汽油与乙醇均质压燃燃烧和排放特性的对比仿真

汽油与乙醇均质压燃燃烧和排放特性的对比仿真(论文10000字)
摘要
改革开放以来，我国的汽车工业迅猛发展，越来越多的人出行选择汽车，但因汽车而造成的环境问题却一直困扰着人们。汽车尾气是大气污染物主要来源之一，为了有效降低发动机燃烧所产生NOx、碳烟等有害物质，人们发现了HCCI燃烧技术；HCCI燃烧技术作为最前沿的内燃机燃烧技术，越来越受到广大科研人员的重视，也是因为此，为了更好地实现HCCI燃烧，人们通过建立零维模型和准维模型来模拟燃烧室内燃烧情况，以便更好的控制进气条件、转速、压缩比等因素对其燃烧和排放的影响。本文通过建立单区和多区模型，将详细分析各种工况下，内燃机的燃烧情况，从而得出结论；另外本文也对乙醇和汽油作为发动机燃料时其燃烧和排放进行了对比，分析了其对做功、着火时刻、CO氧化发生的时刻的影响，得出结论。
关键字：均质压燃  乙醇  汽油   数值模拟

Simulation Comparison of Characteristics of HCCI Combustion and Emissions with Gasoline and Ethanol
ABSTRACT
Since the reform and opening up, China's automobile industry has developed rapidly. More and more people choose to travel by car. However, the environmental problems caused by automobiles have always plagued people. Automobile exhaust is one of the major sources of atmospheric pollutants. In order to effectively reduce the NOx, soot, and other harmful substances generated by engine combustion, people have discovered the homogeneous charge compression ignition combustion technology; HCCI combustion technology, as the most advanced combustion technology of internal combustion engines, is widely studied. And therefore, in order to better achieve the HCCI combustion, people establish a zero-dimensional model and a quasi-dimensional model to simulate combustion in the combustion chamber, in order to better study the influence of factors such as intake conditions, speed, compression ratio, etc on combustion and emissions. In this paper, the single-zone and multi-zone models are established to analyze the combustion in the internal combustion engine under various operating conditions in detail and to reach conclusions. In addition, this article also compares the combustion and emissions with ethanol and gasoline as engine fuels. Its effects on the work, the ignition timing, and the moment of CO oxidation are studied, and conclusions are reached.
Key words: homogeneous charge compression ignition; ethanol; gasoline; numerical simulation

目录
摘要    I
ABSTRACT    II
第一章 绪论    1
1.1引言    1
1.2汽油机的均质压燃(HCCI)低温燃烧技术    1
1.3 HCCI燃烧特点及其面临的挑战    2
1.4本课题研究的意义和内容    3
1.5经济性分析    3
第二章 HCCI发动机燃烧模拟研究    4
2.1CHEMKIN软件介绍    4
2.2 零维模型建立    5
2.2.1零维模型简介    5
2.2.2零维模型建立的一般流程    5
2.3准维模型建立    8
2.3.1准维模型简介    8
2.3.2准维模型建立的一般流程    9
第三章  化学动力学模型在HCCI发动机燃烧研究的应用    11
3.1 HCCI发动机燃烧的单区模型模拟    11
3.1.1计算模型    11
3.1.2进气初始条件对以乙醇为燃料的HCCI发动机燃烧和排放的影响    12
3.1.3转速和压缩比对以乙醇为燃料的HCCI发动机燃烧和排放的影响    14
3.1.4进气初始条件对以汽油为燃料的HCCI发动机燃烧和排放的影响    16
3.1.5转速和压缩比对以汽油为燃料的HCCI发动机燃烧和排放的影响    20
3.2 HCCI发动机燃烧的多区模型模拟    22
3.2.1模型标定    23
3.2.2乙醇多区模型计算结果分析    24
3.2.3汽油多区模型计算结果分析    25
3.3本章小结    26
第四章 乙醇和汽油HCCI燃烧对比    27
4.1进气条件的影响    27
4.2当量比的影响    28
4.3转速和压缩比的影响    28
4.4本章小结    29
第五章 全文总结与工作展望    30
5.1全文总结    30
5.2工作展望    30
参考文献    32
致 谢    34