Wind Turbine Noise Propagation Modelling: An Unsteady Approach

The Science of Making Torque from Wind

Barlas, E.^1 ; Zhu, W.J.^1 ; Shen, W.Z.^1 ; Andersen, S.J.^1

DTU Wind Energy, Technical University of Denmark, Kongens Lyngby

2800, Denmark^1

关键词: Acoustic simulations;    Modulation characteristics;    Parabolic equation;    Sound pressure level;    Time dependent source;    Turbulence intensity;    Wind turbine noise;    Wind turbine sounds;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/2/022003/pdf
DOI  :  10.1088/1742-6596/753/2/022003

来源: IOP

【 摘 要 】

Wind turbine sound generation and propagation phenomena are inherently time dependent, hence tools that incorporate the dynamic nature of these two issues are needed for accurate modelling. In this paper, we investigate the sound propagation from a wind turbine by considering the effects of unsteady flow around it and time dependent source characteristics. For the acoustics modelling we employ the Parabolic Equation (PE) method while Large Eddy Simulation (LES) as well as synthetically generated turbulence fields are used to generate the medium flow upon which sound propagates. Unsteady acoustic simulations are carried out for three incoming wind shear and various turbulence intensities, using a moving source approach to mimic the rotating turbine blades. The focus of the present paper is to study the near and far field amplitude modulation characteristics and time evolution of Sound Pressure Level (SPL).