Experimental analysis of the near field pressure of a single stream subsonic jet

Measurements of the near field pressure around a single stream jet were performed in Cepra19, the anechoic wind tunnel of Onera, by means of an azimuthal array of microphones. Isothermal and heated jet were studied at the same 0.7 jet Mach number. Some tendencies observed in the experimental results are linked to the hydrodynamic and acoustic pressure fields present in the near field pressure. Numerical calculations and stability analysis will be performed in order to link these tendencies to non-linear behaviour.