摘要
利用KIVA 3V程序对F91 2Q风冷、直喷柴油机进行了仿真研究 .仿真计算采用三维网络结构 ,计算区域包括进气道、进气阀、气缸、排气阀、排气道 .仿真计算得到的缸内压力 时间曲线和排气污染物各成份分别与试验数据进行了对比 ,结果表明仿真计算可以较好地再现实际的发动机工作过程 .在此基础上 ,利用KIVA 3V程序研究了涡流强度以及喷雾锥角对燃油喷射、蒸发和油气混合过程的影响 .仿真结果表明 :通过适当加大涡流比可以显著促进燃油蒸发和油气混合过程 ;喷雾锥角对发动机蒸发和燃烧过程有显著的影响 。
A computational fluid dynamics (CFD) study was carried out on a four stroke air cooled DI diesel engine, F912Q manufactured by Beinei Company, by using the KIVA 3V code. A three dimensional mesh was set up to model the cylinder, intake passage and exhaust passage. The calculated in cylinder pressure history and emissions are compared with the engine test data. The results show reasonable agreement. The effects of swirl ratio and spray angle on fuel spray, evaporation and mixing are investigated. It is found that there are optimum swirl ratio and spray angle for better evaporation and combustion.
