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Erschienen in:

2018 | OriginalPaper | Buchkapitel

Noise Reduction Technologies for Wind Turbines

verfasst von : Michaela Herr, Roland Ewert, Benjamin Faßmann, Christof Rautmann, Susanne Martens, Claas-Hinrik Rohardt, Alexandre Suryadi

Erschienen in: New Results in Numerical and Experimental Fluid Mechanics XI

Verlag: Springer International Publishing

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Abstract

Results from a numerical and experimental aeroacoustic assessment of 2D wind turbine blade sections are presented. CFD/CAA-based predictions using a synthetic turbulence method were conducted at a NACA 64-618 profile as well as at a new low-noise airfoil design RoH-W-18%c37. Validation experiments were performed in DLR’s Acoustic Wind-Tunnel Braunschweig (AWB) for varying transition locations. A trailing-edge noise reduction benefit of 2–4 dB in overall sound pressure level was predicted for the new airfoil under design conditions. A large laminar extent of the boundary layer significantly reduces the noise emission (by up to 8 dB) compared to equivalent cases with forced transition at the leading edge. An additional noise reduction (with realistic reductions of the peak levels by 4–6 dB) was accomplished by flow-permeable trailing-edge extensions which were successfully transferred to the two profiles from forerunner aerospace-related studies.

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Vorheriges Kapitel Overset-LES with Stochastic Forcing for Sound Source Simulation

Nächstes Kapitel Numerical Simulation of the Sound Generation and the Sound Propagation from Air Intakes in an Aircraft Cabin

The German acronym BELARWEA (“Blattspitzen für Effiziente und LärmArme Rotoren von WindEnergieAnlagen”) stands for “blade tips for efficient and low-noise wind turbine rotors”.

DNW: German-Dutch Wind-Tunnels (Deutsch-Niederländische Windkanäle); NWB: Low-Speed Wind-Tunnel Braunschweig (Niedergeschwindigkeits-Windkanal Braunschweig).

An exact number cannot be provided here because the NREL 5-MW model rotor is defined in terms of blade elements, i.e. areas of intermediate profiles are not explicitly indicated.

Note that the (offshore) NREL 5-MW model rotor is not representative for typical onshore wind turbines. In a classical 2D experiment these selected conditions are realizable in DNW-NWB.

Choudhari, M., Bahr, C., Khorrami, M., Lockard, D., Lopes, L., Zawodny, N., Herr, M., Pott-Pollenske, M., Kamruzzaman, M., van de Ven, T., Manoha, E., Redonnet, S., Yamamoto, K., Ikeda, T., Imamura, T.: Simulations & measurements of airframe noise: a BANC workshops perspective. In: Proceedings of NATO STO-MP-AVT-246 Specialists Meeting on Progress and Challenges in Validation Testing for Computational Fluid Dynamics, Avila, Spain, 26–28 September 2016

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Herr, M.: Trailing-Edge Noise—Reduction Concepts and Scaling Laws. Dissertation, Technical University Braunschweig, Germany, DLR report 2013-32, ISSN 1434-8454, ISRN DLR-FB-2013-32, September 2013

Herr, M., Kamruzzaman, M.: Benchmarking of Trailing-Edge Noise Computations—Outcome of the BANC-II Workshop. AIAA Paper AIAA 2013-2123, May 2013

Herr, M. Rossignol, K.-S., Delfs, J., Mößner, M., Lippitz, N.: Specification of Porous Materials for Low-Noise Trailing-Edge Applications. AIAA Paper AIAA 2014-3041, June 2014

Herr, M., Ewert, R., Rautmann, C., Kamruzzaman, M., Bekiropoulos, D., Iob, A., Arina, R., Batten, P., Chakravarthy, S., Bertagnolio, F.: Broadband Trailing-Edge Noise Predictions—Overview of BANC-III Results. AIAA Paper AIAA 2015-2847, June 2015

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Rautmann, C.: Numerical simulation of wind turbine trailing-edge noise. Dissertation, Technical University Braunschweig, Germany, DLR report 2017-35, ISSN 7434-8454, ISRN DLR-FB-2017-35, August 2017 (2017)

Titel: Noise Reduction Technologies for Wind Turbines
verfasst von: Michaela Herr
Roland Ewert
Benjamin Faßmann
Christof Rautmann
Susanne Martens
Claas-Hinrik Rohardt
Alexandre Suryadi
Verlag: Springer International Publishing
Buch: New Results in Numerical and Experimental Fluid Mechanics XI
Print ISBN: 978-3-319-64518-6

Electronic ISBN: 978-3-319-64519-3

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-64519-3_55

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