自由水面和刚性水底联合作用下水下爆炸气泡上浮运动特性研究

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

在浅水爆炸时,气泡运动同时受到自由水面和刚性水底的联合作用,现有的上浮位移理论计算模型并不适用。建立了自由水面和刚性水底联合作用下水下爆炸气泡上浮位移理论模型,同时,在爆炸水池内开展了TNT(Trinitrotoluene)装药的气泡上浮试验,采用高速相机拍摄了气泡运动的演化过程,对图像进行智能化识别处理后得到了气泡上浮位移规律。结果表明,TNT装药气泡上浮的试验结果与理论模型计算结果的相对偏差范围为-11.7%~8.2%,理论模型精度满足工程应用要求,可为水下爆炸对舰船的毁伤评估提供技术支撑。

During shallow water explosion,bubble motion is subject to the combined action of a free surface and a rigid bottom,therefore existing theoretical models for bubble migration are not applicable.In this paper,atheoretical model of bubble migration for underwater explosion under the combined action of a free surface and a rigid bottom was established.At the same time,the underwater explosion experiment of TNT(Trinitrotoluene)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 can meet the requirement of engineering application,which may provide technical support for the damage assessment for ship structures.