Shock Tube Studies of Soot Chemistry Over Extreme Ranges of Pressure and Temperature

这是对碳烟形成机理的研究。进行了激波管实验，以阐明单环、双环和多环系统中几条假设路径的重要性。使用了两种不同的激波管：一种是单脉冲高压激波管，可通过采样和气体计时光谱分析进行物种分析；另一种是配备了激光纹影和激光闪光吸收分析的“低压”激波管。所研究的体系包括1，5-己二炔的分解、炔丙基自由基的复合、苯酐热解生成的苯炔的反应以及二乙炔和二乙炔/乙炔混合物的化学包括多环芳烃(PAHs)的形成。在广泛的温度和压力范围内，环形成途径的阐明和相关动力学参数的量化导致了碳烟形成模型的改进。

This is a study of the mechanisms of formation of soot. Shock-tube experiments designed to clarify he importance of several hypothesized pathways for single-, double-, and multiple-ring systems are performed. Two different shock tubes are used: a single-pulse, high-pressure shock tube with species analysis by sampling and gas chronstography/mass spectrometry, and a "low pressure" shock tube equipped for laser schlieren and laser flash absorption analysis. Systems studied include the decomposition of 1, 5-hexadiyne, recombination of propargyl radicals, reactions of benzyne generated by pyrolysis of phthalic anhydride, and the chemistry of diacetylene and diacetylene/acetylene mixtures including formation of polycyclic aromatic hydrocarbons (PAHs). Elucidation of ring formation pathways and the quantification of related kinetic parameters over wide range of temperature and pressure leads to improved models of soot formation.