A STUDY ON OPPOSED GASEOUS JET FLAMES STABILIZED IN A UNIFORM AIRSTREAM : 4TH REPORT : EXTINCTION MECHANISM OF OPPOSED GASEOUS JET FLAMES

概要

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As a final stage of this study the extinction mechanism is treated qualitatively on the basis of preceeding results. It is found that the partial extinction in the frontal flame zone can be explained with the relation between the first Damkohler number and the maximum temperature on the axis, and that this mechanism is similar to that of laminar opposed diffusion flames. To deal with the overall extinction at the stability limit the excess-reaction variable is found analytically, which has a physical meaning of an overall and average reaction ability of the flame. With this variable and the first Damkohler number three stability curves with different nozzle pressure can be collapsed into a single curve, and the mechanism of extinction at each stability limit can be elucidated independently of the nozzle pressure. It is found that the kind of flame in the stable region depends only on the excess-reaction variable.
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