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分析了离心风机紊流次声形成的机制，探讨了利用叶轮网罩整流来抑制紊流次声的原理和方法，推导了离心风机紊流诱发的次声模型．通过对叶轮装网罩后叶轮叶道内气动特性的分析，给出了装网罩后叶轮紊流次声辐射功率、叶片尾缘涡流脱落次声辐射功率及网罩次声降噪量的数学模型，并以某窗式空调器离心风机为例进行了次声测试与理论计算，结果表明，理论与实际是相符的．
The formation mechanism of centrifugal fan turbulence was analyzed. The principle and method of turbulence infrasound suppression by using impeller screen cover was discussed. The infrasound model induced by turbulence of centrifugal fan was deduced. Based on the analysis of the aerodynamic characteristics of the impeller blades in the impeller, the mathematical model of the infrasonic power of the impeller after the impeller is installed, the power of the vortex radiation at the trailing edge of the blade, and the amount of infrasonic noise of the grille The infrasound test and theoretical calculation are carried out with a window air conditioner centrifugal fan as an example. The results show that the theory and practice are consistent.