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Numerical study on effect of CO 2 addition in flame structure and NO x formation of CH 4 ‐air counterflow diffusion flames
Author(s) -
Lee C. E.,
Lee S. R.,
Han J. W.,
Park J.
Publication year - 2001
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.686
Subject(s) - flame structure , nox , diffusion flame , chemistry , diffusion , methane , premixed flame , strain rate , thermal , radiation , adiabatic flame temperature , thermodynamics , combustion , mechanics , organic chemistry , combustor , optics , physics
Numerical study with detailed chemistry has been conducted to investigate the effect of CO 2 addition on flame structure and NO x formation in CH 4 –air counterflow diffusion flame. Radiation effect is found to be dominant especially at low strain rates. The addition of CO 2 makes radiation effect more remarkable even at high‐strain rates. It is, as a result, seen that flame structure is determined by the competition between the radiation and strain rate effects. The important role of CO 2 addition is addressed to thermal and chemical reaction effects, which can be precisely specified through the introduction of an imaginary species. Thermal effect contributes to the changes in flame structure and NO formation mainly, but the effect of chemical reaction cannot be neglected. It is noted that flame structure is changed considerably due to the addition of CO 2 , in such a manner, that the path of methane oxidation prefers to take CH 4 →CH 3 →C 2 H 6 →C 2 H 5 instead of CH 4 →CH 3 →CH 2 →CH. Copyright © 2001 John Wiley & Sons, Ltd.