PDF modeling and analysis of thermal NO formation in turbulent nonpremixed hydrogen-air flames

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90042-N· OSTI ID:5648688

Chen, J Y ^[1]; Kollmann, W ^[2]

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1. Combustion Research Facility, Sandia National Lab., Livermore, CA (US)
2. Dept. of Mechanical Engineering, Univ. of California, Davis, CA (US)

In this paper a numerical model is developed based on the probability density function (pdf) approach to study the thermal NO formation in turbulent nonpremixed hydrogen jet flames. In particular, the effects of nonequilibrium chemistry and radiation heat loss on the thermal NO formation are examined. The numerical results indicate that when the NO{sub x} emission index is scaled with a properly defined flame residence time, it shows the negative one-half power dependence on the Damkohler number as observed by Chen and Driscoll (Twenty-Third Symposium (International) on Combustion). An analysis is performed suggesting that the observed power dependence is due to the nonequilibrium chemistry effect, and it depends on the self-similar laws for jets. Comparisons of numerical results obtained with and without radiation heat loss show a significant impact on the thermal NO formation for jet flames with radiant fractions greater than 5%.

• OSTI ID: 5648688
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 88:3; ISSN CBFMA; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
083000* -- Hydrogen-- Combustion-- (1990-)
AIR
BINARY MIXTURES
CHALCOGENIDES
CHEMISTRY
DISPERSIONS
ELEMENTS
EQUILIBRIUM
FLAMES
FLUIDS
GASES
HYDROGEN
JETS
MATHEMATICAL MODELS
MIXING
MIXTURES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
PROBABILITY
PRODUCTION
TURBULENCE