Effects of trailing edge bluntness on airfoil tonal noise at low Reynolds numbers

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• 作者：Walter Arias Ramírez ; William Roberto Wolf
• 关键词：Airfoil noise ; Trailing edge bluntness ; Direct numerical simulation ; Acoustic analogy
• 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：38
• 期：8
• 页码：2369-2380
• 全文大小：6,510 KB
• 刊物主题：Mechanical Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1806-3691
• 卷排序：38

文摘

The aim of this study is to analyze the effects of trailing edge bluntness on airfoil tonal noise generation and propagation at low Reynolds numbers. Several simulations are conducted for a NACA0012 airfoil at four different free-stream Mach numbers, \(M_{\infty }\) = 0.2–0.5. The angle of incidence is set equal to 3°, and the Reynolds number based on the airfoil chord is \(Re_{c}\) = 5,000. The effects of compressibility on sound generation and propagation are analyzed along with the effects of scattering by blunt trailing edges with four different radii of curvature. Sound generation by vortex shedding is computed by a hybrid method and an accurate two-dimensional direct calculation, and results are compared. The hybrid approach uses direct calculation for near-field source computations and the Ffowcs Williams–Hawkings equation as the acoustic analogy formulation. Numerical results show that the airfoil emits an intense “narrow-band” tone and that a thicker trailing edge emits higher noise levels than a thinner one since the magnitude of quadrupole sources is larger for the thicker configuration. Moreover, the spatial distribution of quadrupole sources shows that the peak quadrupole values are closer to the surface when the trailing edge is thicker, which, again, increases the scattered far-field noise.