The pyrolysis of propane plays an important role in determining the combustion properties of natural gas mixtures and offers insight into the cracking patterns of larger fuels. This work investigates propane pyrolysis behind reflected shock waves with a multiwavelength laser‐absorption speciation technique. Nine laser wavelengths, sensitive to key pyrolysis species, were used to measure absorbance time histories during the decomposition of 2% propane in argon between 1022 and 1467 K, 3.7‐4.3 atm. Absorbance models were developed at each diagnostic wavelength to interrogate common initial conditions, and time histories of all major species are reported at 1250, 1290, 1330, 1370, and 1410 K. Nearly complete carbon recovery observed at lower temperatures enabled the inference of hydrogen formation from atomic conservation, while decaying carbon recovery at high temperatures suggests the formation of allene and 1‐butene. The results show systematically faster pyrolysis than predicted by kinetic modeling and motivate further study into the kinetics of propane pyrolysis.

中文翻译：

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丙烷热解

丙烷的热解在确定天然气混合物的燃烧特性方面起着重要作用，并有助于洞察大型燃料的裂解方式。这项工作使用多波长激光吸收形态技术研究了反射冲击波背后的丙烷热解。在1022至1467 K，3.7-4.3 atm的氩气中2％丙烷在氩气中的分解过程中，使用九种对关键热解物种敏感的激光波长来测量吸收时间历史。在每个诊断波长处开发了吸光度模型以询问常见的初始条件，并且报告了所有主要物种的时间历史，分别为1250、1290、1330、1370和1410K。在较低温度下观察到几乎完全的碳回收，可以推断出氢的形成。从原子守恒 而在高温下降低碳的回收率则表明形成了丙二烯和1-丁烯。结果显示系统地热解比动力学建模所预测的快，并且激发了对丙烷热解动力学的进一步研究。