Abstract Methyl decanoate (MD), a widely used surrogate of biodiesels, was investigated for its autoignition characteristics using a heated rapid compression machine (RCM). In this study, the ignition delay times (IDTs) of MD were measured at the compressed pressures of 5–20 bar, equivalence ratios varying from 0.53 to 1.60 and compressed temperatures of 633–855 K. An obvious two-stage ignition behavior was observed at low temperatures and typical negative temperature coefficient (NTC) phenomenon of total IDT was experimentally captured. The influences of compressed pressure, fuel and oxygen content, and nitrogen concentration on ignition delay times were systematically studied. The simulation results of Herbinet’s mechanism and Grana’s mechanism under variable volume simulation were compared with the experimental data. It is found that the two mechanisms qualitatively predict the autoignition features of MD but still need further optimization. In addition, reaction pathway analysis and sensitivity analysis were conducted to offer further insight into the low-to-intermediate temperature autoignition chemistry of MD.

中文翻译：

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使用快速压缩机的癸酸甲酯自燃研究

摘要 癸酸甲酯 (MD) 是一种广泛使用的生物柴油替代品，使用加热快速压缩机 (RCM) 研究了其自燃特性。在这项研究中，MD 的点火延迟时间 (IDT) 在 5-20 bar 的压缩压力、0.53 到 1.60 的当量比和 633-855 K 的压缩温度下测量。 观察到明显的两阶段点火行为在低温下，通过实验捕获了总 IDT 的典型负温度系数 (NTC) 现象。系统研究了压缩压力、燃料和氧气含量以及氮气浓度对点火延迟时间的影响。将Herbinet机构和Grana机构在变容积模拟下的模拟结果与实验数据进行了对比。发现这两种机制定性地预测了MD的自燃特征，但仍需进一步优化。此外，还进行了反应途径分析和敏感性分析，以进一步了解 MD 的中低温自燃化学。