Numerical study of influences of primary jets on turbulent flows and spray combustion in model combustor

The influences of different primary jets on turbulent flows and spray combustion of a dual swirl model combustor were numerically studied. The three-dimensional block-structured grids were generated by the differential equation method and sub-regional method for a model combustor including a dump diffuser, cowl, dual-stage axial swirler, flame tube as well as outer and inner annuluses. In arbitrary curvilinear coordinates, a multi-zone coupling approach was used for model combustor flow field numerical investigation. RNG (re-normalization group) k-ε model and EBU (eddy break-up) turbulent combustion model were employed for turbulent combustion. The particle trajectory model was applied to simulating two-phase flows. Comparisons between predicted and experimental data show that simulation is appropriate for predicting turbulent cold and combustion flow field. The influences of different primary hole structure parameters on gas temperature distributions are more obvious than the size of recirculation zone and profiles of velocity, and profile of exit temperature of the primary hole Ⅱ is more rational than those of other primary holes.