Airfoil Turbulence-Impingement Noise Reduction by Porosity or Wavy Leading-Edge Cut : Experimental Investigations
Airfoil Turbulence-Impingement Noise Reduction by Porosity or Wavy Leading-Edge Cut : Experimental Investigations
复制标题
通过孔隙度或波状前缘切割降低翼型湍流冲击噪声：实验研究
DOI：
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Moreau
中科院分区：
文献类型：
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作者：
M. Roger;S. Moreau
目前的工作旨在评估两种可能的技术的有效性，以减少湍流撞击翼型前缘所产生的噪声。第一种技术是用波浪形的前缘代替直的前缘。第二种方法是用多孔材料制造部分翼型。两者都是在相同基线刚性翼型的修改版本NACA-0012翼型上进行测试的，方法是将模型放置在开式喷流消声风洞提供的流动中的网格生成的湍流中。用薄板代替翼型或用圆柱体代替湍流网格进行附加试验。描述了一种逐步减去背景噪声和后缘噪声源的过程，以便明确地量化减少技术的益处。两者都被发现在相当大的频率范围内降低了4到8分贝的噪音。
The present work is aimed at assessing the effectiveness of two possible techniques to reduce the noise produced by turbulence impinging on the leading edge of an airfoil. The first technique consists in replacing the straight leading edge by a wavy leading edge. The second one consists in manufacturing part of the airfoil with a porous material. Both are tested on modified versions of the same baseline rigid-airfoil NACA-0012 airfoil, by placing the mockups in grid-generated turbulence in the flow delivered by an open-jet anechoic wind tunnel. Additional tests are made with thin plates instead of the airfoil or with a circular cylinder instead of a turbulence grid. A step-by-step procedure is described to subtract background noise and trailing-edge noise sources in order to unambiguously quantify the benefit of the reduction techniques. Both are found to reduce the noise by amounts between 4 to 8 dB in substantial frequency ranges.
影响因子：
4.7
作者：
Lau, Alex S. H.;Haeri, Sina;Kim, Jae Wook
通讯作者：
Kim, Jae Wook
波状前缘降噪机翼-湍流相互作用的机理研究
DOI：
10.2514/6.2015-3269
发表时间：
2015
期刊：
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影响因子：
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作者：
Haeri S
通讯作者：
Haeri S