Simulations of Noise Generated by Rotor-Rotor Interactions at Static Conditions
Samuel Afari, Reda R. Mankbadi
Abstract
View Video Presentation: https://doi.org/10.2514/6.2021-1986.vid A high-fidelity simulation of two inline counter-rotating propellers in hover condition is performed. Near field flow properties as well as the acoustics were resolved using Hybrid LES-Unsteady RANS. Far-field acoustic predictions were performed using Ffowcs-Williams-Hawkings formulation. Investigations into the far-field spectral and near-field acoustic properties of a two-propeller configuration are made and compared with the single- propeller case to reveal the multi-rotor interactions. An increase in broadband levels was observed, and it seems to be resulting from the interaction of the wakes due to the relatively small separation distance between the two propellers.