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Laser Raman scattering measurements of differential molecular diffusion in turbulent nonpremixed jet flames of H{sub 2}/CO{sub 2} fuel [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
16 pages : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This paper explores effects of differential diffusion in nonpremixed turbulent jet flames. Pulsed Raman scattering spectroscopy is used to measure temperature and species concentrations in chemically reacting jets of H₂/CO₂ into air, over a range of jet Reynolds numbers from 1,000 to 30,000 based on cold jet fluid properties. Results show significant effects of differential diffusion at all jet Reynolds numbers considered. Differential diffusion between H₂ and CO₂ produces differences between the hydrogen element mixture fraction (ξ{sub H}) and the carbon element mixture fraction (ξ{sub c}). The greatest effects occur on the rich side of stoichiometric, where ξ{sub H} is observed to be smaller than ξ{sub C} at all Reynolds numbers. Differential diffusion between H₂ and H₂O creates a net flux of hydrogen element toward the stoichiometric contour and causes a local maximum in ξH that occurs near the stoichiometric condition. A differential diffusion variable {sup Z}H is defined as the difference between ξ{sub H} and ξ{sub C}. The variance of {sup Z}H conditional on ξ{sub C} also shows that differential diffusion effects are greatest on the rich side of the flame. Conditional variances of {sup Z}H are largest at intermediate Reynolds numbers.
Report Numbers
E 1.99:sand--94-8502c
E 1.99: conf-940838--3
conf-940838--3
sand--94-8502c
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1994.
"sand--94-8502c"
" conf-940838--3"
"DE94005108"
25. combustion symposium,Irvine, CA (United States),1 Aug 1994.
Smith, L.L.; Carter, C.D.; Dibble, R.W.; Talbot, L.; Barlow, R.S.
Funding Information
AC04-76DR00789
View MARC record | catkey: 14394399