Effects of a Kind of Non-smooth Blade on the Unsteady Flow Field at the Exit of an Axial Fan  

作　　者：Hongwei MA Jibo GUO 

机构地区：[1]School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China [2]National Key Laboratory on Aero-Engines, Beijing, 100083, China

出　　处：《Journal of Thermal Science》2008年第1期1-6,共6页热科学学报（英文版）

基　　金：National Natural Science Foundation of China,Grant No.50376002;the 111 Project,No.B07009

摘　　要：An experimental investigation of effects of a kind of streamwise-grooved blade on the unsteady flow field at an exit of an axial-flow fan was performed. The flow field at 25% chord downstream from the trailing edge at hub was measured using a fast-response five-hole pressure probe at different mass-flow conditions. The unsteady flow of the grooved blades was compared with that of the smooth blades. The measurement results indicate that： （1） the grooved blades restrain the velocity fluctuation and the pressure fluctuation by modulating the blade boundary layers, which contributes to the flow loss reduction in the hub region and in the rotor wake region at the design condition; （2） the stream-wise grooves play an important role in restraining the radial migration in the blade boundary layer and abating the tip flow mixing, which contributes to the flow loss reduction in the tip region at the design condition; （3） at the near stall condition, the grooved surface can not reduce the flow loss, even increase the loss nearby when the separation happens in the blade boundary layer.

关 键 词：axial fan non-smooth blade stream-wise groove unsteady flow. 

分 类 号：TG1[金属学及工艺—金属学]