University of Cambridge > > Waves Group (DAMTP) > Downstream porosity for the Reduction of Turbulence-Aerofoil Interaction Noise

Downstream porosity for the Reduction of Turbulence-Aerofoil Interaction Noise

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If you have a question about this talk, please contact Alistair Hales.

The presentation is predominantly based on an experimental study 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 locating it directly at the leading edge where most of the lift is generated. Noise measurements on a flat plate with downstream porosity will be compared against the case of two tandem flat plates. In both cases, the noise reduction spectra exhibit peaks of strong noise reduction at non-dimensional 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 reductions with downstream porosity

This talk is part of the Waves Group (DAMTP) series.

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