基于水下脉冲放电的冲击波聚焦实验研究  

Experimental study of the focusing property of underwater pulsed discharge shock wave

作　　者：张振福[1] 曾新吾[2] 王一博[2] 蔡清裕[2] 

机构地区：[1]国防科技大学理学院,湖南长沙410073 [2]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2012年第4期54-57,共4页Journal of National University of Defense Technology

基　　金：国家部委资助项目

摘　　要：冲击波的聚焦可以在聚焦区域形成局部较高的压力。基于能产生较强冲击波的水中脉冲放电声源和具有会聚作用的旋转椭球面反射罩建立了水下冲击波聚焦系统,开展了水下冲击波聚焦的实验研究,分析了水下冲击波的聚焦过程。对压力历史、轴线上的压力分布及峰值压力进行了分析,研究了旋转椭球面反射罩的聚焦特性。实验发现聚焦区域会产生负压,并导致局部空化。基于冲击动力学理论对这一现象进行了分析。实验结果表明,水下冲击波聚焦系统具有显著的聚焦效果。Shock wave focusing can produce higher pressure in the focal region. An underwater shock wave focusing system was set up based on the pulsed discharge in water and the focusing characteristics of ellipsoidal reflector. The focusing of shock wave was studied experimentally; the focusing process of shock wave was analyzed. The pressure-time history and the peak pressure along the axial position were presented, the distributing characteristics of the focusing shock wave were revealed. Negative pressure and cavitation phenomenon was induced by shock wave focusing, and the phenomenon was analyzed based on shock dynamic theory. The experimental results indicate that the focusing effect of the ellipsoidal reflector is remarkable.

关 键 词：冲击波聚焦 实验研究 椭球面反射罩 负压 

分 类 号：O382.1[理学—流体力学]