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Low-Noise Technologies for Wind Turbine Blades

Herr, Michaela and Ewert, Roland and Faßmann, Benjamin and Rautmann, Christof and Martens, Susanne and Rohardt, Claas-Hinrik and Suryadi, Alexandre (2018) Low-Noise Technologies for Wind Turbine Blades. Journal of Sound and Vibration, 427, pp. 201-202. Elsevier. DOI: 10.1016/j.jsv.2017.10.016 ISSN 0022-460X

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Official URL: https://www.sciencedirect.com/science/article/pii/S0022460X1730740X


Broadband trailing-edge scattering noise (TEN) represents a canonical source mechanism that expresses in a wide range of technical situations like the noise generation at aircraft high-lift systems, at turbomachinery components, cooling fans or wind turbine blades. At modern wind turbines TEN as generated in the outer 20-25% of the rotor radius constitutes the most relevant noise contributor. The German national wind energy project BELARWEA (BMWi ref. 0325726) aims at the development and validation of improved methods to support the design of both efficient and low-noise wind turbine rotors. 2D CFD/CAA-based predictions with 4D stochastic source reconstruction using the Fast Random Particle-Mesh Method (FRPM) were successfully applied to predict the TEN emission of a newly designed wind turbine blade profile RoH-W-18%c37. Corresponding validation results are shown for varying test angles-of-attack and turbulent boundary-layer transition locations. When transposing these results to approximate operational conditions (here: to conditions at the outer rotor portion of a small-scaled experimental turbine), the new airfoil design is expected to bring about an overall 2-4 dB TEN reduction when compared to a NACA 64-618 reference profile. The noise emission of such an aeroacoustically driven design can be further significantly reduced by the adaptation of TEN reduction concepts known from aerospace-related studies (porous, slotted or brush-type extensions) to the new application conditions. Compared to standard trailing-edge serrations as currently applied at todays' wind turbine rotors, the proposed concepts appear less susceptible to excess noise generation.

Item URL in elib:https://elib.dlr.de/116354/
Document Type:Article
Title:Low-Noise Technologies for Wind Turbine Blades
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Herr, Michaelamichaela.herr (at) dlr.deUNSPECIFIED
Ewert, RolandRoland.Ewert (at) dlr.deUNSPECIFIED
Faßmann, BenjaminBenjamin.Fassmann (at) dlr.deUNSPECIFIED
Rautmann, ChristofChristof.Rautmann (at) dlr.deUNSPECIFIED
Martens, SusanneSusanne.Martens (at) dlr.deUNSPECIFIED
Rohardt, Claas-HinrikClaas-Hinrik.Rohardt (at) dlr.deUNSPECIFIED
Suryadi, AlexandreAlexandre.Suryadi (at) dlr.deUNSPECIFIED
Date:August 2018
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jsv.2017.10.016
Page Range:pp. 201-202
Wilson, Alexander G.ISVR, University of Southampton
Series Name:Aeroacoustics Research in Europe: The CEAS-ASC Report on 2016 Highlights
Keywords:wind turbine noise, wind energy, aeroacoustics, low-noise profile design, trailing-edge noise, rotor self-noise reduction and prediction, CAA, BMWi-project BELARWEA
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes: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 > Technical Acoustics
Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Herr, Michaela
Deposited On:14 Dec 2018 13:57
Last Modified:31 Jul 2019 20:13

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