Experimental Characterization of Trapped Waves in a Mach 0.9 Jet By Rayleigh Scattering
Résumé
Trapped waves in the potential core of high subsonic jet can be described as a system of waves responsible for a series of sharp peaks in the near-field pressure spectrum. In this work, density fluctuations associated with these acoustic waves in a Mach 0.9 jet are measured using Rayleigh scattering in the jet potential core. The setup is installed in an anechoic wind tunnel, where simultaneous measurements of acoustic near-field pressure and flow density spectra are carried out. The lowest frequency and more prominent peak characteristic of trapped waves is observed at the same frequency in the acoustic and density spectra. The ability of the present setup to detect trapped waves signatures in the density spectrum is demonstrated.
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