Flame-seed structures: Original structures of nonpremixed flames in mixing layers of methane, ethane, propane and DME

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The ultimate structure of an edge-flame near the extinction limit was experimentally investigated using a fuel-air mixing layer within a narrow channel. The experimental parameters were the fuel dilution ratio, fuel concentration gradient, and average flow velocity. As a result, an interesting flame structure was discovered; that is, a nonpremixed-flame branch enclosed by two distinctive asymmetric premixed-flame branches. Experimental conditions that could most clearly distinguish the three flame branches were examined for the following fuels: methane, ethane, propane, and dimethyl ether (DME). Flame morphologies and their sensitivities to the fuel concentration gradient were investigated, and chemiluminescence trajectories along the three flame branches for various fuels were compared on a ternary diagram. Conclusively, it was found that each fuel has a unique morphological and chemiluminescent flame structure near its extinction limit. This structure can provide insight into various flame structures for premixed, partially premixed, nonpremixed, and MILD (moderate and intense low-oxygen dilution) combustion. Since this unique flame structure can bridge the gap between various laminar flame structures, it is called a flame-seed. If insight into the flame-seed structure can be gained, it will extend our understanding of the inter-connections among various laminar flame structures. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2017
Language
English
Article Type
Article
Keywords

PREMIXED FLAMES; TRIBRACHIAL FLAMES; MESOSCALE CHANNELS; TRIPLE FLAMES; REACTION ZONE; EDGE FLAME; PROPAGATION; CHEMILUMINESCENCE; STABILIZATION

Citation

PROCEEDINGS OF THE COMBUSTION INSTITUTE, v.36, no.3, pp.4235 - 4242

ISSN
1540-7489
DOI
10.1016/j.proci.2016.07.099
URI
http://hdl.handle.net/10203/220961
Appears in Collection
ME-Journal Papers(저널논문)
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