Finite-rate chemistry in modelling of two-dimensional jet premixed CH4/airflame

This paper presents numerical simulations of two-dimensional laminar methan e/air premixed jet flames with a detailed chemical kinetics mechanism. Comp rehensive transport and thermodynamic physical properties for each species and gas mixture are included and the nonunity Lewis number has been taken i nto account for a nonuniform burning pattern of fuel-rich premixed flames. The focal point of this work is to demonstrate the sensitivity of the model ling of the detailed chemical kinetics on the flame temperature and concent rations of major components for three different equivalence ratios. The tem perature and major species distributions are in good agreement with the exp erimental measurements by Nguyen et al., but the CO, OH and NO radical spec ies profiles still deviate from experiments. The typical flame structure of the steady jet premixed methane/air flame has been obtained. (C) 1998 Else vier Science Ltd. All rights reserved.