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水下爆炸气泡破坏效应是水中兵器的重要毁伤模式之一。为研究水下爆炸气泡脉动现象,建立了小当量水下爆炸实验系统,并进行了爆炸当量分别为0.125g、1.0g、3.375g和8g TNT的水下爆炸实验。采用球形PETN装药并中心起爆,产生球形对称的气泡和冲击波载荷,并利用高速摄像系统记录水下爆炸气泡脉动过程,以及布置压力传感器测量水中冲击波压力。实验获得了清晰的水下爆炸气泡脉动过程图像,得到了冲击波和气泡脉动压力曲线。对数字化图像进行判读,得到气泡脉动直径和周期。另外根据冲击波曲线测量了气泡脉动周期,对比分析了气泡脉动相关参数。结果表明,高速摄像数据测量的气泡直径与经验公式较接近,高速摄像测量的气泡周期与冲击波曲线测量的气泡脉动周期以及经验公式结果具有较好的一致性。本文提出的实验技术安全、经济、可靠,气泡脉动参数判读精确,满足水下爆炸气泡脉动研究需求。
Underwater explosion bubble destruction effect is one of the important modes of destruction of water weapons. In order to study the phenomenon of underwater explosion bubble pulsation, a small equivalent underwater explosion experiment system was established and underwater explosion experiments were conducted with equivalent explosive weights of 0.125g, 1.0g, 3.375g and 8g TNT respectively. Using spherical PETN charge and center detonation, resulting in spherical symmetrical bubbles and shock wave loads, and the use of high-speed camera system to record the underwater explosion bubble pulsation process, and the deployment of pressure sensors to measure water shock wave pressure. A clear underwater explosion bubble pulsation process image was obtained, and the shock wave and bubble pulsation pressure curve were obtained. Interpreting the digitized image gives the bubble pulsation diameter and period. In addition, the bubble pulsation period was measured according to the shock wave curve, and the related parameters of bubble pulsation were analyzed. The results show that the bubble diameter measured by the high-speed camera data is close to the empirical formula, and the bubble period measured by the high-speed camera is in good agreement with the bubble period and the empirical formula measured by the shock wave curve. The experimental technique proposed in this paper is safe, economical and reliable, and the parameters of bubble pulsation are accurately interpreted to meet the research needs of underwater explosion bubble pulsation.