The inner structure of methaneair flames

摘要: The inner structure of a methaneair premixed flame is analyzed using reduced four-step chemical kinetic mechanism ICO + H2O ⇌ CO2 H2 IICH4 2H → CO 4H2 IIIH H M H2 M IVO2 3H2 2H2O 2H The rates these four steps are related to the elementary reactions appearing in C1-chain for oxidation methane. layer thin with I–IV occurring this layer, and embedded between chemically inert upstream broader (but asymptotically thin) downstream where II, III, IV occur oxidized. The analysis reported here extends previous by Peters Williams flames, three-step was used. In equations describing parameter ω appears, which represents ratio thickness fuel consumption radical Williams. Analytical solutions burning velocity eigenvalue L obtained limit 0 ∞, use numerical integration, an approximation as function ω, includes limiting expressions ∞. expression contains number parameters, represent influence reactions. particular, defined μ found have significant on value L, consequently velocity, quantity increases increasing pressure. backward CH4 CH3 OH H2O. Using results analysis, calculated stoichiometric values pressure p 1 atm 80 atm. At = atm, 35 cm/s reasonable agreement experimental results. decreased pressure, again measurements.