AlAA, 99-2776 PSR-based Microstructural Modeling for Turbulent Combustion Processes and Psillutant Formation in -Double Swirler Combustors

The present study numerically investigates the fuelair mixing characteri.stics, 1 flame structure, and pollutant emission inside a double-swirler combustor. A PSR-based microstructural: model is employed to account for the effects of finite rate chemistry on the flamestructure and NO formation. The turbulent combustion model is extended to nonadiabatic flame condition with radiation by introducing an enthalpy variable and the radiative heat loss is calculated by a local, geometry-independent model. The effects of turbulent fluctuation is taken into account by the joint assumed PDFs. Numerical model is based on the nonorthogonal body-fitted coordinate system and the pressure/velocity coupling is handled by PISO algorithm in context with the finite volume formulation. The present PSR-based turbulent combustion model has been applied to analyze the highly intense turbulent nonpremixed flame field in the double swirl combustor. The detailed discussions were made for the flow structure, combustion effects on flow structure, flame structure, and emission characteristics in the highly intense turbulent swirling flame of the double swirl burner.