基于MATLAB的发动机热力学建模与仿真+源代码
关键词 发动机 MATLAB 热力学模型 微分方程
毕业论文设计说明书外文摘要
Title Modeling and simulation of thermodynamics of engine based on MATLAB
Abstract
Based on the zero-dimension hypothesis, a rapid calculation program of thermodynamic model of spark-ignition four-stroke cylinder gasoline engine was written. Final equation were derivated by equations of conservation of mass, energy and the laws of thermodynamic and it was soluted according to the cylinder’s working process with different characteristics. MATLAB program was applied to study the simulation of engine, the changing of main parameters in the cylinder in whole cycle was obtained. This paper focuses on the effection of inlet pressure, ignition time and compression ratio on engine p-v diagrams and thermal efficiency and Engine p-v diagrams and thermal efficiency of different inlet pressure, Ignition time and compression ratio are obtained. The simulation results were compared with experimental results and found it matches the practical results well. The result of the numerical simulation provides the reliable theory basis for the design and improvement of engine. It can guide the development of new engines and enhance the performance of old engine. As a result, you can reduce the experimental expenses and time and also save the massive manpower as well as physical resources．
Keywords Engine MATLAB Thermodynamic model Differential equatios
目 次
1 绪论 3
1.1 文献综述 3
1.1.1 发动机进行计算机仿真技术的背景与意义 3
1.1.2 国内外研究状况 4
1.1.3 常用发动机仿真软件介绍 5
1.2 本课题要研究或解决的问题和拟采用的研究手段（途径） 6
1.2.1 本课题要研究或解决的问题 6
1.2.2 拟采用的研究手段（途径）： 6
2 数学仿真模型的建立 8
2.1 本文的技术路线 8
2.2 热力学过程的数学模型 8
2.2.1 建模过程基本假设 8
2.2.2 建模过程微分方程 8
2.2.3 发动机缸内热力过程分析 9
2.3 活塞往复运动的数学模型 13
2.4 燃烧放热过程的数学模型 14
3 仿真程序设计与编程 18
3.1 MATLAB软件介绍 18