摘要：随着现代工业的进步，工厂对物料的混合要求逐渐增加。本文为了满足上述需求，研究设计了一类新型搅拌设备，即斜叶-透平桨异速复合搅拌槽。异速复合搅拌槽与传统搅拌槽相比，混合特性，流体运动方式均有不同。本文主要探讨低黏度的牛顿流体

（水）在异速复合搅拌槽的搅拌下运动规律的冷态模拟，实验原理主要运用碘与硫代硫酸钠氧化还原褪色。运用计时器获得搅拌槽内的混合情况及混合时间。利用所得出的数据绘制相应变化曲线，得出规律。实验考察了转速比（0.5、1、1.5、2）、桨叶直径、桨叶旋转方向、桨叶排出流方向及桨叶间距的影响。实验研究发现：随着转速比、桨叶直径及桨叶间距增大，搅拌槽内混合时间缩短；同向旋转条件下的混合时间短于异向旋转条件下的混合时间；低转速比下，斜叶桨排出流为上提条件下的混合时间短于其排出流方向为下压条件下的混合时间；而高转速比条件下，规律则相反。

关键词：同轴异速；组合桨；搅拌槽；混合时间；相互作用；桨叶排出流

Experimental Observation of Mixing Characteristics in Stirred Tank with All-speed Compound Impeller

Abstract：With the advancement of modern industry, the requirements for the mixing of materials by factories have gradually became higher. In order to meet the demand, this paper researched and designed a new type of stirring equipment, namely the differential blade-tumbler mixing tank. Differential compound stirred tank compared with the traditional mixing tank, mixing characteristics, fluid movement are different. This paper mainly discusses the cold simulation of the motion law of low viscosity newtonian fluid (water) under the stirring of differential compound stirred tank. The experimental principle mainly uses iodine and sodium thiosulfate redox fading. Use the timer to get the mixing and mixing time in the mixing tank.

Use the data obtained to draw the corresponding change curve and draw the law. The effects of speed ratios (0.5, 1, 1.5, 2), the diameter of the blades, the direction of rotation of the blades, the direction of discharge of the blades, and the pitch of the blades were examined.

Experimental study found that: with the rotation speed ratio, the diameter of the blade and the pitch of the blade increased, the mixing time in the mixing tank was shortened; the mixing time under the same rotation condition was shorter than the mixing time under the condition of the reverse rotation; under the low rotation speed ratio, The mixing time of the inclined blade propeller discharge flow under the uplift condition is shorter than the mixing time under the down pressure condition for the outflow flow direction, while the law is reversed under the high rotation speed ratio condition.

Key words: coaxial; combined impeller; stirred tank; mixing time; interaction; discharging flow of the impeller

目录

1.绪论 1

1.1搅拌槽装置研究概述 1

1.2搅拌器混合过程的研究尺度及进展 1

1.3 宏观混合的影响因素探究 1

1.3.1转速 1

1.3.2桨叶类型 2

1.3.3桨叶层数 2

1.3.4桨叶方向 3

1.3.5液体性质 3

1.4研究目的和意义 3

1.4.1研究目的 3

1.4.2研究意义 3

1.5小结 3

2.实验材料与方案 3

2.1实验药剂制备 4

2.2仪器与设备 4

2.3实验原理 6

2.4实验方法 6

2.5软件 7

2.6不同条件同轴异速搅拌槽的搭建 7

2.6.1搅拌槽桨叶大小以及间距确定 7

2.6.2搅拌槽桨叶直径确定 7

2.6.3转速比的确定 7

2.6.4桨叶旋转方向的确定 7

2.7实验方案 7

2.7.1转速比的影响 7

2.7.2桨叶旋转方向的影响 8

2.7.3上下桨叶间距的影响 9

2.7.4上下桨叶直径的影响 10

2.8实验步骤 11

2.8.1溶液配置与标定 11