Comprehensive Shock Tube Studies of Current Combustion Kinetics Problems Over Extreme Ranges of Pressure and Temperature

KENNETHCTS-9974308这是一项与煤烟形成相关的碳氢化合物化学研究。该方法以高压激波管装置中的单脉冲激波管研究为中心，该高压激波管装置旨在允许根据明确定义的压力、温度和停留时间的函数来提取淬火反应中间体和产品。提取的样品用气相色谱/质谱仪(GC/MS)进行分析。另外的研究是在低压激波管中进行的，其中反应诊断的主要手段是激光纹影测速法。研究了三个体系：(1)苯化学，包括邻苯二甲酸酐的原位热裂解生成苯及其随后的热解，以研究其作为芳烃化学中的一种分解途径的作用，以及作为一种可能的途径通过联苯生成更大分子的途径；(2)二乙炔的热解，包括用激波管研究稀二乙炔/Ar和稀二乙炔/乙炔/Ar混合物，以研究在二乙炔存在下碳烟的形成机理；以及(3)1，5-己二炔的反应，包括1，5-己二炔的激波管研究，以区分不同的苯的替代途径。

ABSTRACTBREZINSKY, KENNETHCTS-9974308This is a study of hydrocarbon chemistry related to soot formation. The approach is centered on single-pulse shock-tube studies in a high-pressure shock-tube facility designed to permit extraction of quenched reaction intermediates and products as functions of well-defined pressures, temperatures, and residence times. Extracted samples are analyzed with gas chromatography/mass specteometry (GC/MS). Additional studies are conducted in a low-pressure shock tube where the principal means of reaction diagnosis is the laser schlieren method of rate evaluation. Three systems are studied: (1) benzyne chemistry including in-situ pyrolysis of phthalic anhydride to produce benzyne and its subsequent pyrolysis to examine its role both as a decomposition pathway in aromatics chemistry and as a possible route to larger molecule formation through biphenylene; (2) diacetylene pyrolysis including shock-tube studies of dilute diacetylene/argon and dilute diacetylene/acetylene/argon mixtures to examine the mechanism of soot formation in the presence of diacetylene; and (3) reactions of 1,5-hexadiyne including shock-tube studies of 1,5-heaxdiyne to discriminate among alternate pathways to benzene.