Experimental assessment of the noise generated at the leading edge of porous airfoils using microphone array techniques
Experimental assessment of the noise generated at the leading edge of porous airfoils using microphone array techniques
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使用麦克风阵列技术对多孔翼型前缘产生的噪声进行实验评估
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Hobracht
中科院分区：
文献类型：
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作者：
T. Geyer;E. Sarradj;J. Giesler;M. Hobracht
低渗透性材料是一种已知的用于降低翼型件航空声学噪声的方法。在开放式射流风洞中，利用传声器阵列测量技术和三维波束形成算法对多孔翼型模型前缘噪声进行了详细的声学测量。一组三个不同的网格提供了所需的湍流。本文给出了多孔翼型前缘产生的噪声的测量结果，并与无孔参考翼型进行了比较。对参考翼型测得的前缘噪声谱与理论值进行比较，结果吻合得很好。声学测量的结果表明，具有低气流阻力的多孔翼型导致显著的噪声降低，这被认为是由这些材料的较大孔相比，具有较高的气流阻力的多孔翼型。
ow{permeable materials is a known method for the reduction of airfoil aeroacoustic noise. Detailed acoustic measurements on the noise generation at the leading edge of porous airfoil models were performed in an open jet wind tunnel using microphone array measurement techniques and three{dimensional beamforming algorithms. A set of three dierent grids provided the required inow turbulence. Measurement results are presented for the noise generated at the leading edge of porous airfoils, which are characterized by their air ow resistivity, compared to a non{porous reference airfoil. The comparison of the leading edge noise spectra measured for the reference airfoil with theory yields good agreement. The results of the acoustic measurements show that porous airfoils with low air ow resistivities lead to a noticeable noise reduction, which is assumed to be caused by the larger pores of these materials compared to porous airfoils with a higher air ow resistivity.