Power and flow characteristics of flexible-blade Rushton impeller

YANG Fengling; ZHANG Cuixun; SU Tenglong

doi:10.11949/0438-1157.20190960

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Power and flow characteristics of flexible-blade Rushton impeller

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Power and flow characteristics of flexible-blade Rushton impeller
- CIESC Journal Vol. 71, Issue 2, Pages: 614-625(2020)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190960
  CLC： TQ 027
- Received：21 August 2019，
  
  Revised：2019-09-27，
  
  Online First：14 August 2020，
  
  Published：05 February 2020
- 稿件说明：
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杨锋苓, 张翠勋, 苏腾龙. 柔性Rushton搅拌桨的功耗与流场特性研究[J]. 化工学报, 2020, 71(2): 614-625

YANG Fengling, ZHANG Cuixun, SU Tenglong. Power and flow characteristics of flexible-blade Rushton impeller[J]. CIESC Journal, 2020, 71(2): 614-625
杨锋苓, 张翠勋, 苏腾龙. 柔性Rushton搅拌桨的功耗与流场特性研究[J]. 化工学报, 2020, 71(2): 614-625 DOI： 10.11949/0438-1157.20190960.

YANG Fengling, ZHANG Cuixun, SU Tenglong. Power and flow characteristics of flexible-blade Rushton impeller[J]. CIESC Journal, 2020, 71(2): 614-625 DOI： 10.11949/0438-1157.20190960.

摘要

基于传统的Rushton桨，开发了一种柔性叶片Rushton搅拌桨。采用数值模拟方法研究了柔性桨的功耗及层流和湍流流场特性，并分别采用扭矩测量法和粒子图像测速法进行了实验验证。结果表明，对于实验规模的搅拌容器，当介质黏度与甘油接近时，可用橡胶作为柔性桨叶制作材料。Reynolds数≤100时，柔性桨的功耗大于刚性桨；Reynolds数大于该值后，柔性桨的功耗小于刚性桨。柔性桨叶对被搅拌流体具有自适应特性，流固耦合作用下产生的变形增加了流体的径向流动能力。搅拌低黏度流体时，柔性桨能提升近桨区流体的速度，增加桨叶远端流体的循环流动能力；搅拌高黏度流体时，近桨区和桨叶远端流体的速度均大于刚性桨。就尾涡而言，柔性桨产生的涡量较小，耗能少。

Abstract

Based on the traditional Rushton impeller

a flexible-blade Rushton impeller was developed. The emphasis was layed on characterization of the power and flow characteristics of this flexible-blade Rushton impeller. The power consumption as well as laminar and turbulent flow fields was numerically investigated by using the computational fluid dynamics (CFD) technique. Besides

they were experimentally validated by employing the dynamic torque sensor and particle image velocimetry (PIV)

respectively. The results show that

when the viscosity of the fluid medium is close to that of glycerin

rubber can be used as the material for making flexible blade for the experimental scale stirred vessel. Power consumption of flexible-blade impeller is greater than the rigid impeller when Reynolds number is no more than 100. However

after that value

with the increase of Reynolds number

flexible-blade impeller consumes less power. The fluid-structure interaction (FSI) makes the flexible blades adaptable to the agitated fluid by deformation and accordingly

increases the radial flow capacity of the fluid. Specifically

when the viscosity fluid is low

flexible blade impeller can improve velocity of fluid near the blade and improve circulation capacity of fluid away from the impeller. When the agitated fluid has high viscosity

flexible-blade impeller can increase fluid velocity both near and far from the blade. As far as tailing vortex is concerned

flexible-blade impeller produces small magnitude vortex and is less energy consuming.

关键词

Keywords

references

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