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Tones Encountered with a Coannular Nozzle and a Method for Their SuppressionWith 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.
Document ID
20170009583
Document Type
Conference Paper
Authors
Zaman, Khairul Bmq (NASA Glenn Research Center Cleveland, OH, United States)
Bridges, James E. (NASA Glenn Research Center Cleveland, OH, United States)
Fagan, Amy Florence (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Christopher J. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
October 5, 2017
Publication Date
September 1, 2017
Subject Category
Acoustics
Aerodynamics
Report/Patent Number
E-19408
NASA/TM-2017-219559
GRC-E-DAA-TN44168
AIAA-2017-3860
Meeting Information
Aeroacoustics Conference (AIAA, CEAS) Aviation Forum 2017(Denver, CO)
Funding Number(s)
WBS: WBS 110076.02.03.04.40.02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
vortex shedding
acoustic tones
duct resonance

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