Simulations are presented for the engine combustion network (ECN) n-dodecane spray A using the sparse-Lagrangian multiple mapping conditioning model for the reactive scalar field coupled with a large eddy simulation for the flow (MMC-LES). This is the first application of the MMC-LES to both transient and engine conditions and, in line with earlier simulations of the ECN flames, the fuel injection is modelled as a gas-jet. The model is evaluated initially for a baseline non-reacting case with ambient temperature of 900 K. Results for vapour penetration lengths and the radial profiles of mixture fraction show good agreement with experiments. The model is then applied to reacting cases, featuring transient ignition and combustion with a lifted flame base. A 106-species chemistry mechanism is employed. Simulations are performed at various ambient temperatures (800–1100 K) and various volume fractions of ambient oxygen (13–21%) that correspond to conditions in both conventional and advanced diesel engines. The trend towards decreasing ignition delay time and lift-off length with increasing ambient temperature and oxygen is predicted well. The quantitative agreement between the computed and experimental ignition delay times is satisfactory. The accuracy of lift-off length predictions is less accurate but comparable to the existing literature. Better results are obtained at the conditions with lower ambient temperatures and oxygen concentrations. This outcome is explored with a detailed analysis of heat release and scalar dissipation rates under various ambient temperature conditions. It is revealed that at high ambient temperatures, flame stabilisation occurs in a region with significant turbulence–chemistry interactions and close to the nozzle exit where the liquid phase would be expected to influence the flame.

模拟是为了在发动机燃烧网络（ECN）ñ-十二烷喷雾A使用针对反应性标量场的稀疏拉格朗日多重映射条件模型，以及对流动的大涡流模拟（MMC-LES）。这是MMC-LES在瞬态和发动机条件下的首次应用，并且与早期的ECN火焰模拟相一致，燃料喷射被建模为喷气。最初在环境温度为900 K的情况下针对基线不反应的情况对模型进行了评估。蒸汽渗透长度和混合物馏分径向分布的结果与实验吻合良好。然后将该模型应用于反应室，其特征是具有短暂的点火和燃烧，并带有抬升的火焰底座。采用了106种化学机制。在各种环境温度（800–1100 K）和环境氧气的各种体积分数（13–21％）下进行模拟，这些条件对应于常规柴油机和高级柴油机的条件。可以很好地预测随着环境温度和氧气的增加，点火延迟时间和升程时间缩短的趋势。计算的和实验的点火延迟时间之间的定量一致性是令人满意的。提离长度预测的准确性较差，但可与现有文献相提并论。在较低的环境温度和氧气浓度的条件下可获得更好的结果。通过详细分析各种环境温度条件下的散热和标量耗散率来探索这一结果。据揭示，在较高的环境温度下，