优秀论文中英文摘要模板.docx

优秀论文中英文摘要模板 *届本科生优秀毕业设计摘要 二甲醚清洁燃料均质压燃燃烧数值模拟研究 机械与动力工程学院 学号 姓名 指导教师: 姓名 摘 要 均质充量压缩着火燃烧，作为一种能有效实现高效低污染的燃烧方式，能够使发动机同时保持较高的燃油经济性和动力性能，而且能有效降低发动机的NOx和碳烟排放。此外HCCI燃烧的一个显著特点是燃料的着火时刻和燃烧过程主要受化学动力学控制，基于这个特点，发动机结构参数和工况的改变将显著地影响着HCCI发动机的着火和燃烧过程。本文以新型发动机代用燃料二甲醚为例，对HCCI发动机燃用DME的着火和燃烧过程进行了研究。 关键词：均质充量压缩着火，化学动力学，数值模拟，二甲醚，EGR，燃料添加剂 NUMERICAL SIMULATION OF HOMOGENEOUS CHARGE COMPRESSION IGNITION COMBUSTION FUELED WITH DIMETHYL ETHER ABSTRACT HCCI (Homogenous Charge Compression Ignition) combustion has advantages in terms of efficiency and reduced emission. HCCI combustion can not only ensure both the high economic and dynamic quality of the engine, but also efficiently reduce the NOx and smoke emission. Moreover, one of the remarkable characteristics of HCCI combustion is that the ignition and combustion process are controlled by the chemical kinetics, so the HCCI ignition time can vary significantly with the changes of engine configuration parameters and operating conditions. In this work numerical scheme for the ignition and combustion process of DME homogeneous charge compression ignition is studied. The detailed reaction mechanism of DME proposed by American Lawrence Livermore National Laboratory (LLNL) and the HCT chemical kinetics code developed by LLNL are used to investigate the ignition and combustion processes of an HCCI engine fueled with DME. Key words: HCCI, chemical kinetics, numerical simulation, DME, EGR, fuel additive 1