The ignition delay times of a research grade gasoline, RON95E10, are measured in a rapid compression machine and in a shock tube. The experiments are carried out for fuel/O₂/Ar/N₂ mixtures with two equivalence ratios of 0.77 and 1.18 at pressures between 20 and 40 bar over the temperature range of 700–1250 K. In particular, data are reported for two exhaust gas recirculation (EGR) loadings of 0 and 25% to demonstrate the impact of EGR on gasoline ignition delay times. The presented data are, to the authors’ knowledge, the first set of ignition delay times of real gasoline with EGR and at engine relevant high pressures covering the entire intermediate temperature range. A published gasoline mechanism (Cai and Pitsch, 2015) is modified as part of this study following the latest kinetic knowledge and is further used to compute the ignition delay times at the conditions experimentally investigated. The simulations employ a four-component surrogate consisting of n-heptane, iso-octane, toluene, and ethanol. It is shown that the proposed model predicts the total ignition delay times of gasoline accurately under various conditions and reflects correctly the influences of pressure, EGR, and equivalence ratio on ignition delay times, while it fails to predict the first stage ignition delay times with very high accuracy due to the neglect of the olefin and naphthene content in the surrogate formulation. Furthermore, the influence of exhaust gas addition on ignition delay times is analyzed and discussed in more detail using results from numerical simulations. The chemical impact of EGR is minor but not negligible and varies at different conditions depending on the EGR composition.

研究级汽油RON95E10的点火延迟时间是在快速压缩机和减震管中测量的。实验是针对燃料/ O ₂ / Ar / N _2进行的在700至1250 K的温度范围内，压力介于20和40 bar之间时，两种当量比为0.77和1.18的混合物。特别是，报告了两种废气再循环（EGR）负载为0和25％的数据，以证明其影响EGR对汽油点火延迟时间的影响。据作者所知，给出的数据是带有EGR且在发动机相关的高压下覆盖整个中间温度范围的纯汽油的第一组点火延迟时间。根据最新的动力学知识，将已发表的汽油机理（Cai和Pitsch，2015）作为本研究的一部分进行修改，并进一步用于计算在实验条件下的点火延迟时间。模拟采用由n组成的四分量替代庚烷，异辛烷，甲苯和乙醇。结果表明，所提出的模型能够准确预测各种条件下汽油的总点火延迟时间，正确反映了压力，EGR和当量比对点火延迟时间的影响，而无法很好地预测第一阶段的点火延迟时间。由于忽略了替代配方中的烯烃和环烷烃含量，因此具有很高的准确性。此外，使用数值模拟的结果分析并详细讨论了废气添加对点火延迟时间的影响。EGR的化学影响很小，但不能忽略，并且在不同的条件下会根据EGR的组成而变化。