Aerodynamic noise of a two-dimensional wing with high-lift devices

Abstract

This paper concerns the experimental characterization of the aerodynamic noise of a two-dimensional 1/11 scale wing, supplied with a leading-edge slat and a trailing-edge flap. Three configurations are depicted, takeoff, cruise and landing. The experimental results are analyzed for the noisiest configuration, that is landing. Two noise sources, localized in the slat-wing slot and the wing-flap slot, are displayed. Sound is preferentially radiated from the wing pressure side. Moreover radiation from the wing-flap slot and from the flap trailing-edge are shown to interfer in far field. In parallel to the experimental study, an attempt is made to represent the wingflap noise radiation with the help of existing analytical theories.