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Nozzle Flow with Vibrational NonequilibriumFlow of nitrogen gas through a converging-diverging nozzle is simulated. The flow is modeled using the Navier-Stokes equations that have been modified for vibrational nonequilibrium. The energy equation is replaced by two equations. One equation accounts for energy effects due to the translational and rotational degrees of freedom, and the other accounts for the affects due to the vibrational degree of freedom. The energy equations are coupled by a relaxation time which measures the time required for the vibrational energy component to equilibrate with the translational and rotational energy components. An improved relaxation time is used in this thesis. The equations are solved numerically using the Steger-Warming flux vector splitting method and the Implicit MacCormack method. The results show that uniform flow is produced outside of the boundary layer. Nonequilibrium exists in both the converging and diverging nozzle sections. The boundary layer region is characterized by a marked increase in translational-rotational temperature. The vibrational temperature remains frozen downstream of the nozzle, except in the boundary layer.
Document ID
19960009114
Document Type
Thesis/Dissertation
Authors
Landry, John Gary (Old Dominion Univ. Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1995
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number
NAS 1.26:199948
NASA-CR-199948
NIPS-95-06856
Funding Number(s)
CONTRACT_GRANT: NAG1-1424
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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