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Identifying the Flap Side-Edge Noise Contribution of a Wind Turbine Rotor Section with an Active Trailing-Edge

Suryadi, Alexandre and Jätz, Christoph and Seume, Jörg R. and Herr, Michaela (2021) Identifying the Flap Side-Edge Noise Contribution of a Wind Turbine Rotor Section with an Active Trailing-Edge. International Conferences on Wind Turbine Noise, 16-18 May 2021, e-conference.

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Abstract

Active trailing-edge technology is a promising application for localized load alleviation of large-diameter wind turbine rotors, accomplished using one or more control surfaces in the rotor blade’s outer region. This work focuses on identifying noise contributions from the flap side-edge and the trailing edge in a laboratory condition. Measurements were conducted in the Acoustic Wind tunnel Braunschweig (AWB) at the German Aerospace Center’s (DLR) Braunschweig site. The small-scale model has a span of 1200 mm and a chord of 300 mm. The control surface, a plain flap, has a span of 400 mm and a chord length of 90 mm. Far-field noise was measured using a phased-microphone array for various flow speeds, angles of attack and flap deflection angles. For sound source identification, two noise reduction addons were installed interchangeably: trailing-edge brush and flap side-edge porous foam. Analysis of the far-field noise reveals that, while changes to the flap deflection angle alter the far-field noise spectra, the trailing-edge noise remains the predominant noise source at deflection angles −5° and 5° . No additional noise level was observed from the flap side-edge within the measurable frequency range at these angles. The flap side-edge noise has an increased role for frequency larger than 2 kHz for the larger flap deflection angles of −10° and 10° . Furthermore, numerical reproduction of the results will also be presented using the FMCAS (Fast Multipole Code for Acoustic Shielding) toolchain developed at DLR.

Item URL in elib:https://elib.dlr.de/147214/
Document Type:Conference or Workshop Item (Lecture)
Title:Identifying the Flap Side-Edge Noise Contribution of a Wind Turbine Rotor Section with an Active Trailing-Edge
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Suryadi, AlexandreUNSPECIFIEDhttps://orcid.org/0000-0002-5129-5510UNSPECIFIED
Jätz, ChristophForWind/Leibniz University HannoverUNSPECIFIEDUNSPECIFIED
Seume, Jörg R.ForWind/Leibniz University HannoverUNSPECIFIEDUNSPECIFIED
Herr, MichaelaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:16 May 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:laboratory acoustic measurement of a section of a wind turbine blade with a flap element to control aerodynamic load
Event Title:International Conferences on Wind Turbine Noise
Event Location:e-conference
Event Type:international Conference
Event Dates:16-18 May 2021
Organizer:INCE Europe
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 > Technical Acoustics
Deposited By: Suryadi, Alexandre
Deposited On:13 Dec 2021 08:27
Last Modified:13 Dec 2021 08:27

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