Correlation of Flowfield and Acoustic Field Measurements in High-Speed Jets

摘要

The present study demonstrates the capabilities of an optical deflectometry system to provide flowfield turbulence measurements that can be successfully correlated with acoustic field microphone measurements. Results from supersonic fully expanded jets are presented that document the coherence spectra between the flowfield and the acoustic field. The method is applied to jets with subsonic and supersonic convection speed, and shows a strong directionality of the emitted noise in both cases.