改进型框式组合桨搅拌釜内流场特性

doi:10.16085/j.issn.1000-6613.2019-0848

摘要/Abstract

摘要：

对5m³树脂反应釜及釜内改进型框式-二斜叶双层组合桨等比例缩小建立模型，基于计算流体力学（CFD）中的多重参考系法对该双层组合桨搅拌釜流场进行了模拟研究，并利用粒子图像测速（PIV）实验对模拟结果进行了验证。分析了桨叶离底间距、桨间距及组合桨安装角度的变化对流场产生的影响。随着离底间距的增大，搅拌釜下层框式桨横梁处产生往槽底的轴向流强度会逐渐减弱，不利于底部物料的混合；桨间距的增加导致两桨间对流减弱，不利于两桨间流体的混合，当桨间距与釜内径的比值为0.77时，搅拌釜内的整体流动情况较好。对上下层桨叶安装角度分别为0°、45°和90°这3种工况下的釜内流场特性研究表明，安装角度为90°时，斜叶桨产生的轴向流强度最大，此时搅拌釜内流体的混合效果最好。研究结果为改进型框式桨与二斜叶桨双层组合桨应用于树脂聚合反应实际工程提供参考。

关键词: 改进型框式组合桨, 混合, 粒子图像测速, 计算流体力学

Abstract:

The 5m³ resin reactor equipped with an improved frame type-two oblique double layer combined impellers was scaled down，and its calculation model was established. The flow field in the mentioned stirred tank was numerically investigated by using multi-reference frame method based on the computational fluid dynamics (CFD) simulation code Fluent, and the simulation results were validated by PIV experiments. The effects on the flow field arising from the installation height of impellers (C₁), the distance between two impellers (C₂) as well as the installation angle of combined impeller (β) were investigated. With the increase of C₁, the axial flow from the beam of frame impeller to the bottom of the stirred tank will gradually decrease, which is not conducive to the mixing of the materials in the bottom of the tank. The increase of C₂ leads to the weakening of convection between the two propellers, which is not conducive to the mixing of fluid between the two propellers. When the ratio of propeller spacing to vessel diameter is 0.77, the overall flow in the stirred tank is better. The flow field characteristics of the blade installation angles of 0°, 45°and 90°show that the axial flow intensity produced by the inclined blade is the largest when β is 90°, and the mixing effect of the fluid in the stirred tank is the best. The results provide a reference for the application of the improved frame type-two oblique double layer combined impeller in the practical engineering of resin polymerization reaction.

Key words: improved frame type combined impeller, mixing, particle image velocimetry （PIV）, computational fluid dynamics（CFD）

中图分类号:

TQ022

周勇军,袁名岳,孙存旭. 改进型框式组合桨搅拌釜内流场特性[J]. 化工进展, 2019, 38(12): 5306-5313.

Yongjun ZHOU,Mingyue YUAN,Cunxu SUN. Investigating on flow field in stirred tank equipped with improved frame type combined impellers[J]. Chemical Industry and Engineering Progress, 2019, 38(12): 5306-5313.

图/表 13

图1 改进型框式组合桨尺寸及结构图

表1 搅拌槽及桨叶主要结构参数

参数	H	R	D₁	D₂	d	C₁	C₂	C₃	B
尺寸/mm	675	430	300	330	240	100	310	130	20

图2 计算域网格示意图

图3 径向速度分布

表2 搅拌槽的几何和操作参数

工况	β/(°)	C₁/mm	C₂/mm
1	0	75	330
2	0	100	330
3	0	125	330
4	0	100	290
5	0	100	370
6	45	100	330
7	90	100	330

图4 不同离底间距下的流线及速度矢量图

图5 不同层间距下的流线及速度矢量图

图6 不同桨叶安装角度下的流线及速度矢量图

图7 湍动能云图

图8 不同角度下湍动能对比图

图9 搅拌釜流场测试平台1—PIV采集处理系统；2—相机；3—搅拌釜及方槽；4—液压升降平台；5—激光器；6—控制平台

图10 实验与模拟流场对比图

图11 径向及轴向速度对比图

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