关键词: 低雷诺数;径向迁移;间隙泄漏流;低能流体

Abstract: By using the advanced transition model, the inflow was simulated for NASA Rotor67 both at high Reynolds number and low Reynolds number. Detailed analysis of the flow visualization exposed the different flow topologies of the complicated secondary flow. It is found that the Rotor 67 is prone to tip stall behavior. The tip section flow field is controlled by two low momentum zones. One is generated by the interaction of the tip leakage flow and incoming flow and the other one is attributed to the suction surface flow separation. When the Reynolds number is reduced, the core leakage flow is weaken. Thereafter,its influence on the tip section flow is reduced. The rear zone of low-energy fluid is dominant in the tip section flow field.Thus,decreasing Reynolds number changes the dominant factor affecting the tip section flow field. 

Key words: Low Reynolds number; Radial movement; Tip leakage flow; Low-energy flow