STRUCTURE AND CHEMICAL-KINETICS OF FLAMES SUPPORTED BY NITROGEN-OXIDES

This paper is a report on efforts to model burner-stabilized and free-standing flames supported by nitrogen oxides. A 272-reaction mechanism has been used as a basis for modeling flames supported by the oxidizers N2O, NO2 and NO. Results have been compared with recent experimental data for burner-stabilized flames and free-standing flames. For burner-stabilized flames, comparisons between modeling and experimental data have been made for major species and radical concentrations. Where discrepancies between modeling and the data exist, analysis has been performed to identify key mechanisms contributing to species production rates in the flame. For free-standing flames, comparisons between modeling and experimental data have been made for flame velocities. Analysis has also been performed to identify key mechanisms in these flames. In general, the modeling results have been found to predict accurately major species concentrations in burner stabilized flames. Problems have been encountered, however, in accurately modeling the qualitative behavior of radical species. Reasonable agreement has been found between the modeling and experimental data for freely-propagating flames.