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

这是对烟灰形成机理的研究。激波管实验旨在澄清几个假设途径的重要性为单，双，和多环系统进行。使用两种不同的激波管：一种是单脉冲高压激波管，通过采样和气体计时/质谱法进行物种分析，另一种是“低压”激波管，用于激光纹影和激光闪光吸收分析。研究的体系包括1,5 -己二炔的分解、丙炔自由基的重组、邻苯二酸酐热解生成的苯的反应、二乙炔和二乙炔/乙炔混合物的化学反应，包括多环芳烃（PAHs）的形成。在较宽的温度和压力范围内，环的形成途径的阐明和相关动力学参数的量化导致了烟尘形成模型的改进。

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.