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- W157319669 abstract "We present results from computations of an igniting non-premixed methane jet in coflo w air using the GRImech1.2 chemical mechanism. Ignition is initiated in the jet mixing layer with the application of a short-duration heat-flux pulse along a narrow strip. An ignition kernel is formed in the rich mixture region inside the jet and is observed to propagate towards the stoichiometric mixture fraction line in the mixing layer. As the kernel penetrates the stoichiometric region, we observe the formation of a thin circular flame front which burns through the mixing layer and extinguishes at the lean edge. This leaves two edge-flames propagating away from this location along the stoichiometric line. We analyze the reaction zone internal structure and the chemical pathways in the flame fronts during the entire process, comparing them to those of 1D premixed flames at similar stoichiometries, and to results from earlier edge-flame studies. The fronts are seen to move at speeds 2-3 times that of the corresponding premixed flame, as they burn through preheated premixed radicals on the edge of the ignition zone. The strength of the front propagating away from the ignition zone is seen to decay gradually as it encounters lower-temperature gases with diminished availability of radicals." @default.
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- W157319669 date "2001-01-01" @default.
- W157319669 modified "2023-09-27" @default.
- W157319669 title "Ignition front structure in a methane-air jet. 1" @default.
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