激光空蚀机理的实验研究  

Mechanism of Cavitation Erosion by Laser-generated Bubble near a Solid Boundary

作　　者：赵瑞[1] 徐荣青[2] 沈中华[1] 陆建[1] 倪晓武[1] 

机构地区：[1]南京理工大学应用物理系,江苏南京210094 [2]江苏科技大学电子信息学院,江苏镇江212003

出　　处：《光电子．激光》2007年第9期1120-1123,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60578015;60208004);江苏省自然科学基金资助项目(05KTB510028);教育部高校优秀青年教师奖励计划和博士点基金资助项目(20050288025)

摘　　要：采用自行研制的力学传感器,研究了激光等离子体空泡溃灭对固壁的空蚀破坏机理。结果表明:空泡溃灭产生的射流和高压脉冲对空蚀形成起主导作用;高压脉冲和射流对固壁的空蚀破坏效果取决于反映空泡泡心与固壁间距离的无量纲参数γ,并给出了距离界限;这两种作用机制在空蚀过程中存在着此消彼长、相互竞争。In order to elucidate the mechanism of cavitation erosion, the dynamics of a single laser-generated cavitation bubble in water is investigated in detail. Employing a new force sensor, the characteristics of bubble dynamics,in particular the formarion of a high-speed liquid jet and the emission of acoustic transient are experimentally measured. The experimental results indicate that acoustic transient emission and liquid jet are both predominant features on the cavitation erosion,and the diemnsionless 7 is the decisive factor.

关 键 词：空蚀 射流 高压脉冲 力学传感器 激光 

分 类 号：O434.14[机械工程—光学工程]