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To seek better energy extraction performance of a flapping hydrofoil, various nonsinusoidal motion profiles are employed instead of conventional sinusoidal flapping motions. The effects of nonsinusoidal motions are investigated for four kinds of nonsinusoidal flapping motions, i.e. varying effective angle of attack profile, nonsinusoidal pitching motion combined with sinusoidal plunging, nonsinusoidal...
A modified flapping motion for an oscillating foil is proposed for energy extraction and the energy extraction performance of this proposed motion is numerically studied. Computations are performed at Re = 10 4 with a 2-D elliptical foil with thickness of 10% chord applied. The investigation is undertaken over a wide range of kinematic parameters (reduced frequency k, pitching amplitude θ...
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