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Dynamics of co-rotating vortices in a flow around a bio-inspired corrugated airfoil
International Journal of Heat and Fluid Flow ( IF 2.6 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ijheatfluidflow.2020.108603
P. Sooraj , Abhishek Sharma , Amit Agrawal

Abstract Bio-inspired corrugated airfoils show favourable aerodynamic characteristics such as high coefficient of lift and delayed stall at low Reynolds numbers. Two-dimensional (2D) direct numerical simulation has been performed here on a corrugated airfoil at various angles of attack (0°, +5°, -5°) and Reynolds number of 280 to 6700. The objective is to analyse the pressure variation inside the corrugations and correlate it to the vortex movement across the corrugations and the overall aerodynamic characteristics of the corrugated airfoil. The flow characteristics have been examined based on the local Strouhal numbers in the corrugations of the airfoil. It is observed that the pressure variation in each corrugation is the result of vortex merging and separation in the corrugation which plays a major role in changing the flow characteristics. The Strouhal number of the flow is dictated by the most dominant local Strouhal number. The numerical results are further compared with experimental results obtained using particle image velocimetry, and the two set of results are found to match well. These results are significant because they elucidate the effect of corrugation, angle of attack, and Reynolds number on flow over a corrugated airfoil.

中文翻译:

仿生波纹翼型周围流动中的同向旋转涡流动力学

摘要 仿生波纹翼型在低雷诺数下表现出较高的升力系数和延迟失速等良好的气动特性。二维 (2D) 直接数值模拟已在各种迎角(0°、+5°、-5°)和雷诺数为 280 至 6700 的波纹翼型件上进行。目的是分析压力变化波纹内部,并将其与穿过波纹的涡流运动和波纹翼型的整体空气动力学特性相关联。已经根据翼型波纹中的局部 Strouhal 数检查了流动特性。可以观察到,每个波纹中的压力变化是波纹中涡流合并和分离的结果,这在改变流动特性中起主要作用。流动的 Strouhal 数由最主要的局部 Strouhal 数决定。进一步将数值结果与使用粒子图像测速法获得的实验结果进行比较,发现两组结果匹配良好。这些结果很重要,因为它们阐明了波纹、攻角和雷诺数对波纹翼型流动的影响。
更新日期:2020-08-01
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