Solid engine spray plug opening pressure test device and test method

Abstract

The invention relates to the technical field of solid engine testing, and particularly discloses a solid engine spray plug opening pressure testing device and a testing method.The solid engine spray plug opening pressure testing device comprises a high-pressure cylinder, the two ends of the high-pressure cylinder are connected with a spray plug seat and a base respectively, an ignition system is arranged on the outer side of the base, an ignition through hole is formed in the base, and an ignition charge bag is arranged on the inner wall of the base; a lead of the ignition charge bag can penetrate through the ignition through hole and is connected with the ignition system, a pressure measuring hole is formed in the high-pressure cylinder, a testing system is arranged on the outer side of the high-pressure cylinder, a pressure sensor is arranged on the high-pressure cylinder, the pressure sensor is connected with the pressure measuring hole and is connected with the testing system, and a spray blocking plate is bonded to the inner wall of the spray blocking base. The end, close to the high-pressure cylinder, of the spray blocking plate is provided with a spray blocking cover, and the base, the ignition charge bag, the high-pressure cylinder, the spray blocking cover, the spray blocking plate and the spray blocking base are coaxially arranged. The engine starting instantaneity can be truly simulated, the cost can be effectively saved, the operation practicability is good, and the testing efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of solid engine testing, and in particular provides a solid engine jet plugging and opening pressure testing device and a testing method. Background Art

[0002] The nozzle plug is an important part of the solid rocket engine. Its design and structural optimization are crucial to the performance and reliability of the engine. The nozzle plug is usually installed at the throat lining of the nozzle. On the one hand, it plays the role of building pressure at the initial stage of engine ignition to ensure the normal start of the engine. On the other hand, it plays the role of sealing and moisture-proofing to prevent the propellant from getting damp. It can also quickly vaporize or break under high temperature and high pressure environment to avoid damage to the nozzle and subsequent structures.

[0003] The nozzle plugging pressure test is an important step in engine design. It can quickly establish the engine ignition pressure, shorten the ignition delay period, and improve the ignition reliability. If the nozzle plugging design pressure bearing capacity is too low, it will cause the ignition delay period to increase and the ignition charge energy loss to increase. In severe cases, the engine will stall. If the nozzle plugging design pressure bearing capacity is too high, it will extend the ignition time, cause the ignition pressure peak to be too high, the propellant surface may be damaged, and the combustion chamber shell pressure will be too high. In severe cases, it will cause the shell to explode.

[0004] Therefore, a suitable nozzle plug opening pressure can reduce ignition disturbance and avoid instantaneous thrust deviation caused by uneven flow field during ignition. The nozzle plug cold opening pressure test is an important link in the delivery of nozzle plug products. It is necessary to design a special experimental device to use high-pressure gas to generate pressure for testing. Although the test method in the prior art can simulate the opening pressure, it has the following problems: 1) Due to the long pressurization time, it is impossible to truly simulate the instantaneous nature of engine opening; 2) The structure is complex and the test efficiency is low. In order to solve the above problems, it is necessary to design a solid engine nozzle plug opening pressure test device and test method. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a solid motor jet plugging opening pressure test device and a test method, which can be used for solid motor jet plugging opening pressure measurement.

[0006] The present invention provides a solid engine jet plugging opening pressure test device, comprising a high-pressure cylinder, wherein two ends of the high-pressure cylinder are respectively connected to a jet plugging seat and a base, and an ignition system is arranged on the outer side of the base; an ignition through hole is arranged on the base, an ignition powder bag is arranged on the inner wall of the base, and the lead of the ignition powder bag can pass through the ignition through hole and be connected to the ignition system; a pressure measuring hole is arranged on the high-pressure cylinder, a test system is arranged on the outer side of the high-pressure cylinder, a pressure sensor is arranged on the high-pressure cylinder, and the pressure sensor is connected to the pressure measuring hole and the test system; a jet plugging plate is bonded to the inner wall of the jet plugging seat, and a jet plugging cover is arranged on the end of the jet plugging plate close to the high-pressure cylinder.

[0007] Furthermore, a connecting side wall is provided on the circumferential end surface of the bottom wall of the base and extends toward the high-pressure cylinder, and the bottom wall is connected to the high-pressure cylinder via the connecting side wall; a plurality of planar structure installation sections are evenly arranged on the outer end surface of the connecting side wall.

[0008] Furthermore, the nozzle plugging seat includes a conical outer wall whose inner diameter gradually increases from one side of the high-pressure cylinder toward the side away from the high-pressure cylinder, and the nozzle plugging plate is a conical plate matched with the conical outer wall; the nozzle plugging cover includes a conical outer cover and an arc-shaped inner cover matched with the nozzle plugging plate, and the arc top of the arc-shaped inner cover is arranged toward the side away from the high-pressure cylinder.

[0009] Furthermore, the nozzle plugging seat comprises a cylindrical outer wall, the cylindrical outer wall is connected to one end of the conical outer wall close to the high-pressure cylinder, and the nozzle plugging seat is connected to the high-pressure cylinder through the cylindrical outer wall.

[0010] Furthermore, the nozzle plugging plate is formed by laminating at least two non-metallic plate composite films, and the end of the nozzle plugging plate close to the high-pressure cylinder extends to the inner side of the cylindrical outer wall, that is, the length of the nozzle plugging plate is greater than the length of the conical outer wall.

[0011] Furthermore, the two ends of the high-pressure cylinder are respectively provided with an internal connecting boss and an external connecting boss, and both the internal connecting boss and the external connecting boss are provided with external threads; the connecting side wall and the cylindrical outer wall are both provided with internal threads, the connecting side wall is threadedly connected to the external connecting boss, and the cylindrical outer wall is threadedly connected to the internal connecting boss.

[0012] Furthermore, the base, the ignition charge, the high-pressure cylinder, the nozzle plugging cover, the nozzle plugging plate and the nozzle plugging seat are all coaxially arranged.

[0013] A solid rocket motor plugging opening pressure test method, using the above-mentioned pressure test device for testing, comprises the following steps: S1: Bonding the nozzle plugging plate to the conical outer wall of the nozzle plugging seat, and bonding the nozzle plugging cover to the nozzle plugging plate; S2: Fix the ignition charge on the base and pass the ignition fuse through the ignition through hole; S3: Fix and tighten the nozzle plugging seat to the high-pressure cylinder through the cylindrical outer wall; S4: Fix and tighten the base to the high-pressure cylinder by connecting the side wall; S5: Connect the pressure sensor to the high pressure cylinder; S6: Fix the pressure test device on the test bench and connect the ignition fuse to the ignition system.

[0014] Furthermore, in S5, the pressure sensor is connected to the high-pressure cylinder at the pressure measuring hole, and the pressure sensor signal is connected to the test system to measure the pressure data.

[0015] Furthermore, after the ignition fuse is connected to the ignition system and ignition is performed in S6, when the pressure of the high-pressure cylinder reaches a certain pressure, the nozzle plugging cover is opened. At this time, the test system records the pressure-time curve of the pressure sensor, determines the time when the nozzle plugging cover is opened through the voltage signal, and records the pressure of the pressure sensor at the opening time, which is the opening pressure of the nozzle plugging cover.

[0016] Compared with the prior art, the present invention can achieve the following beneficial effects: 1. The pressure test device in the present invention can simulate the ignition of a solid engine and test the actual opening pressure of the solid engine nozzle plug. The test device simulates the ignition of a solid engine, which is consistent with the actual operation of the solid engine. The pressure sensor can accurately test the actual pressure-time curve when the nozzle plug is opened, which is beneficial to analyzing the working process of the solid engine and providing data reference for product design. 2. Compared with the traditional test method, this device can truly simulate the instantaneous opening of the engine, and it is safe, reliable, intuitive, effectively saves costs, has good practicality in operation, and high test efficiency. This design concept can be analogized for the nozzle plugging opening pressure test of other different solid engines, and has strong versatility; 3. The pressure test device in the present invention uses an ignition charge to provide pressure and measures the opening pressure through a pressure sensor. It is an intelligent, efficient, accurate and intuitive detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the pressure test device provided by the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the pressure test device provided by the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 yes Figure 2 Sectional view in the AA direction; Figure 4 yes Figure 3 A partial enlarged view of point B in the middle; The accompanying drawings include: high-pressure cylinder 1, nozzle plugging seat 2, base 3, ignition through hole 4, ignition powder bag 5, external connecting boss 6, pressure sensor 7, nozzle plugging plate 8, nozzle plugging cover 9, connecting side wall 10, mounting section 11, conical outer wall 12, cylindrical outer wall 13, conical outer cover 14, arc-shaped inner cover 15, inner connecting boss 16. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following Figure 1-4It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0019] A solid engine jet plugging and opening pressure test device comprises a high-pressure cylinder 1, and two ends of the high-pressure cylinder 1 are respectively connected to Figure 1 The nozzle plug seat 2 and the base 3 shown in the figure, the base 3 is provided with an ignition system on the outside, and the base 3 is provided with a Figure 3 An ignition through hole 4 is shown in the figure, an ignition powder bag 5 is provided on the inner wall of the base 3, the fuse of the ignition powder bag 5 can pass through the ignition through hole 4 and be connected to the ignition system, a spray plugging plate 8 is bonded to the inner wall of the spray plugging seat 2, and a spray plugging cover 9 is provided at one end of the spray plugging plate 8 close to the high-pressure cylinder 1. When the ignition fuse is connected to the ignition system and ignition is performed, the pressure of the high-pressure cylinder 1 increases. When a certain pressure is reached, the spray plugging cover 9 will be flushed open.

[0020] The nozzle plug seat 2 includes a conical outer wall 12 whose inner diameter gradually increases from one side of the high-pressure cylinder 1 toward the side away from the high-pressure cylinder 1. In order to be close to the actual working condition of the engine, the nozzle plug seat 2 is matched with the rear section of the engine nozzle. The nozzle plug plate 8 is a conical plate matched with the conical outer wall 12. The nozzle plug plate 8 is formed by pressing at least two non-metallic plate composite films. The nozzle plug cover 9 includes a conical outer cover 14 and an arc-shaped inner cover 15 matched with the nozzle plug plate 8. The arc top of the arc-shaped inner cover 15 is set toward the side away from the high-pressure cylinder 1.

[0021] The injection plugging seat 2 includes a cylindrical outer wall 13, which is connected to one end of the conical outer wall 12 close to the high-pressure cylinder 1. The injection plugging seat 2 is connected to the high-pressure cylinder 1 through the cylindrical outer wall 13. A connecting side wall 10 is extended toward the high-pressure cylinder 1 on the circumferential end surface of the bottom wall of the base 3, and the bottom wall is connected to the high-pressure cylinder 1 through the connecting side wall 10. The end of the injection plugging plate 8 close to the high-pressure cylinder 1 extends to the inner side of the cylindrical outer wall 13, that is, the length of the injection plugging plate 8 is greater than the length of the conical outer wall 12, which can truly simulate the instantaneousness of the engine opening.

[0022] The two ends of the high-pressure cylinder 1 are respectively provided with an internal connecting boss 16 and an external connecting boss 6, and the internal connecting boss 16 and the external connecting boss 6 are both provided with external threads. The connecting side wall 10 and the cylindrical outer wall 13 are both provided with internal threads. The connecting side wall 10 is threadedly connected to the external connecting boss 6, and the cylindrical outer wall 13 is threadedly connected to the internal connecting boss 16. A plurality of planar structure mounting sections 11 are evenly arranged on the outer end surface of the connecting side wall 10 to facilitate the connection between the base 3 and the high-pressure cylinder 1.

[0023] A pressure measuring hole is provided on the high-pressure cylinder 1, and a testing system is provided on the outside of the high-pressure cylinder 1. The testing system can measure pressure data. A pressure sensor 7 is provided on the high-pressure cylinder 1, and the pressure sensor 7 is connected to the pressure measuring hole. The pressure sensor 7 is connected to the testing system. The base 3, the ignition charge 5, the high-pressure cylinder 1, the nozzle plugging cover 9, the nozzle plugging plate 8 and the nozzle plugging seat 2 are all coaxially arranged to ensure the accuracy and stability of the test.

[0024] A solid rocket motor plugging opening pressure test method, using the above-mentioned pressure test device for testing, comprises the following steps: S1: bonding the nozzle plugging plate 8 to the conical outer wall 12 of the nozzle plugging seat 2, and bonding the nozzle plugging cover 9 to the nozzle plugging plate 8; S2: Fix the ignition charge 5 on the base 3 and pass the ignition fuse through the ignition through hole 4; S3: Fix and tighten the nozzle plugging seat 2 to the high-pressure cylinder 1 through the cylindrical outer wall 13; S4: Fix and tighten the base 3 to the high-pressure cylinder 1 by connecting the side wall 10; S5: Connect the pressure sensor 7 to the high-pressure cylinder 1, specifically connect the pressure sensor 7 to the high-pressure cylinder 1 at the pressure measuring hole, and connect the signal of the pressure sensor 7 to the test system to measure the pressure data; S6: Fix the pressure test device on the experimental table, connect the ignition fuse to the ignition system, connect the ignition fuse to the ignition system and ignite, when the pressure of the high-pressure cylinder 1 reaches a certain pressure, the spray plugging cover 9 is opened, and the test system records the pressure-time curve of the pressure sensor 7 at this time, determines the opening time of the spray plugging cover 9 through the voltage signal, and records the pressure of the pressure sensor 7 at the opening time, which is the opening pressure of the spray plugging cover 9.

[0025] The pressure sensor 7 records the gas pressure inside the high-pressure cylinder 1, and the voltage signal is the output signal of the pressure sensor 7, which can be recorded by the pressure sensor 7 itself or output by the pressure sensor 7 to other devices for recording, for example, it can be input into a laptop computer for recording; the voltage signal is recorded in order to obtain the gas pressure inside the high-pressure cylinder 1, and the recorded voltage signal is for a period of time, mainly including before the experiment → the pressure inside the high-pressure cylinder 1 is consistent with the atmospheric pressure → the ignition package 5 is ignited by the ignition system → the ignition package 5 burns to produce a large amount of gas → the pressure inside the high-pressure cylinder 1 continues to rise → the spray plugging cover 9 opens after reaching the pressure bearing capacity limit → the gas in the high-pressure cylinder 1 is released through the opened channel → the pressure inside the high-pressure cylinder 1 continues to decrease → the pressure inside the high-pressure cylinder 1 returns to the atmospheric pressure.

[0026] Before the spray plugging cover 9 is opened, the pressure inside the high-pressure cylinder 1 continues to rise due to the large amount of gas generated by the combustion of the ignition powder bag 5. After the spray plugging cover 9 is opened, the gas accumulated inside the high-pressure cylinder 1 is driven by the pressure difference and diffuses to the surroundings through the channel generated after the spray plugging cover 9 is opened, causing the pressure inside the high-pressure cylinder 1 to drop. Therefore, the pressure-time curve recorded by the pressure sensor 7 can be used to obtain the pressure when the spray plugging cover 9 is opened.

[0027] The pressure sensor 7 outputs a signal in the form of voltage. The change in voltage corresponds to the change in pressure detected by the pressure sensor 7. By recording the output voltage-time curve and the output voltage-pressure correspondence inherent in the pressure sensor 7, the pressure-time curve inside the high-pressure cylinder 1 can be obtained. By interpreting the pressure-time curve, the opening time of the spray plugging cover 9 and how the pressure experienced by the spray plugging cover 9 changes during the opening process can be obtained.

[0028] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A solid engine jet plugging opening pressure test device, characterized in that: It includes a high-pressure cylinder, with a nozzle plugging seat and a base connected to both ends of the high-pressure cylinder respectively, and an ignition system is arranged on the outside of the base; an ignition through hole is arranged on the base, an ignition powder bag is arranged on the inner wall of the base, and the lead of the ignition powder bag can pass through the ignition through hole and be connected to the ignition system; a pressure measuring hole is arranged on the high-pressure cylinder, a test system is arranged on the outside of the high-pressure cylinder, a pressure sensor is arranged on the high-pressure cylinder, and the pressure sensor is connected to the pressure measuring hole and the test system; a nozzle plugging plate is bonded to the inner wall of the nozzle plugging seat, and a nozzle plugging cover is arranged on the end of the nozzle plugging plate close to the high-pressure cylinder.

2. The solid rocket engine blockage opening pressure test device according to claim 1, characterized in that: A connecting side wall is provided on the circumferential end surface of the bottom wall of the base, extending toward the high-pressure cylinder, and the bottom wall is connected to the high-pressure cylinder via the connecting side wall; a plurality of installation sections with planar structures are evenly arranged on the outer end surface of the connecting side wall.

3. The solid rocket engine blockage opening pressure test device according to claim 2, characterized in that: The nozzle plugging seat includes a conical outer wall whose inner diameter gradually increases from one side of the high-pressure cylinder toward the side away from the high-pressure cylinder, and the nozzle plugging plate is a conical plate matched with the conical outer wall; the nozzle plugging cover includes a conical outer cover and an arc-shaped inner cover matched with the nozzle plugging plate, and the arc top of the arc-shaped inner cover is arranged toward the side away from the high-pressure cylinder.

4. The solid rocket engine blockage opening pressure test device according to claim 3, characterized in that: The nozzle plugging seat comprises a cylindrical outer wall, the cylindrical outer wall is connected to one end of the conical outer wall close to the high-pressure cylinder, and the nozzle plugging seat is connected to the high-pressure cylinder through the cylindrical outer wall.

5. The solid rocket engine blockage opening pressure test device according to claim 4, characterized in that: The nozzle plugging plate is formed by laminating at least two non-metallic plate composite films, and the end of the nozzle plugging plate close to the high-pressure cylinder extends to the inner side of the cylindrical outer wall, that is, the length of the nozzle plugging plate is greater than the length of the conical outer wall.

6. The solid rocket engine blockage opening pressure test device according to claim 5, characterized in that: The two ends of the high-pressure cylinder are respectively provided with an inner connecting boss and an outer connecting boss, and both the inner connecting boss and the outer connecting boss are provided with external threads; the connecting side wall and the cylindrical outer wall are both provided with internal threads, the connecting side wall is threadedly connected to the external connecting boss, and the cylindrical outer wall is threadedly connected to the inner connecting boss.

7. The solid rocket engine blockage opening pressure test device according to claim 6, characterized in that: The base, ignition powder bag, high-pressure cylinder, nozzle plugging cover, nozzle plugging plate and nozzle plugging seat are all coaxially arranged.

8. A solid rocket engine blockage opening pressure test method, using the pressure test device of claim 6 for testing, characterized in that: The steps include: S1: Bonding the nozzle plugging plate to the conical outer wall of the nozzle plugging seat, and bonding the nozzle plugging cover to the nozzle plugging plate; S2: Fix the ignition charge on the base and pass the ignition fuse through the ignition through hole; S3: Fix and tighten the nozzle plugging seat to the high-pressure cylinder through the cylindrical outer wall; S4: Fix and tighten the base to the high-pressure cylinder by connecting the side wall; S5: Connect the pressure sensor to the high pressure cylinder; S6: Fix the pressure test device on the test bench and connect the ignition fuse to the ignition system.

9. The solid rocket motor plugging and opening pressure testing method according to claim 8, characterized in that: In S5, the pressure sensor is connected to the high-pressure cylinder at the pressure measuring hole, and the pressure sensor signal is connected to the test system to measure the pressure data.

10. The solid rocket motor plugging and opening pressure testing method according to claim 9, characterized in that: After the ignition fuse is connected to the ignition system and ignition is performed in S6, when the pressure of the high-pressure cylinder reaches a certain pressure, the nozzle plugging cover is opened. At this time, the test system records the pressure-time curve of the pressure sensor, determines the opening time of the nozzle plugging cover through the voltage signal, and records the pressure sensor pressure at the opening time, which is the opening pressure of the nozzle plugging cover.

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