轴流风扇宽频噪声声功率实验研究
收稿日期: 2014-09-18
修回日期: 2015-03-24
网络出版日期: 2015-04-21
基金资助
国家自然科学基金 (51476134); 空气动力学国家重点实验室研究基金(SKLA20140201)
Experimental research of broadband sound power determination in axial fan
Received date: 2014-09-18
Revised date: 2015-03-24
Online published: 2015-04-21
Supported by
National Natural Science Foundation of China (51476134); State Key Laboratory of Aerodynamics Research Fund (SKLA20140201)
许坤波 , 乔渭阳 , 王良峰 , 仝帆 . 轴流风扇宽频噪声声功率实验研究[J]. 航空学报, 2015 , 36(9) : 2939 -2946 . DOI: 10.7527/S1000-6893.2015.0080
It is in urgent need for aircraft engine noise reduction research to find a kind of measurement technique for broadband noise determination in turbomachinery duct to guide the noise reduction design. In this paper, we use wall-flush annularly installed microphone array to measure the noise of axial fan and finally obtain the broadband sound power in duct by means of cross-spectra between measurement signals and reference signal and the application of singular value decomposition (SVD) method. The results show that this experimental technique enables the calculation of not only in-duct transmitted sound power for dominant tones, but also broadband noise over a wide frequency range; this method also helps to distinguishe between sound power transmitted in and against the direction of flow. Broadband noise results confirm that this method behaves fairly robust in loud background noise and hard wall reflection condition.
Key words： broadband noise; mode; array; turbomachinery; axial fan
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