排灌机械工程学报2016，Vol.34Issue(7)：573-578,6.DOI:10.3969/j.issn.1674-8530.15.0255
间隙尺寸对水翼叶顶旋涡空化流动影响的试验研究
Experimental investigation into influence of clearance size on cavitating vortical flows in hydrofoil tip
摘要
Abstract
Cavitating vortical flows in a hydrofoil tip with different tip clearance sizes are studied ex-perimentally .A series of experiments are conducted in a closed-loop cavitation tunnel .The cavities are observed with a high speed camera and are analyzed by using image processing .The cavitating flow de-veloping characters in the different size clearances (0.5 and 2.0 mm) are compared.Based on the re-sults, three typical cavitation stages can be defined with decreasing cavitation number , namely inci-pient cavitation ( I) , attached cavitation ( II) and shear layer cavitation ( III) .In stage I, the stream-wise length of cavity in the big gap is larger than that in the narrow gap .In stage II, the attached cavi-ty inside the large gap develops faster than that in the small gap in both the cavitation inception and the developing phases with decreasing cavitation number .In stage III , the critical cavitation number for the formation of triangular shear layer cavitation in the large gap is higher than that in the small gap;meanwhile , the cavity extends further downstream in the large gap than that in the small gap as well .关键词
水翼/叶顶间隙涡/空化/间隙尺寸/高速摄像Key words
hydrofoid/tip leakage vortex/cavitation/tip clearance size/high speed camera分类
农业工程引用本文复制引用
刘雷鸣,刘影,赵宇,王国玉..间隙尺寸对水翼叶顶旋涡空化流动影响的试验研究[J].排灌机械工程学报,2016,34(7):573-578,6.基金项目
国家自然科学基金重点资助项目（51239005）；国家自然科学基金资助项目 （）
