A Method of Studying Bubble Pulses in a Confined Water Area

Dynamics of bubble pulses generated by PETN charge underwater explosions were studied in a 2m×2m×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 48m in diameter and 23m 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.