（毕业设计论文）FLUENT空调硬座车厢内气流分布数值模拟.doc

PAGE 摘 要 随着我国铁路第六次提速，旅客对空调列车的舒适性提出了更高的要求。以往空调车内气流组织仅凭经验进行设计, 然后用实验改进的方法来调整送风口位置及尺寸, 既费时又耗费大量的实验费用[1]。在实用流体力学方面，采用通用的CFD（Computational Fluid Dynamics--CFD)商业软件完成工程上的一些流体力学问题，有极其广泛的应用前景。 本文采用流场分析软件FLUENT对空调硬座车厢内气流分布进行数值模拟，首先运用GAMBIT软件建立空调硬座车三位计算模型，定义边界类型，在FLUENT软件中选择计算方法，对计算结果进行后处理，获得车厢内速度场和温度场的直接信息，对原始空调设计方案进行评估。其次，对改变模型的网格数，分别取网格大小60mm、70mm、80mm，通过计算机模拟计算，得出网格大小取60mm时较合理；改变空调进风口的位置，对风口位置距车厢中心线425mm和525mm对称分布的方案进行分析对比。从而得出取通风口位置距车厢中心线425mm对称分布、网格大小为60、网格数量为92万，是比较优越的空调通风进风口方案。 本文工作对空调硬座车空调方案的设计提供了有力的技术支持。 关键词：空调系统 载人列车 CFD 数值模拟 气流分布 ABSTRACT With the speed of the sixth time passenger train comfort air conditioning put forward higher request. But the current air conditioning air quality and the passenger train expectations still have a margin, main performance in key parts air age is longer, the influence of the passenger comfort. In the air before air distribution with only experience with experimental design, then the improvement method to adjust air ports position and size, was slow and spend a lot of experiment expenses. In practical Fluid mechanics, the general Dynamics (CFD Computational Fluid-CFD) commercial software completed on some of the Fluid mechanics problems, have extremely broad prospect of application. In this article, the flow field analysis software FULENT to air conditioning hard seat air distribution in carriage, a numerical simulation software is built the first use of GAMBIT air conditioning hard seat three calculation model car, definition, types in FLUENT software border select calculation method, the results calculated post-processing, get the compartment velocity field and temperature field of information, the original direct air conditioning design scheme for the evaluation. Next to change the model number of the grid, were taken 60 mm, meshing size 70 mm and 80 mm, through the computer simulation results show that the grid size take 60 mm in a reasonable; Change the position of the air conditioning wind path, draught position ab