摘要
为了研究多翼离心风机出口涡旋的成因与抑制方法,对中静压风机进行数值模拟与试验验证,分析其内部流场和噪声特性,并提出了抑制出口涡旋的整流片方法,试验结果验证了方法的可行性。研究表明,多翼离心风机蜗壳内的涡旋流动属于螺旋流动,是由于多翼离心风机内部结构存在大角度转变导致。蜗壳出口涡旋来源为叶轮出口气流大角度转变引起与蜗壳和叶轮间距内二次流引起。通过在蜗壳180°~270°截面间设置整流片达到了调节蜗壳内部气流分布,改善螺旋流动,减弱涡旋流动强度,降低多翼离心风机噪声的目的。经过等风量试验测试对比,验证了整流片的降噪效果,在不同静压工况下均有较好的降噪效果,30 Pa静压工况下为最大降噪幅度1.2 dB,100 Pa静压工况下为最小降噪幅度0.7 dB。研究结果可为多翼式离心风机的降噪提供依据。
In order to study the causes and suppression methods of the vortex at the outlet of the multi-blade centrifugal fan,a combination of numerical simulation and experimental verification was used to carry out the numerical simulation calculation of the medium static pressure fan,and the internal flow field and noise characteristics were analyzed,and a rectifier method was proposed to suppress the outlet vortex.The experimental results verified the feasibility of the method.The results show that the vortex flow in the volute of the multi-blade centrifugal fan belongs to the spiral flow,which is caused by the large-angle transformation of the internal structure of the multi-blade centrifugal fan.The source of the vortex at the outlet of the volute is caused by the large angle change of the airflow at the outlet of the impeller and the secondary flow in the distance between the volute and the impeller.The purpose of adjusting the airflow distribution inside the volute,improving the spiral flow,weakening the strength of the vortex flow,and reducing the noise of the multi-blade centrifugal fan was achieved by setting the rectifier in the 180°~270°section of the volute.The noise reduction effect of the rectifier was verified through the experimental test of equal air volume.It has good noise reduction effect under different static pressure conditions.The maximum noise reduction amplitude was 1.2 dB under the 30 Pa static pressure condition,and the minimum noise reduction amplitude was 0.7 dB at 100 Pa.The research results can provide basis for noise reduction of multiblade centrifugal fan.
作者
雷健
秦国良
吴彦东
韦福权
LEI Jian;QIN Guoliang;WU Yandong;WEI Fuquan(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Guangdong Midea Air Conditioning Equipment Co.,Ltd.,Foshan 528000,China)
出处
《流体机械》
CSCD
北大核心
2022年第12期65-71,共7页
Fluid Machinery
基金
国家重点研发计划项目(2018YFB0606104)。
关键词
多翼离心风机
降噪
整流片
试验研究
Abstract:multi-blade centrifugal fan
noise reduction
rectifier
experimental study
