Effect of Leading Edge serrations in reducing aerofoil noise near stall conditions

This paper aims at evaluating the possibility of reducing the noise generated by the separated flow over an aerofoil, due to conditions near to or of stall, by the introduction of serrations on its leading edge. First of all the onset of the separation on the aerofoil surface and the associated noise have been investigated. Different serration geometries as regards wavelength and height are considered, in order to identify the configuration which performs the best in terms of noise