中文摘要：

为了建立可靠的燃料替代模型，本文选择了正癸烷以及甲苯作为链烷烃与芳香烃的代表，系统研究了这两种燃料混合物的非稳态着火过程，分析了燃料中甲苯含量以及标量扩散率对着火延迟时间的影响。研究结果显示，较大的甲苯含量以及标量扩散率都会增加系统的着火延迟时间。文中揭示了由甲苯含量变化导致的化学反应特性以及由拉伸率变化导致的输运特性对着火过程的影响。

英文摘要：

In order to develop reliable surrogate fuel models, n-decane and toluene were chosen as the representatives of alkanes and aromatic hydrocarbons respectively. The unsteady ignition process of these two fuels was systematically investigated. The effects of toluene addition and scalar dissipation rate on the ignition delay time were analyzed. It was found that the toluene addition and dissipation rate both increase the ignition delay time. Moreover, the present work demonstrated the chemical effects due to toluene addition and the transport effects related to stretch rate on the ignition process.