular positioning belt and an annular positioning groove coaxial with the frustum structure, the axis of the fixed section assembly and the axis of the separation section assembly will form the required angle, if different swing angles are to be achieved, only different separation section assemblies need to be processed, and the separation section assembly and the fixed section assembly can be assembled to meet the test requirements.

[0007] Furthermore, the fixed section assembly includes a front fixed section insulation sleeve, a rear fixed section insulation sleeve, a fixed section shell, a pressure pipe seat and a pressure pipe seat joint;

[0008] Furthermore, the left end of the fixed section shell is installed at the outlet of the combustion chamber device through a threaded connection, and a step is machined inside the shell to limit the insulation sleeve; the front fixed section insulation sleeve and the rear fixed section insulation sleeve are clearance-fitted with the fixed section shell, and sealant needs to be applied to the gap during assembly; the function of the insulation sleeve is to provide thermal protection for the metal shell, and the second function is to form the nozzle convergence section, throat and part of the initial expansion section profile; a number of fixed section pressure measuring holes are opened at the nozzle inlet and downstream of the nozzle throat of the fixed section shell; a pressure pipe seat joint is welded on each fixed section pressure measuring hole, and the pressure pipe seat joint and the pressure pipe seat are sealed by a set of standard pipe connectors. A pressure collection device is installed on each pressure pipe seat, whose function is to draw out the gas to reduce the temperature and avoid the pressure sensor from directly contacting the high-temperature gas and being burned.

[0009] Furthermore, the separation section assembly includes a ferrule straight-through connector, a pressure measuring tube, a separation section welding flange, a separation section insulation sleeve, a separation section insulation sleeve retaining ring and a separation section shell; the separation section insulation sleeve is inserted into the tail of the separation section shell for installation, and its function is to provide thermal protection for the separation section shell and to constitute the main profile of the nozzle expansion section; the separation section welding flange is fixed to the tail of the separation section shell by welding, and its function is to be connected to the separation section insulation sleeve retaining ring through eight groups of bolts to achieve fixed limitation of the separation section insulation sleeve; a number of separation section pressure measuring holes are opened on the separation section shell, and a pressure measuring tube is welded to each separation section pressure measuring hole; a ferrule straight-through connector is installed on the top of the pressure measuring tube, and the other end of the pressure lead tube connected through the ferrule straight-through connector is connected to the sixteen-channel pressure scanning valve to realize integrated measurement of the nozzle inner wall pressure, and is also used to prevent the gas temperature from being too high and burning the scanning valve.

[0010] Furthermore, the nozzle connection sealing device includes a clamp and an O-ring; during installation, the annular positioning belt on the left end face of the separation section assembly is inserted into the annular positioning groove of the fixed section assembly. The annular positioning groove not only plays a positioning role for the installation of the separation section assembly, but also achieves good sealing performance by compressing the O-ring, thereby ensuring the air tightness of the nozzle connection during the hot run test; the clamp is processed with a V-groove, and when the two contact end faces of the fixed section assembly and the separation section assembly are aligned, the V-grooves on the two clamps circumferentially clamp the conical structure at the contact end faces of the assembly, and then two sets of bolts are used to tighten the two clamps. The clamp squeezes the conical structure to apply an axial preload force to the connection of the assembly, thereby compressing the O-ring and causing it to deform, further ensuring the sealing of the nozzle.

[0011] Furthermore, the right end of the rear fixed section insulation sleeve is processed into a male spherical surface, and the left end of the separation section shell and the separation section insulation sleeve is processed into a corresponding female spherical surface, and the assembled separation section assembly must ensure the continuity of the female spherical surface. A certain gap will be left when the male and female spherical surfaces are matched, and its function is to ensure the internal flow field structure of the ball-and-socket type supersonic separation line nozzle during actual operation.

[0012] Furthermore, there are three fixed section pressure measuring holes, one located at the nozzle inlet, and the other two symmetrically distributed near the throat of the nozzle initial expansion section.

[0013] Furthermore, the pressure measuring holes of the separation section are arranged in the upper, lower and right sides of the separation section assembly, with a total of thirteen pressure measuring holes in three rows. One more pressure measuring hole is set near the nozzle separation line without affecting the subsequent nozzle assembly.

[0014] The present invention discloses a test system based on a supersonic separation line nozzle, which also includes a combustion chamber device, a pressure acquisition system, and an ignition control system. The combustion chamber device includes a combustion chamber shell and a propellant grain. The grain burns in the combustion chamber to generate a large amount of gas and heat, providing working fluid and energy for the engine operation process. The pressure acquisition system includes a pressure sensor, a pressure signal transmission line, a pressure lead pipe, a 16-channel pressure scanning valve of the acquisition instrument, a network cable, and a computer terminal. Its function is to collect the pressure signal of the inner wall of the nozzle during the test and generate a pressure curve. The ignition control system includes an ignition control device and an ignition signal transmission line. Its function is to realize remote control of engine ignition.

[0015] The supersonic separation line nozzle is installed to the outlet of the combustion chamber device through threaded connection to form a complete engine, and then the engine as a whole is fixed on the test bench; then the calibrated pressure sensor is installed on the corresponding sensor base of the engine, and the pressure signal transmission line led out by the pressure sensor is connected to the collector; the sixteen-channel pressure scanning valve and the ferrule straight-through connector on the nozzle are flexibly connected by a pressure lead pipe, and the collected pressure data is transmitted to the computer terminal by a network cable; finally, the ignition signal transmission line between the ignition control equipment and the combustion chamber device is connected.

[0016] The present invention also discloses a test method for measuring the inner wall pressure of a supersonic separation line nozzle during a hot test. The test is performed based on the test system. The test method is implemented as follows:

[0017] After the test system is built;

[0018] All personnel evacuate to the control room and start data collection by opening the pressure acquisition software and the acquisition instrument on the computer terminal in advance;

[0019] After ensuring that the preset normal conditions are met, the ignition button on the ignition control device is pressed, the engine starts running, and the nozzle inner wall pressure data is collected;

[0020] After the test, shut down the data acquisition system and disconnect the ignition power supply. After confirming safety, enter the test site to dismantle the test equipment and prepare for the next test.

[0021] Beneficial effects:

[0022] 1. The supersonic separation line nozzle disclosed in the present invention, which can measure the inner wall pressure distribution at multiple swing angles, adopts a modular design and is composed of a fixed section assembly, a separation section assembly, and a nozzle connection sealing device. To achieve different nozzle swing angles, it is only necessary to replace the separation section assembly, while the fixed section assembly and the nozzle connection sealing device can be reused, reducing the processing cost of parts and improving their utilization.

[0023] 2. The supersonic separation line nozzle disclosed in this invention, capable of measuring inner wall pressure distribution at multiple swing angles, has an annular positioning band machined on the left end face of the separation section housing, and a corresponding annular positioning groove, with an O-ring positioned within, on the right end face of the fixed section housing. During installation, inserting the annular positioning band of the separation section housing into the annular positioning groove of the fixed section housing not only positions the separation section assembly for installation but also achieves excellent sealing performance by compressing the O-ring, ensuring airtightness at the nozzle connection when operating under high pressure.

[0024] 3. The supersonic separation line nozzle disclosed in the present invention can measure the inner wall pressure distribution under multiple swing angles. The V-grooves on the two clamps circumferentially clamp the conical structure at the contact end faces of the separation section assembly and the fixed section assembly, and then use two sets of hexagonal head bolts to fasten the two clamps. The clamps squeeze the conical structure to apply an axial pre-tightening force to the connection of the components, thereby compressing the O-ring and causing it to deform, further ensuring the sealing of the nozzle connection.

[0025] 4. The supersonic separation line nozzle disclosed in the present invention can measure the inner wall pressure distribution at multiple swing angles. By arranging more measuring points, as much test data as possible can be obtained in one test, which significantly improves the efficiency of each test and the amount of experimental data obtained.

[0026] 5. The supersonic separation line nozzle disclosed in the present invention can measure the inner wall pressure distribution at multiple swing angles. An insulating sleeve is installed inside the metal shell. The inner wall surface of the insulating sleeve not only constitutes the nozzle profile, but also provides thermal protection for the metal shell, thereby improving the high temperature resistance of the nozzle under hot test conditions.

[0027] 6. The supersonic separation line nozzle disclosed in the present invention can measure the inner wall pressure distribution under multiple swing angles. The right end of the rear fixed section insulation sleeve is processed into a male spherical surface, and the left end of the separation section shell and the separation section insulation sleeve is processed into a corresponding female spherical surface. The assembled separation section assembly must ensure the continuity of the female spherical surface. A certain gap will be left when the male and female spherical surfaces are matched to ensure the internal flow field structure of the ball-and-socket type supersonic separation line nozzle during actual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure breakdown of the supersonic separation line nozzle when it is placed vertically at an angle of 45°.

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of the front view of the supersonic separation line nozzle when it is placed horizontally and upright.

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of the front view when the separation section shell is placed horizontally.

[0031] Figure 4 2 is a test principle diagram of a supersonic separation line nozzle in a specific implementation manner.

[0032] Among them, 1-front fixed section insulation sleeve, 2-rear fixed section insulation sleeve, 3-fixed section shell, 4-pressure pipe seat, 5-pressure pipe seat joint, 6-clamp, 7-ferrule straight-through joint, 8-pressure measuring tube, 9-separation section welding flange, 10-separation section insulation sleeve, 11-separation section insulation sleeve retaining ring, 12-separation section shell, 13-fixed section pressure measuring hole, 14-O-ring, 15-separation section pressure measuring hole, 16-combustion chamber shell, 17-propellant charge, 18-pressure sensor, 19-pressure signal transmission line, 20-pressure pipe, 21-collector, 22-sixteen-channel pressure scanning valve, 23-network cable, 24-computer terminal, 25-ignition control equipment, 26-ignition signal transmission line, 27-test bench, 28-supersonic separation line nozzle. DETAILED DESCRIPTION

[0033] In order to better illustrate the purpose and advantages of the present invention, the present invention is further described below with reference to the drawings and specific embodiments.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, the supersonic separation line nozzle disclosed in this embodiment is used to measure the inner wall pressure distribution under multiple fixed swing angles. The nozzle body consists of three parts: a fixed section assembly, a separation section assembly and a nozzle connection sealing device.

[0036] The fixed section assembly and the separation section assembly are sealed and connected through a nozzle connection sealing device; different nozzle swing angles are achieved by replacing different separation section assemblies; the left end face of the separation section shell 12 is a frustum structure, and its axis forms a certain angle with the axis of the main structure of the separation section shell 12. After the separation section assembly and the fixed section assembly are installed through an annular positioning belt and annular positioning groove coaxial with the frustum structure, the axis of the fixed section assembly and the axis of the separation section assembly will form this angle. If different swing angles are to be achieved, it is only necessary to process different separation section assemblies and assemble them with the fixed section assembly to meet the test requirements.

[0037] The fixed section assembly consists of a front fixed section insulation sleeve 1, a rear fixed section insulation sleeve 2, a fixed section shell 3, a pressure pipe seat 4 and a pressure pipe seat joint 5.

[0038] Each pressure-inducing pipe seat 4 is made of a stainless steel pipe of appropriate length, with a 37-degree nut over a nut cap, and then a 37-degree welded hydraulic spherical joint and a sensor base welded at each end. Each pressure-inducing pipe seat joint 5 is made of a shorter stainless steel pipe, one end of which is welded to the fixed-section pressure measuring hole 13 provided in the fixed-section housing 3, and the other end is welded to a 37-degree welded pipe nozzle. The pressure-inducing pipe seat 4 and the pressure-inducing pipe joint 5 are sealed and connected by a set of standard pipe connectors including an over-the-shoulder nut, a spherical joint, and a pipe nozzle, which facilitates disassembly and maintenance. At the same time, it can also lead out the gas to reduce the temperature, preventing the pressure sensor from being burned by direct contact with the high-temperature gas.

[0039] The separation section assembly includes a ferrule straight-through connector 7, a pressure measuring tube 8, a separation section welding flange 9, a separation section insulation sleeve 10, a separation section insulation sleeve retaining ring 11, and a separation section shell 12. The pressure measuring tube 8, the separation section welding flange 9, and the separation section shell 12 are all welded at the connection to ensure connection strength and sealing. The separation section insulation sleeve retaining ring 11 is used in conjunction with the separation section welding flange 9. The two are connected and fastened by eight sets of bolts, which can fix and limit the separation section insulation sleeve 10 installed in the separation section shell 12. A through hole larger than the nozzle outlet is opened in the center of the separation section insulation sleeve retaining ring 11, which does not affect the gas flow at the nozzle outlet.

[0040] Holes are drilled on the front fixed section insulation sleeve 1, the rear fixed section insulation sleeve 2, the fixed section shell 3, the separation section insulation sleeve 10 and the separation section shell 12 to draw out gas to facilitate pressure measurement on the inner wall of the nozzle during the test.

[0041] Among them, the fixed section assembly is arranged with three fixed section pressure measuring holes 13, one is located at the nozzle inlet, and the other two are symmetrically distributed near the throat of the initial expansion section of the nozzle; considering that the flow field in the separation section of the supersonic separation line nozzle has a plane symmetry, three rows of thirteen separation section pressure measuring holes 15 are arranged in the upper, lower and right sides of the separation section assembly. Since the space on the upper side of the separation section assembly is larger, an additional pressure measuring hole is arranged near the nozzle separation line without affecting the subsequent nozzle assembly. The distance between each other in each row of the remaining pressure measuring holes is 12 mm. The arrangement of more measuring points can obtain as much test data as possible in one test, fully improving the research value of each test.

[0042] Each insulation sleeve and the metal shell are fitted with a clearance fit. During installation, sealant needs to be applied to the outer surface of the insulation sleeve to prevent gas leakage between the insulation sleeve and the inner wall of the metal shell. In addition, it is necessary to ensure that the pressure measuring holes on the insulation sleeve are aligned one by one with the pressure measuring holes on the metal shell.

[0043] Each insulation sleeve serves two purposes: first, to provide thermal protection for the metal shell during testing, and second, to form the basic profile of the nozzle. Both the front fixed section insulation sleeve 1 and the separation section insulation sleeve 10 are made of high-silicon oxide materials. As for the rear fixed section insulation sleeve 2, since it forms the nozzle throat structure and faces the most severe ablation issues, it is made of a carbon-carbon material with better high-temperature and ablation resistance. The insulation sleeves need to be replaced after each test.

[0044] Main metal parts such as the fixed section shell 3, the separation section welding flange 9, the separation section insulation sleeve buckle 11 and the separation section shell 12 are all made of 304 stainless steel.

[0045] The nozzle connection sealing device includes a clamp 6 and an O-ring 14. During installation, first place the O-ring 14 in the annular positioning groove of the fixed section assembly, and then insert the annular positioning belt on the left end face of the separation section assembly into the positioning groove; when the two contact end faces of the fixed section assembly and the separation section assembly are aligned and properly pressed, the V-grooves on the two clamps 6 are used to circumferentially clamp the conical structure at the contact end faces of the assembly, and then use two sets of hexagonal head bolts to tighten the two clamps 6. The clamps squeeze the conical structure to apply an axial pre-tightening force to the connection of the assembly, thereby compressing the O-ring 14 and causing it to deform, further ensuring the sealing of the nozzle.

[0046] The right end of the rear fixed section insulation sleeve 2 is processed into a male spherical surface, and the left end of the separation section shell 12 and the separation section insulation sleeve 10 is processed into a corresponding female spherical surface. The assembled separation section assembly must ensure the continuity of the female spherical surface. A certain gap will be left when the male and female spherical surfaces are matched. Its function is to ensure the internal flow field structure of the ball-and-socket type supersonic separation line nozzle during actual operation.

[0047] like Figure 3 As shown, the axis of the conical structure on the left end face of the separation segment shell 12 forms a certain angle with the axis of the main structure of the separation segment shell. When the separation segment assembly and the fixed segment assembly are installed through the annular positioning belt and the annular positioning groove coaxial with the conical structure, the axis of the fixed segment assembly and the axis of the separation segment assembly will form this angle. If different swing angles, such as 3°, 5°, 7°, etc., are to be achieved, only different separation segment assemblies need to be processed.

[0048] like Figure 4 The figure shows a schematic diagram of the hot test of a supersonic separation line nozzle. In addition to the supersonic separation line nozzle 28, the associated test equipment also includes a combustion chamber assembly, a pressure acquisition system, and an ignition control system. The combustion chamber assembly includes a combustion chamber housing 16 and a propellant grain 17. The pressure acquisition system includes a pressure sensor 18, a pressure signal transmission line 19, a pressure lead pipe 20, a data acquisition instrument 21, a sixteen-channel pressure scanning valve 22, a network cable 23, and a computer terminal 24. The ignition control system includes an ignition control device 25 and an ignition signal transmission line 26.

[0049] This embodiment discloses a supersonic separation line nozzle for measuring the inner wall pressure distribution at multiple swing angles. The specific test method is implemented as follows:

[0050] Step 1: Select the separation section assembly with the corresponding angle according to the test purpose, assemble the fixed section assembly and the separation section assembly into a supersonic separation line nozzle according to the assembly sequence, install the nozzle to the outlet of the combustion chamber device through threaded connection to form a complete engine, and then fix the entire engine on the test bench;

[0051] Step 2: Thread the calibrated pressure sensor onto the corresponding sensor base of the engine. The two are sealed at the end faces with a copper gasket. The pressure signal transmission line from the pressure sensor is connected to the collector. The sixteen-channel pressure scanning valve and the ferrule straight-through connector on the nozzle are flexibly connected with a pressure lead pipe. The collected pressure data is transmitted to the computer terminal via a network cable.

[0052] Step 3: After checking that all acquisition devices are connected correctly, connect the ignition signal transmission line between the fire control device and the combustion chamber device;

[0053] Step 4: All personnel evacuate to the control room, open the pressure acquisition software and acquisition instrument on the computer terminal in advance, set the acquisition instrument's sampling frequency to 20kHz, start data acquisition, and press the ignition button on the ignition control device after ensuring that everything is normal;

[0054] Step 5: After the test, stop data acquisition and save the test results, then disconnect the ignition power supply.

[0055] Step 6: After confirming safety, enter the test site to disassemble the test device: first disconnect the ignition signal transmission line and the pressure signal transmission line, and the pressure sensor must be removed from the nozzle assembly and recalibrated; the combustion chamber device must also be disassembled and cleaned to remove the residue produced by the combustion of the internal propellant; the nozzle assembly must also be cleaned and maintained, the insulation sleeve must be replaced with a new insulation sleeve, and the separation section assembly must be replaced with another swing angle form as required by claim 1. After that, the test device is assembled according to the previous assembly sequence, and then the supersonic separation line nozzle hot test test can be carried out at another swing angle, so as to realize the measurement of the inner wall pressure of the hot test supersonic separation line nozzle at different swing angles.

[0056] The above specific description further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A supersonic separation line nozzle for measuring inner wall pressure distribution at multiple fixed swing angles, characterized by: The invention comprises a fixed section assembly, a separation section assembly and a nozzle connection sealing device; the fixed section assembly and the separation section assembly are sealed and connected via the nozzle connection sealing device; different separation section assemblies are replaced to achieve different nozzle swing angles; the left end face of the separation section shell (12) is a truncated cone structure, the axis of which forms a certain angle with the axis of the main structure of the separation section shell (12); after the separation section assembly and the fixed section assembly are installed through an annular positioning belt and an annular positioning groove coaxial with the truncated cone structure, the axis of the fixed section assembly and the axis of the separation section assembly will form a required swing angle; if different swing angles are to be achieved, only different separation section assemblies need to be processed, and the separation section assembly and the fixed section assembly can be assembled to meet the test requirements.

2. The supersonic separation line nozzle according to claim 1, characterized in that: The fixed section assembly comprises a front fixed section thermal insulation sleeve (1), a rear fixed section thermal insulation sleeve (2), a fixed section housing (3), a pressure-inducing pipe seat (4), and a pressure-inducing pipe seat joint (5); The left end of the fixed section shell (3) is installed at the outlet of the combustion chamber device through a threaded connection, and a step is machined inside the shell to limit the insulation sleeve; the front fixed section insulation sleeve (1) and the rear fixed section insulation sleeve (2) are clearance-matched with the fixed section shell (3), and sealant needs to be applied to the gap during assembly; the insulation sleeve has the following functions: first, to provide thermal protection for the metal shell; second, to form the nozzle convergence section, throat and part of the initial expansion section profile; a number of fixed section pressure measuring holes (13) are provided at the nozzle inlet and downstream of the nozzle throat of the fixed section shell (3); a pressure pipe seat joint (5) is welded on each fixed section pressure measuring hole (13), and the pressure pipe seat joint (5) and the pressure pipe seat (4) are sealed by a set of standard pipe connectors; each pressure pipe seat (4) is installed with a pressure collection device, which is used to draw out the gas to reduce the temperature and prevent the pressure sensor from being directly exposed to the high-temperature gas and being burned.

3. The supersonic separation line nozzle according to claim 1, characterized in that: The separation section assembly comprises a ferrule straight-through connector (7), a pressure measuring tube (8), a separation section welding flange (9), a separation section heat insulating sleeve (10), a separation section heat insulating sleeve buckle (11) and a separation section shell (12); the separation section heat insulating sleeve (10) is inserted into the tail of the separation section shell (12) for installation, and its first function is to provide heat protection for the separation section shell (12) and second function is to form the main profile of the nozzle expansion section; the separation section welding flange (9) is fixed to the tail of the separation section shell (12) by welding, and its function is to be in contact with the separation section. The heat-insulating sleeve buckle (11) is connected by eight groups of bolts to achieve fixed limit of the separation section heat-insulating sleeve (10); a plurality of separation section pressure measuring holes (15) are provided on the separation section shell, and a pressure measuring tube (8) is welded to each separation section pressure measuring hole (15); a ferrule straight-through joint (7) is installed on the top of the pressure measuring tube (8), and the other end of the pressure-leading tube (20) connected to the ferrule straight-through joint (7) is connected to the sixteen-channel pressure scanning valve (22), thereby achieving integrated measurement of the nozzle inner wall pressure and preventing the scanning valve from being burned due to excessive gas temperature.

4. The supersonic separation line nozzle according to claim 1, characterized in that: The nozzle connection sealing device comprises a clamp (6) and an O-ring (14); during installation, the annular positioning belt on the left end face of the separation section assembly is inserted into the annular positioning groove of the fixed section assembly, the annular positioning groove not only plays a positioning role for the installation of the separation section assembly, but also achieves good sealing performance by pressing the O-ring (14), thereby ensuring the airtightness of the nozzle connection during the hot run test; the clamp (6) is processed with a V-groove, when the two end faces of the fixed section assembly and the separation section assembly are aligned, the V-grooves on the two clamps (6) circumferentially clamp the truncated cone structure at the contact end face of the assembly, and then two sets of bolts are used to tighten the two clamps (6), and the clamp (6) squeezes the truncated cone structure to apply an axial pre-tightening force to the connection of the assembly, thereby compressing the O-ring (14) to deform it and further ensure the sealing of the nozzle.

5. The supersonic separation line nozzle according to claim 2 or 3, characterized in that: The right end of the rear fixed section thermal insulation sleeve (2) is processed into a male spherical surface, and the left end of the separation section shell (12) and the separation section thermal insulation sleeve (10) are processed into a female spherical surface corresponding thereto, and the assembled separation section assembly must ensure the continuity of the female spherical surface. A certain gap will be left when the male and female spherical surfaces are matched, and its function is to ensure the internal flow field structure of the ball-and-socket type supersonic separation line nozzle when it is actually working.

6. The supersonic separation line nozzle according to claim 2, characterized in that: There are three fixed section pressure measuring holes (13), one is located at the nozzle inlet, and the other two are symmetrically distributed at the initial expansion section of the nozzle near the throat.

7. The supersonic separation line nozzle according to claim 3, characterized in that: The separation section pressure measuring holes (15) are arranged in the upper side, lower side and right side of the separation section assembly, with a total of thirteen pressure measuring holes in three rows. One more pressure measuring hole is arranged near the nozzle separation line without affecting the subsequent nozzle assembly.

8. A test system is constructed using the supersonic separation line nozzle according to claims 1 to 7, characterized in that: The test system also includes a combustion chamber device, a pressure acquisition system and an ignition control system; the combustion chamber device includes a combustion chamber shell (16) and a propellant grain (17), and the grain burns in the combustion chamber to generate a large amount of gas and heat, providing working fluid and energy for the engine operation process; the pressure acquisition system includes a pressure sensor (18), a pressure signal transmission line (19), a pressure lead pipe (20), a collection instrument (21), a sixteen-channel pressure scanning valve (22), a network cable (23) and a computer terminal (24), and its function is to collect the pressure signal of the inner wall of the nozzle during the test and generate a pressure curve; the ignition control system includes an ignition control device (25) and an ignition signal transmission line (26), and its function is to realize remote control of engine ignition; The supersonic separation line nozzle (28) is installed to the outlet of the combustion chamber device through threaded connection to form a complete engine, and then the engine is fixed on the test bench (27); then the calibrated pressure sensor (18) is installed on the corresponding sensor base of the engine, and the pressure signal transmission line (19) led out of the pressure sensor (18) is connected to the collector (21); the sixteen-channel pressure scanning valve (22) and the ferrule straight-through connector (7) on the nozzle are flexibly connected by a pressure lead pipe (20), and the collected pressure data is transmitted to the computer terminal (24) by a network cable (23); finally, the ignition signal transmission line (26) between the ignition control device (25) and the combustion chamber device is connected.

9. A method for testing using the test system according to claim 8, characterized in that: After the test system is built; All personnel evacuate to the control room and start data collection by opening the pressure acquisition software and the acquisition instrument on the computer terminal in advance; After ensuring that the preset normal conditions are met, the ignition button on the ignition control device is pressed, the engine starts running, and the nozzle inner wall pressure data is collected; After the test, shut down the data acquisition system and disconnect the ignition power supply. After confirming safety, enter the test site to dismantle the test equipment and prepare for the next test.

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