Analysis of underwater shock wave attenuation by air bubble curtain based on bubble shape

SI Jianfeng; ZHONG Dongwang; LI Leibin

doi:10.11883/bzycj-2020-0136

Volume 41 Issue 7

Jul. 2021

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SI Jianfeng, ZHONG Dongwang, LI Leibin. Analysis of underwater shock wave attenuation by air bubble curtain based on bubble shape[J]. Explosion And Shock Waves, 2021, 41(7): 073201. doi: 10.11883/bzycj-2020-0136

Citation:

SI Jianfeng, ZHONG Dongwang, LI Leibin. Analysis of underwater shock wave attenuation by air bubble curtain based on bubble shape[J]. Explosion And Shock Waves, 2021, 41(7): 073201. doi: 10.11883/bzycj-2020-0136

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Analysis of underwater shock wave attenuation by air bubble curtain based on bubble shape

doi: 10.11883/bzycj-2020-0136

SI Jianfeng^{1, 2
,},
ZHONG Dongwang^{1, 2
,
,},
LI Leibin³

1.
School of Science, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China
2.
Hubei Province Intelligent Blasting Engineering Technology Research Center, Wuhan 430065, Hubei, China
3.
China Railway Guangzhou Engineering Group Co., Ltd., Guangzhou 511459, Guangdong, China

Received Date: 2020-05-06
Rev Recd Date: 2020-09-07

Available Online: 2021-06-24

Publish Date: 2021-07-05

Abstract

Abstract

Bubble curtain is an important means for protection against underwater explosion shock wave. It is of great significance to study the mechanism and technical parameters of bubble curtain regarding the safety and application of underwater blasting. By using high-speed photography technology and video framing processing technology, indoor small underwater bubble curtain model is photographed and analyzed. It is found that the gas curtain is highly discontinuous and inhomogeneous in both the formation process and the interaction process with the underwater explosion shock wave. The gas and liquid are mixed in the air curtain area, and the interface contour is complex and diverse. Air displacement will directly affect the quality of the air bubble curtain. The larger the air displacement, the better the continuity and quality of air curtain. On this basis, considering the influences of bubble shape, interface, and gas-liquid coexistence, programming is carried out through the APDL language that comes with the LS-DYNA finite element software. By setting the variation range of bubble diameter and the minimum difference between bubble diameters, a certain number of bubbles of different diameters are randomly positioned to simulate the bubble distributions in the real air curtain. The air curtain quality under different gas source pressure can be simulated by changing the number of bubbles in the set air curtain area. It is found that this method can better reflect the protection mechanism of air curtain against the shock wave. Comparing the protective performance of air curtain with different bubble numbers on the same shock wave, it shows that the protective performance increases with the increase of bubble density. However, when the number of bubbles reaches a threshold number, the overall continuity and stability of the air curtain are basically fixed, and the protection effect tends to be stable.
- bubble curtain,
- underwater blasting,
- shock wave,
- numerical analysis,
- random distributio

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References(15)

References

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