摘要：在现代的工业自动化控制领域里，调节阀也称为控制阀，是接受了调节控制单元给出的控制信号，通过动力操作来改变介质流量与压力等参数的最终控制元件。本文根据零件图并结合建模软件，模拟出阀门内部流体流动的流道模型，并根据实际工况进行模型简化；然后应用分析软件对阀内流动现象进行了数值计算，初步得到了阀门内部流体流动的规律。根据情况的分析，提出了适当增加盘片级数和流道数目的改进方法，对其进行了流动模拟后，结果说明了改进结构能在一定程度上减少或避免气蚀对阀门的影响，为日后的结构改进中提供了理论依据，可以减少一些不必要的修复作业，进而减少了维修费用，提高了经济效益。68698

毕业论文关键词： 迷宫盘片；降压；气蚀

Optimum Design of Labyrinth Pressure Regulating Valve

Abstract：In the field of modern industrial automation and control, the control valve, also known as the control valve, is controlled by the adjustment control unit output signal, by means of power to change the media flow and pressure and other process parameters of the final control components. According to the part drawing and the modeling software, the flow path model of the fluid flow inside the valve is simulated. Then, the internal flow of the valve is obtained by numerical analysis. The law of flow. According to the analysis of the situation, an improved method of increasing the number of discs and the number of runners is put forward. After the flow simulation is carried out, the results show that the improved structure can reduce or avoid the effect of cavitation on the valve to a certain extent. The future structural improvement provides a theoretical basis, which can reduce some unnecessary repair operations, thereby reducing the maintenance costs and improve the economic efficiency.

Key Words：labyrinth disc；decompression；cavitation

目  录

1  绪论1

1.1  课题背景 1 

1.2  研究的意义1

1.3  气蚀1

1．3．1  气蚀和闪蒸2

1．3．2  防止气蚀破坏的方法2

1．4  多级降压3

1．5  国内外的研究成果4

1．6 调节阀的分类 4

1．6．1  串级式降压调节阀4

1．6．2  多层套筒式降压调节阀4

1．6．3  迷宫式调节阀5

1．7  迷宫式盘片 6

1．7．1  迷宫式流道降压原理6

1．7．2  迷宫式盘片结构7

1．8  设计内容8

1．8．1  结构设计8

1．8．2  流体模拟9

1．9  创新点及难点分析 9

2 迷宫式调节阀设计计算10

2．1  阀体的设计和计算10

2．1．1  阀体设计的基本内容10

2．1．2  阀体的结构设计10

2．1．3  阀体壁厚及其计算11

2．1．4  阀杆的设计与计算12

3  流体流动与气蚀模拟的数学模型与数值计算方法18

3．1数学模型18

3．1．1连续性方程18

3．1．2动量方程18

3．1．3能量方程19

3．1．4湍流模型方程19

3．1．5控制方程与气蚀模型20

3．2本章小结22

4  流场实体模型的建立与计算网格划分23

4．1模型及其算例总览23

4．1．1  调节阀流道实体建模23

4．1．2  迷宫盘片流道实体建模24

4．2  网格划分25

4．3  边界条件与相关参数的设定27

4．3．1  流体介质参数设定27

4．3．2  湍流模型设定28

4．3．3  边界条件的设定28

4．4  计算收敛性分析29