Flame structures and behaviors of opposed flow non-premixed flames in mesoscale channels

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An opposed flow non-premixed flame (OFNPF) in a narrow channel was chosen as a model of a non-premixed flame in a mesoscale combustion space or micro-combustor. The stabilization limits and behaviors of methane-air flames and propane-air flames were compared for various experimental parameters such as flow velocity, nozzle distance, nozzle width, channel gap, and fuel dilution. Flames could be stabilized in a wide range of strain rates (0.9-150 s(-1)) and dilution ratios (similar to 80% nitrogen at the fuel side). The flame extinction limits were classified into three types and their mechanisms were investigated: higher-strain-rate (HSR) extinction limit determined by the flame stretch, lower-strain-rate (LSR) extinction limit determined by the conductive or convective heat loss from the flame, and fuel-dilution-ratio (FDR) extinction limit determined by the decrease in the heat release rate from the flames. The HSR extinction limits in mesoscale channels could be explained with a modified strain rate, and the LSR extinction limits could be explained by employing a premixed quenching theory in which the heat loss through the dead space near the wall was considered as a major extinction mechanism. Finally, the variation of the extinction limits with the FDR in both the HSR and the LSR conditions could be explained with a modified global reaction rate in which the variations in flame temperature and species concentrations were reflected. This study provides an essential model for the stabilization and extinction of non-premixed flames in mesoscale combustion spaces.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2014-09
Language
English
Article Type
Article
Keywords

EDGE-FLAME; COUNTERFLOW FIELD; DIFFUSION FLAME; METHANE FLAMES; TRIPLE FLAME; STRAIN; EXTINCTION; MICROGRAVITY; PROPAGATION; COMBUSTION

Citation

COMBUSTION AND FLAME, v.161, no.9, pp.2361 - 2370

ISSN
0010-2180
DOI
10.1016/j.combustflame.2014.03.004
URI
http://hdl.handle.net/10203/192526
Appears in Collection
ME-Journal Papers(저널논문)
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