火花点火发动机着火延迟期、燃烧持续期及NO_x排放的数值模拟预测

Numerical Simulation Predication for Ignition Delay, Combustion Duration and NO_x Emissions of SI Engines

本文介绍了火花点火发动机着火延迟期、燃烧持续期及ＮＯｘ排放的数值计算方法，并结全准维湍流卷吸模型进行了数值计算。文中给出了准维模型的计算与试验结果，并分析计算了若干发动机运行参数对着火延迟期、燃烧持续期及ＮＯｘ排放和平均指示压力的影响。结果表明，根据准维模型建立的着火延迟期、燃烧持续期及ＮＯｘ排放计算式有较清晰的物理意义，对分析、理解火花点火发动机燃烧与排放形成有一定的参考价值。

A numerical simulation method for ignition delay, combustion duration and NOx emissions of spark-ignition engines is developed, and the numerical calculation is carried out with the quasi-dimensional turbulent entrainment model. The calculation and test results are given in this paper.The effects of several engine running parameters on the ignition delay, combustion duretion,NOxemissions and mean indicate pressure are considered. The results show that this numerical method can provide more useful information for the combustion and emissions of spark-ignition engines.