The premixed turbulent reacting flow in an axisymmetric sudden-expansion combustor has been numerically simulated. The k-ε turbulent transport model and the EBU-Arrhenius turbulent reaction model are utilized for the closure of the time-averaged governing equations. The calculated results cover the time-averaged gas flow field, species mass fraction and temperature distributions for the premixed reacting flow in the sudden-expansion combustor. The EBU-Arrhenius model is discussed and evaluated based on the comparisons between the calculated results and the measured data.

A mathematical model of pulverized coal combustion is formulated and developed based on a particle continuum-trajectory model.An overall iterative solution procedure for reactive two-phase flows is also proposed.The corresponding CCVC computer code has been developed for calculating two-dimensional, recirculating,reactive,two-phase turbulent flows.It is utilized to numerically simulate the pulverized coal combustion in a combustor of large velocity difference jets which at plesent is widely used in coal fired boilers.