Numerical modeling for the H-2/CO bluff-body stabilized flames

This study investigates the nonpremixed H-2/CO-air turbulent flames numeric ally. The turbulent combustion process is represented by a reaction progres s variable model coupled with the presumed joint probability function. In t he present study, the turbulent combustion model is applied to analyze the nonadiabatic flames by introducing additional variable in the transport equ ation of enthalpy and the radiative heat loss is calculated using a local, geometry independent model. Calculations are compared with experimental dat a in terms of temperature, and mass fraction of major species, radical, and NO. Numerical results indicate that the lower and higher fuel-jet velocity flames have the distinctly different flame structures and NO formation cha racteristics in the proximity of the outer core vortex zone. The present mo del correctly predicts the essential features of flame structure and the ch aracteristics of NO formation in the bluff-body stabilized flames. The effe cts of nonequilibrium chemistry and radiative heat loss on the thermal NO f ormation are discussed in detail.