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A combined laser absorption and gas chromatography sampling diagnostic for speciation in a shock tube

机译：组合的激光吸收和气相色谱采样诊断仪可对冲击管中的物质进行形态分析

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摘要

The first implementation of a combined laser absorption diagnostic/gas chromatography (GC) sampling system for the measurement of combustion-relevant species in a conventional shock tube configuration is reported, with ethylene pyrolysis as an example application. A heated, endwall sampling system is used to extract a post-shock sample for GC analysis. Analysis of the gas sample yields a measurement of the ultimate mole fraction values of multiple species (currently ethylene, acetylene, hydrogen, and methane) at the end of the reflected shock test time. A 10.532-µm laser absorption diagnostic is simultaneously used to measure time-resolved ethylene. A method to accurately model sampled speciation results using published kinetic models is discussed. A method for extending laser measurements into the expansion fan region for direct comparison with sampled GC results has also been developed. The combined optical and sampled-gas measurement techniques were used to study ethylene pyrolysis (1.0% mole fraction ethylene/argon) at approximately 5 atm, over a range of temperatures (1200–2000 K). The ethylene mole fraction measurements obtained using both techniques show close agreement.
机译：报道了用于测量传统冲击管配置中与燃烧有关的物种的组合激光吸收诊断/气相色谱（GC）采样系统的第一种实现方式，其中以乙烯热解为例。加热的端壁采样系统用于提取震荡后样品以进行GC分析。气体样品的分析可得出在反射冲击测试时间结束时多种物质（当前为乙烯，乙炔，氢和甲烷）的最终摩尔分数的测量值。同时使用10.532 µm激光吸收诊断仪测量时间分辨的乙烯。讨论了一种使用公开的动力学模型对采样的物种形成结果进行精确建模的方法。还开发了一种将激光测量结果扩展到扩展风扇区域以直接与采样的GC结果进行比较的方法。结合使用光学和采样气体测量技术，在温度范围（1200–2000 K）下，在大约5个大气压下研究乙烯热解（1.0％摩尔分数的乙烯/氩气）。使用两种技术获得的乙烯摩尔分数测量值显示出紧密的一致性。

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