A gas shock test system and pressure curve control method

Abstract

The present invention belongs to the technical field of solid rocket engine testing, and particularly relates to a gas shock test system and a pressure curve control method. A gas shock test system comprises a high-pressure accumulator, a bursting disc I, a bursting disc II, a simulation test cabin and a control system connected in sequence; the bursting disc II is provided with a bursting fragment target sensor, the simulation test cabin is provided with a pressure measuring seat, a plurality of normally open exhaust holes and a plurality of exhaust flanges, the exhaust flange is provided with a flange plug cover, the flange plug cover seals the exhaust flange end through a plug cover opening controller, and the plug cover opening controller and the bursting fragment target sensor are remotely controlled through the control system. The present invention uses a method for obtaining a diaphragm rupture signal to control the exhaust area of ​​the simulation test cabin to increase the falling rate of the pressure shock curve and improve the simulation accuracy of the pressure shock curve.

Description

Technical Field

[0001] The invention belongs to the technical field of solid rocket engine testing, and in particular relates to a gas impact test system and a pressure curve control method. Background Art

[0002] The use of missile tailless launch technology can remove the protective cover during missile launch, reduce the timing control risk during launch, and reduce the impact of the protective cover on the launch platform after it is thrown out. However, when launching without a tail, the gas shock load will produce a large impact load on the missile nozzle, the rear head of the solid rocket engine, and the shell, which has new requirements for the design of the nozzle protection system and the engine shell. In order to verify the applicability of the tailless launch technology and the structural and functional integrity of the nozzle protection system and the engine shell under the gas shock load, it is necessary to use a gas shock load test system on the ground to simulate the cold ejection process of the solid rocket engine.

[0003] The current test system uses a double bursting disc combination to form a quick-opening valve to quickly transport the high-pressure air in the high-pressure accumulator to the simulated launch tube, and uses the characteristics of fast air intake and slow exhaust to form a pressure shock load in the simulated launch tube. The double bursting disc combination control adopts remote control. During the test, a certain pressure is charged to the pipeline between the bursting discs, so that when the high-pressure accumulator is at the target pressure, the bursting discs are all within the safe pressure range. During the test, the bursting disc pipeline exhaust valve is used to release the pressure, so that after bursting disc 1 explodes, bursting disc 2 will explode accordingly, and the pipeline passage will open. A pneumatic main valve (ball valve) and a balancing valve are set at the outlet of the high-pressure accumulator. They are in a closed state when the accumulator is pressurized to improve the safety of the system. During the test, the balancing valve is opened first, and the main valve is opened after the pressure on both sides of the main valve is balanced, so that the test conditions are met. In summary, the existing test method is to form the required pressure shock curve in the simulation test chamber by passing a certain volume of high-pressure gas through the flow-limiting throat, where the volume of the simulation test chamber is fixed and the exhaust port area is fixed, which causes the falling rate of the descending section of the pressure shock curve to be higher than the test requirement, making the test piece pass the test. The simulation accuracy of the pressure shock curve is low and cannot meet the test requirements. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a gas shock test system and a pressure curve control method, which controls the exhaust area of ​​the simulated test chamber by obtaining a diaphragm rupture signal to increase the descent rate of the pressure shock curve and improve the simulation accuracy of the pressure shock curve.

[0005] The technical solution of the present invention is: a gas impact test system, including a high-pressure accumulator, a bursting disc I, a bursting disc II, a simulation test chamber and a control system connected in sequence; the bursting disc II is provided with a bursting fragment target sensor, the simulation test chamber is provided with a pressure measuring seat, a plurality of normally open exhaust holes and a plurality of exhaust flanges, the exhaust flange is provided with a flange plug cover outside, the flange plug cover seals the exhaust flange end through a plug cover opening controller, and the plug cover opening controller and the bursting fragment target sensor are remotely controlled through the control system.

[0006] An opening controller mounting seat is provided at the end of the exhaust flange, the plugging cover opening controller is fixedly mounted on the upper part of the opening controller mounting seat, a plugging cover rotating shaft is provided at the lower part of the opening controller mounting seat, the lower end of the flange plugging cover is rotatably connected to the opening controller mounting seat through the plugging cover rotating shaft, and the upper end of the flange plugging cover is connected to the plugging cover opening controller through a hook.

[0007] A pressure sensor is installed on the pressure measuring seat, and a test hole is provided at the center of the pressure measuring seat. The test hole is connected to the internal cavity of the test simulation cabin, and the diameter of the test hole is 2mm.

[0008] The high-pressure accumulator tank is provided with a high-pressure accumulator tank safety valve and a high-pressure accumulator tank valve.

[0009] A bursting disc pipeline inflation valve and a bursting disc pipeline deflation valve are arranged between the bursting discs I and II, and the bursting disc pipeline inflation valve is connected to the high-pressure accumulator tank.

[0010] The number of the normally open exhaust holes is ≥1, and the number of the exhaust flanges is ≥1.

[0011] The blocking cover opening controller is an electromagnetic device controller.

[0012] A pressure curve control method for a gas shock test system, using any of the gas shock test systems described above, the specific process is as follows:

[0013] S1: Preparation before the gas shock test system test;

[0014] According to the specific test plan, adjust the number of normally open exhaust holes and exhaust flanges. Since the opening controller of the flange plug cover is a detachable device and can be installed on the exhaust port flange of the simulation test cabin, the number of flange plug covers on the simulation test cabin can be adjusted at will;

[0015] S1: Carry out system gas shock commissioning test;

[0016] During system commissioning, the exhaust flange is sealed with a flange plug, and the high-pressure gas in the high-pressure accumulator enters the pipeline, so that the bursting discs I and II burst successively, and the peak time T of the pressure curve of the test simulation test chamber is recorded;

[0017] S2: Perform gas shock test;

[0018] Replace bursting discs I and II, set the same pressure as in S2, and let the high-pressure gas in the high-pressure accumulator enter the pipeline to make bursting disc I explode. After the bursting disc II is detected to have exploded by the bursting fragment target sensor, the control system remotely controls the cover opening controller to operate after a delay time T, releases the hook, and the flange cover opens instantly under the action of the high air pressure in the simulated test chamber, thereby instantly increasing the exhaust area and the exhaust rate.

[0019] The technical effects of the present invention are: 1. The present invention obtains a diaphragm rupture signal to control the exhaust area of ​​a simulated test chamber, thereby increasing the falling rate of a pressure shock curve and improving the simulation accuracy of the pressure shock curve; 2. The plug opening mechanism of the present invention is a detachable device that can be installed on the exhaust port flange of the test chamber. The number of adjustable exhaust plugs of the test chamber can be adjusted as needed, and the operation is simple and convenient.

[0020] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of a gas shock test system of the present invention.

[0022] Figure 2 This is a schematic diagram of a gas shock test system in a closed state with a plugging cover according to the present invention.

[0023] Figure 3 This is a schematic diagram of a gas shock test system in an open state with a plugging cover of the present invention.

[0024] Figure 4 This is a comparison chart of test results of a gas shock test system of the present invention.

[0025] Figure markings: 1-high-pressure accumulator tank, 2-bursting fragment target sensor, 3-normally open exhaust hole, 4-simulation test chamber, 5-blocking cover opening controller, 6-flange blocking cover, 7-control system, 8-bursting disc I, 9-bursting disc II, 10-exhaust flange, 11-opening controller mounting seat, 12-blocking cover rotating shaft, 13-hook, 14-pressure measuring seat, 15-high-pressure accumulator tank safety valve, 16-high-pressure accumulator tank valve, 17-bursting disc pipeline inflation valve, 18-bursting disc pipeline deflation valve. DETAILED DESCRIPTION

[0026] Example 1

[0027] In order to overcome the problem that the existing simulation test chamber has a fixed volume and a fixed exhaust port area, resulting in the pressure shock curve having a decreasing rate higher than the test requirement and the test piece being in an over-test state, the present invention provides a method as follows: Figure 1 A gas shock test system is shown. The present invention obtains a diaphragm rupture signal to control the exhaust area of ​​a simulated test chamber to increase the decreasing rate of the pressure shock curve and improve the simulation accuracy of the pressure shock curve.

[0028] like Figure 1 As shown, a gas impact test system includes a high-pressure accumulator 1, a bursting disc I8, a bursting disc II9, a simulation test chamber 4 and a control system 7 connected in sequence; the bursting disc II9 is ​​provided with a bursting fragment target sensor 2, the simulation test chamber 4 is provided with a pressure measuring seat 14, a plurality of normally open exhaust holes 3 and a plurality of exhaust flanges 10, the exhaust flange 10 is provided with a flange plug 6 outside, the flange plug 6 seals the end of the exhaust flange 10 through a plug opening controller 5, and the plug opening controller 5 and the bursting fragment target sensor 2 are remotely controlled through the control system 7.

[0029] The present invention obtains the bursting disc II 9 diaphragm rupture signal through the bursting disc target sensor 2. The bursting disc target sensor 2 is specifically a wire (with an insulating outer skin) pasted on the bursting disc. Before the test, the target line is in a through state. When the bursting disc ruptures, the wire pasted on the bursting disc will be disconnected, and the target line is in an open circuit state. The time when the bursting disc is opened is obtained by measuring the on and off of the target line. The control system 7 remotely controls the plugging cover opening controller 5 to open the flange plugging cover 6, thereby controlling the exhaust area of ​​the simulated test chamber 4 to increase the falling rate of the pressure shock curve and improve the simulation accuracy of the pressure shock curve.

[0030] Example 2

[0031] Preferably, on the basis of Example 1, in this embodiment, Figure 2 , Figure 3 As shown, an opening controller mounting seat 11 is provided at the end of the exhaust flange 10, and the plugging cover opening controller 5 is fixedly mounted on the upper part of the opening controller mounting seat 11, and a plugging cover rotating shaft 12 is provided at the lower part of the opening controller mounting seat 11. The lower end of the flange plugging cover 6 is rotatably connected to the opening controller mounting seat 11 through the plugging cover rotating shaft 12, and the upper end of the flange plugging cover 6 is connected to the plugging cover opening controller 5 through a hook 13.

[0032] In actual use, the plug cover opening controller 5 is fixedly mounted on the upper part of the opening controller mounting seat 11, and a plug cover rotating shaft 12 is provided at the lower part of the opening controller mounting seat 11. The lower end of the flange plug cover 6 is rotatably connected to the opening controller mounting seat 11 through the plug cover rotating shaft 12, and the upper end of the flange plug cover 6 is connected to the plug cover opening controller 5 through a hook 13. After receiving the opening instruction, the plug cover opening controller 5 rotates the opening hook 13, and the flange plug cover rotates and opens under the high pressure inside the test chamber, and the upper end of the flange plug cover 6 pops outward and rotates downward due to gravity through the plug cover rotating shaft 12, which can instantly increase the exhaust area.

[0033] Preferably, on the basis of Example 1, in this embodiment, a pressure sensor is installed on the pressure measuring seat 14, a test hole is provided at the center of the pressure measuring seat 14, the test hole is connected to the internal cavity of the test simulation cabin 4, and the diameter of the test hole is 2 mm.

[0034] In actual use, the real-time and accurate measurement of the pressure in the simulation test chamber 4 is achieved through the pressure sensor, and the operation is simple and convenient.

[0035] Preferably, on the basis of Embodiment 1, in this embodiment, the high-pressure accumulator tank 1 is provided with a high-pressure accumulator tank safety valve 15 and a high-pressure accumulator tank valve 16. A bursting disc pipeline inflation valve 17 and a bursting disc pipeline deflation valve 18 are provided between the bursting discs I8 and II9, and the bursting disc pipeline inflation valve 17 is connected to the high-pressure accumulator tank 1.

[0036] In actual use, the high-pressure accumulator tank 1 is provided with a high-pressure accumulator tank safety valve 15 and a high-pressure accumulator tank valve 16 to ensure safe use of the high-pressure accumulator tank 1. A bursting disc pipeline charging valve 17 and a bursting disc pipeline deflation valve 18 are provided between the bursting discs I8 and II9, and the bursting disc pipeline charging valve 17 is connected to the high-pressure accumulator tank 1. The detonation of the bursting disc during the test can be adjusted.

[0037] Preferably, on the basis of Embodiment 1, in this embodiment, the number of the normally open exhaust holes 3 is ≥1, and the number of the exhaust flanges 10 is ≥1.

[0038] In actual use, the number of adjustable exhaust plugging covers of the test chamber can be adjusted according to needs, and the operation is simple and convenient.

[0039] Preferably, on the basis of Embodiment 1, in this embodiment, the blocking cover opening controller 5 is an electromagnetic device controller.

[0040] In actual use, the plug cover opening controller 5 is an electromagnetic device controller. After receiving the opening instruction, the electromagnetic device rotates the opening hook 13 without time delay, so that the flange plug cover 6 can be opened quickly and instantly.

[0041] Example 3

[0042] Based on Example 2, a pressure curve control method for a gas shock test system is provided, using any of the gas shock test systems described above, and the specific process is as follows:

[0043] S1: Preparation before the gas shock test system test;

[0044] According to the specific test plan, adjust the number of normally open exhaust holes 3 and exhaust flanges 10. Since the opening controller 5 of the flange plug cover 6 is a detachable device and can be installed on the exhaust port flange 10 of the simulation test chamber 4, the number of flange plug covers 6 on the simulation test chamber 4 can be adjusted at will. For example, in a certain test, the fixed exhaust ports are 4 DN115 exhaust ports and the exhaust flanges 10 are 6 DN115;

[0045] S1: Carry out system gas shock commissioning test;

[0046] During system commissioning, the exhaust flange 10 is sealed with the flange plug 6, and the high-pressure gas in the high-pressure accumulator enters the pipeline, so that the bursting disc I8 and the bursting disc II9 burst successively, and the peak time T of the pressure curve of the test simulation test chamber 4 is recorded;

[0047] S2: Perform gas shock test;

[0048] Replace bursting discs I8 and II9, set the same pressure as that in S2, and let the high-pressure gas in the high-pressure accumulator enter the pipeline to make bursting disc I8 explode. After the bursting disc II9 is ​​detected to have exploded by the bursting fragment target sensor 2, the control system 7 remotely controls the plugging cover opening controller 5 to operate after a delay time T, releases the hook 13, and the flange plugging cover 6 is instantly opened under the action of the high air pressure in the simulation test chamber 4, thereby instantly increasing the exhaust area and increasing the exhaust rate.

[0049] The test chamber pressure curve obtained during the formal test is as follows: Figure 4 shown. Figure 4 In the figure, the P0 curve represents the test target curve, the P1 curve represents the fixed exhaust port pressure curve, and the P2 curve represents the adjustable exhaust port pressure curve of the present invention. It can be seen from the figure that 1. The rise of the pressure shock curve with adjustable exhaust port control coincides with the fixed exhaust port and the target curve; 2. The peak moment does not change, and the peak pressure is slightly higher than the target pressure as required; 3. The pressure drop rate is greater than the solid exhaust port pressure drop rate, and coincides with the target pressure curve. The test results show that the present invention improves the drop rate of the pressure shock curve, improves the simulation accuracy of the pressure shock curve, and thus improves the test technology.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A gas shock test system, characterized in that: The invention comprises a high-pressure accumulator (1), a bursting disc I (8), a bursting disc II (9), a simulation test chamber (4) and a control system (7) connected in sequence; the bursting disc II (9) is provided with a bursting fragment target sensor (2); the simulation test chamber (4) is provided with a pressure measuring seat (14), a plurality of normally open exhaust holes (3) and a plurality of exhaust flanges (10); the exhaust flange (10) is provided with a flange plug (6) outside; the flange plug (6) seals the end of the exhaust flange (10) through a plug opening controller (5); the plug opening controller (5) and the bursting fragment target sensor (2) are remotely controlled through the control system (7); the end of the exhaust flange (10) is provided with an opening controller mounting seat (11); The plugging cover opening controller (5) is fixedly mounted on the upper part of the opening controller mounting seat (11), and a plugging cover rotating shaft (12) is provided on the lower part of the opening controller mounting seat (11). The lower end of the flange plugging cover (6) is rotatably connected to the opening controller mounting seat (11) via the plugging cover rotating shaft (12), and the upper end of the flange plugging cover (6) is connected to the plugging cover opening controller (5) via a hook (13). The bursting fragment target sensor (2) is a wire attached to the bursting fragment II (9). When the bursting fragment II (9) ruptures, the wire is disconnected. The time when the bursting fragment II (9) is opened is obtained by measuring the continuity of the wire. The control system (7) remotely controls the plugging cover opening controller (5) to open the flange plugging cover (6), thereby controlling the exhaust area of ​​the simulation test chamber (4).

2. A gas shock test system according to claim 1, characterized in that: A pressure sensor is installed on the pressure measuring seat (14), and a test hole is provided at the center of the pressure measuring seat (14). The test hole is connected to the internal cavity of the simulation test chamber (4), and the diameter of the test hole is 2 mm.

3. A gas shock test system according to claim 1, characterized in that: The high-pressure accumulator tank (1) is provided with a high-pressure accumulator tank safety valve (15) and a high-pressure accumulator tank valve (16).

4. A gas shock test system according to claim 1, characterized in that: A bursting disc pipeline inflation valve (17) and a bursting disc pipeline deflation valve (18) are provided between the bursting discs I (8) and the bursting discs II (9), and the bursting disc pipeline inflation valve (17) is connected to the high-pressure accumulator tank (1).

5. A gas shock test system according to claim 1, characterized in that: The number of the normally open exhaust holes (3) is ≥1, and the number of the exhaust flanges (10) is ≥1.

6. A gas shock test system according to claim 1, characterized in that: The blocking cover opening controller (5) is an electromagnetic device controller.

7. The pressure curve control method of any one of claims 1 to 6, characterized in that: The process includes: S1: Preparation before the gas shock test system test; According to the specific test plan, the number of normally open exhaust holes (3) and exhaust flanges (10) is adjusted. Since the flange plugging cover (6) opening controller (5) is a detachable device and can be installed on the exhaust flange (10) of the simulation test chamber (4), the number of flange plugging covers (6) on the simulation test chamber (4) can be adjusted at will; S2: Carry out system gas shock commissioning test; During system commissioning, the exhaust flange (10) is sealed with a flange plug (6), and the high-pressure gas in the high-pressure accumulator (1) is introduced into the pipeline, so that the bursting disc I (8) and the bursting disc II (9) are successively exploded, and the peak time T of the pressure curve of the test simulation test chamber (4) is recorded; S3: Perform gas shock test; Replace the bursting disc I (8) and the bursting disc II (9), set the same pressure as in S2, and let the high-pressure gas in the high-pressure accumulator (1) enter the pipeline to cause the bursting disc I (8) to explode. After the bursting disc II (9) is detected to have exploded by the bursting disc target sensor (2), the control system (7) remotely controls the plug cover opening controller (5) to operate after a delay time T, releases the hook (13), and the flange plug cover (6) is instantly opened under the action of the high gas pressure in the simulation test chamber (4), thereby instantly increasing the exhaust area and the exhaust rate.

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