绕水翼初生空化涡的实验观测  

EXPERIMENTAL OBSERVATIONS OF INCEPTION CAVITATION VORTICES AROUND A HYDROFOILS

作　　者：张敏弟[1] 王国玉[1] 鲁君瑞[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《力学学报》2006年第4期547-552,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(50276004)北京理工大学基础研究基金(BIT-UBF-200503E4206)资助项目.~~

摘　　要：对绕2D水翼无分离流边界层内的初生空化形态进行了实验研究．采用高速摄像机观测了空化初生结构的形态,应用2D—LDV测量了空化初生时翼型周围的流动速度分布,并对实验结果进行了分析．结果表明: 绕水翼无分离边界层内,初生空化结构中空泡伴随着近壁湍流拟序结构的发生而出现,在初生空化条件下,形成空化涡结构,大量的微空泡产生于发夹涡结构中,并在涡结构的猝发过程中出现生成-长大-溃灭-反弹-再溃灭的过程．初生空化涡结构具有空泡和近壁拟序结构双重特性．The inception cavitation around a 2D-hydrofoil in the boundary layer of a non-separated turbulent flow was studied experimentally. The cavitation inceptions were observed by a high speed video camera, and the velocities around the hydrofoil were measured by a 2D-LDV. It is shown that the inception cavitation bubbles are generated along with a hairpin-shaped vortex coherent structure in the boundary layer of the non-separated turbulent flow. The developing process of an inception cavitation bubble vortice comprises generation, expanding, collapse, rebound and re-collapse. It is concluded that the inception cavitation has dual characteristics of both bubbles and coherent structures.

关 键 词：水翼 空化初生 拟序结构 2D—LDV 空化涡 

分 类 号：TV131.2[水利工程—水力学及河流动力学]