基于CFD的双层混合涡轮式搅拌器优化  

Optimization of Double-Layer Hybrid Turbine Agitator Based on CFD Simulation

作　　者：周振 王萌 张梦雪 朱强 陈璇 盘赛昆 ZHOU Zhen;WANG Meng;ZHANG Mengxue;ZHU Qiang;CHEN Xuan;PAN Saikun(School of Food Science and Engineering,Jangsu Ocean University,Lianyungang,Jiangsu 222000,China;School of Mechanical Engineering,Jangsu Ocean University,Lianyungang,Jiangsu 222000,China)

机构地区：[1]江苏海洋大学食品科学与工程学院,江苏连云港222000 [2]江苏海洋大学机械工程学院,江苏连云港222000

出　　处：《轻工机械》2022年第4期79-84,94,共7页Light Industry Machinery

基　　金：横向课题基金:液态生物反应器关键技术研发及产业化研究(HKK202076)。

摘　　要：为了解决50 L通用型液体发酵罐搅拌器组合选型多而复杂的问题,课题组设计了8种符合小型发酵罐需求的双层搅拌器组合。采用CFD软件FLUENT,选取κ-ε方程湍流模型对发酵罐进行数值模拟,计算方法采用有限体积法离散守恒方程,压力-速度耦合使用SIMPLE算法,差分格式采用二阶迎风进行收敛;通过对发酵罐内流场的速度云图、矢量图、速度分布曲线、搅拌功率等进行对比分析,研究不同搅拌器组合搅拌过程中液相混合效果;选取混合效果较优的搅拌器组合,进行气、液两相混合验证。结果表明:上层为斜叶圆盘式搅拌桨、下层为直叶圆盘式搅拌桨组合发酵罐搅拌时效果较为理想,且罐内最高速度能达到0.28 m/s,搅拌功率仅为5.63 W。模拟结果为发酵罐搅拌器组合的设计与选型提供了重要的参考。In order to solve the problem of multiple and complex agitator combination selection for the 50 L general-purpose liquid fermentation tank,eight kinds of double-layer agitator combinations that meet the needs of small fermentation tanks were designed.Theκ-εequation turbulence model was used to simulate the fermentation tank by using CFD software FLUENT.The finite volume method discrete conservation equation was used as the calculation method,the SIMPLE algorithm was used for pressure-velocity coupling,and the second order upwind scheme was used for differential format convergence.Through the contrastive analysis of the velocity cloud diagram,vector diagram,velocity distribution curve and mixing power of the flow field in the fermentation tank,the liquid phase mixing effect in the mixing process of different agitator combinations was studied.The agitator combination with better mixing effect was selected to verify the gas-liquid two-phase mixing.The results show that the mixing effect of the fermentation tank was ideal when the inclined blade disc impeller was on the top and the straight blade disc impeller was on the bottom,and the maximum speed in the tank could reach 0.28 m/s and the mixing power is only 5.63 W.The simulation results provide an important reference for the design and selection of fermenter agitator combinations.

关 键 词：涡轮搅拌器 多级搅拌 计算流体动力学 κ-ε方程湍流模型 有限体积法 FLUENT 

分 类 号：TQ920.5[轻工技术与工程—发酵工程] TH164[机械工程—机械制造及自动化]