Flap Side-Edge Noise Simulation Using RANS-based Source Modelling

Abstract

Airframe noise significantly contributes to the overall noise annoyance on community during near-airport aircraft operations. Nonetheless, this noise source is increasing is relevance because of the concomitant reduction of engine noise. Flap side-edge noise has been recognized as a significant source of noise at approach. In this study, numerical simulations have been performed in order to compute the noise generated and radiated from an isolated flap-side edge. The capability of a stochastic noise source model based on Fast Random Particle Mesh method is explored. Numerical propagation is performed using acoustic perturbations equations and the vorticity source model. The numerical results are compared to semi-empirical noise source modelling and wind tunnel tests. Velocity and angle of attack noise scaling are evaluated. It is shown that the main trend of flap-side edge noise can be reproduced using RANS-based source modelling