Print Email Facebook Twitter Acoustic Emissions of Semi-Permeable Trailing Edge Serrations Title Acoustic Emissions of Semi-Permeable Trailing Edge Serrations Author Arce Leon, C.A. (TU Delft Aerodynamics) Merino Martinez, R. (TU Delft Aircraft Noise and Climate Effects) Pröbsting, S. (TU Delft Wind Energy) Ragni, D. (TU Delft Wind Energy) Avallone, F. (TU Delft Wind Energy) Date 2017-05-22 Abstract The trailing edge of a NACA 0018 airfoil is modified through the attachment of serrations with different degrees of permeability. Acoustic beamforming is used to inspect the turbulent boundary layer-trailing edge noise emissions from the unmodified and serrated trailing edges. Different freestream velocities and angles of attack are investigated. The serration permeability is prescribed by having slits cut into the solid surface of the serrations in two different configurations. The results indicate that a certain benefit in noise reduction is obtained from a mixed solid/slitted configuration, while a fully slitted configuration loses most of the noise reduction performance. Subject AeroacousticsTrailing edge serrationsAcoustic beamforming To reference this document use: http://resolver.tudelft.nl/uuid:407ac413-2397-431c-b784-9f6e4a9c521b DOI https://doi.org/10.1007/s40857-017-0093-8 ISSN 1839-2571 Source Acoustics Australia, 46 (1), 111-117 Part of collection Institutional Repository Document type journal article Rights © 2017 C.A. Arce Leon, R. Merino Martinez, S. Pröbsting, D. Ragni, F. Avallone Files PDF 10.1007_s40857_017_0093_8.pdf 1.77 MB Close viewer /islandora/object/uuid:407ac413-2397-431c-b784-9f6e4a9c521b/datastream/OBJ/view