一种水中爆炸气泡脉动实验研究方法

 在2 m×2 m×2 m的实验水箱中开展小当量PETN炸药水中爆炸气泡脉动实验时，利用弹性波从声阻抗高的物质传入声阻抗低的物质时的“减震缓冲”原理，采用在水箱壁贴低声阻抗材料的方法，有效降低了水箱壁反射冲击波对气泡脉动过程的影响，获得了清晰的气泡脉动过程图像、气泡水射流形成过程图像和气泡脉动压力曲线。将水箱实验结果与8 kg TNT当量爆炸水池实验结果对比，得到的最大相对误差仅为5.1%，验证了水箱实验方法的准确性，为炸药水中爆炸气泡脉动现象研究提供了一种简便有效的实验方法。

An Experimental Method of Studying Underwater Explosion Bubble Oscillation

Dynamics of bubble oscillation formed during underwater explosions were studied in a 2 m×2 m×2 m water tank. The theory of shock absorption when elastic wave transmits from high acoustic impedance material to low acoustic impedance material was used. The walls of the water tank were covered with a layer of material having low acoustic impedance. With this set up, the bubble oscillates without influence of the shock waves that reflected from the walls of the water tank. The pressure was measured by piezoelectric pressure transducers, and the explicit pictures of the bubble oscillations and water jet were captured by a digital high speed camera. Another experiment was carried out in an 8 kg test pond to validate the water tank experimental data. The results of the underwater explosion in a water tank are in good agreement with the results getting from the test pond, and the maximal relative deviations between two experimental results is 5.1%. This method is simple and efficient for studying bubble oscillation phenomena.