Influence of the first stage swirler number on the aero-engine combustor ignition/blow-out performance

The two-staged axial swirler is a device commonly used to generate a suitable recirculation flow field in the design of the aero-engine combustor, and the swirl intensity of the first and second swirler has a significant impact on the performance of the combustor. The ignition and lean blow-out performance of the combustor affected by the first swirler was investigated on the sector combustor. The results show that the aero-engine combustor ignition performance gradually improves with the increasing of the first stage swirler number at aground condition. For high-altitude, there is a critical swirler-number value of the first swirler number which has an important influence on the lean ignition performance of the combustor, and when the first stage swirler number is less than this critical value, the ignition performance of the combustor will be improved, while the critical value is exceeded, the ignition performance almost remains stable. As the swirl number of the first stage swirler number increases in the range of studied number, the lean blow-out performance will gradually deteriorate.