本文用实验方法验证了离心式风机声学共振腔蜗舌穿孔板随着厚度的增加，基频声压级下降的幅值逐渐减小。当穿孔板厚度大于２ｍｍ时，声学共振腔蜗舌不起降低噪声作用，当穿孔板厚度小于２ｍｍ时，流量系数Ｑ和压力系数Ｐ比原机无声学共振腔式蜗舌时平均下降约４．４％和 ３．８７％，对风机气动力性能影响不明显。　 In this paper, the experimental method was used to verify that the amplitude of the sound pressure level decrease gradually with the increase of the thickness of the perforated plate of centrifugal fan cavity. When the thickness of the perforated plate is more than 2mm, the cavity of the acoustic cavity can not reduce the noise. When the thickness of the perforated plate is less than 2mm, the flow coefficient Q and the pressure coefficient P decrease about 4 from the average without the acoustical cavity volute. 4% and 3.87%, the aerodynamic performance of fans is not obvious.