横流中圆孔湍射流的旋涡结构  

Vortex structures of round turbulent jets in cross-flow

作　　者：李炜[1] 姜国强[2] 张晓元[1] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072 [2]天津大学机械工程学院,天津300072

出　　处：《水科学进展》2003年第5期576-582,共7页Advances in Water Science

基　　金：国家自然科学基金资助项目(59979022)~~

摘　　要：应用PIV流场测试系统,研究不同流速比的横流中圆孔湍射流的旋涡结构。发现主要有4类旋涡,即射流主体周缘剪切层的类开尔文涡列、横流绕流分离旋涡、射流喷口前缘的马蹄涡系和尾迹涡。分析了这些旋涡的形成机理及其拓扑性质,射流近区有两条分离线,一条是横流绕流分离线,另一条是使射流两侧剪切层旋涡进入分离旋涡区的分离线。证实绕流分离旋涡最终在射流的顺流贯穿段进入射流主体,混合形成射流主体内的主反向旋转涡对。The vortex structures of round turbulent jets in cross-flow with different velocity-ratio were investigated by using the PIV. It is found that the vortex structures include the Kelvin-like vortexes in shear-layer of jet, the cross-flow separation vortex pair, the horseshoe vortex system in upstream bottom region of jet and the wake vortexes. Through analysis of evolvement mechanism of vortex structure and topology, the two separation lines in the nearfield of the jets are obtained: one of them is the separation line of the cross-flow and another is the line of shear vortexes around the jet to enter cross-flow separation vortexes. Ultimately, the separation vortex pair enter and mix with the jet at far field to form the counter-rotating vortex pair in the jet body.

关 键 词：横流 圆孔湍射流 旋涡结构 实验装置 湍流 

分 类 号：O357.5[理学—流体力学]