水深和药量的变化对水下爆炸气泡射流的影响研究

假设水下爆炸气泡脉动阶段的流场是无旋、不可压缩的理想流体,运用势流理论导出气泡边界面运动的控制方程,应用气泡动力学模型,用时边界积分法求解得到气泡等边界的变形及位置,在气泡坍塌后运用环状数值模型模拟气泡的非球状回弹,并开发了相应的计算程序,计算结果与精确解吻合很好。运用该文开发的程序计算自由场中环状气泡的运动,计算了流场中滞后流的速度以及压力随时间的变化,并讨论了水深和药量的变化对水下爆炸气泡坍塌形成的射流速度以及气泡脉动周期的影响,得到一些有规律性的曲线,旨在为相关水下爆炸气泡动态特性研究提供参考。

THE EFFECT OF CHARGE AND WATER DEPTH ON THE UNDER WATER EXPLOSION BUBBLE

The fluid field is supposed as irrotational incompressible ideal fluid in the phase of bubble pulsation due to underwater explosion and potential flow theory is adopted to educe the control equation of bubble boundary movement. Based on the bubble dynamic model,the distortion and location of the bubble boundary are obtained by using the boundary integral method. Nonspherical rebound of the bubble is simulated using an annular numerical model after the bubble collapse and the corresponding program is exploited and its calculated results present satisfactory precision with the exact solution. The motion of the annular bubble in free field and after-flow velocity as well as pressure variation along with time are calculated using the program exploited in this paper and the influence of water depth and charge variation on jet velocity induced by underwater explosion bubble collapse and the pulsating period are also discussed, obtaining abundant generalizing curves to present some references to relative research on dynamic behavior of the bubble induced by underwater explosion.