针状突体空化结构的高速摄影观察  

High speed photographic observations of cavitation structures behind a needle-like protrusion

作　　者：董志勇[1] 张旭[1] 朱芳[1] 李晓鹏[1] 

机构地区：[1]浙江工业大学水利与市政工程研究所,浙江杭州310014

出　　处：《水利学报》2009年第11期1363-1368,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(50879078)

摘　　要：应用高速摄影技术在直流式水洞中对针状突体的空化结构进行了试验研究。试验流速为8~40m/s,高速摄影机拍摄速率为20000fps,曝光时间为4μs。观察了不同流速下针状突体后空化云的形态以及随流动的演变情况,及不同掺气量对空化云的影响。此外,还给出针状突体空化区包络线(自由流线)的表达式。Cavitation structures behind a needle-like protrusion were preliminarily investigated by high speed photography in a water tunnel.Flow velocity 8～40m/s,frame rate 20000fps and exposure duration 4μs were taken in the experiment.Patterns of cavitation clouds behind the needle-like protrusion and their variations with flow were observed under different flow velocities.The effect of different air flow rates on cavitation clouds were considered.In addition, an expression of enveloping curve(free streamline) due ...

关 键 词：针状突体 空化结构 高速摄影技术 掺气 

分 类 号：TV131.3[水利工程—水力学及河流动力学]