头部回流区对燃烧室点火性能的影响研究

Efiect of Head Reflux Zone on Ignition Performance of Combustion Chamber

采用粒子图像测速仪(PIV)测量了燃烧室头部回流区的流场,获得了不同位置的速度分布关系,开展了2种型号燃烧室的点火试验,对比了点火性能的优劣。研究表明:燃烧室点火电嘴生成的初始火核必须穿越头部回流区的边界,进入回流区内部,才能实现成功点火,燃烧室头部回流区相互独立和饱满,有利于提高点火性能。燃烧室点火的最佳位置位于头部回流区低压中心的正上方。

Particle image velocimetry(PIV)was used to measure the flow field in the head reflux zone of the combustor,and the velocity distribution at different positions was obtained.The ignition tests of two types of combustion chambers were carried out,and the advantages and disadvantages of ignition performance were compared.The results show that the initial fire core generated by the ignition nozzle of the combustion chamber must pass through the boundary of the head reflux zone and enter the interior of the head reflux zone in order to achieve successful ignition.The head reflux zone of the combustion chamber is independent and full,which is conducive to improving the ignition performance.The best ignition position of the combustion chamber is directly above the low pressure center of the head reflux zone.