Abstract Soot particles and their precursor polycyclic aromatic hydrocarbon (PAH) species, formed during combustion, are responsible for particulate emissions in gasoline direct injection (GDI) engines. To better understand the effects of fuel composition on formation of soot in GDI engines, the pyrolysis of several gasoline surrogates was studied in a jet-stirred reactor across a broad temperature range at atmospheric pressure and 1 s residence time. Fuel and intermediate species, including aromatics up to naphthalene, were measured using gas chromatography (GC). PAH concentrations from pyrolysis of surrogate fuels were compared to gain insight into the effects of fuel composition on PAH formation. In addition, synergistic effects were observed in pyrolysis experiments of binary blends. A detailed kinetic model, recently developed at Lawrence Livermore National Laboratory (LLNL), successfully captured the effects of blending and the concentration of major PAHs. Major reaction pathways are discussed, as well as the role of important intermediate species, such as acetylene, and resonantly stabilized radicals such as allyl, propargyl, cyclopentadienyl, and benzyl in the formation of PAH.

中文翻译：

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汽油替代物的喷射搅拌反应器热解形成多环芳烃

摘要 燃烧过程中形成的碳烟颗粒及其前体多环芳烃 (PAH) 物质是汽油直喷 (GDI) 发动机中颗粒排放的原因。为了更好地了解燃料成分对 GDI 发动机中碳烟形成的影响，在大气压和 1 秒停留时间下，在喷气搅拌反应器中，在宽温度范围内研究了几种汽油替代物的热解。使用气相色谱 (GC) 测量燃料和中间体，包括芳烃直至萘。比较了替代燃料热解产生的 PAH 浓度，以深入了解燃料成分对 PAH 形成的影响。此外，在二元混合物的热解实验中观察到了协同效应。详细的动力学模型，最近在劳伦斯利弗莫尔国家实验室 (LLNL) 开发，成功捕获了混合和主要多环芳烃浓度的影响。讨论了主要的反应途径，以及重要的中间体（如乙炔）和共振稳定的自由基（如烯丙基、炔丙基、环戊二烯基和苄基）在 PAH 形成中的作用。