Acoustic Emissions of Semi-Permeable Trailing Edge Serrations

Carlos Arce Leon, Roberto Merino Martinez, Stefan Pröbsting, Daniele Ragni, Francesco Avallone

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
34 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)111-117
Number of pages7
JournalAcoustics Australia
Volume46
Issue number1
DOIs
Publication statusE-pub ahead of print - 22 May 2017

Keywords

  • Aeroacoustics
  • Trailing edge serrations
  • Acoustic beamforming

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