Développement d'un récupérateur d'énergie oscillant

Abstract : Energy harvesting is a common process presents in so many ways in nature. Fishes and birds use for example their surroundings in order to produce propulsion without any effort. The focus of this thesis is to design a hydro-aéro-elastic harvester based on these dynamics. The fluid-structure interaction is introduced to explain the energy supply of the concept. An oscillating-wing-mechanism is theoretically and numerically developed in the aim to investigate the behavior of the marine-wind turbine. The energetic efficiency is then maximized by the asymmetric oscillations relative to the fluid-structure coupling. Note that the non-symmetric characteristic of the oscillation is included in the theory of Couchet which completes the unsteady aerodynamic theory of Theodorsen. Unusual high performances of the oscillating harvester suggest some apprehensions reading the efficiency’s definition. Indeed, the hydro-aéro-elastic harvester optimization can be achieved ether by increasing the power output or by decreasing the power available in the fluid artificially modified by the sweep section of the foil. These uncertainties are resolved by considering another definition of the energetic efficiency which is developed according to the theory of Couchet. The performance analysis of the new factor presents the contribution of the wake induced by the asymmetric oscillation of the foil on the energy harvesting quantities.
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Sylvain Costa. Développement d'un récupérateur d'énergie oscillant. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2019. Français. ⟨NNT : 2019ESMA0011⟩. ⟨tel-02353308⟩

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