Abstract by Kevin Leete
Physics and Astronomy
Coherence Analysis of a Simulated Jet at high Temperature
Large eddy simulations (LES) of laboratory-scale jets have been shown to accurately represent the radiated sound field. However, recent measurements of high-performance military aircraft jet noise show significant deviations from laboraty-scale jets. To investigate potential causes of these differences, LES is done of a laboratory-scale jet at a total temperature ratio of 7, which is in the regime of military aircraft operating at afterburner. The coherence between the flow pressures along the nozzle lipline and a simulated near-field array is analyzed to understand potential noise source mechanisms in the flow. Phenomenological differences are found between radiation originating from the potential core region and the region just after the end of the supersonic core.