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Asymptotic Analysis of the Structure of Nonpremixed Methane Air Flames UsingReduced Chemistry

机译：用推导化学方法对非预混甲烷空气火焰结构的渐近分析

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The asymptotic structure of counterflow, nonpremixed methane-air flames areanalyzed using a reduced four step chemical-kinetic mechanism. The rates of these four steps are related to the rates of elementary reactions appearing in the C1-chain mechanism for oxidation of methane. The outer structure of the flame is the classical Burke Schumann structure governed by the overall one-step reaction CH4 + 2O2 yields CO2 + 2H2O. The inner structure consists of an inner layer and an oxidation layer. Analysis of the inner layer is similar to that performed previously for premixed, methane-air flames and includes the influence of a number of additional reactions which were neglected in a previous analysis of the structure of diffusion flames. Attempts are made to provide a nearly complete description of the structure of the oxidation layer, by removing a number of assumptions introduced in previous analyses. Solutions are shown in the limit omega yields infinity and omega yields 0, where omega is the ratio of the thickness of the fuel consumption layer to the radical nonequilibrium layer. Results are obtained for the quantity X sub q which is proportional to the strain rate at extinction, for various levels of dilution of the reactant streams. The values of X sub q predicted in the limits omega yields 0 and omega yields infinity bracket the value of this quantity calculated from previous detailed numerical integrations. Although, the activation energy characterizing the rate of the elementary reactions is not large, the value of an effective overall activation energy describing the variation of X sub q with dilution of the reactant stream, deduced from this analysis is large and agrees reasonably well with the overall rate parameters deduced from experimental measurements of crit

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