蜗壳散射对离心风机气动噪声传播的影响

毛义军; 祁大同; 刘晓良

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蜗壳散射对离心风机气动噪声传播的影响

更新时间：2025-07-09

- 蜗壳散射对离心风机气动噪声传播的影响
- Analysis on Effect of Volute Scattering on Aerodynamic Noise Propagation of Centrifugal Fan
- 西安交通大学学报 2009年43卷第5期页码：51-55
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： TB432
- 网络首发：2009-05-10，
  
  纸质出版：2009
- 稿件说明：
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毛义军, 祁大同, 刘晓良. 蜗壳散射对离心风机气动噪声传播的影响[J]. 西安交通大学学报, 2009,43(5):51-55.

Analysis on Effect of Volute Scattering on Aerodynamic Noise Propagation of Centrifugal Fan[J]. 2009, 43(5): 51-55.
毛义军, 祁大同, 刘晓良. 蜗壳散射对离心风机气动噪声传播的影响[J]. 西安交通大学学报, 2009,43(5):51-55. DOI：

Analysis on Effect of Volute Scattering on Aerodynamic Noise Propagation of Centrifugal Fan[J]. 2009, 43(5): 51-55. DOI：

摘要

理论分析了声波在空气-钢板界面上的传播过程.结果表明:声波在蜗壳壁面上的入射角不小于3.23°时发生全反射; 在入射角小于3.23°时虽然存在声波的透射

但当蜗壳厚度不小于3 mm时

声波经A声级计权后的隔声量大于40 dB

证明了将蜗壳作为声学硬边界条件处理的合理性.采用薄壳体边界元方法计算分析了将蜗壳作为声学硬边界对声波传播的影响

结果表明:蜗壳对低频声波传播的影响不明显

风机低频声源可以近似为紧凑声源

但随着频率的增大

声波受到蜗壳散射的影响逐步明显

蜗壳曲面上的漫反射使得风机内部分布声源激发的声场趋近均匀化.

Abstract

The effect of volute scattering on aerodynamic noise propagation of a centrifugal fan was analyzed. The theoretical result shows that full reflection of sound wave will occur on the air-steel volute interface when the incidence angle is more than 3.23 degree

but when the incidence angle is less than 3.23 degree

the A-weighted sound transmission loss is more than 42dB as long as the volute thickness is not less than 3mm. It seems that the volute could be regarded as an acoustic rigid boundary in noise prediction. A further numerical study was carried out by using a thin-body boundary element method(BEM)to analyze the influence of volute scattering on sound propagation. The numerical result shows that volute scattering has slight effect on low-frequency sound propagation and the fan low-frequency noise source can be viewed as a compact source. However

the effect of volute scattering on sound propagation is significant with the increase in sound frequency. The sound field generated by the distributed source in the centrifugal fan is distributed quite uniformly because of the diffuse reflection to the volute.

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references

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