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Correlations between density fluctuations and acoustic far field in free jets using Rayleigh scattering

The mixing noise of a subsonic jet at M j = 0.9 and of an ideally expanded supersonic jet at M j = 1.32 is experimentally investigated. The time-resolved density fluctuations are measured by a Rayleigh scattering based apparatus, and confronted to the acoustic pressure measured by a microphone in the far-field. High levels of coherence are found between the flow downstream the end of the potential core of the jets, and the acoustics measured along the downstream direction. The average event of density responsible for the radiation of acoustics in the downstream direction is also extracted by using a conditional processing.