Ethanol Kinetic Model Development and Validation at Wide Ranges of Mixture Temperatures, Pressures, and Equivalence Ratios

A new detailed kinetic model of ethanol with 107 species and 1795 reactions was developed using a reaction mechanism generator and extensively validated against measured ignition delay times, laminar flame speeds, and time-resolved species concentrations. Ignition delay experiments were conducted at pressures of 15, 20, and 30 bar, a temperature range of 850–1000 K, and equivalence ratios of 0.5, 1.0, and 2.0 using an optically accessible rapid compression machine. The effect of oxygen concentration on the ignition delay at a fixed equivalence ratio was also measured and investigated using the new kinetic model. A high-speed camera was used to investigate the autoignition process and chemiluminescence emission at low-to-intermediate temperatures. Different combustion behaviors with respect to the chemiluminescence color and intensity were identified and briefly explained. The new combustion kinetic model predicted the measured data from this work and those available in the literature quite well.本研究借助反应机理生成器（reaction mechanism generator），构建了一款包含107种组分、1795个反应的乙醇详细动力学模型，并针对实测得到的点火延迟时间、层流火焰速度以及时间分辨组分浓度数据开展了全面验证。本研究采用可视式快速压缩机开展点火延迟实验，实验压力设置为15、20、30 bar，温度区间为850~1000 K，当量比分别为0.5、1.0和2.0。此外，本研究还针对固定当量比下氧浓度对点火延迟时间的影响开展了实测，并结合所构建的新型动力学模型开展了相关分析。研究采用高速相机对中低温区间内的自燃过程与化学发光辐射特性进行了观测分析。本研究识别出了与化学发光颜色、强度相关的不同燃烧行为，并对其进行了简要阐释。所构建的新型燃烧动力学模型可较好地复现本研究实测数据与现有文献公开的相关数据集。