离心风机蜗舌噪声机理及控制方法

The Cause and Control of the Noise Made by Snail Tougue of the Centrifugal Fan

风机噪声严重影响了环境，经过对离心风机的气动特性分析可知：离心风机的蜗舌处是主要噪声源，用λ1／4共振器可有效地降低风机噪声。传统方法是将共振器频率设计成共振频率，实际上，这样效果并不是最佳的，所以，必须注意λ1／4共振器频率选择问题。

The noise made by fans influences the environment seriously. By analysing its pneumatic specificity feature, we find that the main source of the noise is the snail tongue of the centrifugal fan, and with λ1 /4 resonators,we can reduce the noise effectively. The traditional way is to make the frequency of the resonator be the resonant frequency, but the result is not the best. Therefore, the choice of resonators is the most important.