Trailing edge serrations: Effect of their flap angle on flow and acoustics

Carlos Arce Leon, Roberto Merino Martinez, Daniele Ragni, Stefan Pröbsting, Francesco Avallone, A. Singh, Jesper Madsen

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientific

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Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed
Original languageEnglish
Title of host publication7th International Conference on Wind Turbine Noise
Subtitle of host publicationRotterdam – 2nd to 5th May 2017
Number of pages16
Publication statusPublished - 2017
Event7th International Conference on Wind Turbine Noise: Wind Turbine Noise 2017 - Willem Burger Complex, Rotterdam, Netherlands
Duration: 2 May 20175 May 2017
Conference number: 7


Conference7th International Conference on Wind Turbine Noise
Internet address


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