摘要
格尼襟翼是一种低速流动翼型的增升装置.本文通过数值方法分析了低压轴流风扇在设计工况点的气动性能和内部流动结构,研究了格尼襟翼在旋转叶片上的气动作用.结果表明:叶片尾缘襟翼增加了叶片尾流的涡强度,提高了叶片的气动负荷,推迟了吸力面分离位置,叶轮出口的相对气流落后角减小,风扇总压升得到提高.但是叶尖泄漏流强度有所增加,效率有一定程度的降低.切除叶片端部30%叶高的部分格尼襟翼后,减少了风扇叶顶间隙泄漏涡的强度和范围,二次流损失降低,风扇压升和效率均得以改进.
Gurney flap is a one lift-enhancement device for low speed flow airfoils.This paper intends to study its aerodynamic effects on the performance of a rotating fan through numerical flow analysis. Results show that Gurney flap installed at the blade trailing edge increases the airfoil loading because of the increased airfoil downwash vorticity.The flow separation on the suction surface of smooth blade is delayed and moved further downstream.The deviation of exit flow angle is reduced.The total pressure of the fan increases but the efficiency decreases due to increased tip leakage flow.After removing the top 30% height Gurney flaps,the strength and occupation of tip vortex leakage vortex are decreased and the secondary loss is reduced.The pressure and efficiency of the fan get improved.
作者
谢海军
陈榴
陆泽帆
戴韧
XIE Hai-Jun;CHEN Liu;LU Ze-Fan;DAI Ren(University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第12期2692-2697,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51276116)
关键词
轴流风扇
格尼襟翼
压升
叶顶间隙泄漏
axial fan
Gurney flap
pressure rise
tip clearance leakage
