Abstract Ignition delay times of C2H6/O2/Ar mixtures with NO2 concentration changing from 0 to 2100 ppm were measured at T = 772–980 K, φ = 0.5–2.0 and p = 15–30 bar in a rapid compression machine. In general, the results show that NO2 addition significantly promotes ethane ignition and reduces its global activation energy. And NO2 promoting effect is more remarkable at fuel-lean and low-pressure condition at given NO2 concentration. The results also demonstrate that pressure shows smaller effect on the ignition of mixtures doped with NO2 than those on neat ethane ignition. Three literature NOx models are selected to validate against the new measured data set to evaluate their performances. Finally, sensitivity and flux analyses are conducted to identify the key reaction classes controlling the ignition of C2H6-NO2 mixtures.

中文翻译：

---

二氧化氮添加对不同压力和当量比下乙烷自燃的影响：实验和化学动力学模型

摘要 在快速压缩机中，在 T = 772–980 K、φ = 0.5–2.0 和 p = 15–30 bar 下，测量了 C2H6/O2/Ar 混合物在 NO2 浓度从 0 到 2100 ppm 变化时的点火延迟时间。总的来说，结果表明 NO2 添加显着促进了乙烷的点火并降低了其整体活化能。并且在给定的NO2浓度下，NO2促进作用在贫油和低压条件下更为显着。结果还表明，压力对掺杂 NO2 的混合物点火的影响小于对纯乙烷点火的影响。选择了三个文献 NOx 模型来验证新的测量数据集以评估其性能。最后，进行灵敏度和通量分析以确定控制 C2H6-NO2 混合物点火的关键反应类别。