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Contribution a l'étude aérodynamique d'une éolienne par une méthode de sillage libre

Abstract : This thesis presents a method for calculating the unsteady three-dimensional flow around a wind turbine rotor. The real flow is replaced by a free stream past a vortex model of the rotor. This model consists of lifting vortex lines which replace the blades and a trailing free vorticity. For simplicity the vorticity shed from the blade trailing edge is concentrated in two vortices issued from tip and root. To compute the resulting flow and to evaluate the unsteady forces exerted on the rotor, a free wake method is used. This method consists of a Lagrangian representation of the flow field. The evolution of the wake downstream of the rotor is obtained by tracking the markers representing the vortices issued from the blade tips and roots. To solve the wake governing equation and to obtain the marker positions, a time-marching method is applied and the solution is obtained by a second order predictor-corrector scheme. The free wake methods are usually inviscid, but in the present approach, the viscous effects are taken into account. It is supposed that the induced velocity on vortex line is limited by a maximum velocity in the viscous vortex core. The diffusion of the vortex lines and the vortex core growth are supposed to depend on vortex age. All constants needed to represent the viscosity effects are extracted from experiments. To validate the proposed method a comparison is made with experimental data obtained in the case of a model of wind turbine where the flow field immediately behind the rotor is measured by means of particle image velocimetry (PIV). It is shown that the numerical simulation captures correctly the near wake development.
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https://pastel.archives-ouvertes.fr/pastel-00510801
Contributor : Said Chkir <>
Submitted on : Saturday, August 21, 2010 - 8:55:04 AM
Last modification on : Friday, July 17, 2020 - 2:56:29 PM
Long-term archiving on: : Thursday, December 1, 2016 - 10:37:56 AM

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  • HAL Id : pastel-00510801, version 1

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Said Chkir. Contribution a l'étude aérodynamique d'une éolienne par une méthode de sillage libre. Mécanique des fluides [physics.class-ph]. Arts et Métiers ParisTech, 2010. Français. ⟨NNT : 2010ENAM0025⟩. ⟨pastel-00510801⟩

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