前掠角对车用轴流式冷却风扇性能的影响

建立了某车用冷却风扇不同前掠角参数化模型，并基于计算流体力学的方法对其流动进行了仿真，研究了不同风扇转速下，前掠角对冷却风扇流动、风量以及阻力矩的影响.在压力分布方面，研究结果表明:随着冷却风扇前掠角的增加，相同的转速下，风扇叶栅入口处，空气的平均压力不断升高，叶栅流道内，相邻叶片间升力面和吸力面间的压力梯度逐渐减小，同一叶片升力面同吸力面间的压差逐渐降低.在速度分布方面，随着前掠角的增加，相同的转速下，风扇叶栅入口处，空气的流速逐渐减小，叶栅流道内，空气速度的增加逐渐减小.在风扇性能方面，随着前掠角的增加，相同的转速下，风扇风量逐渐减小，风扇阻力矩逐渐降低.

Effect of Forward-Swept Angles on Performance of Axial Cooling Fans for Vehicles

The parameter models of forward-swept angles of cooling fans for vehicles were established. Their flow fields were simulated by using computational fluid mechanics method， and the effect of forward-swept angles on the flow field， volume flow rate and resistance torque of cooling fans was researched. In terms of pressure distribution， the results showed that at the same ration speed， the average air pressure at the inlet of cascade increases with the forward-swept angle and both the gradient and the pressure difference between blade lift-surface and blade suction surface falls with the forward-swept angle. In terms of velocity distribution， at the same rotation speed of cooling fans， the air velocity at the inlet of cascade decreases and the rise in the air velocity goes down with the forward-swept angle. In terms of the performance of cooling fans， at the same rotation speed， both fan volume flow rate and fan resistance torque reduce with the forward-swept angle.