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Study on the mechanism of near-field underwater explosion on supported thin plates with prefabricated holes

Acta Mechanica Sinica 2024年第8期40卷 32-44页

作者： Si Chen Jian Qin Xiangyao Meng Zhichao Lai Yanbo Wen Ruiyuan Huang School of Mechatronical Engineering Beijing Institute of TechnologyBeijing100081China Naval Academy Beijing100161China College of Civil Engineering Fuzhou UniversityFuzhou350116China

In this study,underwater explosion tests with 2.5 g trinitrotoluene explosive under different fixed plates with prefabricated holes were *** experimental results showed that the air inflow from the prefabricated hole caused the bubble to collapse earlier with an increase in the hole *** addition,the deformation mode of the thin plate transitioned from“convex”to“concave”(up to down).Next,the coupled Eulerian-Lagrangian method was used to perform the corresponding numerical *** accuracy of the numerical simulation method was verified through a comparison with the experimental *** addition,a series of numerical simulations were conducted with different prefabricated-hole diameters,blast distances,and prefabricated-hole *** results showed that the bubble-pulsating water jet substantially influenced the deformation of the thin plate when the diameter of the prefabricated hole was within the theoretical maximum bubble *** the blast distance was within the theoretical maximum bubble radius,the thin plate was subjected to only a single bubble pulsation owing to the air inflow from the prefabricated hole.

关键词： Underwater explosion Hole High-speed camera bubble pulsation Fixed plate

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Effect of nonlinear translations on the pulsation of cavitation bubbles

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Chinese Physics B 2022年第4期31卷 381-384页

作者： Lingling Zhang Weizhong Chen Yang Shen Yaorong Wu Guoying Zhao Shaoyang Kou Key Laboratory of Modern Acoustics(Ministry of Education) Institute of AcousticsNanjing UniversityNanjing 210093China

The pulsations and translations of cavitation bubbles obey combined ordinary differential equations,and their nonlinearities are studied by the bifurcation diagram and the phase diagram in a strong ultrasonic *** pulsation can change regularly or irregularly with changing driving pressure in the time *** bifurcation diagrams of the pulsation versus driving pressure show that the pulsations and translations of bubbles have nonlinear characteristics,and the nonlinear translations of bubbles can disorder the pulsations for certain *** of the pulsation can also be caused by nonlinear pulsation *** addition,the phase diagrams also show that the nonlinear translations make a large contribution to the *** same result can also be obtained when the ambient radii of two bubbles are different.

关键词： bubble pulsation bubble translation nonlinear characteristics

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