吸力面带凹窝轴流风扇内流分析与实验研究

NUMERICAL ANALYSIS AND EXPERIMENTAL RESEARCH ON THE INTERNAL FLOW CHARACTERISTIC OF AXIAL FLOW FANS WITH DIMPLES ON SUCTION SURFACE OF BLADES

本文采用Navier-stokes方程和κ-ε两方程模型分别对空调用轴流风轮叶片吸力面设置凹窝和不设置凹窝的的内流特性进行了三维数值模拟,同时对两者的风量噪音特性进行了实验研究。结果表明,在叶片吸力面设置凹窝没有改善风轮的整体流量—压力特性,不能提高风扇的静压升,凹窝只能提高凹窝局部位置的静压升,且凹窝中心压力大,凹窝边缘压力低。小流量时,风扇吸力面设置凹窝反而增加风机噪音,大流量时,凹窝对风机的噪音没有影响。

A numerical analysis and experimental research have been designed to study the internal flow characteristic of two axial flow fans. The researched fans were used in air conditioner out door unit. Both fans have the same outside diameter and nearly the same blade profile. The difference between the studied fans was only on the suction sides of blades; the dimples were carving on the suction sides of blades of one fan. Numerical simulation was based on Navier-Stokes equations coupled with k- ε turbulence model. Numerical results showed that, the aerodynamic characteristic and static pressure of the fan was not improved by carving dimples on the suction sides of blades. The local static pressure of the dimple position was improved, and the static pressure at the center of the dimples was higher than that of the boundary of dimples. The dimples on the suction sides of blades increased the noise of lower volume flow rate condition, and it had no influence to the aerodynamic noise of large volume flow rate condition.