Laboratorial Reasearch And Numerical Simulation Of A Gas Turbine Annular Combustor With Dual-stage Swirler

In this paper combustion performances of the single-head annular combustor with different swirler cups are investigated by experiment and numerical simulation. Under different fuel-air ratios, profiles of exit temperature,combustion efficiency,lean blowout limit and pollutant emission are measured. Effects of different fuel-air ratios and different geometric parameters of dual-stage swirler (such as inner diameters of the primary swirl and secondary swirl passages,outer diameters of the secondary swirl passages,vane angle of the primary and secondary swirler,the distance of the flare exit from throat etc) on combustion performances are studied experimentally. The experimental results show that radial profiles of the outlet gas temperature,combustion efficiency,emissions of CO2,CO and NOX and lean blowout are affected with different degrees by the different geometric parameters of dual-stage swirler and the arrangement of primary holes. But the influence decreases with the reduction of fuel-air ratio.Cold and reacting flow fields are calculated using commercial software FLUENT. Numerical simulations are in agreement with the experimental data. It is shown that results of study are useful for the optimum design of an annular combustor with the swirler cup.