Computational AeroAcoustics of a realistic co-axial engine in subsonic and supersonic take-off conditions

The present work is devoted to the numerical simulation of acoustic emissions characterizing turbojet engines, a subject that is relevant of the more general purpose of aircraft noise prevision and reduction. More precisely, we explore here the ability of a structured CAA (Computational AeroAcoustics) method/solver to address complicated problems of engine noise prediction. With that end, and by using the ONERA's CAA solver sAbrinA.v0, we conduct realistic calculations of aft fan noise emission, which involve both a full-3D exhaust geometry (with its pylon / internal bifurcations) and typical fan noise modal contents (high azimuthal order / frequency). The results highlight how far the installation / refraction effects induced by the complex geometry / flow of an engine can affect its fan noise emission. Results also tend to demonstrate that both the here used CAA method and solver are mature enough to face out industrial-like engine noise problems.