中文摘要：

引言 随着排放法规的日益严格和原油价格的不断上涨,柴油发动机正面临着同时降低排放和减少油耗的双重挑战。计算流体力学（CFD）模拟可以深入理解发动机缸内复杂的流动、喷雾和燃烧过程,是研发下一代清洁、高效柴油机的重要工具。

英文摘要：

The representative interactive flamelets（RIF）model was coupled with the large eddy simulation（LES）method to predict the turbulent combustion in a diesel engine.The new approach is specifically suitable for the simulation of the complicated combustion processes in internal combustion engines because the multi-scale and highly-transient turbulent motion can be well reproduced,and detailed chemical mechanism can be used.By combining the KIVALES-RIF code developed in previous work with a reduced n-heptane oxidation mechanism,the combustion processes and emission characteristics of a single-cylinder version of the Caterpillar 3400 series heavy-duty diesel engine was simulated under the baseline operating condition.The results indicated that the predicted ignition delay,in-cylinder pressure,heat release rate and pollutants emission levels were in good agreements with the experimental results.Comparison between the predictions of the Reynolds averaged Navier-Stokes（RANS）method and the LES method showed that the turbulence model played an extremely important role in the prediction of the combustion processes.