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Computed Structure of Low Strain Rate Partially Premixed CH4/Air Counterflow Flames: Implications for NO Formation.

Published

Author(s)

L G. Blevins, J P. Gore

Abstract

Results from computations of low strain rate, partially premixed methane/air counterflow flames are reported. The Oppdif computer code was used with GRI-Mech 2.11 to obtain the results. When the fuel-side equivalence ratio is above 2.5, the present flame structure can be described as a CH4/air premixed flame merged with a CO/H2/air nonpremixed flame. When the equivalence ratio is below 2.5, the two flame zones exist on the opposite sides of the stagnation plane, and the CO/H2/air nonpremixed flame is characterized by hydrocarbon concentration peaks on its fuel-side edge. Broad NO destruction regions, caused by CHi+NO reactions, exist between the result in double hydrocarbon concentration peaks. The fuel-side equivalence ratio is the most important indicator of how rapidly NO is destroyed relative to how rapidly it is formed, and NO destruction reactions are more important inpure diffusion flames than in partially premixed flames for the present low strain rate computations.
Citation
Combustion and Flame
Publisher Info
, -1

Keywords

combustion chemistry, computation, counterflow flames, flame structure, nitrogen oxides, pollution, simulation

Citation

Blevins, L. and Gore, J. (1999), Computed Structure of Low Strain Rate Partially Premixed CH4/Air Counterflow Flames: Implications for NO Formation., Combustion and Flame, , -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916998 (Accessed February 25, 2024)
Created January 1, 1999, Updated February 17, 2017