摘 要

内燃机作为一种优良的动力机械，从诞生之日起就得到了不断的创新和改进。今天，内燃机技术有了很大的进步。目前，内燃机以其热效率高、功率范围宽等优点被广泛应用于各个领域，其功率、可靠性和经济性也越来越稳定。

但不可避免的是，内燃机不仅给人类带来了便利，也给人类赖以生存的自然环境带来了严重而不可逆转的破坏。此外。内燃机的广泛应用使能耗达到了很高的水平。为了应对全球石油储量逐年减少和能源危机日益加剧的局面，开发内燃机代用燃料已成为当务之急，轻烃是一种很好的代用燃料。轻烃作为内燃机的燃料，刚刚进入起步阶段，因此对轻烃/柴油双燃料发动机的仿真研究具有十分重要的现实意义。

本文以6135柴油机作为研究对象，利用MATLAB软件，通过已知的示功图获得了相应的燃烧放热规律，利用巴特沃斯滤波器将燃烧放热率曲线光顺处理后，再对放热率曲线进行处理并获得了燃烧始点和燃烧持续时间等参数，然后利用双韦伯曲线和最小二乘法的相关原理拟合求得了各个工况点的预混燃烧和扩散燃烧两个阶段的形状参数。再利用这些参数通过AVL BOOST软件建立发动机模型，最终获得了各个工况点相应的示功图，通过对比发现示功图的误差在接受范围内，最后得出结论：在本文研究的四个工况点，燃烧始角和扩散燃烧阶段的形状参数的值对最终压力的仿真值的影响比较大，且扩散燃烧阶段的形状参数基本稳定在1左右；扩散燃烧阶段的形状参数稍有波动，但对最终结果的影响不大。

关键词：双燃料发动机；燃烧放热率；MATLAB；AVL BOOST；仿真计算Abstract

As a kind of good power machinery, the internal combustion engine has been innovated and improved since its birth. Up to now, the technology of internal combustion engine has been improved a lot. Nowadays, the internal combustion engine is widely used in various fields because of its high thermal efficiency and wide power range, and its power, reliability and economy are also more and more stable.

But inevitably, the internal combustion engine not only brings convenience to human, but also brings serious and irreversible damage to the natural environment on which human lives. In addition. The widespread use of internal combustion engine makes the energy consumption reach a very high level. In order to deal with the global oil reserves decreasing year by year and the energy crisis aggravating day by day, the development of alternative fuel for internal combustion engine has become an urgent task, and light hydrocarbon is a good alternative fuel. As the fuel of internal combustion engine, light hydrocarbon has just entered the initial stage, so the simulation of light hydrocarbon / diesel dual fuel engine has very important practical significance.

In this paper, 6135 diesel engine is taken as the research object, MATLAB software is used to obtain the corresponding law of combustion heat release through the known indicator diagram. After the curve of combustion heat release rate is faired by Butterworth filter, the curve of heat release rate is processed and the parameters such as combustion start point and combustion duration are obtained. Then, the premixing of each operating point is obtained by using the correlation principle of double Weber curve and least square method The shape parameters of combustion and diffusion combustion. Use these parameters to pass AVL The engine model is built by boost software, and the corresponding indicator diagram of each operating point is obtained finally. Through comparison, the error of indicator diagram is found to be within the acceptable range. Finally, the conclusion is drawn: in the four operating points studied in this paper, the value of combustion start angle and shape parameter of diffusion combustion stage has a great influence on the simulation value of final pressure, and the shape parameter of diffusion combustion stage is basically stable The shape parameters of diffusion combustion stage fluctuate slightly, but have little influence on the final results.

Key Words: dual fuel engine; combustion heat release rate; MATLAB; AVL BOOST; simulation calculation

目 录

第一章 绪论 1

1.1 研究背景及意义 1

1.2 国内外研究综述 1

1.2.1 国内研究综述 1

1.2.2 国外研究综述 3

1.3 研究思路和主要研究内容 5

1.3.1 研究思路 5

1.3.2 主要研究内容 5

第二章 MATLAB发动机模型的相关计算 6

2.1 MATLAB软件介绍 6

2.2 燃烧放热率的计算 6

2.3 光顺处理 9

2.4 形状参数的计算 11

2.4.1 燃烧始角与燃烧持续时间的计算 11

2.4.2 最小二乘法拟合 14

第三章 AVL BOOST发动机模型的相关计算 19

3.1 AVL BOOST软件介绍 19

3.2 计算压力曲线 20

第四章 结果与讨论 25

参考文献 26

致谢 28

第一章 绪论

1.1 研究背景及意义

内燃机作为一种优良的动力机械，从诞生之日起就得到了不断的创新和改进。今天，内燃机技术有了很大的进步。如今，内燃机具有热效率高、功率范围宽的特点，其功率、可靠性和经济性也越来越稳定，因此内燃机在各个领域得到了广泛的应用，其在人们日常生活中的作用越来越重要。总的来说，内燃机的发展极大地促进了人类社会的进步

但不可避免的是，内燃机不仅给人类带来了便利，也给人类赖以生存的自然环境带来了严重而不可逆转的破坏。此外。内燃机的广泛应用使其能耗达到了很高的水平。从技术水平上看，我国内燃机技术与世界先进水平还有很大差距，特别是关键核心技术还比较落后。

当今世界，环境污染和能源危机已成为威胁人类生存和发展的关键问题。石油作为一种战略资源，甚至可以直接影响世界政治经济形势。改革开放以来，我国国民经济取得了快速发展，但与此同时，我国对石油的需求也在不断增加。

内燃机的广泛应用也带来了严重的环境污染。内燃机燃烧排放的一氧化碳（CO）、氮氧化物（NOx）、碳氢化合物（HC）和固体颗粒物（PM）是大气污染的主要来源。