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A Solution Methodology and Computer Program to Efficiently Model Thermodynamic and Transport Coefficients of MixturesA solution methodology has been developed to efficiently model multi-specie, chemically frozen, thermally perfect gas mixtures. The method relies on the ability to generate a single (composite) set of thermodynamic and transport coefficients prior to beginning a CFD solution. While not fundamentally a new concept, many applied CFD users are not aware of this capability nor have a mechanism to easily and confidently generate new coefficients. A database of individual specie property coefficients has been created for 48 species. The seven coefficient form of the thermodynamic functions is currently used rather then the ten coefficient form due to the similarity of the calculated properties, low temperature behavior and reduced CPU requirements. Sutherland laminar viscosity and thermal conductivity coefficients were computed in a consistent manner from available reference curves. A computer program has been written to provide CFD users with a convenient method to generate composite specie coefficients for any mixture. Mach 7 forebody/inlet calculations demonstrated nearly equivalent results and significant CPU time savings compared to a multi-specie solution approach. Results from high-speed combustor analysis also illustrate the ability to model inert test gas contaminants without additional computational expense.
Document ID
20010036865
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Ferlemann, Paul G.
(FDC/NYMA, Inc. Hampton, VA United States)
Date Acquired
August 20, 2013
Publication Date
November 1, 2000
Publication Information
Publication: JANNAF 25th Airbreathing Propulsion Subcommittee, 37th Combustion Subcommittee and 1st Modeling and Simultation Subcommittee Joint Meeting
Volume: 1
Subject Category
Propellants And Fuels
Funding Number(s)
CONTRACT_GRANT: NAS1-96013
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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