装药深度及空气域尺寸对水下爆炸的影响分析

Effects of Charge Depth and Air Domain Size on Underwater Explosion

在水下爆炸试验中,很难开展针对装药深度及影响数值计算精度的空气域尺寸研究,因此,数值仿真就成为研究水下爆炸的重要手段。文中基于离心机水下爆炸试验,利用二维、三维模型对超重力场下的球形炸药水下爆炸进行仿真,并与试验结果进行对比,验证了所建模型的合理性。在2个模型的基础上,同时建立具有不同装药深度及空气域尺寸的模型,以研究两者对水下爆炸冲击波及气泡脉动数值仿真结果的影响。研究表明:装药深度越大,距离炸药中心相同测距处的冲击波峰值越大,但峰值随装药深度的增幅并不明显;空气域尺寸大小对水下爆炸气泡脉动计算影响也很小。

In underwater explosion test,it is difficult to carry out research on the charge depth and the air domain size which affects the accuracy of numerical calculation.In this paper,based on the underwater explosion test of centrifuge,underwater explosion of spherical explosive under super-gravity field is simulated using two-dimensional and three-dimensional models,and the simulation results are compared with the test data to verify the rationality of the two models.Then,different charge depth and air domain size are added to the two models to analyze the effects of the two factors on simulation results of underwater explosion shock wave and bubble pulsation.The simulation results show that the greater the charge depth,the larger the shock wave peak values at the same distance from the center of the explosive,but the increase rate of the peak value with the charge depth is small;and the air domain size has little effect on numerical results of the underwater explosion bubble pulsation.