SolidWorks190柴油机进气系统的流场建模及仿真

摘要对于小型柴油机来说，优化柴油机工作过程是改善柴油机性能的重要方法。在工作过程中，进气系统的好坏是决定燃烧过程优劣的重要因素之一。进气过程中的气体流动对燃油雾化、油气混合以及燃烧过程有非常重要的影响。本文以190柴油机为例，采用三维数值模拟方法，对气体在进排气道中稳态流动过程进行了模拟研究。53185

本文采用三维建模软件SolidWorks建立了进排气系统内流道三维实体模型，利用FIRE软件的网格划分工具FAME进行网格划分，建立了适用于计算的三维实体网格。再应用关于计算流体力学的FIRE软件对190柴油机的进排气过程在稳态条件下进行了三维数值模拟，得到流动气体的速度场、压力场以及温度场的分布情况，然后对这些参数进行相应的对比分析。

毕业论文关键词：进气系统、计算流体力学，稳态条件，190柴油机

Abstract For small diesel engine, optimization of diesel engine working process is an important method to improve the performance of the diesel engine. In the work process, the intake system is good or bad is an important factor affecting the combustion process quality. The influence of gas flow in the intake process is very important for the atomization of fuel, oil and gas mixing and combustion process. Taking the 190 diesel engine as an example, the three-dimensional numerical simulation method, the gas in the inlet and exhaust ports in the steady flow was simulated.

In this paper, the 3D flow in the exhaust system model with three-dimensional modeling software SolidWorks, mesh with mesh tool FAME of FIRE software, three-dimensional grid was established for calculation. Application of CFD software FIRE for 190 diesel engine intake and exhaust process under steady-state conditions is simulated, to obtain the flow gas velocity field, pressure field and temperature field distribution, and then analyzing these parameters corresponding contrast.

Keywords: Air intake system, CFD, The steady-state conditions, 190 Diesel engine

第一章绪论 1

1.1 概述 1

1.2 CFD的基本原理 2

1.3 CFD的应用发展 3

1.3.1 CFD在国外的应用发展 4

1.3.2 CFD在国内的应用发展 5

1.4 课题的内容及意义 5

第二章数值模型及流场三维建模 7

2.1 数值模拟方法的通用流程 7

2.2 气体流动数值模拟的理论基础 8

2.2.1 质量守恒方程 8

2.2.2 动量守恒方程 8

2.2.3 能量守恒方程 9

2.3 气体流动数值模拟的计算方法 9

2.4 流场的三维建模 10

第三章模型网格划分 12

3.1 网格划分简介 12

3.2 划分网格的方法 12

3.3 面网格 12

3.3.1 模型的准备 13

3.3.2 导入表面网格 13

3.4 线网格 13

3.4.1 生成线网格 SolidWorks190柴油机进气系统的流场建模及仿真:http://www.751com.cn/jixie/lunwen_57253.html