Far field pressure fluctuations and coherent structures in a low mach number turbulent jet flow

Simultaneous far field pressur/in-flow velocity fluctuations are measured in a turbulent jet flow at low Ma number. The experiment is conducted in an acustically controlled enviroment using LDV and standard microphones. Velocity signals acquired in several positions within the flow field are conditioned on the far field pressure peaks and signatures of ensamble averaged noise emitting event are retrieved. Present results confirms previous findings obtained on the same apparatus showing that intermittent structures within the turbulent region of the jet give a relevant contribution to the overall noise preceived in the far field