Formation of NO in One- and Two-Dimensional Laminar Premixed Methane Air Flames Using Complex Reaction Schemes

摘要

The formation of NO in laminar premixed methane/air flames has been modelled with a postprocessing method. The results of the post-processing method applied to adiabatic flames agree well with complex computations, whereas the computational effort is reduced considerably. Computations are also compared with measurements for a ceramic foam surface burner and agree within the accuracy of the measurements and the reaction rate data. A two-dimensional computation of a flame on a single-slit burner in a confined environment is used to study the production of NO. The NO-production term is separated into a thermal and prompt part. The prompt NO formation rate is compared with an empirical model for prompt NO (Williams et al., 1992; Dupont et al., 1993). The empirical model does not indicate accurately where the prompt NO is formed and the order of magnitude of prompt NO emitted deviates roughly by a factor of two from the detailed computations.