水中爆炸气泡与水底边界相互作用的水射流现象

Water jet phenomena induced by the interaction between underwater explosion bubbles and water bottom boundaries

应用开尔文冲量原理,分析了水中爆炸产生的气泡与水底边界相互作用产生水射流的主要影响因素,开展了气泡与水平放置的钢板相互作用水射流现象的实验研究工作。通过改变炸药到钢板的距离,得到不同爆距条件下,气泡与钢板相互作用形成水射流的动态过程图像和气泡2次脉动压力。理论分析和实验结果均表明:随着爆距的减小,Bjerknes力迅速增加,气泡与水平放置钢板相互作用产生水射流的临界条件为爆距小于气泡最大半径。水射流具有非常明显的方向性,对目标毁伤作用明显。

The Kelvin impulse principle was applied to analyze the major influence factors in the formation of the water jet by the interaction between an underwater explosion bubble and a water bottom boundary.And a series of experiments were conducted in a water tank to investigate the water jet phenomena induced by the interaction between bubbles and a horizontally placed steel plate.The distance between the explosive and the steel plate was changed with the different experimental conditions.The oscillation pictures of the water jets were captured by a high-speed camera and the pulse pressures of the bubbles were obtained by pressure sensors at the positions with the different distances away from the explosion source.Both the theoretical analysis and the experimental results show that the Bjerknes force increases markedly with the decreasing distance between the explosive and the steel plate,and the critical condition,for the formation of the water jet by the interaction between the bubble and the horizontally placed steel plate,is that the explosion distance is shorter than the maximum bubble radius.And the water jet has a distinct orientation and it can remarkably damage the target.