基于米勒循环的柴油机缸内燃烧CFD仿真分析  

CFD Simulation Analysis of Diesel Engine Combustion Based on Miller Cycle

作　　者：胡益 倪计民[1] 石秀勇[1] 管志云[1] HU Yi;NI Jimin;SHI Xiuyong;GUAN Zhiyun(School of Automotive Studies,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学汽车学院,上海201804

出　　处：《车用发动机》2020年第6期31-37,共7页Vehicle Engine

摘　　要：在ProE中建立某发动机气缸与进排气管道三维模型,使用Boost软件确定燃烧模型的初始压力和温度。通过Converge软件导入发动机气缸与进排气管道三维模型以及初始条件,并建立燃烧模型,计算M0(正常进气,米勒度为0)与M-50(米勒循环,米勒度为-50)的燃烧情况,分析米勒循环对缸内流动和燃烧的影响。通过对发动机在1000 r/min工况下流场的比较发现,压缩过程中M0更利于均匀混合气的形成,燃烧前期M-50更利于均匀混合气的形成。通过对湍动能的分析可知,湍动能较高的区域与喷雾区域相同,燃烧期间的湍动能主要受到油束扩散的影响。A three-dimensional model of engine cylinder and intake and exhaust pipes was established with ProE software and the initial pressure and temperature of combustion model were determined with Boost software.Then a combustion model was established by importing the built model and initial conditions into the Converge software.The combustion states of M0(normal intake air,0 Miller degree)and M-50(Miller cycle,-50 Miller degree)were calculated and the influences of Miller cycle on the flow and combustion inside cylinder were further analyzed.Through the comparison of flow field,it was found that the formation of uniform mixture became easier for M0 during the compression process and for M-50 in the early stage of combustion at 1000 r/min.According to the analysis of turbulent kinetic energy,the region of high turbulent kinetic energy was the same as the spray region.The turbulent kinetic energy during combustion was mainly affected by the fuel beam diffusion.

关 键 词：米勒循环 柴油机 缸内流动 燃烧 仿真 湍动能 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]