柔性Rushton搅拌桨混合性能的实验研究

doi:10.11949/0438-1157.20190961

化工学报 ›› 2020, Vol. 71 ›› Issue (2): 626-632.DOI: 10.11949/0438-1157.20190961

柔性Rushton搅拌桨混合性能的实验研究

杨锋苓^1,^2,³(),张翠勋⁴,李美婷¹

^1.山东大学机械工程学院，山东济南 250061
^2.高效洁净机械制造教育部重点实验室(山东大学)，山东济南 250061
^3.山东大学机械工程国家级实验教学示范中心，山东济南 250061
^4.山东天力能源股份有限公司，山东济南 250100

收稿日期:2019-08-21 修回日期:2019-12-25 出版日期:2020-02-05 发布日期:2020-02-05
通讯作者: 杨锋苓
作者简介:杨锋苓（1979—），男，博士，副教授， fly@sdu.edu.cn
基金资助:
山东省重点研发计划项目(2016GGX103035)

Experimental study on mixing characteristics of flexible-blade Rushton impeller

Fengling YANG^1,^2,³(),Cuixun ZHANG⁴,Meiting LI¹

^1.School of Mechanical Engineering，Shandong University，Jinan 250061，Shandong, China
^2.Key Laboratory of High-Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061, Shandong, China
^3.National Experimental Teaching Demonstration Center of Mechanical Engineering, Shandong University, Jinan 250061, China
^4.Shandong Tianli Energy Co. , Ltd. , Jinan 250100, China

Received:2019-08-21 Revised:2019-12-25 Online:2020-02-05 Published:2020-02-05
Contact: Fengling YANG

摘要/Abstract

摘要：

提高混合效率是流体搅拌混合领域的重点研究内容之一。几十年来，人们在开发新型搅拌桨及研发流体混合新技术方面做了大量工作。基于刚性Rushton桨，开发了一种柔性叶片Rushton搅拌桨，并以罗丹明6G为荧光剂，采用平面激光诱导荧光法对介质为水时该桨在湍流状态下的混合性能进行了实验测试研究。结果发现，标定实验结果表明，荧光剂强度与浓度呈线性关系，可以此为基准衡量同等实验条件下的宏观混合时间。荧光剂的扩散情况表明，与刚性桨相比，柔性桨具有更好的混合性能，尤其在混合的初始阶段，混合均匀程度及混合速度均有一定的优势。与刚性桨混合时间的对比表明，柔性桨的宏观混合时间较短，有助于提高流体混合效率。研究结果为该桨的工业应用奠定了基础。

关键词: 搅拌容器, 柔性Rushton搅拌桨, 混合, 实验测量, 平面激光诱导荧光

Abstract:

Rapid mixing is the key factor to efficient operation of many industrial devices involving fluid flow. During the past several decades, extensive contributions have been made to improve the mixing effect and efficiency either by modifying and developing new types of impellers, or by employing and developing new fluid mixing techniques. In this paper, the turbulent mixing characteristics of the flexible-blade Rushton impeller developed by ourselves were experimentally studied by the planar laser induced fluorescence (PLIF) technique. Roddinmin 6G was used as fluorescer. The agitated fluid was water. Result of the calibration experiment shows that the fluorescer luminosities are linear with their concentration, which can be used as a benchmark to measure the mixing time under the same experimental conditions. Diffusion processes of fluorescer show that flexible-blade Rushton impeller has better mixing performance than the standard Rushton impeller. It can improve the mixing uniformity and increase the mixing speed, especially at the initial stage of the mixing process. By comparison with standard Rushton impeller, it was found that mixing time of flexible-blade Rushton impeller is shorter, which is helpful to improve the fluid mixing efficiency. Results of this work lay a solid foundation for the industrial application of this impeller.

Key words: stirred vessel, flexible-blade Rushton impeller, mixing, experimental measurement, planar laser induced fluorescence

中图分类号:

TQ 027

杨锋苓, 张翠勋, 李美婷. 柔性Rushton搅拌桨混合性能的实验研究[J]. 化工学报, 2020, 71(2): 626-632.

Fengling YANG, Cuixun ZHANG, Meiting LI. Experimental study on mixing characteristics of flexible-blade Rushton impeller[J]. CIESC Journal, 2020, 71(2): 626-632.

图/表 8

图1 搅拌桨及搅拌容器结构示意图

Fig.1 Impellers and stirred vessel

图2 平面激光诱导荧光法实验测试系统示意图1—计算机；2—同步器；3—激光器；4—搅拌容器；5—搅拌桨；6—CCD相机

Fig.2 Diagram of PLIF experimental set-up

图3 荧光剂浓度标定曲线

Fig.3 Calibration of fluorescer concentration

图4 荧光剂加入点及浓度监测点示意图(单位：mm)

Fig.4 Fluorescence adding and monitoring positions

图5 转速 N=0.5 r·s -1时荧光剂的扩散过程

Fig.5 Dispersion of fluorescence at speed N=0.5 r·s -1

图6 转速 N=2 r·s -1时荧光剂的扩散过程

Fig.6 Dispersion of fluorescence at speed N=2 r·s -1

图7 转速 N=3.5 r·s -1时荧光剂的扩散过程

Fig.7 Dispersion of fluorescence at speed N=3.5 r·s -1

表1 宏观混合时间实验测量结果

Table 1 Experimentally determined mixing time

转速 N/(r·s ^-1)	桨型	宏观混合时间 t/s				平均混合时间/s
转速 N/(r·s ^-1)	桨型	P ₁	P ₂	P ₃	P ₄	平均混合时间/s
0.5	刚性桨	12.5	6.5	7.0	10.0	9.0
0.5	柔性桨	11.0	6.0	7.0	9.0	8.3
2	刚性桨	9.0	4.5	5.5	8.0	6.8
2	柔性桨	7.0	3.0	3.5	5.5	4.8
3.5	刚性桨	6.5	2.0	3.3	5.3	4.3
3.5	柔性桨	5.0	1.5	2.5	4.3	3.3

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柔性Rushton搅拌桨混合性能的实验研究

Experimental study on mixing characteristics of flexible-blade Rushton impeller

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