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一、前言前弯多叶片离心风机具有全压高、流量大、体积小、重量轻等特点,近年来在空调、建筑、船用、农业植保等方面用得越来越广。一般空调和船用风机转速较低,但对噪声的要求很高,植保用风机转速较高,噪声很大,有的高达107db。因此研究离心风机的噪声特性,从结构上采取措施以降低噪声是有意义的。国内外在这方面做了大量的工作,但降低噪声的方法均有缺限性。本文从流体力学角度出发分析离心风机的噪声特性,改善流体在流道中的流动情况,减
I. Introduction Forebend multi-blade centrifugal fan with full pressure, flow, small size, light weight and other characteristics, in recent years in air conditioning, construction, marine, agricultural protection and more widely used. General air conditioning and marine fan speed is low, but the high noise requirements, plant protection fans with high speed, noise, and some as high as 107db. Therefore, it is significant to study the noise characteristics of centrifugal fans and take structural measures to reduce the noise. A great deal of work has been done at home and abroad in this respect, but the methods of reducing noise all have limitations. This paper analyzes the noise characteristics of centrifugal fan from the point of view of fluid mechanics and improves the fluid flow in the flow channel,