Aerofoil geometry effects on turbulence interaction noise
Aerofoil geometry effects on turbulence interaction noise
复制标题
机翼几何形状对湍流相互作用噪声的影响
DOI：
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复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Chaitanya Paruchuri
中科院分区：
文献类型：
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作者：
Chaitanya Paruchuri
风扇宽带是飞机发动机的主要噪声源之一，尤其是进场噪声。主要的噪声产生机制是湍流-翼型干扰噪声(TAI)。本文研究了二维翼型几何形状的变化对TAI噪声的影响。本论文的主要重点是试图通过发展创新的前沿几何来减少这种影响。本论文的前两章是关于翼型几何形状对单翼型和叶栅干扰噪声影响的实验和数值研究。本论文的前两章是关于翼型几何形状对单翼型和叶栅干扰噪声影响的实验和数值研究。与前人的工作一致，它们表明，翼型参数的变化，如翼型厚度、前缘机头半径和弯度，在进近条件下只会产生很小的宽带干扰噪声变化。随后的章节论述了旨在减少交互噪声的创新前沿锯齿PROfiLES的开发。第四章详细研究了单波长锯齿波在降低相互作用噪声方面的局限性。最优的PROfiLE是IDentified。第5章、第6章和第7章都涉及创新的PROfiLE的开发，与单波长锯齿波相比，这种LES可以提供高达10dB的额外噪音降低。对于所研究的每个PROfiLE，都建立了一个简单的模型来帮助理解它们的相互作用机理。
Fan broadband is one of the dominant noise sources on an aircraft engine, particularly at approach. The dominant noise generation mechanism is due to turbulent- aerofoil interaction noise (TAI). This thesis investigates the effect of changes in 2D aerofoil geometry on TAI noise. The main focus of this thesis is to attempt to reduce it through the development of innovative leading edge geometries. The first two chapters of the thesis deals with an experimental and numerical investigation into the effect of aerofoil geometry on interaction noise on single aerofoils and on cascades. Consistent with previous work, they show that variations in aerofoil parameters, such as aerofoil thickness, leading edge nose radius and camber, produce only a small changes in broadband interaction noise at approach conditions. Subsequent chapters deal with the development of innovative leading edge serration profiles aimed at reducing interaction noise. Chapter 4 is a detailed study into the limitations of single-wavelength serrations in reducing interaction noise. The optimum profile is identified. Chapters 5, 6 and 7 all deal with the development of innovative profiles that can provide up to 10dB of additional noise reductions compared to single-wavelength serrations. For each of the profiles investigated a simple model is developed to aid the understanding of their interaction mechanism.
DOI：
10.2514/6.2014-2325
发表时间：
2014-06
期刊：
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影响因子：
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作者：
S. Haeri;J. Kim;S. Narayanan;P. Joseph
通讯作者：
S. Haeri;J. Kim;S. Narayanan;P. Joseph
影响因子：
4.7
作者：
Lau, Alex S. H.;Haeri, Sina;Kim, Jae Wook
通讯作者：
Kim, Jae Wook