Combustion of Highly Strained Hydrocarbons: Non-Intrusive Isomer Specific Detection of Complex Combustion Intermediates

韦伯燃烧反应对于基础燃烧科学以及开发高效、清洁的发动机都具有重要意义。高度紧张的碳氢化合物特别令人感兴趣，因为它们是高能量密度燃料的候选者。现有的火焰成分分析技术，如真空紫外光电离质谱仪、红外光谱或拉曼光谱分析都很困难，因为分子在到达探测器的途中可能会发生异构化，或者火焰的高温使光谱过于复杂，难以分析。该项目开发了一种新的技术，里德堡指纹光谱，以识别火焰中的分子化合物。经过校准和与分子束光电离化实施的数据进行比较，该技术将使用雷达方法进行火焰中的分析。该技术实现了对复杂分子物种的非侵入性和原位检测，并显示了高度分辨率的光谱，这些光谱对分子结构敏感，而对温度不敏感。因此，该方法有希望在火焰的高温下对火焰成分进行采样。我们用式C7H8探索了四环烷和降冰片二烯的高应变碳氢化合物的燃烧。提出的火焰诊断新方法也可用于未来的燃烧科学研究和商业实施。该项目将涉及一名研究生，并构成学生S论文的基础。PI将与领导力联盟合作，这是一个总部设在布朗大学的全国性联盟，旨在提高本科生？对研究生教育和事业成功感兴趣。

1336105WeberCombustion reactions are of great importance for basic combustion science as well as for the development of efficient and clean engines. Highly strained hydrocarbons are of particular interest since they are candidates for high-energy density fuels. Established techniques for flame composition analysis, such as VUV photoionization mass spectrometry, IR or Raman spectroscopy are difficult because either the molecules can isomerizes on their way to a detector, or the high temperature of the flame makes spectra too complex to analyze. This project develops a novel technique, Rydberg Fingerprint Spectroscopy, to identify the molecular compounds in the flame. Following calibration and comparison with data from a molecular beam photoionization implementation, the technique will use a radar method for in-flame analysis. The technique enables non-intrusive and in-situ detection of complex molecular species and reveals highly resolved spectra that are molecular structure sensitive while being insensitive toward temperature. Consequently, the method is promising for sampling flame components at the high temperature of a flame. We explore the combustion of quadricyclane and norbornadiene, highly strained hydrocarbons with the formula C7H8. The proposed new method for flame diagnostics can also be used for future combustion science studies and for commercial implementations. The project will involve one graduate student and form the basis of the student?s dissertation. The PI will work with Leadership Alliance, a national consortium headquartered at Brown University enhancing undergraduate students? interest in pursuing graduate education and success in their careers.