王传毅，朱宏，肖进 

上海交通大学动力机械与工程教育部重点实验室

    摘要：应用大涡模拟方法对一台二冲程发动机缸内冷态湍流流场进行了三维瞬态数值分析。探索缸内流场的速度、压力及温度的变动情况，并与PIV流场测试结果进行了对比。三维模拟的缸压曲线与实验及一维模拟均吻合较好，但在速度概率密度函数方面与实验存在一定差异。模拟结果表明：本文建立的三维模型能够自然再现缸内冷态流动的随机大尺度涡流情况，模型可靠有效。模拟能够较好地反应火花塞位置附近速度随机波动情况，其结果对于后续研究缸内大尺度涡流对燃烧循环变动的影响机理具有一定的指导意义。

    关键词：二冲程，大涡模拟，大尺度涡流，STAR-CD

    Abstract: A large eddy simulation (LES) approach was used to study the in-cylinder turbulent flows of a two stoke engine. The variation of the in-cylinder flow characteristics was explored and compared with PIV measurement data. Computational results show that, LES simulation could reflect the pressure change and the transformation of turbulence and the model is effective; Diversities were found between simulation and experiment in aspect of the probability density function (pdf) of velocity; Velocity random fluctuations around the spark plug were well simulated and this is meaningful for the coming research on the effect large scale turbulence could make on the combustion.