Abstract
In this paper we like to compare the flame structure under micro (parabolic flight) and normal gravity environment. In primary we will underline the role of buoyancy forces on the structure of the reaction zone and consequently on the soot chemical path. Using CH* and OH* radicals spontaneous emission, PAH laser fluorescence and soot laser incandescence signals we attempt to get the geometric characteristics of the reaction zone (stand-off distance, flame thickness and length) and to provide a qualitative description of the soot formation/oxidation path.
