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采用激光技术聚焦击穿液体产生空泡,利用高速摄像系统开展激光空泡与自由液面的相互作用的实验研究。实验研究发现,空泡与自由液面之间的无量纲距离对水下空泡的脉动特性和自由液面的水冢现象存在影响。通过大量实验总结了无量纲距离与空泡半径、空泡脉动周期、自由液面水柱的最大高度和产生水冢时间的相互关系。实验表明无量纲距离越小,空泡脉动周期越短,自由面的水冢现象越明显。同时统计出了在不同无量纲距离范围内所出现的5种不同水冢现象的规律。研究内容为空泡与自由液面相互作用的理论提供了实验依据。
The laser technique is used to focus the breakdown liquid to produce the cavitation, and the experimental research on the interaction between the laser cavitation and the free surface is carried out by using the high-speed camera system. Experimental studies have found that the non-dimensional distance between the bubble and the free surface has an impact on the pulsation characteristics of the cavitation bubble and the water level in the free surface. Through a large number of experiments, the relationship between the dimensionless distance and the radius of the cavity, the period of the bubble cycle, the maximum height of the free surface water column and the time of producing the mound was summarized. Experiments show that the smaller the dimensionless distance, the shorter the cycle of the vacuolar bubble, the more obvious the phenomenon of water mound on the free surface. At the same time, the law of five different water mounds appeared in the range of different dimensionless distances was calculated. The research content provides the experimental basis for the theory of the interaction between cavitation and free surface.