HCCI发动机燃烧多维数值模拟(Ⅱ)——运行工况向高负荷扩展方法的探讨  

Numerical Simulation of Combustion in HCCI Engine Using Multi-Dimensional Model(Ⅱ)——A discussion on expanding to higher loads with several different methods

作　　者：贾明[1] 解茂昭[1] 

机构地区：[1]大连理工大学动力工程系,辽宁大连116024

出　　处：《内燃机学报》2007年第1期9-15,共7页Transactions of Csice

基　　金：国家基础研究重点规划项目子课题(2001CB209201)

摘　　要：使用多维详细动力学模型模拟了以异辛烷为燃料的均质压燃(HCCI)发动机的燃烧过程。通过结合多维CFD程序KIVA和详细反应动力学程序CHEMKIN实现了化学反应与流动的耦合运算。计算比较了通过降低初始温度延迟着火点,降低缸壁温度和加大涡流比增强缸内的热分层,以及加入EGR率4种不同的方法来降低声响强度,以避免敲缸的发生,实现向高负荷扩展的目的。结果发现通过适当的着火延迟可以有效地降低声响强度,同时保证性能和排放基本不变。在这4种方法中,加大进气涡流比对降低声响强度的效果最为显著,而使用EGR在综合性能方面表现最佳。Detailed chemical kinetics model was used in a CFD code to study the combustion process of Homogeneous charge compression ignition （HCCI） Engine fueled with iso-octane. The detailed chemical kinetics code CHEMKIN was implemented into the Multidimensional CFD code KIVA-3V so that the chemical reaction and flow were coupled. The benefits and limits of expanding to higher load with retarded burning point by decreasing intake temperature, enhancing thermal stratification by lowing cylinder wall temperature and increasing swirl ratio, and increasing EGR ratio were analyzed. The results indicate that proper combustion phase retarding can reduce acoustic intensity significantly and maintain the performance and emissions. Among these four methods, increasing swirl ratio could effectively reduce the acoustic intensity, while EGR shows the comprehensive merits in controlling HCCI combustion.

关 键 词：均质压燃(HCCI)发动机 数值模型 多维模型 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]