Analysis and modelling of wake-airfoil interaction aeroacoustics

Abstract

© 2024, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.Motivated by the problem of the sound generated by the interaction of a landing-gear wake with a deployed flap, we investigate the flow and sound fields generated by the interaction of a cylinder wake and a downstream airfoil orthogonally aligned with respect to the cylinder. Detailed experiments (stereo-PIV, acoustic measurements) have been conducted in an anechoic wind tunnel and the data post-processed using spectral proper orthogonal decomposition has been applied to develop low-rank representations of the flow field. The low-rank flow data is used to inform semi-empirical source models in the framework of Howe’s vortex-sound theory. Sound propagation is modelled using compact Green’s functions obtained using the source panel method. Finally, we employ the previous tools to derive a simplified model for the far-field acoustic pressure.