This paper describes a study on the autoignition of three pentane isomers (n-, neo- and iso-pentane) in a Cooperative Fuel Research (CFR) engine operating at standard, ASTM knocking conditions. The Research Octane Numbers (RONs) of these three fuels are first measured and compared to historical data. Autoignition of pentane/air mixtures in the CFR engine are then simulated using a two-zone model with detailed chemical kinetics. Initial and boundary conditions for these kinetic simulations are systematically calibrated using engine simulation software. Two published, detailed kinetic mechanisms for these fuels are tested with a published NO sub-mechanism incorporated into them. Simulations using both of these mechanisms demonstrate autoignition in the engine for all three pentanes, and that residual NO promotes autoignition, as found in previous studies. Differences between these two mechanisms and the engine experiments are nonetheless observed, and these differences are consistent with those observed in simulations of published rapid compression machine (RCM) data. Comparison of the RCM and the CFR engine modelling also suggests the need for high accuracy experiments and high-fidelity models due to the significant impact that small differences in autoignition timing can potentially produce in real engines.

本文介绍了对三种戊烷异构体（正，新和异戊烷）在标准ASTM爆震条件下运行的合作燃料研究（CFR）发动机中。首先测量这三种燃料的研究辛烷值（RONs），并将其与历史数据进行比较。然后使用具有详细化学动力学的两区模型模拟CFR发动机中戊烷/空气混合物的自燃。这些动力学模拟的初始条件和边界条件使用发动机模拟软件进行了系统校准。使用已发布的NO子机制将这些燃料的两种已发布的详细动力学机理进行了测试。使用这两种机制进行的仿真证明了所有三种戊烷在发动机中的自燃，并且残留的NO会促进自燃，如先前的研究中所发现的那样。尽管如此，仍观察到这两种机制与引擎实验之间的差异，并且这些差异与在已发布的快速压缩机（RCM）数据的模拟中观察到的一致。RCM和CFR发动机模型的比较还表明，由于自动点火正时的微小差异可能会在实际发动机中产生巨大影响，因此需要高精度实验和高保真模型。