摘要
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。
Bubble demolition effect induced by underwater explosion loads is one of the most important lethality of naval weapons.In order to study bubble pulsation of undwater explosion,a set of small scaled experimental system was establised,a series of underwater explosion（Explosion equivalent is 0.125g,1.0g,3.375g and 8.0g TNT,respectively） tests were carried out in water tank.Spherical PETN chargers were adopted and center ignition was used to produce spherical symmetrical bubble and shock waves.High-speed camera system was used to capture the bubble impulsation and pressure gauges were mounted to measure the pressure of shock waves.Clear images of underwater explosion bubble pulsation and pressure curves of shock waves and bubble pulsation were obtained.Bubble diameter and its pulsation period were analyzed,baesd on the interpretation of digital images recorded by high-speed camera system.Otherwise,bubble pulsation period was measured from shock wave curves,bubble pulsation related parameters were compared ans analyzed.Results show that the bubble diameter measured from digital images are close to empirical formula.Results also show that the bubble pulsation period measured from digital images is in agreement with that measured from shock wave curves and that calculated by empirical formula.So the experimental technique presented in this paper is safe,economical and reliable.The measured parameters of bubble pulsation are accurate and useful for studying underwater explosion bubble pulsation.
出处
《实验力学》
CSCD
北大核心
2011年第1期67-72,共6页
Journal of Experimental Mechanics
关键词
水下爆炸
气泡脉动
高速摄像系统
underwater explosion
bubble pulsation
high-speed camera system
