一种离心风机蜗壳减振降噪的数值优化方法

Numerical Optimization on Vibration and Noise Reduction of Centrifugal Fan Volute

针对离心风机蜗壳提出了一种减振降噪的数值优化设计方法.该方法以蜗壳结构振动最小为目标进行优化,这样只需对结构振动优化的最终结果进行声场计算.利用ANSYS软件对风机蜗壳进行参数化建模,选择蜗壳壁面节点振动速度的平方和作为目标函数对蜗壳壁厚进行优化设计,数值优化结果表明,所提方法可以达到减少蜗壳结构振动的目的.针对优化前后的蜗壳结构,利用直接边界元法对蜗壳振动辐射噪声进行了计算,得出优化后蜗壳振动的辐射声功率有较大幅度的降低,可为离心压缩机及进出口均连接管道系统的离心风机的降噪研究提供有益的参考.

A numerical optimization was presented to reduce vibration and noise of a centrifugal fan volute.Minimum vibration was regarded as the aim of the optimization,and the sound field calculation for the structural vibration was performed with the final results of the optimization.Parametric modeling was done for the volute by the ANSYS software,and the optimum design of the volute was carried out using the volute local thickness as the design variable and the quadratic sum of the nodal velocity as the objective function.The numerical optimization results show that the present design method can reduce the volute vibration.Radiated noise of the volute before and after the optimization was calculated by the direct BEM,respectively.The results show that the radiated power of the volute vibration will decrease significantly after the optimization.