对旋轴流风机叶顶间隙对其性能的影响

为了探究改变对旋轴流风机两级叶轮的叶顶间隙对其性能的影响,建立不同叶顶间隙下风机三维模型,利用Fluent进行数值模拟,并结合风机性能试验验证仿真的正确性。分析压升、效率、轴功率、湍流动能和叶顶泄漏涡随两级叶轮叶顶间隙的变化情况,结果表明:在相同流量下,压升、效率随间隙的增大而减小;与第一级叶轮相比,间隙对第二级叶轮的轴功率、湍流动能及泄漏涡影响更加显著;随间隙增大,叶顶泄漏涡的强度和影响区域越大。

Impact of Blade Tip Clearance on Performance of Counter-rotating Axial Fan

In order to investigate influence of different blade tip clearances on counter-rotating axial fan performance, we establish three-dimensional models with different tip clearances. Then numerical simulation is performed by Fluent. And the correctness of the simulation is verified by performance test of fan. Finally, we analyze the changes of pressure rise, efficiency, shaft power, turbulent flow energy and tip leakage vortex with tip clearance of two-stage impeller. The results show that under the same flow rate, the pressure rise and the efficiency decrease with the increase of the clearance. Compared with the first stage impeller, the clearance has a more significant effect on the shaft power, turbulent flow energy and leakage vortex of the second stage impeller. The tip leakage vortexs intensity and influence area increase with the increase of the clearance.