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Direct numerical simulation of turbulent H2-O2 combustion using reduced chemistryResults of direct numerical simulations of hydrogen-oxygen combustion using a partial-equilibrium chemistry scheme in constant density, decaying, isotropic turbulence are reported. The simulations qualitatively reproduce many features of experimental results, such as superequilibrium radical species mole fractions, with temperature and major species mole fractions closer to chemical equilibrium. It was also observed that the peak reaction rates occur in narrow zones where the stoichiometric surface intersects regions of high scalar dissipation, as might be expected for combustion conditions close to chemical equilibrium. Another finding was that high OH mole fraction correspond more closely to the stoichiometric surface than to areas of high reaction rate for conditions of the simulations. Simulation results were compared to predictions of the Conditional Moment Closure model. This model was found to give good results for all quantities of interest when the conditionally averaged scalar dissipation was used in the prediction. When the nonconditioned average dissipation was used, the predictions compared well to the simulations for most of the species and temperature, but not for the reaction rate. The comparison would be expected to improve for higher Reynolds number flows, however.
Document ID
19930038662
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Montgomery, Christopher J.
(NASA Headquarters Washington, DC United States)
Kosaly, George
(NASA Headquarters Washington, DC United States)
Riley, James J.
(Washington Univ. Seattle, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
AIAA PAPER 93-0248
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 11, 1993
End Date: January 14, 1993
Sponsors: AIAA
Accession Number
93A22659
Funding Number(s)
CONTRACT_GRANT: NSF CTS-90-21928
CONTRACT_GRANT: NGT-40011
Distribution Limits
Public
Copyright
Other

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