Performance test method and tester for soft isolation device of pulse solid engine

Abstract

The invention relates to the technical field of solid rocket engines, in particular to a performance testing method and tester for a soft isolation device of a pulse solid engine. The tester consists of a front end cover, a shell I, an isolation device fixing seat, a soft isolation device and a rear end cover, wherein the front end cover is connected with the shell I through a bolt assembly; the shell I is fixedly connected with the soft isolation device through a flange; a soft isolation device is fixed on the isolation device fixing seat; the isolation device fixing seat is connected with the rear end cover through a flange. According to the invention, the isolation device is connected with the shell through the flange to form a forward closed area and a backward closed area of the isolation device, and the performance data test of forward pressure bearing and reverse opening pressure of the soft isolation device can be carried out. The tester is used for element-level performance verification, and the performance of the isolation device is verified before the whole machine test, so that the development cost can be reduced, the development period can be shortened, and the development risk can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solid rocket engines, and particularly relates to a performance test method and a tester for a soft isolation device of a pulse solid engine. Background Art

[0002] The isolation device divides the combustion chamber of the pulse solid rocket engine into multiple independent units axially or radially. Different units work in sequence without interference, enabling the solid rocket engine to have the ability to work multiple times. The isolation device needs to withstand the gas pressure and ablation (positive pressure bearing) on one side when the combustion chamber unit on that side is working. When the combustion chamber unit on the other side is working, it can be damaged to allow the gas to pass through (reverse opening). The positive pressure bearing and reverse opening pressure of the isolation device are key parameters for the isolation device to complete its work tasks. During the development process of the isolation device, it is necessary to conduct multiple reverse opening pressure tests to determine the appropriate layer thickness and layer weakening structure to ensure that the isolation device can be reliably opened (damaged) under a certain pressure.

[0003] The isolation device can be divided into a hard isolation device and a soft isolation device. The hard isolation device generally adopts structures such as metal blasting type, plug type, and ceramic bursting disc, completely dividing the combustion chamber into independent spaces. The soft isolation device is made of rubber material and is wrapped on the surface of the grain, with a certain gap. During the operation of one pulse grain, the soft isolation device is closely attached to the two-pulse grain. When the two-pulse is ignited, the ignition gas propagates through the gap between the soft isolation device and the grain, and under the action of the gas pressure, the isolation device is damaged at the weakening structure. In a performance test tester for an isolation device of a pulse engine with the existing patent publication number CN 221445692 U, a tester for the performance of an isolation device including a front top cover, a rear top cover, a first cylinder, a second cylinder, an isolation device, and a fixing seat is proposed. The two sides of its isolation device are cylindrical cylinders, which cannot simulate the flow field environment when the soft isolation device is opened. The cylinder section on the opening side of the isolation device proposed by the prior art is cylindrical, and the performance of the soft isolation device cannot be tested.

[0004] Currently, during the development process of pulse engines, the performance verification of isolation devices is mostly carried out along with the engines, and the whole machine test method is used for verification, which has a long cycle and high cost. Summary of the Invention

[0005] Based on the above technical problems, the present invention proposes a performance test method and a tester for a soft isolation device of a pulse solid engine to solve the problems that the existing tester cannot simulate the flow field environment when the soft isolation device is opened and cannot test the performance of the soft isolation device. The present invention proposes to use a special-shaped cylinder on the opening side of the soft isolation device to simulate the flow field shape used by the two-pulse ignition device during ignition, which is closer to the actual use situation of the soft isolation device.

[0006] To solve the above technical problems, one of the objectives of the present invention is to provide a performance test tester for a soft isolation device of a pulse solid rocket motor. The tester is composed of a front end cover 1, a first housing 2, an isolation device fixing seat 3, a soft isolation device 4 and a rear end cover 5. The front end cover 1 is connected to the first housing 2 through a bolt assembly; the first housing 2 is fixedly connected to the soft isolation device 4 through a flange; the soft isolation device 4 is fixed on the isolation device fixing seat 3; the isolation device fixing seat 3 is connected to the rear end cover 5 through a flange.

[0007] Further, the inner surface of the first housing 2 is designed according to the shape of a two-pulse grain to simulate the structural form of the isolation device inside the motor and reduce the absorption of gas heat by the metal housing.

[0008] Further, an ethylene propylene diene monomer (EPDM) rubber thermal insulation layer is pasted on the inner wall of the first housing 2.

[0009] Further, on the opening side, the front end cover 1 is provided with a ignition hole and a pressure measurement hole, providing an installation space for the ignition device to provide the gas required for the opening test of the isolation device.

[0010] Further, the rear end cover 5 is provided with holes for discharging gas.

[0011] Further, O-ring seals are provided at each connection position to ensure that both sides of the isolation device are airtight areas.

[0012] Based on the same concept, the present invention also proposes a performance test method for a soft isolation device of a pulse solid rocket motor. The specific steps are as follows:

[0013] S1: Assemble the tester. During the test, the gas pressure generated by burning the ignition charge packet and the ignition device acts on the soft isolation device to simulate the load received by the soft isolation device during the operation of the solid rocket motor.

[0014] S2: Conduct a forward pressure-bearing test on the soft isolation device. According to the free volume of the internal cavity of the tester, calculate the amount of ignition charge required under a certain pressure. The ignition charge packet provides sufficient gas pressure for the forward pressure-bearing test of the soft isolation device. Place the ignition charge packet in the large-end cavity of the tester for ignition. During the test, monitor the pressure changes on both sides of the soft isolation device through the pressure measurement holes on the front and rear end covers.

[0015] S3: Inspect the soft isolation device after the forward pressure-bearing test. After the forward pressure-bearing test, remove the rear end cover of the tester and check whether there are any defects such as damage or perforation on the surface of the soft isolation device.

[0016] S4: Conduct the reverse opening test of the soft isolation device. Reassemble the rear end cover of the tester, and install an ignition device on the front end cover for the reverse opening test of the soft isolation device. During the test, monitor the pressure changes in the spaces on both sides of the soft isolation device through the pressure measurement holes on the front and rear end covers.

[0017] S5: Conduct an inspection after the reverse opening test of the soft isolation device. After the test, disassemble the tester and observe the situation of the reverse opening of the soft isolation device, whether it opens along the prefabricated weakening groove and the magnitude of the opening pressure.

[0018] Further, the specific content of S3 is as follows: Fill dry air into the soft isolation opening side through the pressure measurement hole on the front end cover of the tester, with the pressure not exceeding 0.15 MPa, and keep the pressure for 1 minute. Observe whether there is an obvious pressure drop (the pressure is lower than 0.12 MPa). If there is an obvious pressure drop, it indicates that the soft isolation device is damaged and the forward pressure-bearing test fails; otherwise, continue the test.

[0019] One or more of the above technical solutions of the present invention have at least one or more of the following technical effects: In the performance test tester of the present invention, the isolation device is connected to the housing through a flange, forming two closed areas on the front and back of the isolation device. By using an ignition charge or an ignition device to provide gas to simulate the load environment of the isolation device during the operation of the pulse engine, the performance data of the forward pressure-bearing and reverse opening pressure of the soft isolation device can be tested. By using the tester to conduct component-level performance verification and verifying the performance of the isolation device before the whole machine test, the development cost can be reduced, the development cycle can be shortened, and the development risk can be reduced. Description of the Drawings

[0020] Figure 1 : Schematic structural diagram of the isolation device tester of the present invention;

[0021] Figure 2 : Three-dimensional schematic diagram of the isolation device tester of the present invention;

[0022] Among them: 1 - front end cover, 2 - housing one, 3 - isolation device fixing seat, 4 - soft isolation device, 5 - rear end cover. Specific Embodiment

[0023] This tester mainly consists of Housing 1, fixing seat for isolation device, front top cover, rear top cover, bolts, nuts and several plugs. The housings are connected by flanges, and the top cover and the housing are connected by bolts. On the opening side, the front top cover is designed with ignition holes and pressure measurement holes, and an installation space for the ignition device is provided to supply the gas required for the opening test of the isolation device. The front top cover is connected to Housing 1 by bolts. The inner surface of Housing 1 is designed according to the shape of the two-pulse grain to simulate the structural form of the isolation device inside the engine. And in order to reduce the absorption of the gas heat by the metal housing, an ethylene propylene diene monomer (EPDM) rubber thermal insulation layer is also pasted on the inner wall of Housing 1. Housing 1 is fixedly connected to the isolation device through a flange. The isolation device is fixed on the fixing seat for isolation device. The fixing seat for isolation device is connected to the rear top cover by a flange. The rear top cover is provided with holes for discharging gas. O-ring seals are provided at each connection position to ensure that both sides of the isolation device are airtight areas.

[0024] This tester can be used for the forward pressure bearing and reverse opening pressure test of the soft isolation device, and can be reused. Compared with the prior art, the structure of the tester is optimized to adapt to the test requirements of the soft isolation device.

[0025] Next, in combination with the embodiments of the present invention and the drawings, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0026] This tester mainly consists of Housing 1, fixing seat for isolation device, front top cover, rear top cover and several plugs. The housings are connected by flanges, and the top cover and the housing are connected by bolts. On the opening side, the front top cover is designed with ignition holes and pressure measurement holes, and an installation space for the ignition device is provided to supply the gas required for the opening test of the isolation device. The front top cover is connected to Housing 1 by bolts. The inner surface of Housing 1 is designed according to the shape of the two-pulse grain to simulate the structural form of the isolation device inside the engine. And in order to reduce the absorption of the gas heat by the metal housing, an ethylene propylene diene monomer (EPDM) rubber thermal insulation layer is also pasted on the inner wall of Housing 1. Housing 1 is fixedly connected to the isolation device through a flange. The isolation device is fixed on the fixing seat for isolation device. The fixing seat for isolation device is connected to the rear top cover by a flange. The rear top cover is provided with holes for discharging gas. O-ring seals are provided at each connection position to ensure that both sides of the isolation device are airtight areas.

[0027] The test process of this tester is as follows:

[0028] In the first step, the overall assembly of the tester is carried out. During the test, the gas pressure generated by the combustion of the ignition charge and the ignition device acts on the soft isolation device to simulate the load received by the soft isolation device during the operation of the solid rocket engine.

[0029] In the second step, conduct the forward pressure-bearing test on the soft isolation device. According to the free volume of the internal cavity of the tester, calculate the amount of ignition charge required under a certain pressure. The ignition charge package provides sufficient gas pressure for the forward pressure-bearing test of the soft isolation device. Place the ignition charge package in the cavity at the large end of the tester for ignition. During the test, monitor the pressure changes on both sides of the soft isolation device through the pressure measurement holes on the front and rear end covers.

[0030] In the third step, conduct an inspection of the soft isolation device after the forward pressure-bearing test. After the forward pressure-bearing test, remove the rear end cover of the tester and check whether there are defects such as damage and perforation on the surface of the soft isolation device. Fill dry air into the opened side of the soft isolation device through the pressure measurement hole on the front end cover of the tester, with the pressure not exceeding 0.15 MPa, and keep the pressure for 1 minute. Observe whether there is an obvious pressure drop (the pressure is lower than 0.12 MPa). If there is an obvious pressure drop, it indicates that the soft isolation device is damaged and the forward pressure-bearing test fails. Otherwise, continue with the test.

[0031] In the fourth step, conduct the reverse opening test on the soft isolation device. Reassemble the rear end cover of the tester. Install an ignition device on the front end cover for the reverse opening test of the soft isolation device. During the test, monitor the pressure changes in the spaces on both sides of the soft isolation device through the pressure measurement holes on the front and rear end covers.

[0032] In the fifth step, conduct an inspection after the reverse opening test of the soft isolation device. After the test, disassemble the tester and observe the situation of the reverse opening of the soft isolation device, whether it opens along the prefabricated weakening groove and the magnitude of the opening pressure. Clean the tester and reuse it for the next soft isolation device test.

[0033] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

[0034] The present invention relates to a performance test tester for a soft isolation device of a pulse solid rocket engine. This technology has been applied in the development of the project to test the forward pressure-bearing and reverse opening performances of the soft isolation device. The isolation device is a key component of the pulse engine and has a crucial impact on the normal operation of the pulse engine. Existing technologies mostly use whole-machine tests to test the performance of the isolation layer. Using a tester to conduct component-level performance verification and verifying the performance of the isolation device before the whole-machine test can reduce the development cost, shorten the development cycle, and reduce the development risk.

Claims

1. A performance tester for a pulse solid rocket engine soft isolation device, characterized in that: The tester is composed of a front end cover (1), a shell (2), an isolation device fixing seat (3), a soft isolation device (4) and a rear end cover (5); the front end cover (1) is connected to the shell (2) via a bolt assembly; the shell (2) is fixedly connected to the soft isolation device (4) via a flange; the soft isolation device (4) is fixed on the isolation device fixing seat (3); and the isolation device fixing seat (3) is connected to the rear end cover (5) via a flange.

2. The performance tester for the soft isolation device of a pulse solid rocket engine according to claim 1, characterized in that: The inner surface of the shell one (2) is designed according to the shape of the double-pulse charge to simulate the structural form of the isolation device inside the engine and reduce the absorption of heat of the fuel gas by the metal shell.

3. The performance tester for the soft isolation device of a pulse solid rocket engine according to any one of claims 1 to 2, characterized in that: An EPDM rubber insulation layer is adhered to the inner wall of the shell 1 (2).

4. The performance tester for the soft isolation device of a pulse solid rocket engine according to claim 1, characterized in that: On the opening side, an ignition hole and a pressure measuring hole are arranged on the front cover (1), providing an installation space for an ignition device for providing the gas required for the opening test of the isolation device.

5. The performance tester for the soft isolation device of a pulse solid rocket engine according to claim 1, characterized in that: The rear end cover (5) is provided with a hole for releasing gas.

6. The performance tester for the soft isolation device of a pulse solid rocket engine according to claim 1, characterized in that: Each connection position is provided with an O-ring to ensure that both sides of the isolation device are airtight areas.

7. The testing method of the performance testing tester of the pulse solid rocket engine soft isolation device according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: S1: Conduct the tester assembly. During the test, the gas pressure generated by the combustion of the ignition charge and the ignition device acts on the soft isolation device to simulate the load on the soft isolation device during the operation of the solid rocket engine; S2: Carry out a forward pressure test on the soft isolation device. According to the free volume of the cavity inside the tester, calculate the amount of ignition powder required under a certain pressure. The ignition powder package provides sufficient gas pressure for the forward pressure test of the soft isolation device. The ignition powder package is placed in the cavity at the large end of the tester for ignition. During the test, the pressure changes on both sides of the soft isolation device are monitored through the pressure measuring holes on the front and rear end covers. S3: Check the soft isolation device after the positive pressure test. After the positive pressure test, remove the rear end cover of the tester and check whether there are any damage or perforation defects on the surface of the soft isolation device; S4: Perform a reverse opening test of the soft isolation device. Reassemble the rear end cover of the tester and install an ignition device on the front end cover for the reverse opening test of the soft isolation device. During the test, monitor the pressure changes in the space on both sides of the soft isolation device through the pressure measuring holes on the front and rear end covers. S5: Check after the reverse opening test of the soft isolation device. After the test, disassemble the tester to observe the reverse opening of the soft isolation device, whether it opens along the prefabricated weakening groove, and the size of the opening pressure.

8. The performance testing method of the soft isolation device of a pulse solid rocket engine according to claim 7, characterized in that: The S3 is specifically as follows: fill dry air from the pressure measuring hole on the front cover of the tester to the open side of the soft isolation, with the pressure not exceeding 0.15MPa, maintain the pressure for 1 minute, and observe whether there is an obvious pressure drop (pressure lower than 0.12MPa). If there is an obvious pressure drop, it means that the soft isolation device is damaged and the forward pressure test has failed; otherwise, continue the test.

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