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Aeroacoustic Evaluation of Low-Noise Wind Turbine Blade Tips

Herr, Michaela and Rohardt, Claas-Hinrik and Faßmann, Benjamin and Pereira Gomes, Jorge Miquel and Appel, Christina (2019) Aeroacoustic Evaluation of Low-Noise Wind Turbine Blade Tips. 23rd International Congress on Acoustics, ICA 2019, 09.-13. September 2019, Aachen, Deutschland.

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Official URL: http://www.ica2019.org/technical-program/

Abstract

The contribution provides an overview on accomplished wind tunnel testing and simulation activity within the German national wind energy project BELARWEA. The project aimed at numerical tool development and validation to support the design of both aerodynamically efficient and low-noise wind turbine rotors. The focus was set on the tip region, herein defined as the outer 20 % of the rotor radius, i.e. addressing noise generation from the trailing-edge- and tip vortex regions. Aeroacoustically driven 2D profile design, 3D winglet design and 2D/3D CFD/CAA analysis were supplemented by the transfer of passive noise reduction technologies from aerospace applications to wind turbine blades. Validation experiments were performed in systematic evaluation steps, namely - at 2D blade sections in the Acoustic Wind-Tunnel Braunschweig (AWB) of DLR, and - at 3D blade tip models in the larger acoustic facility DNW-NWB, operated by the German-Dutch Wind Tunnels foundation. A noise reduction potential of up to 8 dB could be demonstrated in the NWB experiment, confirming the previously documented AWB results. The overall reduction was composed of a 2-4 dB reduction by a new low-noise profile design RoH-W-18%c37 (relative to a NACA 64-618 reference configuration) and an additional ~4-6-dB reduction by brush add-ons.

Item URL in elib:https://elib.dlr.de/132040/
Document Type:Conference or Workshop Item (Speech)
Title:Aeroacoustic Evaluation of Low-Noise Wind Turbine Blade Tips
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Herr, MichaelaMichaela.Herr (at) dlr.deUNSPECIFIED
Rohardt, Claas-HinrikClaas-Hinrik.Rohardt (at) dlr.deUNSPECIFIED
Faßmann, BenjaminBenjamin.Fassmann (at) dlr.deUNSPECIFIED
Pereira Gomes, Jorge MiquelJorge.Gomes (at) dlr.deUNSPECIFIED
Appel, ChristinaChristina.Appel (at) dlr.deUNSPECIFIED
Date:9 September 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:noise reduction technologies, trailing-edge noise, noise reduction, brushes, numerical predictions, validation experiments, wind turbine noise, low-noise profile design
Event Title:23rd International Congress on Acoustics, ICA 2019
Event Location:Aachen, Deutschland
Event Type:international Conference
Event Dates:09.-13. September 2019
Organizer:European Acoustics Association (EAA)
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
Deposited By: Herr, Michaela
Deposited On:09 Dec 2019 15:13
Last Modified:09 Dec 2019 15:13

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