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Noise simulations of flap devices for wind turbine rotors

Suryadi, Alexandre and Schmidt, Florian Nils and Appel, Christina and Reiche, Nils and Ewert, Roland and Herr, Michaela and Wild, Jochen (2022) Noise simulations of flap devices for wind turbine rotors. Wind Energy, n/a (n/a), pp. 1-21. Wiley. doi: 10.1002/we.2784. ISSN 1095-4244.

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Official URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/we.2784


The rotor of a large diameter wind turbine experiences more substantial and more dynamic loads due to the fluctuating and heterogeneous wind field. The project SmartBlades 2.0 investigated rotor blade design concepts that alleviate aerodynamic loading using active and passive mechanisms. The present work evaluates the acoustics of the two load alleviating concepts separately, an inboard slat and an outboard flap, using the Fast Random Particle Mesh/Fast Multipole Code for Acoustic Shielding (FRPM/FMCAS) numerical prediction toolchain developed at DLR with input from the averaged flow field from RANS. The numerical tools produce a comparable flap side-edge noise spectrum with that of the measurement conducted in the Acoustic Wind Tunnel Braunschweig (AWB). The validated FRPM/FMCAS was then used to analyze the self-noise from a slat at the inboard section of a rotor blade with a 44.45m radius and compared with that from the outboard trailing edge. Furthermore, the rotational effect of the rotor was included in the post-processing to emulate the noise observed at ground level. The findings show an increase in the slat's overall sound pressure level and a maximum radiation upwind of the wind turbine for the case with the largest wind speed that represents the off-design condition. In operational conditions, the slat adds at most 2dB to the overall sound pressure level. The toolchain evaluates wind turbine noise with conventional or unconventional blade design, and the problem can be scaled up for a full-scale analysis. As such, the tools presented can be used to design low-noise wind turbines efficiently.

Item URL in elib:https://elib.dlr.de/189143/
Document Type:Article
Additional Information:Funded by the German Ministry for Economic Affairs and Energy (BMWi). Grant number: 0324032D
Title:Noise simulations of flap devices for wind turbine rotors
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Suryadi, AlexandreUNSPECIFIEDhttps://orcid.org/0000-0002-5129-5510UNSPECIFIED
Schmidt, Florian NilsUNSPECIFIEDhttps://orcid.org/0000-0002-5537-7214UNSPECIFIED
Herr, MichaelaUNSPECIFIEDhttps://orcid.org/0009-0000-7275-7078154899509
Wild, JochenUNSPECIFIEDhttps://orcid.org/0000-0002-2303-3214UNSPECIFIED
Date:22 September 2022
Journal or Publication Title:Wind Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-21
Keywords:numerical, wind turbine noise
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Photovoltaics and Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Wind Energy
Deposited By: Suryadi, Alexandre
Deposited On:01 Nov 2022 11:22
Last Modified:07 Mar 2024 18:58

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