摘要
通过CFD模拟技术,预先建立搅拌器模型并完成网格划分,采用MRF(多重参考系法)处理旋转桨叶与静止槽壁之间的相互作用,应用Fluent模拟常用搅拌器内部流场,获取相应流动量化信息。基于相似理论,研究不同尺寸和规格搅拌桨的效能,获得各搅拌器性能参数之间的关系,研究表明:同类型桨,增加搅拌器直径或转速,其功率损耗也会增大;所得功率准数与雷诺数关系的拟合经验公式与模拟值吻合效果良好,可以用来预测不同雷诺数下对应的搅拌器功率准数值;而不同类型搅拌桨,在所研究的雷诺数取值范围内,斜叶式的排出流量准数始终高于直叶式,但当雷诺数对数值大于7.28后,最终排列结果变为二斜叶桨式>四斜叶开启>六斜叶圆盘>二直叶桨式>六直叶圆盘>四直叶开启。
In this paper,making use of CFD simulation technology to pre-establish agitator’s model was implemented,including the mesh generation.In addition,the interaction between the rotating blade and the stationary tank wall was processed by MRF(multiple reference system method)and the internal flow field of commonly-used agitators was simulated with Fluent and their corresponding flow quantization information was obtained.Based on the similarity theory,the performance of stirring paddles with different sizes and specifications was studied and the relationship between their performance parameters was obtained.The results showed that,as for the same kind of paddles,increasing the agitator’s diameter or speed will incur their greater power loss;the fitted empirical formula of the relationship between the exact number and the Reynolds number agrees well with the simulated values and can be used to predict the corresponding power value of the agitator at different Reynolds numbers;regarding the different types of stirring blades within the range of the Reynolds number studied,the skewed-leaf discharge flow rate always outperforms that of the straight-leaf type,but for the Reynolds number logarithm higher than 7.28,the final arrangement becomes into as follows:two oblique blade paddle-type>four oblique blade open-type>six oblique disc-type>two straight blade paddle-type>six straight blade disc-type>four straight blade open-type.
作者
熊一民
杨建兴
吴长松
杨斌
XIONG Yi-min;YANG Jian-xing;WU Chang-song;YANG Bin(Xi’an Modern Chemistry Research Institute;School of Chemical Engineering,Northwest University)
出处
《化工机械》
CAS
2020年第5期612-616,682,共6页
Chemical Engineering & Machinery
基金
国家重大专项
陕西省自然科学基础研究计划面上项目(2018JM1021)
青年项目(2019JQ-304)。
关键词
搅拌容器
CFD
流域
相似理论
量化分析
agitator
CFD
flow field
similarity theory
quantitative analysis
