三种燃料在亚燃冲压燃烧室中的高空点火特性

为评估三种液体燃料(航空煤油(RP-3)、高热氧化安定性燃油(RP-3+100)以及煤基合成油(LUAN))的点火特性,在一种小型亚燃冲压燃烧室中开展了高空点火试验。研究表明:三种燃料在所选的试验条件下,均可以实现可靠点火。随着入口气流温度、压力的增加,三种燃料的点火当量比范围增加;随着入口气流速度的增加,三种燃料的点火当量比范围减小。RP-3+100在不同条件下均具有最高的点火当量比范围,RP-3与LUAN的点火当量比范围较为接近。当入口气流温度、压力和速度发生改变时,RP-3+100点火当量比范围随外界参数改变的变化程度最低,RP-3点火当量比范围随外界参数改变的变化程度最高。

High-altitude ignition characteristics of three fuels in ramjet combustor

To investigate the ignition characteristics of three liquid fuels (aviation kerosene (RP-3), high thermal oxidation stability fuel (RP-3+100), high-density liquid hydrocarbon fuel (LUAN)), high-altitude ignition simulated experiment in a small-scale ramjet combustor was conducted. The results showed that the three fuels can be ignited successfully under all selected conditions. With the increase of temperature and pressure of inlet air, the range of ignition equivalence ratio of three fuels became wider. But the increased velocity narrowed the range of ignition equivalence ratio. The range of ignition equivalence ratio of RP-3+100 was the widest among the three fuels at any time. RP-3 and LUAN had a similar range of ignition equivalence ratio. As the extraneous factors, like temperature, pressure, and velocity, changed, RP-3+100 had the narrowest variation of the range of the ignition equivalence ratio, while RP-3 was the widest one.