风扇管道宽频噪声的声功率和远场指向性研究

许坤波; 陈誉; 仝帆; 乔渭阳

doi:10.13224/j.cnki.jasp.20220015

风扇管道宽频噪声的声功率和远场指向性研究

doi: 10.13224/j.cnki.jasp.20220015

1.
上海海事大学物流工程学院，上海 201306
2.
南京工程学院燕山大学-南京工程学院联合研究院，南京 211167
3.
中国空气动力研究与发展中心气动噪声控制重点实验室，四川绵阳 621000
4.
西北工业大学动力与能源学院，西安 710129

基金项目: 国家自然科学基金（12002150）；江苏省自然科学基金（BK20201041）；教育部人文社科基金（20YJCZH196）；中国高等教育科学研究规划课题（22XX0415）

详细信息

作者简介:
许坤波（1988-），男，副教授、硕士生导师，博士，主要从事叶轮机械气动噪声研究。E-mail：kbxu@shmtu.edu.cn

中图分类号: V231.3
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- 被引次数: 0
出版历程
- 收稿日期: 2022-01-11
- 网络出版日期: 2023-09-14

Research on sound power and far-field directivity of fan ducted broadband noise

1.
Logistics Engineering College，Shanghai Maritime University，Shanghai 201306，China
2.
Nanjing Institute of Technology-Yanshan University Joint Research Institute， Nanjing Institute of Technology，Nanjing 211167，China
3.
Laboratory of Aerodynamic Noise Control， China Aerodynamics Research and Development Center，Mianyang Sichuan 621000，China
4.
School of Power and Energy，Northwestern Polytechnical University，Xi’an 710129，China

摘要

摘要:
针对风扇管道宽频噪声，利用两传声器模态分解方法对风扇宽频噪声模态分解、声功率测量以及远场辐射特性进行了研究，与需要较多数量的传声器阵列测量方法相比，这种优势在高频管道宽频噪声测量上尤为突出。本文针对该方法的有效性和准确性进行了数值研究，并基于轴流风扇试验台实验验证了该方法的精确性。该方法预测出的声功率与理论值完全吻合。风扇噪声实验结果表明两传声器方法在声功率方面有较高的准确性，最大误差为3 dB，其预测的远程辐射指向性在20°～60°范围内能较为准确地捕捉风扇进口端远场噪声辐射特征，但需要指出的是其预测精度对传声器间距非常敏感，小间距麦克风测量的相关性特征更加稳定，促使其预测精度比间距更大的结果更高。
- 模态分解 /
- 阵列 /
- 宽频噪声 /
- 风扇管道 /
- 叶轮机械 /
- 声功率测量
Abstract:
For the fan ducted broadband noise, a two-microphone modal decomposition method was used to study the fan broadband noise modal decomposition, sound power measurement and far-field radiation characteristics. Compared with the measurement method requiring a larger number of microphone arrays, it is especially prominent in the measurement of broadband noise in high frequency pipelines. A numerical study on the effectiveness and accuracy of the method was carried out, and the accuracy of the method was verified based on the axial fan experiment. The sound power predicted by this method was in perfect agreement with the theoretical value. The experimental measurement results of fan noise showed that the two-microphone method had high accuracy in terms of sound power, and the maximum error was 3 dB. The predicted radiation directivity can accurately capture the far-field noise radiation characteristics of the fan from 20 to 60 degrees, but it should be pointed out that its prediction accuracy was very sensitive to the micro-phone spacing, and the correlation characteristics of small-spacing microphone measurements were more stable, making its prediction accuracy higher than results with larger spacing.
- mode determination /
- array /
- broadband noise /
- fan ducted /
- turbomachinery /
- sound power detection

HTML

图 1 气流圆形管道示意图

Figure 1. Sketch of circular duct with flow

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图 2 相关系数幅值

Figure 2. Amplitude of correlation coefficients

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图 3 相关系数相位

Figure 3. Phase of correlation coefficients

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图 4 两传声器方法求解出的入射、反射波与理论值的对比

Figure 4. Comparison of analytical and inverted incident , reflected waves by two-microphone method

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图 5 风扇实验台及其远场阵列

Figure 5. Fan test rig and the far-field array

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图 6 模态幅值分布函数

Figure 6. Modal amplitude distribution function

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图 7 远场声功率计算值和测量值对比

Figure 7. Comparison of the calculated and measured far-field sound power

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图 8 远场1/3倍频程频谱计算值和测量值对比

Figure 8. Comparison of the calculated and measured far-field 1/3 octave band spectra

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图 9 $\Delta x = 0.03\;{\text{m}}$时两传声器方法预测的指向性

Figure 9. Directivity predicted by two-microphone method at $\Delta x = 0.03\;{\text{m}}$

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图 10 $\Delta x = 0.05\;{\text{m}}$时两传声器方法预测的指向性

Figure 10. Directivity predicted by two-microphone method at $\Delta x = 0.05\;{\text{m}}$

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图 11 $\Delta x = 0.07\;{\text{m}}$时两传声器方法预测的指向性

Figure 11. Directivity predicted by two-microphone method at $\Delta x = 0.07\;{\text{m}}$

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图 12 $\Delta x = 0.10\;{\text{m}}$时两传声器方法预测的指向性

Figure 12. Directivity predicted by two-microphone method at $\Delta x = 0.10\;{\text{m}}$

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图 13 4种传声器间距下的相关系数幅值频谱

Figure 13. Correlation coefficient magnitude at four spacings

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图 14 不同间距下相关系数的相位谱对比

Figure 14. Phase spectrum comparison of correlation coefficients at different spacings

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