中文摘要：

建立了耦合详细化学反应动力学的多维CFD模型,并基于MPI（message passing interface）建立了发动机并行模拟计算平台,以此为基础,开展了煤层气发动机多维仿真模拟工作.研究了缸内组分瞬态分布规律和过量空气系数、氮气体积分数对煤层气发动机缸内燃烧性能的影响.结果表明,发动机缸内中间组分分布具有良好的规律性.随着过量空气系数、氮气体积分数的增加,发动机动力性能变差,燃烧期增加,同一曲轴转角下NO生成量明显下降.同时,采用并行计算后,单循环的计算时间相对于串行程序大大降低.

英文摘要：

Multi-dimensional simulation codes for SI engine coupled with detail reaction kinetics are achieved.In order to reduce consuming time,the function of parallel computing is developed for the CFD software based on message passing interface（MPI）.The instantaneous distribution of intermediate components and the effect of air excess ratio and nitrogen volume fraction on engine performance have been studied.The results show that intermediate components have clear distribution regularity in cylinder.With the increase of air excess ratio and nitrogen volume fraction,engine power decreases and combustion duration increases.At the same crank angle,NO generation rate decreases remarkably.Based on parallel computing technology,the consuming time for each cycle calculation gets much shorter than that when sequential computing technology is adopted.