叶片的周向前弯角度对低压轴流风扇叶顶泄漏流场的影响  

Influence of the Circumferential Forward Skew Angle of Blades on the Blade Tip Leakage Flow Field of a Low-pressure Axial Flow Fan

作　　者：李杨[1] 卢纪富[2] 

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061 [2]郑州大学化学工程学院,河南郑州450001

出　　处：《热能动力工程》2009年第3期286-290,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：基于4个具有不同周向前弯角度叶片(前弯1.27°,6.1°,8.3°,12°)的低压轴流风扇,对叶顶泄漏流场进行了实验和数值模拟。利用雷诺平均N-S方程组加S-A一方程湍流模型对叶轮在稳定工况点处进行了三维粘性流场的数值计算,分析了叶顶处叶片表面压力的轴向分布,计算结果表明:随着叶片周向前弯角度的增加,叶顶泄漏涡的初始位置逐渐向叶片后缘移动。利用粒子图像测速仪(PIV)系统对叶轮的叶顶泄漏流场进行了实验测量,清晰地展示叶顶泄漏涡的发展过程,结果显示:随着叶片周向前弯角度的增加,叶顶泄漏涡的轴向位移"先减小后增大",周向位移"先增大后减小"。An experimental and numerical study was performed of a low-pressure axial flow fan installed with blades of four different circumferential forward skew angles (1.27,6.1,8.3 and 12 degrees).By utilizing Reynolds Number averaged Navier-Stokes (N-S) equation group and a turbulent flow model of Spalart-Allmaras (S-A) No.1 equation,a numerical calculation was conducted of the three-dimensional viscous flow field of the impeller at steady operation points.Under the precondition of the numerical calculation results being identical with the measured ones,analyzed was the axial distribution of blade surface pressures at the blade tip.The calculation results show that with an increase of the circumferential forward skew angle of the blades,the initial location of the blade tip leakage vortex will gradually shift toward the blade trailing edge.By employing a particle image velocimetry (PIV) system,the blade tip leakage flow field of the impeller was tested and measured,explicitly showing the evolution of the blade tip leakage vortex.It has been found that with an increase of the circumferential forward skew angle of the blades,the stability of the blade tip leakage vortex will 'first become greater and then weaker' ,the axial displacement of the vortex in question will 'first decrease and then increase' while its circumferential displacement will 'first increase and then decrease'.

关 键 词：轴流风扇 周向前弯叶片 叶顶泄漏流动 粒子图像测速仪 

分 类 号：TH432.1[机械工程—机械制造及自动化]