NASA NTRS · 20170005785
Tones Encountered with a Coannular Nozzle and a Method for their Suppression
Abstract
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 at-tempt 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.
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Zaman, K. B. M. Q., Bridges, J. E., Fagan, A. F., Miller, C. J.. 2017-06-05. Tones Encountered with a Coannular Nozzle and a Method for their Suppression. https://ntrs.nasa.gov/citations/20170005785
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