Structure of the edge flame in a methane-oxygen mixing layer
- Structure of the edge flame in a methane-oxygen mixing layer
- 최상규; 김준홍; 정석호; 김종수
- oxy-fuel combustion; methane oxidation; edge flame; mixing layer
- Issue Date
- Combustion theory and modelling
- VOL 13, NO 1, 39-56
- The structure of an edge flame in a mixing layer of two uniformly flowing pure CH4 and
pure O2 streams has been investigated numerically by employing a detailed methane–
oxidation mechanism in order to investigate the influence of using pure oxygen, instead
of air, as the oxidizing agent. The results exhibited similar behaviour to the CH4-air
counterpart in the premixed-flame front, through which the carbon-containing compound
leaked mainly in the form of CO and H2 instead of HC compounds. However,
while passing through the rich premixed-flame region, the most pronounced distinction
of using pure oxygen was that the major route for CO production, in addition to the
direct CH4 decomposition, is C2Hm compound formation followed by their decomposition
into CO, thereby giving continuous CO production, contrary to the rich CH4-air
premixed-flame region in which CO consumption existed.
In the downstream region from the rich premixed flame front, CO is further oxidized
into CO2 in a broad diffusion-flame-like reaction zone located around the moderately
fuel-rich side of the stoichiometric mixture by the OH radical produced from the oxygen
leakage from the fuel-lean premixed-flame front. Since the secondary CO production
through C2Hm decomposition has a relatively strong reaction intensity, an additional
heat-release branch appears and the resulting heat-release profile can no longer be
treated as a tribrachial structure.
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