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

近场水下爆炸对预制破口固支薄板的作用机理研究

作　　者：Si Chen Jian Qin Xiangyao Meng Zhichao Lai Yanbo Wen Ruiyuan Huang 陈思;秦健;孟祥尧;赖志超;文彦博;黄瑞源

机构地区：[1]School of Mechatronical Engineering,Beijing Institute of Technology,Beijing,100081,China [2]Naval Academy,Beijing,100161,China [3]College of Civil Engineering,Fuzhou University,Fuzhou,350116,China

出　　处：《Acta Mechanica Sinica》2024年第8期32-44,共13页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12172178).

摘　　要：In this study,underwater explosion tests with 2.5 g trinitrotoluene explosive under different fixed plates with prefabricated holes were conducted.The experimental results showed that the air inflow from the prefabricated hole caused the bubble to collapse earlier with an increase in the hole diameter.In 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 simulation.The accuracy of the numerical simulation method was verified through a comparison with the experimental data.In addition,a series of numerical simulations were conducted with different prefabricated-hole diameters,blast distances,and prefabricated-hole shapes.The 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 radius.When 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.本文开展了2.5 g TNT炸药在不同预制破口固支薄板下方的水下爆炸实验.实验结果表明:随着破口直径的增加,空气从预制破口涌入将导致气泡更早溃灭,薄板的变形模式也将由“上凸”变形转变为“下凹”变形.接着采用CEL方法开展了对应的数值模拟,并通过实验数据的对比验证了数值模拟方法的准确性.然后开展了不同预制破口直径、不同爆距合不同预制破口形状下的系列数值模拟,结果表明:气泡脉动水射流在预制破口直径在理论最大气泡半径以内时,其对薄板变形的影响很大;爆距在理论最大气泡半径以内时,由于空气从预制破口涌入从而导致薄板只受到单次气泡脉动作用.

关 键 词：Underwater explosion HOLE High-speed camera Bubble pulsation Fixed plate 

分 类 号：O38[理学—流体力学]