In this work, two-dimensional -dodecane/air/nitrogen cellular detonations are simulated with various equivalence ratios (ERs). A skeletal mechanism consisting of 54 species and 269 reactions is used. The lower and upper equivalence ratio boundaries for self-sustained detonation are 0.3 and 2.2, respectively. Detonation with different regimes characterized by the detonation cell patterns is observed, which aligns well with the category based on the stability parameter, i.e., weakly and highly unstable detonations, and extinction. In terms of the frontal structure, non-negligible effect of diffusion on the cellular detonation is revealed, especially in the vicinity of the leading shock front. In highly unstable and quenched detonations, the alternation in reaction pathway within the induction zone accounts for the changes of detonation dynamics, such as the absence or extended sequence of important radical formation, e.g., OH. In addition, the composition of the unburned pockets depends on both pocket location from the leading shock front and the ER in the fresh mixture, because the former determines the residence time, whilst the latter affects the pocket reaction rate.

中文翻译：

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正十二烷/氧/氮细胞爆炸的模拟

在这项工作中，用各种当量比（ER）模拟了二维十二烷/空气/氮气细胞爆炸。使用由 54 个物种和 269 个反应组成的骨架机制。自持爆轰的下当量比边界和上当量比边界分别为 0.3 和 2.2。观察到以爆轰单元模式为特征的不同状态的爆炸，这与基于稳定性参数的类别（即弱和高度不稳定的爆炸以及灭绝）很好地吻合。就锋面结构而言，扩散对细胞爆炸的不可忽视的影响被揭示出来，特别是在前激波锋面附近。在高度不稳定和猝灭的爆炸中，感应区内反应路径的交替导致了爆炸动力学的变化，例如重要自由基形成的不存在或延长的序列，例如OH。此外，未燃烧的袋的组成取决于袋从前激波前沿的位置和新鲜混合物中的ER，因为前者决定停留时间，而后者影响袋的反应速率。