The impact of flapping trajectories on the induced thrust of a Single and tandem configuration flapping foil

Duppala Azad, Sunny Kumar Annam, V. R. Menda, P. Swain, Srinivas Vadapalli, Divakar Bommana
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Abstract

The development of propulsion devices by using the propulsive mechanisms of aquatic animals such as fish is a challenging task. An attempt has been made to replicate the fishtailed motion that caused thrust in the current investigation. At a low Reynolds number of Re = 1173, the propulsive performance of NACA (National Advisory Committee for Aeronautics) 0012 flapping foils enduring distinct flapping trajectories (fishtailed and elliptical) is evaluated. A dynamic mesh arbitrary Lagrangian-Eulerian framework is used to understand the desired flapping motion of the foils while solving the flow via in-compressible Navier-Stokes equations. Along with the flapping trajectory, the effects of the Strouhal number (St), inter-foils distance (Lx), and phase angle (φ) between the foils on the produced thrust are examined. The results demonstrate that using tandem configuration flapping foil with elliptical and fishtailed flapping can significantly increase the induced thrust and propulsive efficiency.
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拍打轨迹对单层和串联结构拍打箔片感应推力的影响
利用鱼类等水生动物的推进机制开发推进装置是一项具有挑战性的任务。在当前的研究中,我们尝试了复制鱼尾运动来产生推力。在 Re = 1173 的低雷诺数条件下,对 NACA(美国国家航空咨询委员会)0012 拍打箔的推进性能进行了评估,其拍打轨迹(鱼尾和椭圆)各不相同。在通过可压缩纳维-斯托克斯方程求解流动的同时,使用了动态网格任意拉格朗日-欧勒框架来理解箔片所需的拍打运动。在研究拍打轨迹的同时,还研究了箔片之间的斯特劳哈尔数 (St)、箔片间距 (Lx) 和相位角 (φ) 对产生推力的影响。结果表明,使用椭圆形和鱼尾形串联配置的拍打箔片可以显著提高诱导推力和推进效率。
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