Aeroacoustic investigation of a ducted tail rotor using the Lattice-Boltzmann Method

Abstract

Abstract: The present study focuses on the aeroacoustics aspects of a ducted rotor that could be used in helicopter electrically driven tail rotor systems. These systems are axial, low-solidity rotor-stator assemblies operating in low subsonic and transitional regimes at approach. Lattice Boltzmann (LBM) simulations are performed using a variable resolution (VR) mesh strategy that yields a proper convergence after ? 0.35 seconds. The flow behavior, far-field acoustic predictions, and directivity measurements are obtained with the LBM simulations and compared with experiments and RANS simulations done to the same tail rotor system. LBM gives closer predictions to experimentally aerodynamic properties than the RANS simulations. In addition, the direct far-field noise computations show a good overall match with experimental data.Communication présentée lors du congrès international tenu conjointement par Canadian Society for Mechanical Engineering (CSME) et Computational Fluid Dynamics Society of Canada (CFD Canada), à l’Université de Sherbrooke (Québec), du 28 au 31 mai 2023