摘要随着科技的飞速发展，射流越发广泛地应用于工程技术领域中，如航空航天、能源化工、水利工程和环境保护等。大多数射流在运动中既受重力的作用,又受射流与温度差(或环境流体密度差)引起的浮力作用,此类流动即浮力射流。论文建立浮力射流与液体相互作用的非稳态过程的理论模型，利用FLUENT软件对浮力射流膨胀过程进行数值模拟，从几何模型建立、网格划分、模型计算设置等方面具体阐述了求解过程, 探讨了渐扩型结构尺寸、喷孔直径以及喷射气压等参数变化对射流扩展形态的影响，获得射流流场中压力、速度以及温度等参数的变化规律。20893
关键词  浮力射流  Fluent软件  数值模拟  流场变化规律
 毕业论文设计论文外文摘要
Title     Numerical Simulation of Round Vertical Buoyant   
          Jet Based on Software Fluent                                
Abstract
With the rapid development of technology, the jet has been widely applied in the field of engineering technology, such as aerospace, energy and chemical industry, water conservancy and environmental protection etc.. Most jet is not only influenced by gravity in motion, but also by buoyancy effects caused by the jet and the temperature difference (or environmental fluid density difference), those are buoyant jet. The thesis developed
the theoretical model of the unsteady process of interaction between buoyant jet and liquid ,and made numerical simulation about the expansion of the buoyant jet by Fluent software. The solving process included geometry modeling, meshing and setting etc.. The influence of chamber structure、nozzle hole diameter and jet pressure to jet shape has been approached. The change law of parameter, such as pressure，velocity and temperature, in the flow field has been obtained.
Keywords  Buoyant jet  Fluent software  Numerical simulation  Change law of the flow field
目  次

1    引言    1
1.1    概述    1
1.2    国内外浮力射流研究现状    2
1.3    本文研究内容    3
2    Fluent软件简介    4
2.1    Fluent的主要特点    4
2.2    Fluent的前置模块    4
2.3    基本分析过程    5
3    模型建立    6
3.1    物理模型    6
3.2    几何模型    6
3.3    边界条件    7
3.4    数学模型    8
4    数值模拟    11
4.1    计算网格    11
4.2    计算模型    11
4.3    渐扩结构数值模拟    13
5    矩形结构数值模拟    20
5.1    压力分布    20
5.2    速度分布    21
5.3    温度分布    22
6    多参数变化对射流扩展过程的影响    23
6.1    渐扩型结构尺寸对射流扩展过程的影响    23
6.2    喷孔直径对射流扩展过程的影响    26
6.3    喷射气压对射流扩展过程的影响    28 基于FLUENT的圆形垂直浮力射流的数值模拟:http://www.youerw.com/wuli/lunwen_12842.html