Flow topology and acoustic emissions of trailing edge serrations at incidence

Carlos Arce León, Daniele Ragni, Stefan Pröbsting, Fulvio Scarano, Jesper Madsen

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)
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Abstract

The flow past a NACA 0018 airfoil with sawtooth trailing edge serrations has been investigated using stereoscopic particle image velocimetry (PIV). The serration flap angle and airfoil incidence are varied in order to study the effect of secondary flow establishing between the suction and pressure sides of the serrations. The flow topology around the serrations is inferred from the analysis of time-averaged streamlines close to the airfoil surface and from the wall-normal flow velocity in between serrations. Additional PIV measurements with a plane in cross-flow highlight the formation of streamwise vortex pairs. The flow behavior is further characterized in terms of its turbulence statistics. Noise emissions are measured with an acoustic phased array in combination with beamforming. The serrations are found to be effective in reducing noise, and their application is studied for different degrees of airfoil incidence and serration flap angle.
Original languageEnglish
Article number91
Number of pages17
JournalExperiments in Fluids: experimental methods and their applications to fluid flow
Volume57
DOIs
Publication statusPublished - 2016

Keywords

  • Particle image velocimetry
  • Aeroacoustics
  • Serrated trailing
  • edges

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