Mathematical Modelling of Nitric Oxide Formation in Turbulent Diffusion Flames Doped with a Nitrogen Compound

Mathematical Modelling of Nitric Oxide Formation in Turbulent Diffusion Flames Doped with a Nitrogen Compound

A numerical study has been effected to investigate nitric oxide (NO) formation in large-scale gas-oil spray flames doped with a nitrogen compound to simulate fuel-nitrogen. The mathematical model for aerodynamic/combustion incorporates a Reynolds-stress model for turbulence and an eddy-dissipalion m...

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Bibliographic Details
Published in:Combustion science and technology Vol. 160; no. 1; pp. 345 - 367
Main Authors: MA, C.Y., MAHMUD, T., HAMPARTSOUMIAN, E., RICHAROSON, J., GASKELL, P.H.
Format: Journal Article
Language:English
Published: London Taylor & Francis Group 01-11-2000
Taylor & Francis
Subjects:
Applied sciences
Combustion Modelling
Combustion of liquid fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
NO Measurements
NO Modelling
Theoretical studies. Data and constants. Metering
Turbulent Diffusion Flame
Nitrogen oxide
Turbulent flame
Experimental test
Two dimensional model
Reaction rate
Pollutant emission
Modeling
Light gas oil
Pyridine
Diffusion flame
Nitric oxide
Quinoline
Mathematical model
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Summary:A numerical study has been effected to investigate nitric oxide (NO) formation in large-scale gas-oil spray flames doped with a nitrogen compound to simulate fuel-nitrogen. The mathematical model for aerodynamic/combustion incorporates a Reynolds-stress model for turbulence and an eddy-dissipalion model (Magnussen and Hjertager, 1978) for combustion. NO predictions are obtained using the Zeldovich mechanism for thermal-NO with two variants for the calculation of oxygen-atom concentration, and the kinetic rate expressions of De Soete (1975) for the formation of prompt- and fuel-NO. The effect of turbulence/chemistry interactions on NO formation rates is represented by a single variable beta probability density function. Predictions are compared with detailed in-flame and flue-gas data obtained in previous studies for different levels of doping with quinoline while maintaining the same flame conditions. These data allowed contributions of thermal- and fuel-NO to the total NO emissions to be estimated with a reasonable degree of accuracy. The predicted and measured gas temperature and major species concentrations are generally in good agreement though discrepancies exist in the shear layers near the burner. Validation of the NO post-processor against experimental data for different fuel-nitrogen doping levels has revealed good qualitative predictions and, in most cases, good quantitative agreements. The contributions of individual NO formation mechanisms to the total NO emissions are well simulated by the NO model.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0010-2202
1563-521X
DOI:10.1080/00102200008935807