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首页> 外文期刊>Combustion and Flame >A new diagnostic for hydrocarbon fuels using 3.41-mu m diode laser absorption
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A new diagnostic for hydrocarbon fuels using 3.41-mu m diode laser absorption

机译：使用3.41微米二极管激光吸收对烃类燃料进行新诊断

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摘要

We report the development of a novel laser absorption diagnostic for accurate, time-resolved and in situ measurement of various hydrocarbon fuels in combustion systems. This diagnostic method utilized a wavelength-tunable interband cascade laser operated near 3.41 mu m, providing improved performance in several aspects over the conventional 3.39-mu m He-Ne gas laser diagnostic. First, it enabled a simplified and more compact experimental setup that significantly reduced the measurement complexity. Second, it improved the long-term stability over the 3.39-mu m diagnostic by at least a factor of 2, leading to substantially reduced measurement uncertainties. Lastly, the new diagnostic also avoided a cluster of CH4 transitions that coincide with the He-Ne wavelength, and hence minimized CH4 interference in other hydrocarbon measurements. Absorption cross-sections of a variety of hydrocarbons at both 3.39 and 3.41 mu m were measured in a high-purity shock tube over 531-1659 K, 0.34-3.1 atm, and reported here as functions of temperature. Example applications of this new diagnostic in shock tube pyrolysis studies of methylcyclohexane, n-heptane and iso-octane are also presented. These studies have yielded an improved value of the overall decomposition rate constant of methylcyclohexane as k(d) = 3.3 x 10(15) exp(-38000K/T)s(-1)+28%/-34%, which is valid over 1260-1400 K and near 1.5 atm. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：我们报告了一种新型的激光吸收诊断技术的开发，该诊断技术可对燃烧系统中的各种烃类燃料进行准确，时间分辨和就地测量。这种诊断方法使用了波长可调的带间级联激光器，工作在3.41μm附近，与传统的3.39μmHe-Ne气体激光器诊断相比，在某些方面提供了改进的性能。首先，它实现了简化且紧凑的实验设置，从而大大降低了测量复杂性。其次，与3.39微米诊断相比，它的长期稳定性至少提高了2倍，从而大大降低了测量不确定度。最后，新的诊断程序还避免了与He-Ne波长重合的CH4跃迁簇，因此在其他烃类测量中将CH4干扰降至最低。在高纯度冲击管中，在531-1659 K，0.34-3.1 atm上测量了3.39和3.41μm处各种碳氢化合物的吸收截面，并在此报告为温度的函数。还介绍了该新诊断剂在甲基环己烷，正庚烷和异辛烷的激波管热解研究中的示例应用。这些研究得出了甲基环己烷的总分解速率常数的改进值，因为k（d）= 3.3 x 10（15）exp（-38000K / T）s（-1）+28％/-34％，这是有效的超过1260-1400 K，且接近1.5 atm。 （C）2017燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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