A study on migration characteristics for underwater explosion bubble under combined action of a free surface and a rigid bottom

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 1-7.

SHENG Zhenxin1,2，LIU Jianhu1,2，WANG Haikun1,2，ZHANG Yongkun3，LI Liye1,2

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Abstract

During shallow water explosion, the bubble motion is subject to the combined action of free surface and rigid bottom, therefore the existing theoretical models for bubble migration are not applicable. In this paper, the theoretical model of bubble migration for underwater explosion under the combined action of free surface and rigid bottom was established. At the same time, the underwater explosion experiment of TNT charge was carried out, and the evolution process of bubble motion was photographed with a high-speed camera, then the bubble migration law was obtained after intelligent processing. The results show that: the deviation of bubble migration between the theoretical calculation results and test experimental results were -11.7%~8.2%. The accuracy of the theoretical model could meet the requirement of engineering application, which could provide technical support for the damage assessment for ship structure.

Key words

bubble migration / theoretical model / optical measurement / image recognition

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SHENG Zhenxin1,2，LIU Jianhu1,2，WANG Haikun1,2，ZHANG Yongkun3，LI Liye1,2. A study on migration characteristics for underwater explosion bubble under combined action of a free surface and a rigid bottom[J]. Journal of Vibration and Shock, 2023, 42(12): 1-7

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