NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Towards Simulating Non-Axisymmetric Influences on Aircraft Plumes for Signature PredictionA methodology for efficiently including three-dimensional effects on aircraft plume signature is presented. First, exploratory work on the use of passive mixing enhancement devices, namely chevrons and tabs, in IR signature reduction for external turbofan plumes is demonstrated numerically and experimentally. Such small attachments, when properly designed, cause an otherwise axisymmetric plume to have significant 3D structures, affecting signature prediction. Second, an approach for including non-axisymmetric and installation effects in plume signature prediction is discussed using unstructured methodology. Unstructured flow solvers, using advanced turbulence modeling and plume thermochemistry, facilitate the modeling of aircraft effects on plume structure that previously have been neglected due to gridding complexities. The capabilities of the CRUNCH unstructured Navier-Stokes solver for plume modeling is demonstrated for a passively mixed turbofan nozzle, a generic fighter nozzle, and a complete aircraft.
Document ID
20010021592
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Kenzakowski, D. C.
(Combustion Research and Flow Technology, Inc. Dublin, PA United States)
Shipman, J. D.
(Combustion Research and Flow Technology, Inc. Dublin, PA United States)
Dash, S. M.
(Combustion Research and Flow Technology, Inc. Dublin, PA United States)
Date Acquired
August 20, 2013
Publication Date
May 1, 2000
Publication Information
Publication: JANNAF 25th Exhaust Plume Technology Subcommittee and 7th SPIRITS User Group Joint Meeting
Volume: 1
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: SPIRITS User Group
Location: Las Vegas, NV
Country: United States
Start Date: May 15, 2000
End Date: May 18, 2000
Sponsors: Department of the Army, Department of the Air Force, Department of the Navy, NASA Headquarters
Funding Number(s)
CONTRACT_GRANT: NAS3-99-98
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available