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.