改进型INTER-MIG桨搅拌槽内流场的PIV实验

王璐璐 周勇军 鲍苏洋 辛伟  陶兰兰

doi:10.12034/j.issn.1009-606X.216263

过程工程学报 >

2017 , Vol. 17 >Issue 3: 447 - 452

DOI: https://doi.org/10.12034/j.issn.1009-606X.216263

流动与传递

改进型INTER-MIG桨搅拌槽内流场的PIV实验

王璐璐周勇军鲍苏洋辛伟陶兰兰

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1. 南京工业大学机械与动力工程学院，江苏南京 211816；
2. 江苏省特种设备安全监督检验研究院国家化工设备质量监督检验中心，江苏苏州 215600

收稿日期: 2016-07-28

修回日期: 2016-11-15

网络出版日期: 2017-06-14

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PIV Experiments on Flow Field of Stirred Tank with Improved INTER-MIG Impeller

Lulu WANG Yongjun ZHOU Suyang BAO Wei XIN Lanlan TAO

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1. College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, China;
2. National Quality Supervision and Inspection Center of Chemical Equipment, Special Equipment Safety Supervision Inspection Institute of Jiangsu Province, Suzhou, Jiangsu 215600, China

Received date: 2016-07-28

Revised date: 2016-11-15

Online published: 2017-06-14

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摘要

采用粒子图像测速技术(PIV)研究了双层改进型INTER-MIG桨搅拌槽内的流场，考察了流体粘度m、桨叶转速、底桨尺寸对流场的影响. 结果表明，m<962.5 mPa·s时随粘度增大，局部涡流增多，对整体混合有利；m=962.5 mPa·s时形成2个涡合能力差的涡流，对整体混合不利. Re=459~918时，桨叶转速增加对叶端处无因次化速度无影响，随流体远离桨叶，无因次化速度随桨叶转速增大而增大. 底桨尺寸增大对无因次化径向速度影响较小，对底桨所在区域无因次化轴向速度影响较大，底桨尺寸满足桨槽直径比D/T=0.57时无因次化轴向速度最大，湍动能最大，搅拌功率随底桨尺寸增大而增大.

关键词： 搅拌槽; 改进型INTER-MIG桨; 粒子图像测速技术; 流场; 无因次化

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王璐璐周勇军鲍苏洋辛伟陶兰兰 . 改进型INTER-MIG桨搅拌槽内流场的PIV实验[J]. 过程工程学报, 2017 , 17(3) : 447 -452 . DOI: 10.12034/j.issn.1009-606X.216263

Abstract

The flow field in the stirred tank with double improved INTER-MIG impeller was studied by using particle image velocimetry (PIV), of which the tank was 0.43 m in diameter. The three influence factors namely the fluid viscosity, the impeller rotation speed, and the size of bottom impeller, were taken into investigation to study the influence they exerted on flow field. The results indicated that the local vortices increased according to the augment of viscosity when the viscosity was less than 962.5 mPa·s, which was beneficial to overall mixture. However, the two vortexes of poor converging capacity formed when viscosity was 962.5 mPa·s, are adverse to overall mixture. Within the range of Reynolds number between 459 and 918, the increment of impeller rotation speed almost had no effect on the dimensionless axial velocity in blade’s apex. Nevertheless, when the fluid was away from the blade, the increment of impeller rotation speed turned to cause the rise of dimensionless velocity. While less influence had been taken by the size of bottom impeller to dimensionless radial velocity, there was a significant impact of the same factor while we examined on the dimensionless axial velocity at bottom impeller area. The dimensionless axial velocity and turbulent kinetic energy reached to its maximized value when the specification of bottom impeller size was D/T=0.57. In addition, the power consumption enhanced synchronously with the size of bottom impeller.

Key words： ; font-size: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体; mso-bidi-font-size: 9.0pt" lang="EN-US">stirred tank; improved INTER-MIG impeller; particle image velocimetry; flow fluid; dimensionless

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