Flame-Holding Configurations for Kerosene Combustion in a Mach 1.8 Airflow
Flame-Holding Configurations for Kerosene Combustion in a Mach 1.8 Airflow
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DOI：
10.2514/2.5322
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发表时间：
1998-07
影响因子：
1.9
通讯作者：
M. Owens;S. Tehranian;C. Segal;V. Vinogradov
中科院分区：
文献类型：
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作者：
M. Owens;S. Tehranian;C. Segal;V. Vinogradov
本研究的目的是确定在壁腔中形成的再循环区域中气体的稳定性，通过在腔底部注入氢气和在沿通向腔的壁形成的边界层上游注入煤油来点火。实验条件，即马赫数 1.8 和空气停滞温度达到 1000 K，对应于高超音速飞行状态的开始，也称为冷启动条件。在测试过程中调节氢气和预注入煤油的流量，放置在腔中的温度探针表明它们对局部当量比的影响。煤油的预喷射通过增加进入再循环区域的新鲜空气的夹带来降低低空气停滞温度下的局部当量比。在高温下，煤油的存在带来的额外燃料会对空腔中的火焰稳定性产生不利影响。
The goal of this study was to determine the stability of the ame in a recirculation region formed in a wall cavity with ignition provided by hydrogen injected in the base of the cavity and injection of kerosene upstream in the boundary layer formed along the wall leading to the cavity. The experimental conditions, i.e., Mach 1.8 and air stagnation temperatures to 1000 K, correspond to the beginning of the hypersonic ight regime also referred to as cold start conditions. The hydrogen and the preinjected kerosene ow rates were modulated during the tests and temperature probes placed in the cavity indicated their effect on the local equivalence ratio. Preinjection of kerosene reduced the local equivalence ratio at low air stagnation temperature by increasing the entrainment of fresh air into the recirculation region. At high temperatures the additional fuel brought by the presence of kerosene had a detrimental effect on the stability of the ame in the cavity.