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Thrust augmentation of flapping airfoils in low Reynolds number flow using a flexible membrane |
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| Affiliation: | 1. Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015-3085, USA;2. AFRL/RQAC, Bldg 146 Rm 215, 2210 Eighth Street, Wright-Patterson AFB, OH 45433-7512, USA;1. LIFTEC (Laboratorio de Investigación en Fluidodinámica y Tecnologías de la Combustión), CSIC – Universidad de Zaragoza, C/ María de Luna 10, 50018 Zaragoza, Spain;2. Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Av. de los Descubrimientos s/n, 41092 Sevilla, Spain;1. McGill University, Department of Mechanical Engineering, Macdonald Engineering Building, Room 270, 817 Sherbrooke Street West, Montreal, Quebec, Canada H3A 0C3;2. Podgorny Institute for Mechanical Engineering, National Academy of Science of Ukraine, Department of Vibrations, 2/10 Dm. Pozharskogo St., 61046 Kharkiv, Ukraine;3. Department of Gas and Fluid Mechanics, National Technical University “KhPI”, Frunze St. 21, Kharkiv 61002, Ukraine |
| Abstract: | The unsteady aerodynamic thrust and aeroelastic response of a two-dimensional membrane airfoil under prescribed harmonic motion are investigated computationally with a high-order Navier–Stokes solver coupled to a nonlinear membrane structural model. The effects of membrane prestress and elasticity are examined parametrically for selected plunge and pitch–plunge motions at a chord-based Reynolds number of 2500. The importance of inertial membrane loads resulting from the prescribed flapping is also assessed for pure plunging motions. This study compares the period-averaged aerodynamic loads of flexible versus rigid membrane airfoils and highlights the vortex structures and salient fluid–membrane interactions that enable more efficient flapping thrust production in low Reynolds number flows. |
| Keywords: | Flapping propulsion Membrane wing Micro air vehicle Vortex dynamics Navier–Stokes simulations |
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