摘要
用CFD软件模拟了3种传统径向流搅拌桨—平直叶式、半圆管式和非对称抛物线式搅拌桨的功率消耗和泵送能力等搅拌性能,研究了不同桨叶结构和尺寸对搅拌桨功率准数和泵送能力的影响,设计扇环抛物面桨叶结构,比较了新型桨与传统桨的功率准数、泵送效率等搅拌性能和轴向投影面积率的差异.结果表明,桨叶外缘顶点曲率增大可减小功率准数和提高泵送效率,轴向高度减小可使功率准数降低但对泵送效率提升不大.基于空间自由曲面设计的带有新型非对称扇环抛物面桨叶的搅拌桨操作性能最佳,比非对称抛物线式搅拌桨功率准数下降30.8%,泵送效率提高22.6%.新型搅拌桨轴向投影面积率比非对称抛物线式搅拌桨增加21.5%,能用于气液分散操作.
The CFD simulations were carried out to study the power consumption and pumping performance of three traditional radial flow impellers-fiat blade disc turbine, semi-circular disc turbine and asymmetric parabolic disc turbine BT （Bakker Turbine）. The influence of various blades structure and size on the power number and pumping capacity of impellers was investigated. A novel impeller with annular sector paraboloid blades was designed and proposed. The stirring performance such as power number, pumping efficiency and axial projection area ratio between the new designed impellers and traditional impellers were compared. The results showed that increasing the vertex curvature of the blade outer edge would reduce the power number and improve the pumping efficiency. Reducing the axial height of the blade outer edge would also reduce the power number, but the pumping efficiency was not improved. The impeller FT （Fan-shaped Turbine） with a novel asymmetric annular sector paraboloid blade based on spatial free-form surface design showed the best operational performance. Compared with BT impeller, the power number of the fan-shaped turbine was decreased by 30.8%, the pumping efficiency was increased by 22.6%, and the axial projection area ratio of impeller was increased by 21.5%. The novel impeller would have a promising application in gas-liquid dispersion operations.
出处
《过程工程学报》
CAS
CSCD
北大核心
2017年第4期677-683,共7页
The Chinese Journal of Process Engineering
基金
国家高技术研究发展计划(863)资助项目(编号:2012AA021201)
中央高校基本科研业务费专项资金资助项目(编号:JUSRP51632A)
关键词
搅拌桨设计
CFD模拟
功率准数
泵送效率
扇环抛物面桨叶
design of impeller
CFD simulation
power number
pumping efficiency
annular sector paraboloid blade
