Trailing edge serrations : Effect of their flap angle on flow and acoustics

Trailing edge serrations : Effect of their flap angle on flow and acoustics
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后缘锯齿：其襟翼角度对流动和声学的影响

DOI：
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发表时间：
2017
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影响因子：
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通讯作者：
J. Madsen
J. Madsen
中科院分区：
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文献类型：
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作者：
C. A. León;R. M. Martínez;D. Ragni;S. Pröbsting;F. Avallone;A. Singh;J. Madsen

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后缘锯齿已被证明可以作为被动降噪装置。然而，之前也发现它们会增加特定频率范围内的噪声，早期研究认为这是由于锯齿与尾流中的流动方向未对准所致。它表现为频谱宽带区域中高频噪声的增加。本研究利用声波束形成研究了锯齿流错位对噪声发射的影响，并发现了与使用粒子图像测速 (PIV) 对流动进行的观测之间的相关性。由此确定了噪声增加的流体动力源，并提出了高频噪声增加的斯特劳哈尔数关系
Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed