Coupling of an aeroacoustic model and a parabolic equation code for long range wind turbine noise propagation

被引:21
作者
Cotte, B. [1 ]
机构
[1] Univ Paris Saclay, EDF, CEA, CNRS,ENSTA ParisTech,IMSIA, 828bd Marechaux, F-91120 Palaiseau, France
关键词
Wind turbine noise; Parabolic equation; Atmospheric propagation; Aeroacoustic sources; Point source approximation; INHOMOGENEOUS MOVING-MEDIA; SOUND-PROPAGATION; PREDICTION; ATMOSPHERE; WAVES;
D O I
10.1016/j.jsv.2018.02.026
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This study proposes to couple a source model based on Amiet's theory and a parabolic equation code in order to model wind turbine noise emission and propagation in an inhomogeneous atmosphere. Two broadband noise generation mechanisms are considered, namely trailing edge noise and turbulent inflow noise. The effects of wind shear and atmospheric turbulence are taken into account using the Monin-Obukhov similarity theory. The coupling approach, based on the backpropagation method to preserve the directivity of the aeroacoustic sources, is validated by comparison with an analytical solution for the propagation over a finite impedance ground in a homogeneous atmosphere. The influence of refraction effects is then analyzed for different directions of propagation. The spectrum modification related to the ground effect and the presence of a shadow zone for upwind receivers are emphasized. The validity of the point source approximation that is often used in wind turbine noise propagation models is finally assessed. This approximation exaggerates the interference dips in the spectra, and is not able to correctly predict the amplitude modulation. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:343 / 357
页数:15
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