Numerical study of the structures of partially premixed laminar flames

Partially premixed laminar flames were numerically simulated using a specific set of flamelet equations to take into account different diffusion effects. Results from the flamelet equations and those from physical space showed good consistency while consistency was also maintained within the whole equation system. Additionally, two different models of scalar dissipation rate were used in later simulations and the results indicated that a more precise model would lead to better accuracy. Furthermore, the response of the structure of partially premixed flames to the variation of scalar dissipation rates was studied using these flamelet equations. A double-flame structure which is totally different from non-premixed flame was captured at low scalar dissipation rates. Reasons for the phenomenon were also discussed.