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

1336105韦伯燃烧反应对基础燃烧科学和高效清洁发动机的发展具有重要意义。高度应变的碳氢化合物特别令人感兴趣，因为它们是高能密度燃料的候选者。现有的火焰成分分析技术，如VUV光电离质谱，IR或拉曼光谱都很困难，因为分子在到达探测器的途中会异构化，或者火焰的高温使光谱太复杂而无法分析。本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。在与分子束光电离实现的数据进行校准和比较之后，该技术将使用雷达方法进行火焰分析。该技术可以实现非侵入式和原位检测复杂分子物种，并显示高度分辨的光谱，这些光谱对分子结构敏感，而对温度不敏感。因此，该方法有望在火焰的高温下对火焰成分进行采样。我们探索了四环烷和降冰片二烯的燃烧，这是一种分子式为C7H8的高应变碳氢化合物。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，并构成学生的基础？论文。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，旨在提高本科生的素质。对研究生教育和事业成功的兴趣。

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.