动水环境中有限宽窄缝湍射流的水力特性研究  

Study on vertical turbulent slot jet impinging into cross flow

作　　者：姜国强[1] 李炜[2] 陶建华[1] 

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

出　　处：《水利学报》2004年第12期51-55,61,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(59979022)

摘　　要：本文采用粒子图像测速(PIV)系统,在分析了水中粒子跟随性的基础上,对动水环境中多种喷口长度和流速比情况下的有限宽窄缝湍射流近区流场进行测试,并结合数值模拟结果分析讨论了动水环境中有限宽窄缝湍射流的近场三维流动特性。在实验观测的流速比范围内,射流势流核长度随着流速比的增加而增大并逐渐趋近于平面自由湍射流的势流核长度,雷诺数对射流的发展轨迹影响很小,射流发展主要由流速比控制。同时,给出了射流背流面逆流区长度与流速比、喷口形状因子之间的关系。The flow characteristics of slot impinging jets with finite width and different velocity ratio (ratio of impinging velocity to cross flow velocity) are studied experimentally by means of PIV technique. Numerical simulation is also carried out to help further analyze the 3-D flow characteristics in the near-field. It is found that the potential core of the jet increases with the increase of the velocity ratio and tends to the same as the length of plane free turbulent jet. The Reynolds number will not remarkably affect the jet trajectory. The jet trajectory is mainly controlled by the velocity ratio. The relationship between extent of reverse flow and velocity ratio as well as the relationship between extent of reverse flow and geometric parameters of the slot are also investigated.

关 键 词：有限宽窄缝湍射流 近场特性 横流 几何参数 

分 类 号：TV137[水利工程—水力学及河流动力学]