Print Email Facebook Twitter Trailing edge serrations Title Trailing edge serrations: Effect of their flap angle on flow and acoustics Author Arce Leon, C.A. (LM Wind Power R&D) Merino Martinez, R. (TU Delft Aircraft Noise and Climate Effects) Ragni, D. (TU Delft Wind Energy) Pröbsting, S. (TU Delft Wind Energy) Avallone, F. (TU Delft Wind Energy) Singh, A. (LM Wind Power) Madsen, Jesper (LM Wind Power) Date 2017 Abstract 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 To reference this document use: http://resolver.tudelft.nl/uuid:73a62aac-c502-4791-917b-38ad2d0cccf5 Source 7th International Conference on Wind Turbine Noise: Rotterdam – 2nd to 5th May 2017 Event 7th International Conference on Wind Turbine Noise, 2017-05-02 → 2017-05-05, Willem Burger Complex, Rotterdam, Netherlands Part of collection Institutional Repository Document type conference paper Rights © 2017 C.A. Arce Leon, R. Merino Martinez, D. Ragni, S. Pröbsting, F. Avallone, A. Singh, Jesper Madsen Files PDF Trailing_Edge_Serrations_ ... _Angle.pdf 2.6 MB Close viewer /islandora/object/uuid:73a62aac-c502-4791-917b-38ad2d0cccf5/datastream/OBJ/view