Experiment on variable-frequency-energy ignition performance ofinternally-staged combustor

At ambient temperature and pressure, the ignition performance of the internally-staged combustor under different ignition energy and ignition frequency combinations was experimentally investigated. The ignition energy values ranged from 1J to 15J, the ignition frequency values ranged from 1Hz to 15Hz, and air pressure drop remained at 1.5%. The experimental results indicated that, as the ignition energy increased, the excess air coefficient of lean ignition increased rapidly at first and then increased slowly, while the ignition delay time was shortened sharply and then slowly. As the ignition frequency increased, the excess air coefficient of lean ignition increased slowly, and the ignition delay time was shortened rapidly and then slowly, this regularity was more pronounced at lower ignition energy. When the ignition power was greater than 35 W, increasing the ignition power had little significance to improve the ignition performance, and the ignition energy had more significant effect on ignition performance than ignition frequency; under the same ignition power, it was better to raise the ignition energy to improve the ignition performance. A model of ignition based on Lefebvres and WANG Yanshengs ignition models was obtained by combustor reference velocity, Sauter mean diameter, ignition energy and ignition frequency, and the prediction error of the model was controlled within ±10%.