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Besides turbulent boundary layer induced excitation noise, jet noise is the second most important aeroacoustic source for aircraft cabin noise. A goal within the DLR project ECCO (Enhanced Cabin Comfort Computations) was to improve current cabin noise pre- diction approaches. Within the framework of the project ECCO RANS (Reynolds Averaged Navier Stokes) and CAA (Computational Aero Acoustics) computations for jet noise at cruise conditions have been carried out. Especially at high cruise Mach numbers forward  ight eects have a clear impact on the radiated jet noise. These eects are well known from experiments and discussed detailed in the literature. The outcomes of these studies, e.g. scaling laws, will be used to verify the simulated jet noise spectra. Furthermore in- ight surface pressure spectra, which have been recorded during ight tests in the framework of the German national (LuFo IV) project SIMKAB (Simplied Cabin), are discussed here and compared with the simulations. In order to extend the validation data base to a more generic case a single stream jet (SSJ) with dierent jet and co ow velocities numerically and experimentally investigated.

RANS/CAA based Prediction of Jet Mixing Noise in Cruise Flight