双螺带式搅拌器的搅拌特性及关键结构参数研究  

Study on Stirring Characteristics and Key Structural Parameters of Twin-Screw Agitator

作　　者：曾真[1] 李振南 唐涛 宋春晗 郑小涛[1] ZENG Zhen;LI Zhennan;TANG Tao;SONG Chunhan;ZHENG Xiaotao(School of Mechanical and Electrical Engineering,Wuhan Institute of Technology,Hubei Wuhan 430205,China;Wuhan Kanto Technology Co.,Ltd.,Hubei Wuhan 430200,China)

机构地区：[1]武汉工程大学机电工程学院,湖北武汉430205 [2]武汉康托科技有限公司,湖北武汉430200

出　　处：《饲料工业》2024年第12期38-44,共7页Feed Industry

摘　　要：运用Fluent软件对双螺带搅拌器的混合过程进行模拟,利用多功能搅拌实验平台进行功耗测试,验证仿真模型的合理性。结合实例,分析了边界间隙、螺带直径以及螺距对搅拌特性的影响。针对混合效果和效率(经济功耗)的定量评价难点,提出用功耗因子与轴向功耗因子的数值,表征高黏度流体混合时的能量利用效果与整体混合效果,并以此为依据对螺带式搅拌器关键几何参数进行优化。实例的模拟结果表明:当螺带直径为1 200 mm时,即螺带直径达到罐体直径0.8倍时,轴向功耗因子最大为0.232 6 s,表明轴向流体宏观混合效果最好;螺距为1 350 mm时,即螺距与螺带直径之比为1(螺旋升角为45°)时,轴向功耗因子达到最大为0.180 6 s,表明轴向流体宏观混合效果最好;随着边界间隙的减小,罐壁总速度峰值增大,表明防附着效果增强,罐壁内侧的热边界层减薄。Based on the software Fluent,we simulate the mixing process of twin-screw belt agitator.Using the multi-functional stirring experimental platform,the rationality of the simulation model is verified by the test of the power consumption.Combining with examples,the effects of boundary gap,screw belt diameter and pitch on the stirring characteristics are analyzed.For the hard spots of mixing effect and efficiency(economic power consumption),we proposed the values of power consumption factor and axial power factor to characterize the energy utilization effect and overall mixing effect of high-viscosity fluid.Take this as a basis,the key geometric parameters of the screw agitator are optimized.The simulation results of the example show that when the screw belt diameter is 1200 mm,which reaches 0.8 times of the tank diameter,the maximum of the axial power consumption factor is 0.2326 s,indicating that the axial fluid macro mixing effect is the best;when the pitch is 1350 mm,which equals to the diameter of the blade(spiral rising angle is 45°),the maximum of the axial power consumption factor is 0.1806 s,indicating that the macroscopic mixing effect of axial fluid is the best,with the decrease of boundary gap,the peak value of the total velocity of the tank wall increases,indicating that the anti-adhesion effect is enhanced and the thermal boundary layer on the inside of the tank wall is thinned.

关 键 词：螺带式搅拌器 搅拌特性 模拟 结构优化 能量分配 

分 类 号：S817.124[农业科学—畜牧学]