摘要
采用CFD方法对底部不同结构尺寸对数螺线挡板的搅拌釜内流场特性进行了数值模拟。模拟采用多重参考系方法、滑动网格法和k-ε湍流模型。在100r.min-1转速下,对不同结构尺寸底部挡板流场进行模拟分析。结果表明:增大底部挡板弦长与宽度有利于强化搅拌釜混合效果,缩短混合时间。底部挡板改善了叶轮区以下区域的流动状况,轴向流动与挡板弦长和宽度成正相关,与离心距离成负相关。底部挡板对将剪切速率有一定的提高,增加弦长与宽度有利于剪切水平提高。
Numerical simulation on the flow field characteristics in stirred tank with different structure size of bottom logarithmic spiral baffle was conducted by computational fluid dynamics （CFD） method. Simu- lation was conducted by multi - reference frame method, sliding grid method and k-ε turbulent model. Under the 100r · min-1, simulation analysis was performed on bottom baffle＇s flow field of different structure size. The result shows that： increasing the width and chord length of bottom baffle gives advan- tage to strengthening the mixing performance of stirred tank and shortening the mixing time. The bottom baffle can improve the flowing situation under impeller area, and the axial velocity has a positive correla- tion with width and chord length, negative correlation increase shear rate to a certain degree. Increasing the shear strength. with distance to the center. The bottom baffle can chord length and width is beneficial to improving
出处
《常州大学学报（自然科学版）》
CAS
2013年第2期67-71,共5页
Journal of Changzhou University：Natural Science Edition
关键词
搅拌釜
底部挡板
速度场
混合时间
数值模拟
stirred tank
bottom baffle
velocity field
mixing time
numerical simulation
