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Self Ignition of Hydrogen-Air Mixtures with Inclined Porthole Injection in Supersonic Flows

机译:超声速流动中倾斜舷窗注入的氢气-空气混合物的自燃

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摘要

Experiments were performed in the T4 shock tunnel to investigate the self ignition of hydrogen in a supersonic air stream. Hydrogen was injected into the flow over an inclined flat plate for oncoming Mach numbers of 7.9 to 8.0. The nozzle-supply enthalpy was kept between 3.1 and 3.4 MJ/kg and two different pressure levels were used in the tests. Measurements of surface pressures were used to infer the location of ignition but only small pressure increases were obtained when combustion occurred. Therefore multiple tests at nominally the same condition were used so that statistical methods could be used to identify the ignition lengths. The ignition lengths of the hydrogen air mixture directly behind a strong leading edge shock indicate that Pergament's method is able to predict the ignition length to within 35% for the observed autoignition over the range of conditions tested.
机译:在T4冲击隧道中进行了实验,以研究超音速气流中氢的自燃。将氢注入到倾斜平板上的流动中,以使马赫数为7.9至8.0。喷嘴供应焓保持在3.1至3.4 MJ / kg之间,并且在测试中使用了两种不同的压力水平。表面压力的测量被用来推断着火的位置,但是当燃烧发生时,只有很小的压力增加。因此,在名义上相同的条件下进行了多次测试,以便可以使用统计方法确定点火长度。直接在强烈的前缘冲击之后的氢气混合气的点火长度表明,Pergament的方法能够在所测试的条件范围内,对于观察到的自燃,能够预测点火长度在35%以内。

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