Abstract
Aeroacoustic simulation of interaction noise generated by a contrafan model is proposed in this paper, in the framework of European Project VITAL (EnVIronmenTALly friendly aeroengine). Main objective here is to check the ability of advanced computations, including noise generation, propagation and radiation, to give a reliable evaluation of an innovative concept. Numerical simulations are realized by using a hybrid method based on the coupling of CFD (Computational Fluid Dynamics) and CAA (Computational Aero-Acoustics) ONERA codes. The matching between CFD and CAA is based on a Fourier-Bessel mode expansion of the perturbation field along a prescribed cross-section, from which outgoing modes then are traduced, in an original way, as source terms in the CAA. In-duct mode power and spectrum at the outer-wall are analyzed and discussed by comparison with theory and with similar results from project partners. Acoustic far field radiated by inlet and deduced from Kirchhoff integration is addressed in terms of mode spectrum and directivities. These predictions are to be compared to experimental data soon available.
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