On the noise reduction mechanism of a flat plate serrated trailing edge at low-to-moderate Reynolds number

Abstract

<4:2 10 ). Acoustic and aerodynamic measurementshave been taken using a at plate with both sharp and serrated trailing edges in theanechoic wind tunnel at the University of Adelaide. Trailing edge serrations are foundto achieve up to 13 dB of attenuation in the narrowband noise levels without modifyingthe directivity of the radiated noise. The noise reduction achieved with trailing edgeserrations is found to be dependent on their geometrical wavelength and Strouhal number,St