The determining role of heterogeneous reactions of atoms and radicals in flame propagation

The dependence of flame propagation characteristics on heterogeneous reactions of atoms and radicals at atmospheric pressure is established. It is noted that along with participation in the breakage of reaction chains, adsorbed hydrogen atoms carry out heterogeneous development of chains as they react with O2 to form HO2 radicals registered by the laser magnetic resonance method. In the flame, HO2 radicals with H atoms form OH radicals, and thus heterogeneous development of chains takes place. The flame changes the chemical properties of the surface. It is concluded that the identified mechanism and equations derived from it quantitatively describe the observed patterns.