Serrated slat cusp for high-lift device noise reduction
Serrated slat cusp for high-lift device noise reduction
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DOI：
10.1063/5.0035178
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发表时间：
2021-01
影响因子：
4.6
通讯作者：
Hasan Kamliya Jawahar;S. A. Showkat Ali;M. Azarpeyvand
中科院分区：
文献类型：
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作者：
Hasan Kamliya Jawahar;S. A. Showkat Ali;M. Azarpeyvand
对装有两种不同锯齿缝翼尖部的30P30N三段高升力翼型进行了缝翼尖部锯齿降噪性能的实验评估和验证。气动特性的评估与表面压力分布的帮助下，和所有测试的布局之间的差异不大。通过近场和远场测量研究了缝翼锯齿的非定常流动特性，以更深入地了解噪声产生的机理。虽然增加表面压力波动证明了缝翼锯齿，在远场噪声的显着减少被观察到。近场能量水平的增加归因于缝翼凹部和主元件内的非传播流体动力能量场，而远场噪声降低归因于缝翼锯齿消除了旋涡脱落。高阶谱分析和小波分析进一步证实了观测结果和假设。
Noise reduction capabilities of slat cusp serration were experimentally assessed and demonstrated for a 30P30N three-element high-lift airfoil fitted with two different types of serrated slat cusps. Aerodynamic characteristics were evaluated with the aid of surface pressure distribution, and insignificant differences were found among all the tested configurations. The unsteady flow characteristics of the slat serrations were examined using near- and far-field measurements to gain a deeper understanding of the noise generation mechanism. Although increased surface pressure fluctuations were demonstrated by the slat serrations, a substantial reduction in the far-field noise was observed. The increase in the near-field energy levels was attributed to the non-propagating hydrodynamic energy field within the slat cove and the main element, whereas the far-field noise reduction was attributed to the elimination of vortex shedding by the slat serration. Further reaffirmation of the observations and hypothesis was provided with higher-order spectral analysis and wavelet analysis.