基于边界元方法的气泡脉动诱导壁压特性

Research on characteristics of pressure of cylindrical shell subject to underwater explosion bubble pulsating load based on BEM

针对圆柱壳结构在水下爆炸气泡脉动载荷作用下的诱导壁压特性,采用Geers-Hunter模型得到气泡脉动运动,在势流假设下采用边界元方法建立了水下爆炸气泡脉动载荷壁压计算方法,通过对不同水下爆炸工况进行计算分析发现:圆柱壳表面的气泡诱导壁压有明显的绕射现象,在爆距较小时迎爆面气泡脉动诱导压力峰值要远大于背爆面压力;在圆柱壳轴向上随距中心点距离的增大绕射特性逐渐减小,壁压向自由场压力逼近。所得到的方法和规律可为潜艇抗冲击设计和评估人员提供参考。

The diffraction characteristics of cylindrical shell subject to underwater explosion bubble pulsating load are studied in this paper. Geers-Hunter model is adopted to simulate the bubble motions,while the bubble induced hydrodynamic pressure is calculated by the numerical model based on boundary element method under potential flow assumption. Through analysis of different underwater explosion cases, we found that the diffraction effect has obvious influence on the bubble induced pressure. For small standoff distance, the bubble induced pressure at the front of the cylinder is much greater than that at the back one. With increasing the axial distance from the center of the cylinder, the diffraction effect decreases and the pressure is approaching the free field one gradually. The numerical model and the conclusion could be reference for anti-shock researchers and designers of submarine.