CALCULATION OF JET NOISE USING A SEMIDETE RMINISTIC APPROACH

The whole proceeding of the evaluation of turbulent jet noise with Lig hthill formulation from large scale instationnary aerodynamic data is presented. The bask case of the two-dimensional shear layer is complet ely studied and the main features of the method are established. The f ar field acoustic fluctuations show a satisfying spectral contents and the directivity can be compared to what is observed for subsonic jets . The first aerodynamic data of the plane jet are also presented. They should allow more precise acoustic validations before the more realis tic case of the axisymmetrical jet.