多翼离心风机气动噪声的降噪

Noise Reduction and Test Research of Aerodynamic Noise for Multi-blade Centrifugal Fan

针对多翼离心风机气动噪声的主要噪声源提出降噪方案。首先,对于多翼离心风机涡流噪声的降噪,主要通过优化叶轮、蜗壳的结构几何参数和在叶轮出口加装旋转扩压器等方式进行。其次,对于多翼离心风机旋转噪声的降噪,主要通过改变蜗舌形式进行。最后对优化进出口安装角的叶轮和在叶轮出口加装旋转扩压器这两种降噪措施进行试验验证。结果表明,改进后的风机与原型相比达到显著的降噪效果。

In this paper,some schemes of reducing the aerodynamic noise are proposed for multi-blade centrifugal fans.Firstly,the vortex noise can be reduced mainly through the optimization of the geometric parameters of the impeller and volute and installing a rotation diffuser in the outlet of the impeller.Secondly,the discrete noise can be reduced mainly by changing the form of volute tongue.Finally,the experimental verification is carried out for the two improved fans,one is designed with optimization of inlet and outlet blade angles,and the other is installed a rotation diffuser in the outlet.The tests show that the noise of the improved fans is reduced obviously in comparison with the prototype.