Simulation of an ethylene-air jet flame with soot and radiation modeling

Large eddy simulation of an ethylene-air diffusion flame and supporting direct numerical simulations are presented. A reduced mechanism recently developed by Wang et al. is used (22 species, 107 reactions) and a systematic study is performed which compares the reduced mechanism to the original full mechanism ({\it USC Mech Version II}: 111 species, 784 reactions). A series of calculations are then validated by comparing results with CHEMKIN, Lignell et al. ({\it Combust. Flame 2007}) and the premixed experiments from Bhargava \& Westmoreland ({\it Combust. Flame 1998}). The baseline soot model employed is from Leung et al ({\it Combust. Flame 1991}) and accounts for nucleation, growth, oxidation and coagulation. This model is coupled through source terms as a function of $C_2 H_2$, $C O$, $O_2$ and $H_2$. The first two moments are considered to account for the number density and soot mass per volume. Initially the radiation model assumes an optically thin medium in a manner consistent with Lignell et al. Results associated with the soot model will be presented along with comparisons with experimental data.