空化区圆柱突体空化特性的研究  

Study of cavitation characteristics behind cylindrical irregularity in cavitation region

作　　者：郭志萍[1,2] 董志勇[2] 

机构地区：[1]山西水利职业技术学院,山西运城044004 [2]浙江工业大学水利与市政工程研究所,杭州310014

出　　处：《水力发电学报》2013年第4期143-147,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(50879078);浙江省重点科技创新团队计划(2010R50035);浙江省重点实验室开放课题(FZ1101)

摘　　要：通过空泡与空泡运动方程的研究,建立了水流空化区能量守恒方程,理论上对两种不同流速下圆柱突体诱导的空化区中空化特性进行了数值分析。试验在直流式水洞中进行,圆柱突体高为5mm,底部直径为6mm,掺气孔径为5mm。结果表明:同一流速下空泡半径随着掺气浓度的增加而减小;流速越高,掺气浓度越大,空泡半径越小。同一流速下空化数随掺气浓度的增加而增大;低流速下空化数最大值远大于高流速下空化数最大值,试验数据与理论吻合较好。This paper develops an equation of energy conservation for cavitation flow region based on the equations of cavitation bubble and bubble motion. For the cavitation region behind cylindrical irregularity, numerical simulations are presented to demonstrate the effects of cavitation under two different flow velocities. An experiment was conducted in an open-loop water tunnel to test a cylindrical irregularity of 5mm high and 6mm in bottom diameter under the condition of flow aeration by an aeration hole of 5mm in diameter. The results indicate that bubble radius gradually decreases with increase of air concentration at a fixed flow velocity while it becomes smaller if air concentration is higher at the higher flow velocity. Cavitation number for a fixed velocity increases with air concentration, and the peak cavitation numbe.r at the lower velocity is larger than that at the higher velocity. The experimental and numerical results agree very well.

关 键 词：水力学 空化数 掺气浓度 空化特性 

分 类 号：TV131.3[水利工程—水力学及河流动力学]