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.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
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)
