Numerical Prediction of Aerodynamic Noise for Centrifugal Fan

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Numerical Prediction of Aerodynamic Noise for Centrifugal Fan

更新时间：2025-07-09

- Numerical Prediction of Aerodynamic Noise for Centrifugal Fan
- Vol. 43, Issue 3, Pages: 65-69(2009)
- 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：
  CLC： TH45;TB115
- Online First：10 March 2009，
  
  Published：2009
- 稿件说明：
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Numerical Prediction of Aerodynamic Noise for Centrifugal Fan[J]. 2009, 43(3): 65-69.
DOI：

Numerical Prediction of Aerodynamic Noise for Centrifugal Fan[J]. 2009, 43(3): 65-69. DOI：

摘要

介绍了一种开口薄壳体边界元方法

该方法的系数矩阵小于以前的方法

能够降低计算成本.将该方法应用在离心风机的噪声预测中并考虑了蜗壳对声波反射和散射的影响.首先利用RANS方程和标准k-ε模型求解离心风机内部的非定常流动

获得声源项信息

然后采用快速傅里叶变换将源项的时域信息转换为频域信息

最后采用开口薄壳体边界元方法预测风机的气动噪声.数值计算和实验测量结果表明

由于该方法考虑了蜗壳反射和散射的影响

对风机基频及其2次谐波的声压级具有较好的预测精度

但对高频声的预测结果仍不是很满意.

Abstract

A thin-body acoustic boundary element method was applied to predict the aerodynamic noise from a centrifugal fan considering the scattering effect of volute casing. The method can reduce computational cost because its coefficient matrix is smaller than that of conventional methods. The turbulent inner field was computed by solving the unsteadyReynolds averaged N-S equations with k-ε turbulence model. The time accurate acoustic source was transformed to the frequency dependent signals. The thin-body boundary element method was used to predict the aerodynamic tonal noise. The calculated sound pressure levels were compared with the experimental data. The result shows that the calculated sound pressure levels(SPLs)agree well with the experimental data in blade passing frequency and its second harmonic

but the SPLs at high frequency are not well predicted.

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references

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