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Viscous-inviscid calculations of jet entrainment effects on the subsonic flow over nozzle afterbodiesA viscous-inviscid interaction model was developed to account for jet entrainment effects in the prediction of the subsonic flow over nozzle afterbodies. The model is based on the concept of a weakly interacting shear layer in which the local streamline deflections due to entrainment are accounted for by a displacement-thickness type of correction to the inviscid plume boundary. The entire flow field is solved in an iterative manner to account for the effects on the inviscid external flow of the turbulent boundary layer, turbulent mixing and chemical reactions in the shear layer, and the inviscid jet exhaust flow. The components of the computational model are described, and numerical results are presented to illustrate the interactive effects of entrainment on the overall flow structure. The validity of the model is assessed by comparisons with data obtained form flow-field measurements on cold-air jet exhausts. Numerical results and experimental data are also given to show the entrainment effects on nozzle boattail drag under various jet exhaust and free-stream flow conditions.
Document ID
19800013774
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Wilmoth, R. G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1980
Subject Category
Aerodynamics
Report/Patent Number
L-13362
NASA-TP-1626
Accession Number
80N22261
Funding Number(s)
PROJECT: RTOP 505-32-13-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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