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在直连式超燃实验台上开展来流马赫数为2.5,总温为1 650K的液态煤油燃料点火实验.在未使用引导氢气的情况下,利用输入能量为1.5kW的电弧等离子体炬实现煤油可靠点火和稳定燃烧.研究了煤油的不同喷注位置、喷射压力对点火性能的影响.实验表明:燃料喷口距离点火凹腔为550mm,喷射压力为1.5～2.3MPa时,可成功点火,更近的喷射位置和更高的喷射压力无法点火,分析认为点火凹腔的局部混合特征是影响点火的关键因素.根据点火和火焰前传的高速摄影图,发现下游凹腔在点火初期的作用不大,但是对于稳定燃烧和火焰前传有重要作用.
In a direct-coupled test bed, a liquid kerosene fuel ignition test with a Mach-number of 2.5 and a total temperature of 1 650 K was carried out using an arc plasma torch with an input energy of 1.5 kW without using a direct hydrogen gas The kerosene is ignited reliably and the combustion is stable.The influence of different injection position and injection pressure of kerosene on the ignition performance is studied.The experiment shows that the fuel nozzle can ignite successfully when the injection cavity is 550mm and the injection pressure is 1.5-2.3MPa Near the injection position and higher injection pressure can not be ignited, analysis of the local characteristics of the ignition cavity is a key factor affecting the ignition.According to the high-speed photographic images of ignition and flame propagation, found that the lower cavity in the ignition early role is not , But it plays an important role in stabilizing combustion and flame propagation.