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        Experimental investigation of low speed flow over flapping airfoils and airfoil combinations

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        Author
        Mahmoud, Osama Mohamed Kamal Mohamed
        Date
        2001-09
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        Abstract
        A wind tunnel investigation of low speed flow over flapping airfoils and airfoil combinations was performed using flow visualization and laser Doppler velocimetry. Specifically, three cases were studied: A NACA0014 airfoil oscillating in a sinusoidal plunge mode, A NACA0014 airfoil oscillating in a sinusoidal plunge mode near a ground plane, and two NACA0014 airfoils arranged in a biplane configuration and oscillating in counterphase in a sinusoidal plunge mode. The plunge amplitude-to-airfoil chord ratio was 0.4, the reduced frequency of oscillation was 1.0 and the Reynolds number based on airfoil chord was set at 8760. Conditionally sampled measurements of the axial flow velocity were taken at numerous flow field points providing detailed information about the flow features generated by this type of flapping motion. These measurements were complemented by time-averaged flow field data and by visualization of the instantaneous flow field at various points during the flapping cycle. Furthermore, the thrust generated by the sinusoidal plunge motion was measured with a laser range finder. The results shows that vortex shedding occurs both from the airfoil leading and trailing edge.
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        http://hdl.handle.net/10945/3382
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          Experimental investigation of low speed flow over flapping airfoils and airfoil combinations 

          Mahmoud, Osama Mohamed Kamal Mohamed (Monterey, California. Naval Postgraduate School, 2001-09);
          A wind tunnel investigation of low speed flow over flapping airfoils and airfoil combinations was performed using flow visualization and laser Doppler velocimetry. Specifically, three cases were studied: A NACA0014 airfoil ...
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          The analysis of wake-induced unsteady aerodynamics as related to higher harmonic control 

          Abourahma, Ahmed Ali Mohammed Hassan (Monterey, California. Naval Postgraduate School, 1993-12);
          Performance data from the NASA-Army OH-6A higher harmonic control (HHC) flight test program showed significant reductions in main rotor shaft torque and engine power in hover and forward flight 1. The unsteady aerodynamics ...
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          The Unsteady Aerodynamics of Flapping-Foil Propellers 

          Platzer, M.F.; Jones, K.D. (2001);
          It is the objective of this paper to summarize the authors' recent work on flapping foils. Water tunnel experiments on sinusoidally plunging foils are described which elucidate the change in vortical wake pattern shed from ...
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