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Étude des phénomènes tourbillonnaires dans le sillage éolien

Abstract : During operation, each blade of a wind turbine emits a vortex sheet from the trailing edge along its span and a tip vortex from its extremity. Thus, these vortex structures evolve behind the rotor and can impact wind turbines located downstream. This thesis presents an experimental and a numerical approach to study these structures. In the experimental approach, the wake of a three-bladed rotor is explored in the wind tunnel of Arts et Métiers ParisTech using PIV technique. These explorations have yielded the velocity field in several planes of azimuth. A new method based on the calculation of circulation has been proposed to locate vortex centers in the explored plans and to calculate their intensity. In the numerical approach, a method for coupling Navier-Stokes simulation with a vortex wake model is proposed. The coupled model allows restricting the computational domain in the vicinity of the rotor with the possibility of defining the boundary conditions by the vortex model. A sensitivity analysis was performed in order to determine the number of steps required in the vortex model to achieve the desired accuracy. Thus, the possibility of restricting the computational domain offered by this method allows to build a finer mesh around the profiles and to put all the available computing capacity to reveal the genesis of the wake at high resolution. This coupled model also allows to study the effect of blade characteristics on the formation of the wake and to improve the design and optimization of wind rotors.
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Contributor : Christophe Maalouf Connect in order to contact the contributor
Submitted on : Sunday, February 13, 2011 - 5:18:30 PM
Last modification on : Friday, October 23, 2020 - 4:38:37 PM
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  • HAL Id : pastel-00565514, version 1



Christophe Bassem Maalouf. Étude des phénomènes tourbillonnaires dans le sillage éolien. Mécanique des fluides [physics.class-ph]. Arts et Métiers ParisTech, 2010. Français. ⟨NNT : 2010ENAM0029⟩. ⟨pastel-00565514⟩



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