西南科技大学毕业论文(模板) - 副本 - 副本
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
毕业论文开题报告
论文题目:
教学单位:专业:年级: 学生姓名:指导教师姓名:
任务书
题目名称
题目性质□真实题目□虚拟题目学生学号指导教师
学生姓名
专业名称技术职称
学生层次学习中心名称:
年月日
毕业设计(论文)内容与要求:
毕业设计领导小组负责人:(签字)
年月日
学生姓名:学生班级:总分:
学生姓名:学生班级: 总分:
毕业设计(论文)答辩成绩表(30%)
学生姓名:学生班级:总分:
内容设计(论文)内容
(10%) 回答问题
(10%)
设计(论文)质
量(10%)
考核
环节内容充实、有足够的难
度和工作量,在规定的
时间内能够流畅地阐
明报告设计(论文)内
容
能够回答与设
计(论文)相关
的基本问题和
扩展问题
论文有数据,
有分析,所用
数据可靠、分
析正确
分值10 10 10 评分
学号:分类号: 密级:公开教学单位:
西南科技大学
毕业论文
题目:的思考
学生姓名
培养单位西南科技大学成人教育学院
指导教师职称
专业名称
毕业日期年月日5号宋体,行距1.5倍,5号宋体,下空二行
(小二标宋,
行距1.5倍)
(小二号黑体,
上下各空一行)
(小三号宋体,
下空四行)
(四号宋体,
行距40磅)
二甲醚清洁燃料均质压燃燃烧数值模拟研究
【摘要
【关键字】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
四号黑体
摘要正文小四号宋体,首行缩进二个字,字数300-500字,1.5倍行距。四号黑体
小四号宋体最后一个
关键字后面无标点符
号。
毕业设计(论文)中英文摘要
空一行摘要前需有论文题目,三号黑体居中,上下各空一行。
空一行毕业设计(论文)题目,黑体小五号字。
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 NO x 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. The new kinetic mechanism for DME consists of 79 species and 399 reactions. To consider the effect of wall heat transfer , a wall heat transfer model is added into the HCT code 。 By this method, the effects of the compression ratio, the fuel-air equivalence ratio, the intake charge heating , the engine speed , EGR and fuel additive on the HCCI ignition and combustion are 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 H 2O 2, H 2 or CO cause advanced ignition timing 。 Increasing the engine speed, adoption of cold EGR and the content of CH 4 or CH 3OH will delay the ignition timing.
Key words: HCCI, chemical kinetics , numerical simulation, DME , EGR , fuel additive
三号Times New Roman 居中加黑,一律用大写字母,上下各空一行。
四号Times New Roman 居中加黑
五号Times New Roman, 首行缩进,单倍行距。
空一行
小四号Times New Roman 加黑,key 五号Times New Roman ,各关
键词之间无标点,其间加一空格。