摘要
为分析空泡在壁面附近溃灭导致的冲击波和射流特性,提出将激光空化、高速摄影技术应用于激光空泡的空蚀研究。建立了壁面附近激光空泡的产生、微调控制及高速摄影测量实验平台。采用高速摄影技术对不同液体、不同γ参量条件下空泡脉动的外形特征、溃灭冲击波和溃灭射流等参量进行了测量。结果表明,壁面的存在弱化了空泡溃灭时的收缩程度,空泡溃灭时的冲击波和射流对壁面的破坏作用存在着此消彼长,相互竞争的关系;空泡在壁面附近脉动时,回弹泡的溃灭对壁面也可产生较强的破坏作用;液体的粘性增大有助于空泡表面维持稳定,减缓空泡溃灭时泡壁的运动速度。
The investigation of laser bubble erosion through laser cavitation and high speed photographic to analyze the integration characteristic of bubble collapse is presented.The apparatus of laser bubble erosion measurement in the vicinity of a solid boundary is designed based on the laser cavitation.The laser bubble characteristics,such as collapse shock wave,rack of bubble wall and cavitation jet are measured based on the high-speed photography tiny adjustable machine,and the non-dimensional parameterγis analysed.The results show the rigid boundary can delay the bubble collapse,and the actions of bubble shock wave and cavitation jet are competitive.The destructive effect of the second bubble collapse is stronger when bubble impulsion is near a solid boundary.The accretion of liquid viscidity can delay the bubble collapse,and the movement velocity of bubble skin is slowed down.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第3期885-892,共8页
Acta Optica Sinica
基金
国防基金(9140A14060207JB11)资助课题
关键词
激光物理
激光空化
空泡空蚀
高速摄像
冲击波
射流
laser physics
laser cavitation
bubble erosion
high-speed photography
shock wave
cavitation jet
