Experimental study of effects of geometric parameters on combustion performance of dual-stage swirler combustor

Under different fuel-air ratios, the effects of geometric parameters of dual-stage swirler and the arrangement of primary holes, on combustion performance(exit temperature distribution, combustion efficiency, lean blowout limit and pollutant emission) of single-head rectangle combustor are studied experimentally.The experimental results show that, the geometric parameters of dual-stage swirler and the arrangement of primary holes(swirler passage area, swirl vane angle of the primary and secondary swirler, the distance of the flare exit from throat, etc) have great influence upon the combustion performance of combustor, but the effects decrease with the reduction of fuel-air ratio.