有限水域气泡脉动实验方法研究

A Method of Studying Bubble Pulses in a Confined Water Area

在2m×2m×2m的实验水箱中开展了小当量PETN水下爆炸气泡脉动实验,采用在水箱壁粘贴吸能材料的方法,有效降低了水箱壁反射冲击波对气泡脉动过程的影响,用压电压力传感器和数字式高速相机获得清晰的气泡脉动过程图像和气泡脉动压力。为了验证实验结果,进行8 kg爆炸水池(直径48m,深23m)相同当量水下爆炸实验,并与水箱和水池的实验结果进行了对比,两者最大误差为4.8%。可以认为,在此水箱中开展5 g以内PETN炸药水下爆炸是可行的,实验结果与无限水域实验结果一致,表明本研究提出的炸药水中爆炸气泡脉动现象的方法是简便和有效的。

Dynamics of bubble pulses generated by PETN charge underwater explosions were studied in a 2 m× 2 m × 2m water tank. The wall of the water tank were equipped with a layer of material which can absorb shock waves. With this method, the bubble pulse did not influenced by shock waves reflected from the wall of water tank. The pressure and the explicit picture of bubbles were captured by piezoelectric pressure transducers and a digital high speed camera. To validate the experimental data, another experiment was carried out in a 8kg test pound of 48 m in diameter and 23 m in depth with the same PETN charge. The experiment data of bubble pulse from the water tank were compared with the water pound results. The maximal difference of the two experiment results is 4.8%. It can be considered that the result of underwater explosion in a water tank can be regarded as the result obtained from test pound. The method of studying bubble pulse presented in this paper is simple and efficient.