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Collective Interaction of a Compressible Periodic Parallel Jet FlowA linear instability model for multiple spatially periodic supersonic rectangular jets is solved using Floquet-Bloch theory. The disturbance environment is investigated using a two dimensional perturbation of a mean flow. For all cases large temporal growth rates are found. This work is motivated by an increase in mixing found in experimental measurements of spatially periodic supersonic rectangular jets with phase-locked screech. The results obtained in this paper suggests that phase-locked screech or edge tones may produce correlated spatially periodic jet flow downstream of the nozzles which creates a large span wise multi-nozzle region where a disturbance can propagate. The large temporal growth rates for eddies obtained by model calculation herein are related to the increased mixing since eddies are the primary mechanism that transfer energy from the mean flow to the large turbulent structures. Calculations of growth rates are presented for a range of Mach numbers and nozzle spacings corresponding to experimental test conditions where screech synchronized phase locking was observed. The model may be of significant scientific and engineering value in the quest to understand and construct supersonic mixer-ejector nozzles which provide increased mixing and reduced noise.
Document ID
19970025579
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miles, Jeffrey Hilton (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1997
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TM-107467
AIAA Paper 97-0150
NAS 1.15:107467
E-10754
Meeting Information
Meeting: Aerospace Sciences
Location: Reno, NV
Country: United States
Start Date: January 6, 1997
End Date: January 10, 1997
Sponsors: American Inst. of Aeronautics and Astronautics
Accession Number
97N25075
Funding Number(s)
PROJECT: RTOP 537-05-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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