Numerical Investigation of Broadband Slat Noise Attenuation with Acoustic Liner Treatment

Abstract

The acoustic field produced by broadband noise sources around the slat of a high-lift wing model is predicted using a hybrid method based on a large eddy simulation of the compressible flow for the noise generation and acoustic perturbation equation calculations for the acoustic propagation. The potential for noise attenuation using acoustic liners within the slat gap region of the high-lift wing is investigated by solving the acoustic perturbation equations with a broadband time-domain impedance boundary condition, and the acoustic liner conditions are applied on the slat cove surface and the main element. Results show that attenuation of the broadband noise is obtained with the acoustic liner treatment in the slat gap region.