非光滑叶片对轴流风扇气动性能的影响

在低速轴流风扇实验台上,通过对比测量光滑转子叶片、两种表面具有流向沟槽的非光滑转子叶片风扇的气动性能,研究了叶片沟槽面对风扇气动性能的影响.结果表明:(1)在设计状态和小流量状态,采用微槽型非光滑叶片能提高该风扇的流量、降低总压损失和提高风扇总压升;(2)在近失速状态,非光滑叶片使风扇性能下降;(3)非光滑叶片对风扇性能的影响在很大程度上取决于非光滑叶片的沟槽尺寸.

EFFECTS OF NON-SMOOTH BLADE ON THE AERODYNAMIC PERFORMANCE OF AN AXIAL FAN

An experimental investigation of effects of two kinds of streamwise-grooved blades on the performance of an axial-flow fan was performed on an axial fan test rig.The flow field at 25% chord downstream from the trailing edge at hub was measured using a mini 5-hole pressure probe at different mass-flow conditions.The fan performance of the grooved blades was compared with that of the smooth blades.The measurement results indicate that:(1) the grooved blade-surfaces increase the fan's mass flow,reduce the relative total pressure loss and increase the fan's total pressure rise at the test mass-flow conditions except the near stall condition;(2) Negative benefits were obtained at the near stall condition when the smooth blades are replaced by the non-smooth ones;(3) Effects of non-smooth blades depend on the groove geometry to a certain extent.