Absorption spectroscopy diagnostics of amidogen in ammonia-doped methane/air flames
Journal Article
·
· Combustion and Flame
- School of Chemistry, Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978 (Israel)
The NH{sub 2} absolute concentration profiles were measured by intracavity laser absorption spectroscopy in methane/air laminar flat flames doped with trace amounts of ammonia ({approx}0.1% of the total gas flow) at a pressure of 30 Torr. The radial distribution of NH{sub 2} in the flame was obtained using tomographic reconstruction. The obtained results are compared with one-dimensional model predictions. The temperature profiles, experimentally measured by OH and NO laser-induced fluorescence, were used as an input for the model. Several mechanisms were used. GRI-Mech 3.0 predicts the appearance of an additional maximum for the NH{sub 2} profile in the vicinity of the burner surface, which is not observed in the experiment. The effect of different reactions of the NH{sub 2} radical on its concentration profile at close distances from the burner is discussed. All the mechanisms successfully predict the peak concentration of amidogen in ammonia-doped flames, which is almost unaffected by the equivalence ratio in contrast to flames doped with nitrogen oxides. The maxima of the experimental profiles are located {approx}1 mm farther from the burner surface than the simulated ones, which is probably caused by applying a 1-D model for describing the real 3-D flame. (author)
- OSTI ID:
- 20727296
- Journal Information:
- Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 145; ISSN CBFMAO; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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