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Concentration profiles of NH and OH in a stoichiometric CH4/N2O flame by laser excited fluorescence and absorption

✍ Scribed by William R. Anderson; Leon J. Decker; Anthony J. Kotlar

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 806 KB
Volume: 48
Category: Article
ISSN: 0010-2180
DOI: 10.1016/0010-2180(82)90126-2

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✦ Synopsis

The concentration profiles of NH and OH were measured in an atmospheric pressure, premixed, laminar CH4/N20 flame over a porous-plug, flat flame burner. Relative profiles were obtained by laser excited fluorescence tor both compounds and normalized by laser absorption at a single point for NH. The OH concentration was high enough to allow absorption measurements at several points for comparison with fluorescence results. The steeply rising portions of the profiles occur at about the same height above the burner, but the NH is confined to the primary reaction zone, while the OH decay extends into the burnt gases. The OH decay was analyzed using a simple rate law. The results and comparisons with previous results in CH4/air flames are discussed briefly. Brief studies of the peak NH concentration in CH4/air, CH4/NO, H2/NO, and H2/N20 flames were made in order to elucidate the flame chemistry.

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