Modeling on the reflection and focusing process of the underwater explosion shock waves by an ellipsoidal reflector

GUO Rui; LIU Lei

doi:10.11883/bzycj-2017-0024

Volume 38 Issue 1

Nov. 2017

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GUO Rui, LIU Lei. Modeling on the reflection and focusing process of the underwater explosion shock waves by an ellipsoidal reflector[J]. Explosion And Shock Waves, 2018, 38(1): 174-182. doi: 10.11883/bzycj-2017-0024

Citation:

GUO Rui, LIU Lei. Modeling on the reflection and focusing process of the underwater explosion shock waves by an ellipsoidal reflector[J]. Explosion And Shock Waves, 2018, 38(1): 174-182. doi: 10.11883/bzycj-2017-0024

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Modeling on the reflection and focusing process of the underwater explosion shock waves by an ellipsoidal reflector

doi: 10.11883/bzycj-2017-0024

GUO Rui^1
,,
LIU Lei²

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven 5600MB, The Netherlands

Received Date: 2017-01-17
Rev Recd Date: 2017-03-02
Publish Date: 2018-01-25

Abstract

Abstract

In the present study, based on the theories of shock wave propagation and nonlinear reflection and focusing, we modelled the reflection and focusing of the underwater explosion shock waves by an ellipsoidal reflector, where the shock wave characteristics in three stages, those of the free propagation, the reflection on the wall and the directional focusing, were discussed respectively, and the corresponding methods on the pressure calculation were introduced. It was found that the discretized calculation domain of the pressure field is determined by employing the approximate geometric equations of the wave fronts and normal lines. Further, the focusing process was simulated and verification was performed by comparison with experimental data, with explanations given. The results indicate that this model can predict the positive focusing pressure with a precision that satisfies engineering requirements, keeping most errors below 10% and draw the focusing process of the shock waves and induced tensile waves in some detail; that the ellipsoidal reflector can focus underwater shock waves efficiently, generating an efficient gain region near the dynamic focus and weakening the attenuation along the closely axial direction; and that the dynamic focus appear ideally in front of the geometric focus, but it is also possible to move backward and even pass the geometric focus, due to actual deformation and backward displacement of the reflector.
- underwater explosion,
- ellipsoidal reflector,
- pressure distribution,
- focusing,
- gain

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References(20)

References

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