地铁用轴流风机的CFD模拟及研究

CFD Simulation and Research on Axial Flow Fan in Subway

应用计算流体力学(CFD)软件FLUENT对地铁用轴流风机的压力场和速度场进行模拟,得出风机在不同风量下的全压和效率,与试验结果基本吻合。在同一风量和转速下,叶顶间隙越小,风机的全压和效率越高,且随着风量的增大,叶顶间隙的影响逐渐减小。在同一风量和转速下,改变叶片安装角,风机效率与全压变化方向相反。在风量较小时,叶片数量对风机的性能影响不大,但在风量较大时,叶片数较少的风机全压和效率随着风量的增大急剧下降。

The pressure and velocity fields of axial flow fan used in subway are simulated by computational fluid dynamies（CFD） software FLUENT. The total pressure and effieieney whieh are basically consistent with the experimental results are found under different air rate. Under the same air rate and rotational speed, the smaller the tip clearance, the higher total pressure and efficiency the fan has, and the effect of tip clearance decreased with the increase of air rate. Under the same air rate and rotational speed, the change of installed angle of blades results in the diverse variation trend for the total pressure and efficiency. When the air rate is relatively low, the fan performance is little affected by the number of blades, but when the air rate is relatively high, the total pressure and efficiency of fan with a low number of blades drop dramatically with the increase of air rate.