DME均质充量压燃着火过程的数值模拟研究  

Numerical Simulation for the Ignition Process of DME Homogeneous Charge Compression Ignition

作　　者：陈志[1] 黄震[1] 吕兴才[1] 罗马吉[1] 

机构地区：[1]上海交通大学内燃机研究所,上海200030

出　　处：《内燃机学报》2004年第1期1-6,共6页Transactions of Csice

基　　金：国家杰出青年科学基金资助项目(50025619);国家基础性研究重大项目(2001CB209208)。

摘　　要：以新型发动机代用燃料二甲醚(DME)为例,采用最新研究的DME化学动力学反应机理(DME氧化机理包括336个基元反应,涉及78种组分),利用美国SANDIA国家实验室开发的CHEMKIN Ⅲ软件,进行了DME均质充量压燃着火过程的数值模拟,并从理论上讨论分析了压缩比、进气温度、进气压力、燃空当量比、发动机转速对燃料着火时刻的影响。研究结果表明:DME的HCCI燃烧过程有明显的两阶段,压缩比、进气温度、进气压力、燃空当量比和发动机转速等参数的改变都会导致DME压燃着火过程的显著变化。In this work numerical scheme for the ignition process of DME Homogeneous Charge Compression Ignition was studied and the influences of some factors,including compression ratio,intake temperature,intake pressure,equivalence ratio and engine speed,were discussed by using the CHEMKIN-Ⅲ modeling packages which were developed by Sandia National Laboratory.The new kinetic mechanism for DME released by Lawrence National Laboratory consists of 78 species and 336 reactions.The results demonstrated that the ignition process revealed an obvious behavior of two stages and that the ignition timing was much sensitive to the changes of compression ratio,intake temperature,intake pressure,equivalence ratio and engine speed.

关 键 词：发动机 二甲醚 DME 均质充量压缩着火 数值模拟 化学动力学 燃空当量比 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]