Detailed chemistry of NH3/N2O/Ar flames by mass spectrometry, laser-induced fluorescence, and modeling

Rosario C. Sausa; Demetris T. Venizelos

doi:10.1117/12.337469

22 January 1999 Detailed chemistry of NH₃/N₂O/Ar flames by mass spectrometry, laser-induced fluorescence, and modeling

Rosario C. Sausa, Demetris T. Venizelos

Proceedings Volume 3535, Advanced Sensors and Monitors for Process Industries and the Environment; (1999) https://doi.org/10.1117/12.337469
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

Experimental and chemical modeling studies of a 60-Torr Nh₃/N₂O/Ar::1.03/1.59/0.54 flame are performed in order to provide further testing and refinements of a detailed chemical mechanisms developed previously in our laboratory. This mechanism consists of 87 reactions and 20 species and is denoted VS. Flame temperatures are measured with a coated, thin-wire thermocouple and by OH and NH by laser- induced fluorescence (LIF). Species concentration profile of NH₃, N₂O, N₂, NO, O₂, NH and OH are recorded using molecular beam pass spectrometry and/or LIF. The experimental species mole fractions are then compared to PREMIX laminar flame code calculations, which use the measured temperature profile and one of two detailed N/O/H chemical mechanisms, VS or VS-modified, as input. The PREMIX calculations using the VS mechanism predict very well the shapes of the experimental NH₃, N₂O, N₂ H₂O, NO, OH and NH profiles throughout the flame. They overpredict, however, the O₂/Ar mole fraction ratio at 16.25 mm by 61 percent. Sensitivity analyses suggest refinements to the VS mechanisms. These refinements, along with rate analyses of the PREMIX results, are presented and discussed.

Citation Download Citation

Rosario C. Sausa and Demetris T. Venizelos "Detailed chemistry of NH₃/N₂O/Ar flames by mass spectrometry, laser-induced fluorescence, and modeling", Proc. SPIE 3535, Advanced Sensors and Monitors for Process Industries and the Environment, (22 January 1999); https://doi.org/10.1117/12.337469

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