论文部分内容阅读
在直连式脉冲燃烧风洞设备上,开展了模拟马赫数为4,总温为935K的超燃发动机碳氢燃料点火试验.试验利用了点火器加引导氢气、引导氢气自燃辅助点火、节流加引导氢气3种辅助点火方式成功实现了乙烯燃料的点火并维持了稳定燃烧.试验研究发现:利用氢气自燃辅助乙烯点火,氢气质量流量范围为0.43～12.61g/s,氢气质量流量过大不能成功点火;利用节流加引导氢气的辅助点火方式,节流量为10%～30%,氢气注油压力为5MPa能够可靠点火.最后研究了乙烯从凹槽上游和从凹槽底部注油的发动机贫油点火极限和富油工作极限,研究发现两者的贫油熄火极限相近,为当量比为0.077,而富油工作极限差别较大,当量比分别为0.327和0.471.
In direct-fired pulse combustion wind tunnel equipment, a test was carried out to simulate the ignition of a hydrocarbon fuel for a super-combustion engine with a simulated Mach number of 4 and a total temperature of 935 K. The pilot used an igniter plus a pilot hydrogen gas to direct hydrogen autoignition to assist ignition and throttling The pilot study found that: the use of hydrogen auto-ignition auxiliary ethylene ignition, hydrogen mass flow range of 0.43 ~ 12.61g / s, the hydrogen mass flow can not be too large The successful ignition; using throttling plus the introduction of hydrogen auxiliary ignition mode, throttling capacity of 10% to 30%, hydrogen injection pressure of 5MPa can be reliably ignited.Finally studied the ethylene upstream from the groove and from the bottom of the groove of the engine oil leaking Ignition limit and oil-rich working limit, the study found that both the lean-off limit is similar, for the equivalence ratio of 0.077, while the oil-rich working limits vary greatly, equivalent ratio was 0.327 and 0.471.