突扩燃烧室在准稳态假设下的熄火过程对比分析  

Comparison of extinguishing process in dump combustor at the assumption of quasi-steady state

作　　者：席文雄[1] 王振国[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《火箭推进》2009年第2期25-29,共5页Journal of Rocket Propulsion

摘　　要：在准稳态假设条件下,运用数值模拟方法对火焰的边区驻留与旁侧驻留的两种突扩类型的亚燃冲压发动机燃烧室的熄火过程进行了分析。通过改变燃烧室进气流量和燃油当量比,对比分析了燃烧室在向熄火的压力下限和贫、富油边界转变过程中的流场特征和火焰形态变化。研究显示,中心突扩燃烧室在压力和燃油浓度下降过程中,熄火过程中表现为火焰锋面的中心收缩;旁侧突扩燃烧室则表现为突扩截面内温度的差异,以致火焰稳定功能的丧失。The process of flame-out in two kinds of flame-resident ramjet combustor, centerdump and side-dump combustor, were analyzed numerically at the assumption of quasi-steady state. The difference of flow field and the change of flame were discussed when the combustor works closely to the limits of pressure and kerosene concentration. It is found that flame front of center- dump combustor shrinking during the extinguish process. The side-dump combustor has a difference in the temperature of backflow region, which leads to the lose of flameholding.

关 键 词：火焰驻留 压力边界 贫/富油边界 熄火 

分 类 号：V434[航空宇航科学与技术—航空宇航推进理论与工程]