摘要  利用FLUENT 6.3软件，采用层流模型、标准κ-ε模型和RNG κ-ε模型的方法，对无挡板六直叶圆盘涡轮桨搅拌槽在不同雷诺数下的流动特性及功率特性进行了数值模拟，得到了Np-Re曲线，并对流场进行了分析，给出搅拌槽内速度分布和湍流动能分布图。结果表明，桨中心处速度很小，而在桨叶尖端速度最大；在层流流区，计算得到的功率曲线与文献数据基本一致；在过渡流区域，选用不同的模型进行模拟，计算结果相差不大；在湍流流区，计算得到的功率准数存在较大误差。64290

毕业论文关键词  计算流体力学(CFD）   涡轮桨   搅拌槽    功率曲线 

毕业设计说明书（论文）外文摘要

Title  Numerical simulation of the Rushton turbine stirred tank without baffles at different Reynolds numbers         

Abstract  

Based on FLUENT 6. 3 software , the flow characteristics and power characteristics of the Rushton turbine stirred tank without baffles at different Reynolds numbers were numerically simulated adopting laminar model,standard κ-ε model and RNG κ-ε model. The Np-Re curves and power curves were drawn,and the flow field was analyzed.The distributions of velocity vectors and turbulence kinetic energy were given.The results show that the speed at the center of paddle was small,but the speed at the tip of paddle was maximum.In the laminar flow region,Power curve obtained by the calculation was consistent with literature data base.In the transition flow region,choose different model,the calculation results had little difference.In the turbulent flow region,the power number obtained by the calculation had some error.

 Keywords  Computational fluid dynamics; Rushton turbine stirred tank;   Power curve

目录

1  绪论 1

1.1  工业背景与研究意义 1

1.2  Fluent的介绍及应用 2

1.2.1  Fluent软件的简介 2

1.2.2  Fluent软件的组成 3

1.2.3  解决流体力学问题的步骤 4

1.2.4  Fluent软件的应用 4

1.3  CFD的发展概况 5

1.4  搅拌功率的研究意义 7

2  搅拌槽流体力学计算原理 8

2.1  流体流动 8

2.2  标准κ-ε模拟法 8

2.4  计算方法 9

3  计算模拟结果与分析 10

3.1  搅拌槽的结构 10

3.2  网格划分 11

3.3  边界条件 12

3.4  模拟参数的选取 12

3.5  模拟结果与分析 13

3.5.1  流场分析 13

3.5.2  湍流动能 20

3.5.3  功率准数 21

结  论 24

致  谢 25

参考文献 26

1  绪论