Numerical modeling of a two dimensional axisymmetric laminar ethylene-air diffusion flame

摘要

A numerical modeling of soot formation has been conducted for an axisymmetric, laminar, coflow diffusion ethylene-air flame at atmospheric pressure. A detailed reaction mechanism, which consists of 36 species and 219 reactions, and complex thermal and transport properties are used. The fully coupled elliptic equations are solved. A simple two-equation soot model is coupled with the detailed gas-phase chemistry. The interactions between the soot and gas-phase chemistry are taken into account. The radiation heat loss is obtained by the discrete ordinate method coupled to a SNBCK based wide band model for radiative properties of CO, CO{sub}2, H{sub}2O and soot. The predicted flame temperature and soot volume fraction are compared with the experimental results. Although we observe a good qualitative agreement between the numerical and experimental results, predicted flame temperature and soot volume fraction are lower than the experimental values in the centerline region. The numerical results indicate that the radiative heat loss due to the presence of soot is significant in this type of flames.