山东科学 ›› 2021, Vol. 34 ›› Issue (4): 9-13.doi: 10.3976/j.issn.1002-4026.2021.04.002

• 海洋科技与装备 • 上一篇    下一篇

生物搅拌槽中挡板结构对搅拌效果的影响

董巍,韩少彬,刘乃友   

  1. 齐鲁工业大学(山东省科学院) 山东省科学院海洋仪器仪表研究所 山东省海洋监测仪器装备技术重点实验室 国家海洋监测设备工程技术研究中心,山东 青岛266100
  • 收稿日期:2020-10-26 出版日期:2021-07-30 发布日期:2021-07-30

Influence of a baffle structure on the stirring effect of a biological stirred tank

DONG Wei,HAN Shao-binLIU Nai-you   

  1. Shandong Provincial Key Laboratory of Marine Monitoring Instrument Equipment Technology,National Engineering and Technological Research Center of Marine Monitoring Institute of Oceanographic Instrumentation, Qilu University of Technology(Shandong Academy of Sciences), Qingdao 266061, China
  • Received:2020-10-26 Online:2021-07-30 Published:2021-07-30
  • About author:董巍(1982—),男,助理工程师,研究方向为海洋仪器及设备研发。E-mail:361928448@qq.com

摘要: 利用Fluent软件,对无挡板搅拌槽和有挡板搅拌槽的搅拌效果进行了对比。基于有限体积法,采用RANSReynolds-averaged Navier-Stokes)模型对搅拌槽中的流场进行了模拟仿真,获得了搅拌过程中湍流的流速分布、压力分布和湍动能,对流场的结构形态进行了分析。结果表明:在搅拌槽中设置的挡板宽度越大,流场内的速度值波动就越大,速度矢量变化就越大,湍动能随之变大,有利于提高搅拌槽的搅拌效果;从压力分布上看搅拌槽中的最小压力均出现在距离搅拌槽底面0.12 m处;带档板结构搅拌槽的最小压力低于不带挡板的情况;搅拌槽中的挡板会导致流场中的速度矢量具有较强的旋流效应,流场内速度梯度变化较大,形成较强的涡流,有利于搅拌过程中发生更强烈的化学反应。

关键词: 挡板结构, 生物搅拌槽, 速度分布, 速度矢量, 压力分布, RANS模型, 湍动能

Abstract: Using Fluent, the difference in the stirring effect of a biological stirred tank with and without baffle was calculated and compared. Based on the finite volume method, the RANS(Reynolds-averaged Navier-Stokes model was used to simulate the flow field in the biological stirred tank, and the velocity distribution, pressure distribution and turbulent kinetic energy in the stirring process were obtained. The structural morphology of the flow field was analyzed. The results show that the larger the baffle width, the greater the velocity fluctuation, the greater the velocity vector change, and the greater the turbulent kinetic energy, which is helpful in improving the stirring effect of the biological stirred tank. According to the pressure distribution analysis, with or without a baffle, the minimum pressure in the biological stirred tank is 0.12 m away from the bottom of the tank. The minimum pressure with a baffle is lower than that without a baffle, The velocity vector in the flow field of the stirred tank with baffle exhibits a stronger cyclone effect, which could result in more intense chemical reaction occurring during the stirring process.

Key words: baffle structure, stirred tank;velocity distribution; velocity vector, pressure distribution, RANS model, turbulent kinetic energy

中图分类号: 

  • TQ630.5+4