双旋流模型燃烧室的燃烧特性

同轴双旋流进气能建立起有利于燃烧的流场,文献1]的结果表明,同轴的内外两股旋流反向旋转时,边界层内的紊流强度和雷诺应力很高,对强化混合和燃烧有利。据文献2]报导,用这种双旋流改装了JT-8D火焰筒,取消了火焰筒上的主燃孔与掺混孔,试验实测的慢车状态燃烧效率高达99%。表明这种燃烧室方案在燃气轮机和工业燃烧装置中有着广阔的应用前景。本文重点研究两个径向式叶片旋流器在同轴反向旋转条件下的燃烧特性,包括燃烧效率、熄火边界和出口温度场等。 

COMBUSTION CHARACTERISTICS OF A DOUBLE SWIRLER COMBUSTOR

The combustion characteristics at atmospheric pressure for a co-axial double swirler combustor have been investigated.The results show that its combustion performances can be significantly improved by increasing properly swirl number for inner swirler,as outer and inner flows are counter-rotating;the annular recirculation zone is a good source for flame stabilization,which is a important factor for extenting the weak extinction limit;The temperature distribution at the exit section of the combustor can be controlled by varying fuel-air ratio of outer and inner swirling flows.