Flame structure studies of burner-stabilized N2O- and NO2-containing flames by mass spectrometry,laser-induced fluorescence, and modeling

Rosario C. Sausa; Demetris T. Venizelos

doi:10.1117/12.449360

26 November 2001 Flame structure studies of burner-stabilized N₂O- and NO₂-containing flames by mass spectrometry,laser-induced fluorescence, and modeling

Rosario C. Sausa, Demetris T. Venizelos

Author Affiliations +

Proceedings Volume 4448, Optical Diagnostics for Fluids, Solids, and Combustion; (2001) https://doi.org/10.1117/12.449360
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Experimental and chemical modeling studies of H₂/N₂O/Ar, H₂NH₃/N₂O/Ar, and H₂/N₂O/NO₂/Ar flames are performed to test and refine a detailed chemical mechanism developed in our laboratory. This mechanism consists of 103 reactions and 22 species, and is denoted VS-modified-2. Flame temperatures are measured with a coated, thin-wire thermocouple and by OH and NH laser- induced fluorescence (LIF), whereas species concentration profiles of H₂, NH₃, N₂O, N₂, H₂O, NO, O₂, NH and OH are recorded using molecular beam/mass spectrometry, LIF, or both. The experimental species concentrations are compared to those generated with PREMIX, a 1D, laminar, flame code, using the measured temperature profile and the VS-modified-2 mechanism as input. Overall, laminar, flame code, using the measured temperature profile and the VS-modified-2 mechanism as input. Overall, the PREMIX calculations predict very well the major, species concentrations throughout each flame. For the H₂,N₂O,Ar flame, the postflame O₂, OH, and NO concentrations decrease by approximately 90, 45, and 35 percent, respectively, with the addition of approximately 4 percent NH₃. This decrease is predicted rather well by the PREMIX calculations, which show a decrease in O₂, OH, and NO by approximately 90, 55, and 40 percent respectively. The shapes of the modeled O₂, NO, and OH profiles for the H₂/N₂O/NO₂/Ar flame are in excellent agreement with those observed experimentally. The modeled OH profile even predicts an observed peak at approximately 3 mm above the burner surface. This peak is attributed to the competition between the NO+H equals NO + OH reaction, which produces OH, and the H₂ + OH equals H₂O + H reaction, which consumes it. Rate and sensitivity analyses of the above-mentioned flames are presented discussed.

Citation Download Citation

Rosario C. Sausa and Demetris T. Venizelos "Flame structure studies of burner-stabilized N₂O- and NO₂-containing flames by mass spectrometry,laser-induced fluorescence, and modeling", Proc. SPIE 4448, Optical Diagnostics for Fluids, Solids, and Combustion, (26 November 2001); https://doi.org/10.1117/12.449360

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