NUMERICAL-ANALYSIS OF THE FLOWFIELDS IN A STAGED GAS-TURBINE COMBUSTOR

The KIVA-II code was modified to allow calculation of the flowfields i n a staged gas turbine combustor including the air-blast fuel nozzle. The results illustrate the complicated flowfields present in staged co mbustors. In particular, the thermal protection requirements of the qu ick-quench mixer used in this study may be similar to those of the ric h-burn combustor, despite the presence of the cool dilution jet. Varia tion of the mass flow split between the fuel nozzle air passages has a significant effect on the velocity and temperature profiles. In addit ion, the slanted dilution slots form a counter-rotating flowfield. Fro m the results obtained to date, it appears that the modified KIVA-II c ode can be used to study the effects of various staged combustor desig ns and operating conditions.