内部EGR对柴油机HCCI高负荷拓展因素的影响  

Effects of Internal EGR on High-load Development Factors of Diesel HCCI Combustion

作　　者：王英豪[1] 李人宪[1] 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《机械工程与自动化》2015年第1期19-20,23,共3页Mechanical Engineering & Automation

摘　　要：为了研究内部废气再循环(EGR)率对柴油机HCCI高负荷拓展因素的影响,以某型柴油机为例,在不同内部EGR率情况下,采用计算流体力学(CFD)方法对柴油机HCCI燃烧过程进行了仿真计算。结果表明:随着EGR的增大,缸内平均燃烧温度降低;燃空当量比逐渐降低;燃烧持续期先缩短后延长,在EGR率为35%时燃烧持续期最短;缸内最大压力升高率降低;柴油机IMEP(平均指示压力)先增大后降低,在EGR率为35%左右时达到最大,为0.573 MPa。In order to investigate the effects of internal EGR on the high load development factors of HCCI combustion,based on the simulation of CFD method,the working process of a single-cylinder HCCI test engine was simulated.The calculation result indicates that：With the increase of internal EGR,the in-cylinder average temperature decreases and the equivalence ratio decreases;The combustion duration initially decreases and then increases with the minimum rate when the rate of internl EGR is 35%;The in-cylinder maximum rate of pressure rise decreases;The IMEP appears in the trend of firstly increases then decreases,and it reaches the maximum rate（0.573 MPa）when the rate of internl EGR is 35%.

关 键 词：均质压燃模式 内部EGR 仿真分析 负荷 燃烧过程 柴油机 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术] TK42[自动化与计算机技术—计算机科学与技术]