IMSIA, ENSTA ParisTech 828, boulevard des Mar´echaux 91120 Palaiseau

Avis de soutenance de th`ese Yuan TIAN

Modeling of wind turbine noise sources and propagation in the atmosphere La soutenance aura lieu le lundi 15 f´evrier 2016 a` 14h Salle 2.2.34 de l’ENSTA ParisTech Jury : Olivier Cadot Benjamin Cott´e Franc¸ois Coulouvrat Ir`ene Lauret Michel Roger Wen Zhong Shen

ENSTA ParisTech ENSTA ParisTech Universit´e Pierre et Marie Curie EDF EN ´ Ecole Centrale de Lyon Technical University of Denmark

Information pratique : Si vous souhaitez assister a` cette soutenance et que vous eˆ tes ext´erieur a` l’ENSTA ParisTech, merci d’envoyer un mail a` Benjamin Cott´e ([email protected]) afin que votre nom soit communiqu´e a` l’accueil.

Abstract The purpose of this work is to model wind turbine noise sources and propagation in the atmosphere, in order to better understand the characteristics of wind turbine noise at long range, and to help wind turbine manufacturers and wind farm developers meet the noise regulations. Broadband noises generated aerodynamically, namely turbulent inflow noise, trailing edge noise and separation/stall noise, are generally dominant for a modern wind turbine. Amiet’s analytical model is chosen to predict turbulent inflow noise and trailing edge noise. It is then applied on a full-size wind turbine to obtain the noise emission level in the near field. Cases with constant wind profiles and no turbulence are used first, then wind shear and atmospheric turbulence effects obtained from Monin-Obukhov similarity theory are included. Good agreements against field measurements are found when both turbulent inflow noise and trailing edge noise are considered. Classical features of wind turbine noise, such as directivity and amplitude modulation, are recovered by the calculations. Next, Amiet’s theory is coupled with propagation models to estimate noise immission level in the far-field. A method to couple the source model to a parabolic equation code is also proposed and validated to take into account atmospheric refraction effects. Depending on the propagation direction, noise levels vary because the ground effect is influenced by wind shear and the presence of the shadow zone in the upwind direction. Finally, the point source assumption is reviewed by considering numerical propagation models.