基于多部件耦合的空调器轴流风扇叶尖涡研究

Study of the Tip Vortex in Axial Flow Fan for Air-Conditioner Outdoor Set Including the Set Components

本文采用三维Navier-Stokes方程、k-ε方程湍流模型和SIMPLE算法,对基于多部件耦合的空调器轴流风扇叶尖涡的三维流动特性进行了数值分析。结果表明:叶尖涡发生于叶顶吸力面附近距离叶顶弦长28%左右的位置,沿着与叶轮旋向相反的圆周方向,向相邻叶片的压力面发展,并且在距离叶片叶顶弦长45.5%的位置开始耗散,最后消失在风扇出口导流罩边壁的压力面附近。

We simulated the three-dimensional flow characteristics of the tip vortex of axial flow fans used in air-conditioner outdoor set including in the model all the set components（motor, exchanger...）.The numerical model solves the three-dimensional Reynolds-Averaged Navier-Stokes equations together with the RNG k-εturbulent model and the SIMPLE algorithm.The results have disclosed that the tip vortex was formed near the blade tip suction side at about 28%of the chord length down stream the leading edge.The tip vortex developed towards the pressure surface of the adjacent blade along the circumferential direction opposite to the blade rotation;its dissipation occurred at about 45.5%of the chord down stream the leading edge and finally disappeared near the pressure surface of the air guide shroud at the rotor exit.