Evolution of cavitation structure and collapse load characteristics during underwater vehicle exiting-water process

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 306-314.

GAO Shan1,2， SHI Yao1,2， PAN Guang1,2

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Abstract

During the process of high-speed vehicle exiting-water, its shoulder attached to cavitation across the free liquid surface collapse phenomenon, generating huge impact load, seriously affecting the vehicle exiting-water posture and structural safety. To investigate the evolution of the cavitation flow field details and the collapse load characteristics of the vehicle exiting-water process, this paper adopts the improved delayed detached eddy simulation model. The results show that: the collapse of the vehicle attached to the cavitation during exiting-water process occurs from top to bottom, and at the end of the collapse shrinks to a smaller isolated bubble, the collapse of the resulting high-speed jet impact on the surface of the structure. During the exiting-water process, the counter-rotating vortex pairs near the water surface led to the rapid collapse of the attached cavitation, and the development of the wall vortex structure represented by the hairpin vortex was obviously inhibited by the attached cavitation. The isolated bubble collapse generates a huge impact pressure peak, which causes great damage to the structural safety of the vehicle; However, the bubble collapse behavior on the face flow of the vehicle lead to the appearance of larger pressure peaks.

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vehicle / exiting-water / cavitation / collapse load / hairpin vortex

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GAO Shan1,2， SHI Yao1,2， PAN Guang1,2. Evolution of cavitation structure and collapse load characteristics during underwater vehicle exiting-water process[J]. Journal of Vibration and Shock, 2024, 43(2): 306-314

References

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