论文总字数：23095字

摘 要

随着时代的飞速发展，空气冷却器作为一种可以有效降低冷却塔热端水温并减少空气带水量的冷却设备而备受人们的重视。当前，许多电力、化工、制冷行业里90%以上冷却负荷由空冷器承担。传热强化方面研究发展，也使空冷器的结构形式变得多样化，翅片管式换热器就是其中一种带翅的高效管式换热器。

在数值模拟中，本文先建立一个基本模型，分别就不同翅片间距、翅片厚度、翅片宽度、空气速度等四个因素对翅片管换热器的传热系数、范宁摩擦系数、传热热阻这三个流动及传热特性参数的影响进行数值模拟分析。计算结束后，本文先以基本模型为例对其温度场、速度矢量场、速度标量场以及压力场进行定性分析以了解整个翅片管式换热器的传热状况，从图中可以直观的看出换热强烈和换热薄弱以及流动剧烈和流动平稳的区域。然后文中将后处理的 Re 数、Nu 数、传热系数 h、范宁摩擦系数 f 、传热热阻 R 等数据与变量参数（翅片间距 S、翅片厚度δ 、翅片宽度 a）整理成折线图的形式，以定性分析各因素的具体影响趋势。

经过模拟研究，风速越大，传热效果越好，翅片宽度在一定范围内，越宽传热效果越好，翅片间距在一定范围内，越密传热效果越好。

关键词：矩型翅片管 数值模拟 传热特性 流动特性

Heat transfer and flow analysis of a single

Rectangular finned tubes

Abstract

With the rapid development of the times, an air cooler can effectively reduce the hot end of the cooling tower water and reduce air with water cooling equipment and much attention. Currently, many electric power, chemicals, refrigeration industry where over 90% of the cooling load borne by the air cooler. Heat transfer enhancement aspects of research and development, but also to form the structure of the air cooler becomes diversified, finned-tube heat exchanger is one of the winged efficient tube heat exchangers.

In the numerical simulation, this paper first create a basic model, four factors were on different fin spacing, fin thickness, fin width, the air speed of the finned tube heat exchanger heat transfer coefficient, Fanning friction coefficient, Numerical simulation of the impact analysis of thermal resistance flow and heat transfer characteristics of these three parameters is. After the calculation, the paper first with the basic model as an example of qualitative analysis of its temperature, velocity vector field, velocity and pressure fields scalar field in order to understand the situation of the finned-tube heat exchanger from the figure can be intuitively seen intense heat and heat flow is weak and the flow of violent and smooth areas. Then later in the number of Re deal, Nu number, heat transfer coefficient h, Fanning friction factor f, thermal resistance R and other data with variable parameters (fin spacing S, fin thickness δ, fin width a) finishing in the form of a line graph to specific qualitative analysis of the factors affecting trends.

After a simulation study, the greater the wind speed, the better the heat transfer fin width within a certain range, the wider the better heat transfer fin spacing within a certain range, the more dense heat better.

Keywords: rectangular finned tubes; numerical simulation; heat transfer characteristic; flow characteristic

目录

摘要 I

Abstract I

符号说明 I

第一章 绪论 1

1.1引言 1

1.2翅片管的简介 1

1.3翅片管国内外的研究现状 1

1.4翅片管的应用研究 1

1.5 结语 1

第二章 翅片管模型的建立 1

2.1 翅片管物理模型介绍 1

2.2翅片管几何模型 1

2.3 典型翅片管换热器—空冷器设计 1

2.4 小结 1

第三章 数值模型建立 1

3.1 Icepak软件介绍 1

3.2边界条件 1

3.3 数值参数设定及模型建立 1

3.3.1 模型建立 1

3.3.2 网格划分 1

3.3.3量检查 1

3.3.4网格划分展示 1

3.3.5网格无关性检查 1

3.4小结 1

第四章 数据处理及分析 1

4.1 传统理论计算方法 1

4.2 相关控制方程 1

4.3 模拟结果后处理计算 1

4.4 模拟结果云图分析 1

4.4.1温度场： 1

4.4.2速度矢量场： 1

4.4.3速度标量场 1

4.4.4压力场 1

4.5 模拟数据汇总及分析 1

4.5.1 翅片管间距对换热器流动和传热性能的影响 1

4.5.2 翅片管厚度对换热器流动和传热性能的影响 1

4.5.3 翅片管高度对换热器流动和传热性能的影响 1

4.6 小结 1

第五章 结果与展望 1

5.1 模拟结论 1

5.2 未来展望 1

参考文献 1

致谢 1

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