Influence of blade deflections on wind turbine noise directivity

A. P.C. Bresciani; U. Boatto; S. Le Bras; P. Bonnet; L. D. De Santana

doi:10.1088/1742-6596/2257/1/012012

Influence of blade deflections on wind turbine noise directivity

A. P.C. Bresciani^*, U. Boatto, S. Le Bras, P. Bonnet, L. D. De Santana

^*Corresponding author for this work

Flow Physics and Technology

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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.

Original language	English
Article number	012012
Number of pages	13
Journal	Journal of Physics: Conference Series
Volume	2257
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/2257/1/012012
Publication status	Published - 2022
Event	WindEurope Annual Event 2022 Conference - Bilbao, Spain Duration: 5 Apr 2022 → 7 Apr 2022

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10.1088/1742-6596/2257/1/012012

Bresciani_2022_J._Phys. _Conf._Ser._2257_012012Final published version, 1.42 MBLicence: CC BY

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title = "Influence of blade deflections on wind turbine noise directivity",

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author = "Bresciani, {A. P.C.} and U. Boatto and {Le Bras}, S. and P. Bonnet and {De Santana}, {L. D.}",

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journal = "Journal of Physics: Conference Series",

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T1 - Influence of blade deflections on wind turbine noise directivity

AU - Bresciani, A. P.C.

AU - Boatto, U.

AU - Le Bras, S.

AU - Bonnet, P.

AU - De Santana, L. D.

PY - 2022

Y1 - 2022

N2 - 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.

AB - 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.

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T2 - WindEurope Annual Event 2022 Conference

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Influence of blade deflections on wind turbine noise directivity

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