With multi-stream coannular nozzles, sometimes tones occur that may cause the nozzle to fail noise regulation standards. A two-stream nozzle was studied experimentally and numerically in an attempt to identify the sources of such tones and explore remedies. For the given nozzle configuration, sharp tones occurred in a range of low jet Mach numbers. The tones apparently occurred due to a coupling between vortex shedding from the struts, which held the nozzles and the center-body together, with various duct acoustic modes. A leading edge treatment of the struts is shown to eliminate the tones via disruption of the vortex shedding.
Tones Encountered with a Coannular Nozzle and a Method for Their Suppression
Aeroacoustics Conference (AIAA, CEAS) Aviation Forum 2017
;
2017
;
Denver, CO, United States
American Institute of Aeronautics and Astronautics (AIAA) Aviation Forum 2017
;
2017
;
Denver, CO, United States
2017-09-01
Conference paper
No indication
English
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