Impact initiation of a solid-rocket engine by a shaped-charge jet

PANG Songlin; CHEN Xiong; XU Jinsheng; WANG Yongping

doi:10.11883/bzycj-2019-0469

Volume 40 Issue 8

Aug. 2020

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PANG Songlin, CHEN Xiong, XU Jinsheng, WANG Yongping. Impact initiation of a solid-rocket engine by a shaped-charge jet[J]. Explosion And Shock Waves, 2020, 40(8): 082101. doi: 10.11883/bzycj-2019-0469

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PANG Songlin, CHEN Xiong, XU Jinsheng, WANG Yongping. Impact initiation of a solid-rocket engine by a shaped-charge jet[J]. Explosion And Shock Waves, 2020, 40(8): 082101. doi: 10.11883/bzycj-2019-0469

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Impact initiation of a solid-rocket engine by a shaped-charge jet

doi: 10.11883/bzycj-2019-0469

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
The 41st Institute, the Sixth Academy, China Aerospace Science and Industry Corporation, Hohhot 010010, Inner Mongolia, China

Received Date: 2019-12-14
Rev Recd Date: 2020-05-14

Available Online: 2020-06-25

Publish Date: 2020-08-01

Abstract

Abstract

In order to study the impact of the metal jet formed by a shaped charge on a solid-rocket engine, the shaped-charge blasting experiment was carried out, and the jet impingement experiment was performed for the shaped jet impacting a certain-size engine without protection. A high-speed camera was used to record the response processes of the explosions. Air overpressures and fragment velocities were measured at different distances and in different directions. The jet forming process and the jet-impacting-motor process were numerically simulated by using the finite element software AUTODYN. And in the simulation, the problem of fluid-solid coupling grid leakage was avoided by adjusting the grid thickness. The experimental results show that when the rocket engine was impacted by the jet, it exploded violently and the propellant reacted completely. The steel equipment fixing the rocket engine after the explosion was almost destroyed completely. The velocity of fragments reached above 4 700 m/s. The air overpressure at 1 m away from the explosion center of the engine reached 19.78 MPa. Through the pictures collected by the high-speed camera, it could be judged that the temperature in the explosion center reached above 3 000 ℃. According to the peak of the air overpressure and the law of air similarity, the energy produced by this type of propellant explosion was slightly higher than those produced by explosives such as 8701 and TNT. The simulated results show that when the jet impinged on the engine shell at the head velocity of 7 000 m/s, the tip of the jet head was severely ablated, and the velocity of the jet head decreased to about 5 600 m/s; the propellant reacted violently while being penetrated 1−2 mm by the jet; the shock wave propagated along the propellant in a spherical shape, and the propellant on the other side underwent shock initiation twice with a retonation; there were three overpressure peaks at the Gauss point located in the center of the propellant. The first peak was generated by the shock wave from the left side; the second peak was due to the shock wave hitting the solid wall of the propellant and a certain wave surface reflection was generated, causing a pressure rise; the third peak was caused by a new shock wave generated by the retonation. The simulated average air overpressure peak is 18.75 MPa at the three Gauss points set at 1 m from the center of the engine, which is in good agreement with the experimental results.
- shock initiation,
- shaped-charge jet,
- solid-rocket motor,
- retonation

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References(18)

References

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