摘 要

管道输送已不再局限气液的运输，在实际的工程应用中固液混合的管道输送更为常见。用不同的运输方式其运输效率和能量损失各不相同。此外在相同的输送方式下，运输颗粒的粒径、运输的距离和输送物料等参数的不同其运输效率和能量损失也各不相同。国内外研究者通过大量仿真试验等手段推导一些有实践意义的经验公式，这些公式都有自己的适用条件和范围，他们的运算过程也十分复杂。本论文的研究对象是粗颗粒管道垂直输送，运用仿真模拟分析的方法，对管道的体积分数的分布、压力变化关系的对比分析，其数据结果可为管道运输的实际案例提供一定的理论指导。

本文第一部分是对研究对象以及经典流体模型做适当地分析与研究。第二部分是建模计算，使用前处理软件对垂直管道进行模型的建立和网格的划分，再利用软件Fluent进行流体参数的计算，本文重点利用Fluent中的欧拉-欧拉模型在垂直管道的流域内仿真模拟计算。第三部分是对于仿真计算结果进行各参数的分析和总结，例如管道内粗颗粒的体积分数分布、流速分布、压力变化曲线进行分析，得出本文的研究结果：

1）模拟技术与实际的工程案例两者之间的相似度是可以通过模拟仿真的结果与实验表现出的结果对比判断的，相似度高到一定值时就可以作为研究的一种手段

2）在使用欧拉-欧拉方法的两相流体模型能够很好地模拟管道内的真实的流动状态。仿真数值结果的颗粒浓度、速度分布以及压力损失与实验值表现出良好的一致性。

3）在较低的初速度、较高的颗粒浓度的模拟工况下，欧拉法的仿真模拟结果与实际的结果有较大的偏差。

关键字：垂直管道输送；粗颗粒；欧拉-欧拉法;Fluent

Abstract

Pipeline transportation is no longer limited to the transportation of gas and liquid. In actual engineering applications, solid-liquid mixed pipeline transportation is more common. Transport efficiency and energy loss vary from one transport to another. In addition, under the same conveying mode, the transport efficiency and energy loss of the transport particles vary in particle size, transport distance and transporting materials. Researchers at home and abroad have deduced some practical empirical formulas through a large number of simulation experiments. These formulas have their own applicable conditions and scope, and their calculation process is also very complicated. The research object of this thesis is the vertical conveying of coarse-grained pipelines. Using the method of simulation and analysis, the paper analyzes the distribution of volume fraction and the relationship of pressure changes. The data results can provide some theoretical guidance for the actual case of pipeline transportation.

The first part of this paper is to properly analyze and study the research objects and classical fluid models. The second part is the modeling calculation. The pre-processing software is used to establish the model and the grid of the vertical pipeline. Then the software Fluent is used to calculate the fluid parameters. This paper focuses on the Euler-Eulerian model in Fluent in the vertical pipeline. Simulation calculations within the basin. The third part is to analyze and summarize the parameters of the simulation calculation results, such as the volume fraction distribution, flow velocity distribution and pressure curve of the coarse particles in the pipeline, and the results of this study are obtained:

1) The similarity between the simulation technology and the actual engineering case can be judged by comparing the results of the simulation with the results of the experiment. When the similarity is high, it can be used as a means of research.

2) The two-phase fluid model using the Euler-Eulerian method can well simulate the true flow state in the pipeline. The particle concentration, velocity distribution, and pressure loss of the simulated numerical results showed good agreement with the experimental values.

3) Under the simulated conditions of lower initial velocity and higher particle concentration, the simulation results of the Euler method have a large deviation from the actual results.

Key Words：Vertical pipe transport;Coarse particles; Euler-Euler method; Fluent

目录

摘 要 I

Abstract II

第1章 绪论 1

1.1 研究的背景以及意义 1

1.1.1管道运输的相关背景 1

1.1.2国内外研究现状 2

1.2目的及意义 3

1.3基本内容和技术方案 4

1.3.1主要研究内容 4

1.3.2研究流程 4

第2章 颗粒分类及管道输送经典阻力模型 6

2.1颗粒分类 6

2.2 三大经典阻力模型 6

2.1.1 Durand模型概述及算例 7

2.2.2陈广文模型概述 7

2.2.3 Wasp模型概述 8

2.3本章小结 11

第3章 欧拉-欧拉模型对垂直管道输送模型的建立 12

3.1 欧拉法与拉格朗日法对比和选取 12

3.1.1 Fluent对于浆体流动的数值仿真的意义 12

3.1.2有关的方程以及动量的修正 12

3.2建立模型以及划分网格 14

3.2.1计算模型几何参数的选定 14

3.2.2垂直管道模型的网格划分 14

3.3模拟参数方案的设定 14

3.4 本章小结 15

第4章 欧拉-欧拉模型对垂直管道输送结果的处理与分析 16

4.1 压力结果与分析 16

4.1.1 压降对比 18

4.2颗粒浓度分布的结果与分析 18

4.3 速度分布的结果与分析 22

4.5 本章小结 25

第5章 总结及展望 27

5.1总结 27

5.2展望 28

参考文献 29

附录A 工业管道阻力系数穆迪图 32