摘要
针对单层双桨叶圆形搅拌槽不同参数(桨叶角度、桨叶离底高度、桨叶宽度、桨叶直径,水平加料点),运用CFD软件Fluent对搅拌槽内流场进行数值模拟,计算并分析了各个参数对混合时间、搅拌功率和单位体积混合能等3个指标的影响;进行了不同桨叶角度和桨叶离底高度条件下的实验研究,运用电导率测试法测量搅拌溶液浓度的变化曲线,并与数值模拟结果进行了对比。研究结果表明,单位体积混合能指标能综合混合时间与搅拌功率,可作为参数优化的指标;在单因素条件下,桨叶角度优化为20°、桨叶离底高度为500 mm、桨叶宽度为80 mm、桨叶直径为300 mm,水平加料点为100 mm;实验研究中示踪剂Na Cl溶液的浓度变化曲线与数值模拟的溶液浓度变化曲线的相关系数在0.77~0.86,故可通过数值模拟的方法在一定程度上进行搅拌槽参数优化设计。
CFD software Fluent was used to simulate the flow field of agitator tank with different parameters of circular agitator tank with single layer and two blades,including blade angle,height of blade from the bottom,blade width,blade diameter and horizontal feeding point. The effects of three indexes,including mixing time,stirring power and unit volume mixing power,were analyzed,and the experimental study of different blade angle and height of blade from the bottom on tracer concentration were carried out,and concentration was measured by electroconductibility and was compared with the result of simulation. The results show that the index of unit volume mixing power can be used for agitator tank parameter optimization,and under the single factor consideration,blade angle is optimization as 20°,height of blade from the bottom 500 mm,blade width 80 mm,blade diameter 300 mm and horizontal feeding point 100 mm. Also,it is noted that the correlation coefficient of tracer Na Cl concentration variation curves between the experiments and the simulations is from 0. 77,to 0. 86）. This study makes it possible for agitator tank parameter optimization with numerical simulation.
作者
李欣欣
向民奇
黄振峰
邓远锋
成刚
潘瑞
LI Xin-xin;XIANG Min-qi;HUANG Zhen-feng;DENG Yuan-feng;CHENG Gang;PAN Rui(College of Mechanical Engineering,Guangxi University,Nanning 530004,China;Guangxi Bossco Environmental Protection Science and TechnologT Co.,Ltd.,Nanning 530007,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2018年第3期947-957,共11页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51365006)
广西大学横向项目(BB30100005)
关键词
搅拌槽
搅拌实验
搅拌功率
单位体积混合能
混合时间
数值模拟
agitator tank
stirring experiment
stirring power
unit volume mixing power
mixing time
numerical simulation
