有无叶顶间隙条件下斜流风机叶轮内部三维流动的数值研究  

Numerical Study of 3-D Flow in a Diagonal Fan Impeller

作　　者：赖焕新[1] 康顺[1] 谭春青[1] 吴克启[2] 

机构地区：[1]中国科学院工程热物理研究所,北京100080 [2]华中理工大学动力工程系,湖北武汉430074

出　　处：《航空动力学报》2000年第1期17-21,共5页Journal of Aerospace Power

基　　金：国家自然科学基金!资助项目(59876042)

摘　　要：本文使用NUMECA 的商业软件Fine/Turbo,对一种斜流风机叶轮在有无叶顶间隙条件下的三维粘性流场进行数值研究。在与测量数据比较的基础上,对两种流场的极限流线和二次流图谱及速度分布等进行了分析。揭示了流道中低速流体的输运,“射流—尾迹”流型和叶顶间隙泄漏涡等的形成过程。研究结果表明:二次流和涡运动导致叶道出口流动尾迹发生于外端壁/压力面角域;The NUMECA software Fine/Turbo is employed to investigate the three dimensional viscous flow in a diagonal fan impeller at the operating conditions with and without blade tip clearance respectively.The limiting streamlines,secondary flow patterns and velocity distributions of the two flow fields are analyzed by comparison between their numerical and experimental results.The transportation of low energy fluid in the flow passage,'jet/wake' structure and the formation of tip leakage vortex are revealed.The results show that the non-uniform flow wake induced by secondary motion and vortex always appear in the corner region of casing wall and pressure surface;and the effects of the tip clearance are to reduce the efficiency of the impeller and to enlarge the non-uniform level of the outflow field in the impeller.

关 键 词：斜流风机叶轮 间隙 数值模拟 流场 三维粘性流动 

分 类 号：O357[理学—流体力学] TH432[理学—力学]