Cavitation erosion by laser-generated bubble near rigid boundary
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摘要: 采用脉冲激光聚焦于透明液体中产生单个激光空泡，利用高速相机拍摄空泡在透明液体中整个运动过程，并对刚性壁面造成的空蚀现象进行了观测。实验研究发现,空泡溃灭将产生高速冲击波和高速射流，这是造成刚性壁面损伤的两种主要原因。空泡与刚性壁面的无量纲距离在0.4~1.4之间时，刚性壁面首先受到高速冲击波的破坏，由于空泡的趋壁效应，空泡在第二次收缩过程中将在壁面附近对实验靶材产生高速微射流的空蚀破坏。且这两种作用机制在无量纲距离为1.0时，高速微射流对壁面的空蚀效果更加明显。Abstract: The character and micro-process of cavitation erosion by laser-generated bubble near a rigid boundary in water have been studied with high speed camera system. The experimental results indicate that the main reasons for the boundarys erosion are the bubble collapse-generated shock wave and high speed liquid jet. When the dimensionless quantity, the ratio of the distance from the bubble to the boundary to the maximum radius of the bubble, is from 0.4 to 1.4, the first erosion to the boundary is from the shock wave and the second is from the high speed liquid jet because of the bubbles movement to the surface. When the dimensionless quantity is 1, the liquid jet is the decisive factor of erosion.
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Key words:
- laser-generated bubble /
- rigid boundary /
- shock wave /
- liquid jet
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