M3条件下乙烯燃料超燃冲压发动机空气节流点火试验

Air-Throttling Ignition Experiments of Ethylene Fueled Scramjet at Mach 3

关键词:  超燃冲压发动机  空气节流  点火  节流流量  节流时间  定量分析 

Key words:  Scramjet  Air-throttling  Ignition  Throttling mass flux  Throttling duration  Quantitative analysis

摘要:

在隔离段入口Ma=3(模拟飞行马赫数6.5)条件下,采用乙烯燃料的超燃冲压发动机点火十分困难。为解决该难题,采用了空气节流作为辅助点火措施。基于脉冲燃烧风洞直连式试验平台进行了空气节流点火试验,通过壁面压力测量,获得了节流点火的火焰发展历程。以点火时间为指标,对节流流量、乙烯当量比、节流时间等参数进行了定量分析,节流流量的调节范围为0%~45%,乙烯当量比调节范围为0.6~1.2,节流时间调节范围为190~350ms。分析了三个节流参数各自的作用机理,通过数据拟合,绘制了节流流量与点火时间、乙烯当量比与点火时间的关系曲线,揭示了节流时间与点火时间的关系。 

Abstract:

With the Ma=3inflow conditions at isolator entry (simulating flight Ma=6.5), it is difficult to ignite ethylene fueled scramjet. Thus, air-throttling strategy was used in the ignition experiments conducted at the pulse combustion wind tunnel facility of China Aerodynamics Research and Development Center (CARDC). The time history of combustion was obtained through wall pressure measurement. The quantitative analysis of the effects of throttling mass flux, ethylene equivalence ratio and throttling duration on ignition were conducted with the index of ignition time. The influence of throttling mass flux was checked at the range of 0%~45%, with ethylene equivalence ratio range of 0.6~1.2and throttling duration range of 190ms~350ms. All of the three throttling parameters were examined intensively to explore their mechanisms of facilitating ignition. The evolution curves of ignition time with throttling mass flux and ignition time with ethylene equivalence ratio were drawn by data fitting. Also the relationship between ignition time and throttling time was analyzed. 