中心分级燃烧室变频变能点火性能试验

对中心分级燃烧室常温常压下变频变能点火性能进行了试验研究,点火能量为1~15J,点火频率为1~15Hz,燃烧室压降1.5%。结果表明:随着点火能量增大,贫油点火余气系数先迅速增大后缓慢增大,点火延迟时间先急剧缩短后缓慢缩短,随点火频率增大,贫油点火余气系数缓慢增大,点火延迟时间先迅速缩短后缓慢缩短,点火能量较低时该规律更为显著；当点火功率大于35W时提高点火功率对提高点火性能意义不大,点火能量对点火性能的影响较点火频率更为显著,相同功率下提高点火能量对点火更有利；基于Lefebvre、王延胜等人的点火模型,拟合了中心分级燃烧室关于燃烧室参考速度、索太尔平均直径、点火能量和点火频率的点火模型,模型预测误差在±10%以内。 

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%.