第2级径向旋流器旋流数对燃烧室点火和贫油熄火性能的影响

双级旋流器是航空发动机燃烧室头部产生回流区所采用的主要形式,研究主要考察第2级径向旋流器的旋流数对点火与燃烧稳定性能的影响,数值模拟结果能够较好地匹配第2级径向旋流器设计参数.试验研究表明:第2级径向旋流器旋流数的改变对燃烧室点火性能无影响;但减小该旋流数会对贫油熄火性能产生明显地改善,旋流卷吸效果会影响回流区火焰稳定.减小第2级径向旋流器旋流数,使下游卷吸量增加,回流区流动与火焰匹配更好,更有利于燃烧稳定性的提高. 

Effects of swirl number of second stage radial swirler on combustor ignition and lean blow-out performances

Twin-swirler is used as a major form in aero-engine combustor dome to make a recirculation zone. The effects of the swirl number of the second stage radial swirler on ignition and combustion stability performance were mainly studied. The numerical simulation results were validated well with the design parameters of the second stage radial swirler. Experimental studies show that the swirl number of the second stage radial swirler has no effect on the combustor ignition performance. However, the decrease of this swirl number will obviously improve the lean blow-out performance. The entrainment effect of swirl would impact the flame stabilization in the recirculation zone. Decreasing swirl number of the second stage radial swirler can increase the downstream entrainment and optimize the matching between the flow and flame in the recirculation zone, and this is more beneficial to improve the combustion stability.