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SUMMARY:Downstream porosity for the Reduction of Turbulence-Aerofoil Inter
 action Noise - Sergi Palleja-Cabre
DTSTART:20220530T140000Z
DTEND:20220530T150000Z
UID:TALK174218@talks.cam.ac.uk
CONTACT:Alistair Hales
DESCRIPTION:The presentation is predominantly based on an experimental stu
 dy into the use of porosity located downstream of an aerofoil leading edge
  for the reduction of turbulence interaction noise. Locating the porosity 
 well away from the leading edge has been shown in the literature to cause 
 a much lower negative impact on aerodynamic performance compared with loca
 ting it directly at the leading edge where most of the lift is generated. 
 Noise measurements on a flat plate with downstream porosity will be compar
 ed against the case of two tandem flat plates. In both cases\, the noise r
 eduction spectra exhibit peaks of strong noise reduction at non-dimensiona
 l frequencies that require an additional mechanism in which a phase shift 
 of 180 degrees is introduced in the interaction process. The presentation 
 will discuss a possible mechanism by which this phase inversion occurs and
  outline a simple analytical model to predict qualitatively the noise redu
 ctions with downstream porosity
LOCATION:MR20
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