Numerical study on combed teeth serrations for wind turbine noise reduction

Wouter van der Velden, Stefan Oerlemans

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

This study investigates the flow topology and noise emission from a wind turbine airfoil with combed serration trailing edge geometry, to understand the noise reduction observed in earlier experiments. A comparison is made to a straight trailing edge and a serrated trailing edge without combs. The different trailing edges are retrofitted to a cambered airfoil at design angle of attack. The flow field is analyzed by evaluating the fully explicit, transient, compressible Lattice Boltzmann equation. The acoustic far field is obtained by means of the Ffowcs-Williams and Hawkings integral solution, Curle's integral solution, and a direct probe solution. The simulated mean pressure distribution matches earlier wind tunnel experiments (obtained from the Virginia Tech anechoic facility) well. Furthermore, the numerical results confirm that the combed serrations give a larger noise reduction than the standard serration. Both trailing edge geometries show similar acoustic trends as the experiments, giving confidence in the numerical results
Original languageEnglish
Title of host publication23rd AIAA/CEAS Aeroacoustics Conference
Subtitle of host publication5-9 June 2017, Denver, Colorado
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages14
ISBN (Electronic)978-1-62410-504-3
DOIs
Publication statusPublished - 2017
Event23rd AIAA/CEAS Aeroacoustics Conference - Denver, United States
Duration: 5 Jun 20179 Jun 2017
Conference number: 23
https://doi.org/10.2514/MAA17

Conference

Conference23rd AIAA/CEAS Aeroacoustics Conference
CountryUnited States
CityDenver
Period5/06/179/06/17
Internet address

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