Bio-based alternative fuels have received increasing attention with growing concerns about depletion of fossil reserves and environmental deterioration. The development of new combustion concepts in internal combustion engines requires a better understanding of autoignition characteristics of the bio-based alternative fuels. This study investigates two cases of alternative fuels, namely, a kerosene-type fuel farnesane and an oxygenated fuel, TPGME, and compares those fuels with full-boiling range of fuels with similar cetane number. The homogeneous autoignition and spray ignition characteristics of the selected fuels are studied using a modified CFR octane rating engine and a cetane rating instrument, respectively. When comparing farnesane with a full-boiling range counterpart (HRJ8), their similar cetane ratings result in comparable combustion heat release, but the overall ignition reactivity of farnesane is stronger than HRJ8 during the pre-ignition process. Results from a constant volume spray combustion chamber indicate that the spray process of farnesane and HRJ8 strongly influences the overall ignition delay of each fuel. Despite the similar cetane ratings of TPGME and n-heptane, TPGME shows greater apparent low-temperature oxidation reactivity at low compression ratios in the range from CR 4.0-5.5 than n-heptane. A simplified model focused on the key reaction pathways of low-temperature oxidation of TPGME has been applied to account for the stronger low-temperature reactivity of TPGME, supported by density functional theory (DFT) calculations. Regardless of the similar cetane ratings of the fuels, n-heptane and JP-8/SPK lead to similar total ignition delay times, while TPGME shows the shortest overall ignition delay times in the constant volume combustion chamber.

生物基替代燃料受到越来越多的关注，对化石储量的枯竭和环境恶化的担忧日益增加。内燃机中新的燃烧概念的发展要求对生物基替代燃料的自燃特性有更好的了解。这项研究调查了两种情况下的替代燃料，即煤油型燃料法呢烷和含氧燃料TPGME，并将这些燃料与十六烷值相似的全沸程燃料进行了比较。分别使用改进的CFR辛烷值发动机和十六烷值测定仪研究所选燃料的均质自燃和喷雾点火特性。当将法呢烷与全沸程对应物（HRJ8）进行比较时，它们的十六烷值相似，可产生相当的燃烧热释放，但在点火前过程中，法呢烷的整体点火反应性比HRJ8强。恒定体积喷雾燃烧室的结果表明，法呢烷和HRJ8的喷雾过程强烈影响每种燃料的总点火延迟。尽管TPGME和正庚烷的十六烷值相似，但是TPGME在CR 4.0-5.5范围内的低压缩比下仍显示出比正庚烷更高的表观低温氧化反应性。在密度泛函理论（DFT）计算的支持下，简化模型专注于TPGME低温氧化的关键反应途径，已被用来说明TPGME较强的低温反应性。不管燃料的十六烷值是否相近，