摘要
研究转轮半径这一因素对搅拌器内气液两相混合流特性的影响,可为搅拌器的设计与优化提供依据。采用RNG k-ε湍流模型结合多参考系法对单叶轮气液搅拌器内的气液混合过程进行了模拟计算。通过模拟计算得到了搅拌器在相同通气率、相同转轮转速、不同转轮半径下的气液流动速度场以及不同方向、不同截面上气含率的分布规律,分析了不同转轮半径对搅拌器内三维流场及气含率分布的影响。模拟结果表明:在通气率不发生改变的情况下,转轮半径大小的改变对搅拌器内的气含率分布的影响较小,而对速度分布有一定的影响。
Research on the numerical simulation of gas-liquid mixing flow under the influence of radius in a stirred tank could provide references for the design of stirred tanks. The RNG k-ε turbulence model as well as multiple reference frame method was used to simulate the mixing process of gas and liquid in the single impeller stirred tank to obtain the mixing of two phases of actual flow in a stirred tank with the same ventilation rate and rotational speed,and different radiuses. The influences of different impeller ’s radiuses on the distribution regularities of velocity magnitude and gas holdup in different sections were analyzed. The results of simulation showed that the changing in radius almost caused no effects on the air volume fraction,while the velocity distribution was affected to a certain extent.
出处
《水资源与水工程学报》
CSCD
2017年第2期14-18,共5页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51578452
51178391)
陕西省工业科技攻关项目(2016GY-180)
陕西省科学研究计划项目(2014K15-03-05)
陕西省西北旱区生态水利工程重点实验室开放基金项目(106-221223)
关键词
搅拌器
转轮半径
气液两相流
气含率分布
流场分布
数值模拟
stirred tank
impeller radius
gas-liquid flow
gas holdup
flow field distribution
numerical simulation
