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Analyse expérimentale et simulation numérique de sections de pales pour application aux hydroliennes

Abstract : In a context of development of renewable energies, there is a growing interest in marine energies. Among them, tidal currents are promising due to the density of seawater and the predictability of tidal oscillations at a given location. For horizontal axis tidal turbines and according to the industrial partner, constraints at the blade section scale include bi-directionality of the flow, surface roughness and upstream turbulence. The first part of the present work studied two solutions to achieve bi-directionality of the flow at the blade section scale. A specific bi-directional hydrofoil was compared to a NACA 0015 in forward and reversed flow. The second part focussed on the effect of surface roughness and upstream turbulence on a unidirectional blade section designed for current turbines. Both studies were carried out on academic two-dimensional hydrofoils, using both numerical investigation and a specifically developed experimental approach. Computations using fully turbulent and transition models were compared to balance force measurements coupled with PIV flow observations. The bidirectional foil as well as the NACA foil in forward and reversed flow, showed specific behaviours that could considerably reduce their performances for a use as a tidal turbine rotor. Roughness height was also observed to deeply change the foil properties, beyond a critical height. Finally, upstream turbulence resulted in moderate performance changes, less significant at the machine scale.
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Submitted on : Tuesday, January 4, 2022 - 2:21:38 PM
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  • HAL Id : tel-03510192, version 1

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Jean-Baptiste Marchand. Analyse expérimentale et simulation numérique de sections de pales pour application aux hydroliennes. Mécanique des fluides [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2014. Français. ⟨NNT : 2014ENAM0038⟩. ⟨tel-03510192⟩

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