【2017年整理】论文格式.docVIP

四川理工学院毕业设计（论文）PAGE 摘 要 三号黑体三号黑体加粗 居中，字间空一字符，后空一行均质充量压缩着火（HCCI）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（DME）为例，对HCCI发动机燃用DME的着火和燃烧过程进行了研究。结果表明，DME的HCCI燃烧过程有明显的低温反应放热和高温反应放热两阶段；增大压缩比、燃空当量比、提高进气充量温度、添加H2O2、H2、CO使着火提前；提高发动机转速、采用冷却EGR、添加CH4、CH3OH使着火滞后。（内容为小四号宋体）空一行空一行关键词：均质充量压缩着火；化学动力学；数值模拟；燃料添加剂小四号黑体关键词为3~5个，小四号宋体，分号小四号黑体关键词为3~5个，小四号宋体，分号分开，最后一个关键字后面无标点符号三号字加粗， Times New Roman,上下各空一行ABSTRACT三号字加粗， Times New Roman,上下各空一行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. In this work numerical scheme for the ignition and combustion process of DME homogeneous charge compression ignition is studied. The results show that the HCCI combustion fueled with DME consists of a low temperature reaction heat release period and a high temperature reaction heat release period. It is also founded that increasing the compression ration, the equivalence ratio, the intake charge temperature and the content of H2O2, H2 or CO cause advanced ignition timing. Increasing the engine speed, adoption of cold EGR and the content of CH4 or CH3OH will delay the ignition timing.Key words: HCCI; chemical kinetics; numerical simulation; fuel additive小四号Times New Roman，各关键词之间小四号Times New Roman，各关键词之间分号分开，分号后加一空格，关键词为3~5个小四号Times New Roman加黑,key words之间加一空格 小四号宋体, 行间距设置为小四号宋体, 行间距设置为22磅三号黑体加粗，居中，两字之间空两个字符，上下各空一行 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc230452382 HYPERLINK \l _Toc230452383 1 前 言 PAGEREF _Toc230452383 \h 1 HYPERLINK \l _Toc230452384 2 DME均质充量压燃着火的数值模拟方法 PAGEREF _Toc230452384 \h 1 HYPERLINK \l _Toc230452385 2.1 二级标题 PAGEREF _Toc230452385 \h 1 HYPERLINK \l _Toc230452386 2.1.1 三级标题 PAGEREF _Toc230452386 \h 1……………………………………………………………………………………………………………………………