Effects of properties of atmosphere diluents on cool-flame combustion of normal-alkane droplets
Effects of properties of atmosphere diluents on cool-flame combustion of normal-alkane droplets
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气氛稀释剂性质对正构烷烃液滴冷焰燃烧的影响
DOI：
10.1016/j.combustflame.2021.111408
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发表时间：
2021
影响因子：
4.4
通讯作者：
F. Williams
中科院分区：
文献类型：
--
作者：
V. Nayagam;D. Dietrich;F. Williams
在国际空间站使用正构烷烃燃料进行的液滴燃烧实验表明，大液滴在点燃时首先燃烧可见的热火焰，然后熄灭，随后才是准稳定的冷火焰燃烧。在其中一些实验中，对于正庚烷、正辛烷、正癸烷或正十二烷液滴，氮氧环境气体混合物中的一些氮气被氦气、二氧化碳或氙气取代。不同稀释剂对冷焰燃烧有不同的影响。这些最初意想不到的差异总结在这里，并解释其原因。特别是，一个简化的理论描述的冷火焰支持液滴燃烧预测燃烧速率常数和液滴直径在冷火焰熄灭，导致良好的协议与许多实验数据，但不同意某些测量，解释的原因。比较强调的重要影响的稀释剂，特别是对刘易斯数的冷焰中间物种来自燃料蒸气。
Droplet combustion experiments carried out in the International Space Station using n-alkane fuels have shown that large droplets, when ignited, first burn with visible hot flames and then extinguish, only to be followed later by quasi-steady cool-flame combustion. In a few of these experiments, some of the nitrogen in the nitrogen-oxygen ambient-gas mixture was replaced by helium, carbon dioxide, or xenon, for n-heptane, n-octane, n-decane, or n-dodecane droplets. Different diluents were observed to exert remarkably different influences on the cool-flame combustion. These initially unexpected differences are summarized here, with explanations offered for their causes. In particular, a simplified theoretical description of cool-flame-supported droplet combustion is employed to predict burning-rate constants and droplet diameters at cool-flame extinction, resulting in good agreement with much of the experimental data but disagreement with certain measurements, for reasons that are explained. The comparisons underscore the important influence of the diluent, especially on the Lewis numbers of cool-flame intermediate species derived from the fuel vapor.
影响因子：
1.3
作者：
F. Williams;V. Nayagam
通讯作者：
F. Williams;V. Nayagam
影响因子：
4.4
作者：
F. Williams;V. Nayagam
通讯作者：
F. Williams;V. Nayagam