论文总字数：25397字

摘 要

本文介绍了运用数值模拟研究集风体结构在垂直轴风力机中的应用。其中集风体结构由扩散器和法兰组成，本研究中的聚风罩类型是平板型聚风罩。在数值分析中，我们运用标准κ−ε模型研究了垂直轴风力机的空气动力特性。主要讨论了集风体结构对风力机输出功率的影响和叶片数对集风体结构垂直轴风力机输出功率的影响。结果表明，集风体结构通过增加进口处来流风速，能在较大的叶尖速比范围内提高输出功率。通过比较功率系数发现，与传统垂直轴风力机相比，集风体结构垂直轴风力机功率增加了约2.5倍。通过改变集风体结构垂直轴风力机的叶片数，可以发现二叶片比三叶片的集风体结构垂直轴风力机输出功率高，且出现较高功率系数值所对应的叶尖速比范围更大。

关键词:垂直轴风力机 集风体结构 数值模拟 流场分析

Improvement of vertical axis darrieus wind turbine based on

wind-lens

ABSTRACT

This thesis introduced the application of wind-lens for vertical axis wind turbines using numerical simulation. The wind-lens is composed of the diffuser and flange. In this paper, the diffuser is composed of flat plate.In numerical analysis, we studied the aerodynamic characteristics of vertical axis wind turbines using the standard k-ε model. This thesis mainly discussed the influence of the wind-lens and number of blades on the output power of the vertical axis wind turbines. The results show that the output power increased in a large range of tip speed ratio by increasing wind speed at the inlet. By comparing the power coefficient, it is not difficult to find that the wind turbines with wind-lens demonstrated power augmentation by a factor of 2.5 compared with a bare vertical axis wind turbines. By changing the number of blades of the vertical axis wind turbines, it is found that the output power of the two blades is higher than that with three blades, and show the larger range of the blade tip speed ratio.

Key Words:Vertical axis wind turbines; Wind-lens; Numerical analysis; Flow field analysis

目 录

摘 要.............................................................................................................................Ⅰ

ABSTRACT...............................................................................................................Ⅱ

1. 绪论..............................................................................................................1

1.1引言......................................................................................................................1

1.2垂直轴风力机研究现状......................................................................................2

1.3集风体结构应用研究现状..................................................................................2

1.4研究内容..............................................................................................................5

第二章 流体动力学基本理论..............................................................................6

2.1流体动力学基本理论.........................................................................................6

2.2流体动力学基本方程.........................................................................................6

2.3翼型的气动特性.................................................................................................8

2.4垂直轴风力机的动态失速...............................................................................11

1. ICEM CFD模型的建立.......................................................................13

3.1 CFD软件建模..................................................................................................13

3.2 Fluent模型设置................................................................................................16

3.3 Fluent模型计算................................................................................................20

第四章 结果讨论与分析.....................................................................................22

4.1集风体结构对垂直轴风力机输出功率的影响...............................................22

4.2叶片数对集风体结构垂直轴风力机输出功率的影响...................................26

4.3风力发电的经济性分析...................................................................................27

第五章 结论...........................................................................................................29

参考文献..................................................................................................................30

致 谢..................................................................................................................34

1. 绪论

1.1引言

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