Influence of blade deflections on wind turbine noise directivity

Journal article (2022)

Authors

A. P.C. Bresciani Centre Scientifique Et Technique Du Bâtiment (CSTB), Siemens Industry Software NV, University of Twente
U. Boatto Siemens Industry Software N.V., Flow Physics and Technology
S. Le Bras Siemens Industry Software NV
Jean-Paul Bonnet Siemens Industry Software N.V.
L. D. De Santana University of Twente
Department
Flow Physics and Technology
Copyright: © 2022 A. P.C. Bresciani, U. Boatto, S. Le Bras, P. Bonnet, L. D. De Santana
DOI: https://doi.org/10.1088/1742-6596/2257/1/012012
More Info
expand_more

Published Date

2022

Language

English

Department

Flow Physics and Technology

Abstract

This paper establishes the effect of blade deflections on wind turbine noise directivity. Fast turn-around methods are used in a framework of integrated aeroelastic and aeroacoustic simulations: the blade element momentum theory is coupled with a RANS-informed Amiet's model for the aeroacoustic modelling of trailing-and leading-edge noise. This approach is applied to the NREL 5 MW wind turbine and the results of rigid and flexible blades are compared. The overall sound pressure level computed with flexible blades increases up to 13 dBA for listeners close to the rotor plane. This effect is attributed to the flapwise angular deflection of the wind turbine blade. Furthermore, the symmetry of the results with respect to the rotor plane is lost when the flapwise deflection is considered, indicating that the modelling of this rotation is of fundamental importance for the acoustic simulation.