The effects of initial jet exit conditions on plume resonanceThe acoustic emission and boundary layer of a cold jet issuing from an underexpanded sonic nozzle have been measured for lip thicknesses of the nozzle exit varying from 0.015-0.625 nozzle diameters. Near-field acoustic data demonstrate that the amplitude and frequency of certain modes of screech and the dominant mode of instability which exists in the shear layer are dependent on nozzle lip thickness. Changes in momentum thickness due to variations in the nozzle exit were also quantified.
Document ID
19890046339
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ponton, Michael K. (NASA Langley Research Center Hampton, VA, United States)
Seiner, John M. (NASA Langley Research Center Hampton, VA, United States)