周向前弯轴流风扇转子叶顶泄漏流动研究  

Research Findings Concerning Bladetip Leaking Flow in Circumferential Forward-skewed Axial-flow Fan Rotors

作　　者：李杨[1] 欧阳华[1] 杜朝辉[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030

出　　处：《热能动力工程》2007年第1期75-79,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：以低压轴流风扇3个代表性的周向前弯角(前弯1.27°、8.3°和25°)的叶轮作为研究对象,对三维粘性流场进行了数值计算,并对出口损失进行了试验测量,计算与测量结果能够较好地吻合。结果显示,叶顶泄漏涡的起始位置随着叶片周向前弯角度的增加而沿叶弦后移,逐渐接近叶片后缘,但旋涡的强度并不是一直增大,达到某一前弯角度以后,泄漏涡由于受到叶片尾迹的影响而减弱。由此反映出,较大的前弯角度的叶轮,叶顶区域流动变得更加复杂,同时对上端部损失的影响因素增多,包括了泄漏涡、二次涡、尾迹以及它们之间的相互掺混。With a blade wheel of a low-pressure axial flow fan having three typical circumferential forward-skewed angles(forward-skewed angles of 1.27,8.3 and 25 degrees) serving as an object of study,a numerical calculation was conducted of a three-dimensional viscous flow field along with a testing and measurement of the outlet loss.The calculation results are in comparatively good agreement with the measured ones.The results show that with an increase in the circumferential forward-skewed angle of blades,the starting location of the blade-tip leaking vortex will shift backward along the blade chord,gradually approaching the trailing edge of the blades.The vortex intensity will not increase all along but show a sign of weakening as influenced by the blade wake after a certain forward-skewed angle has been reached.The foregoing reflects that for a wheel with a big forward-skewed angle,the flow in the blade-tip area becomes more complicated,and meanwhile the factors influencing the top-end loss will multiply,including leaking vortex,secondary vortex,wake,and mutual mingling and dilution.

关 键 词：低压轴流风扇 周向前弯 叶顶泄漏流 尾迹 

分 类 号：TH432.1[机械工程—机械制造及自动化]