流体机械2025，Vol.53Issue(8)：86-93,8.DOI:10.3969/j.issn.1005-0329.2025.08.011
蜗舌区间隙调节对多翼离心风机噪声的影响
Effect of clearance adjustment at volute tongue region on noise in multi-wing centrifugal fans
摘要
Abstract
To address the efficiency reduction caused by clearance backflow at the volute tongue of a double-suction multi-wing centrifugal fan,a clearance adjustment control structure unit is proposed.This unit is installed on the front and rear cover plates of the volute near the volute tongue to achieve clearance adjustment.By adding structural units of different thicknesses to adjust the clearance,numerical analysis methods are used to simulate the internal flow field of the fan under different clearances.The effectiveness of the clearance adjustment is verified through aerodynamic performance and noise tests of the fan.The results show that the clearance adjustment unit can effectively reduce backflow at the volute tongue,improve the static pressure recovery capability of the volute,and ameliorate the backflow state at the impeller front shroud.It also enhances the axial distribution uniformity of the annular flow rate at the impeller outlet,thereby increasing the impeller work efficiency.However,when the axial thickness of clearance adjustment unit is excessive,it aggravates impact at the volute tongue,leading to a noise increase of 4.8 dB.When the axial thicknesses of the two clearance adjustment units are equal to the axial distances between the impeller front and rear shrouds and the volute front and rear cover plates,respectively,the measured noise can be reduced by 0.7 dB,the maximum air volume increased by 0.8 m3/min,and the efficiency improved by nearly 2%.This study provides a theoretical basis and engineering practice reference for the aerodynamic performance optimization and low-noise design of multi-wing centrifugal fans.关键词
双吸多翼离心风机/间隙调节单元/轴向调节/气动性能/降噪Key words
double-suction multi-wing centrifugal fan/clearance adjustment unit/axial adjustment/aerodynamic performance/noise reduction分类
机械制造引用本文复制引用
殷宁芳,陈旭斌,王艳辉,胡天聪,王军,施旭娜,杨筱沛..蜗舌区间隙调节对多翼离心风机噪声的影响[J].流体机械,2025,53(8):86-93,8.基金项目
国家重点研发计划专项(2018YFB0606101) （2018YFB0606101）
