柴油机进气流动的数值模拟  

Numerical Simulation of Air Flow in Diesel Engine

作　　者：李云清[1] 张静[2] 李天蕾[1] 姜莉[3] 

机构地区：[1]北京航空航天大学汽车工程系,北京100083 [2]中国人民解放军防化研究院第五所,北京102205 [3]中国北方发动机研究所,山西大同037036

出　　处：《车用发动机》2005年第6期32-35,38,共5页Vehicle Engine

摘　　要：利用CFD软件对载重车用4气门6缸直喷水冷柴油机进气系统进行三维气体流动数值模拟计算,模拟结果给出了气道及气缸内三维流场的分布。从流场切面图可看出,切向气道和螺旋气道的气流之间存在着相互作用,这种作用有利于形成较大的进气湍流;在进气结束时,发现除了涡流以外还存在纵向的涡,在随后的压缩行程中,这些涡在高速转动的同时能量不断耗散,并将能量传递给周围流场,诱导出一个反方向的纵涡;最后给出了TKE(湍流动能)随曲轴转角的变化图。The three-dimensional flow field in a 6-cylinder 4-valve DI diesel engine intake system was numerically simulated using CFD software, and the 3D flow field was obtained. The simulated flow field showed that helical and tangent intake port had a disturbance each other, and there was a lengthways swirl when the air intake had finished. In the compressed stroke, the energy of swirl dissipated continually and gave the surrounding flow field, and induced a inverted lengthways swirl. The relation of the TKE（turbulence kinetic energy） with crank angle was understood.

关 键 词：柴油机 进气流动 数值模拟 

分 类 号：TK421.3[动力工程及工程热物理—动力机械及工程]