Dynamique tourbillonnaire dans le sillage d'un aileron oscillant : Propulsion par ailes battantes biomimétiques

Abstract : This thesis deals with the fundamental mecanisms implied in flapping based propulsion systems. We use a simplified model, which consists of a flapping foil, placed in a hydrodynamic tunnel. This set up allows us to establish a framework for the analyse of wakes produced. Particularly, we are interested with the influence of the foil flexibility on these wakes. We define a 2D phase space (frequency and amplitude of the flapping), in which we identify three main flow regimes, associated with three vortices wake type. The PIV technique allows us to precisely analyse and quantify the physical and geometrical parameters of the observed wakes. The mean force is estimated for each regime, using a standard momentum balance. We localise then the drag-propulsion transition in our phase space. We show that the propulsive performance of flexible foils is superior to that of the rigid foil, and we suggest some explanations to explain this result.
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Submitted on : Monday, April 11, 2011 - 11:26:16 AM
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Catherine Marais. Dynamique tourbillonnaire dans le sillage d'un aileron oscillant : Propulsion par ailes battantes biomimétiques. Mécanique des structures [physics.class-ph]. Université Paris-Diderot - Paris VII, 2011. Français. ⟨pastel-00584901⟩

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