Low-temperature zone of the front of hydrocarbon flames

Preflame zone structure and main features of fuel conversion in atmospheric pressure premixed laminar hydrocarbon flames

“…In any case, as a result of H atom diffusion into fresh combustible mixture the formation of peroxy radicals can be expected. The latter were observed in the same flame using the technique of accumulating radicals in matrix from combustion products when cooled with liquid nitrogen [9]. Hydroperoxy and alkylperoxy radical net concentration profile in cold and hot flame zones is given in Fig.15.…”

“…That is why study of the H atoms distribution all over the reaction zone of the flame front seem attractive [9]. The distribution of the H atoms in nearly stoichiometric Bunsen atmospheric pressure propane air flames (4.2% propane) was studied with the ESR-spectrometer.…”

“…The approximate evaluation [ 5 ] shows that the rates of these reactions are roughly equal, the rate of reaction (1'0) somewhat prevailing. The detection in the preflame zone of both peroxy radicals [12] and peroxy compounds [9] speaks in favour of this suggestion. Reaction (9) propagating the chain provides only the breaking of the initial molecule, but reaction (10) due-to the intensive diffusion flux of H atoms may lead, in contrast, to the formation of peroxy biradicals, as described below.…”

The Role of Chain Processes in Cool Flames and Soot Formation

“…In [4] G.I. Ksandopulo together with his collaborators under atmospheric conditions studied a pre-mixed close to stoichiometric (4.2% propane) propane-air flame.…”