Abstract
We have found that soot particle inception in our premixed ethylene flame occurs in a region where the O 2 concentration is of the order of 1 % and that particle inception ceases as the O 2 mole fraction drops much lower. This relationship between soot formation and O 2 concentration is in qualitative agreement with shock tube results. The net specific surface growth rate is close to zero in the inception zone, a fact that is consistent with oxidation of soot by O 2.
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