改进型框式组合桨内盘管搅拌釜内流场数值模拟  

Numerical Simulation of Flow Field of Improved Frame Type Combined Impeller in the Stirred Tank with Inner Coil

作　　者：秦晓波 包健[2] 高晓斌 周勇军[1] QIN Xiao-bo;BAO Jian;GAO Xiao-bin;ZHOU Yong-jun(College of Mechanical and Power Engineer,Nanjing Tech University,Nanjing 211816,China;Special Equipment Safety Supervision Inspection Institute of Jiangsu Province,Suzhou 215600,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816 [2]江苏省特种设备安全监督检验研究院,江苏苏州215600

出　　处：《石油化工设备》2023年第5期60-66,共7页Petro-Chemical Equipment

摘　　要：通过计算流体动力学软件对改进型框式组合桨在带内盘管搅拌釜内的流场进行了数值模拟,研究了在不同转速N、离底距C1下釜内的流场。研究结果表明,随着转速的增加,桨叶对内盘管的冲刷作用增强,内盘管附近的低速区会逐渐减小,促进了内盘管附近流体的混合;在C1=125 mm时,内盘管向下的导流作用明显,增加了搅拌釜底部壁面速度,有利于搅拌釜底部壁面附近流体的混合。将模拟得出的搅拌桨功率准数Np与实验结果进行对比,验证了数值模拟方法的准确性。研究结果可为类似改进型框式组合桨在带内盘管搅拌釜的结构优化提供参考。By using computational fluid dynamics software,the flow field of the improved frame type combined impeller in the stirred tank with inner coils was numerically simulated,and the effects on the flow field with the improved frame type combined propeller in a stirred tank with inner coils was investigated under the conditions of different rotating speed N and off-bottom height C1.The results show that with the increase in rotating speed,the erosion of the blade on the inner coil is enhanced,and the low-speed zone near the inner coil will reduce,which is conducive to the mixing of the fluid near the inner coil.When off-bottom height C1 is 125 mm,the downward flow guiding effect of the inner coil is obvious,which increases the velocity of the bottom wall of the stirred tank and is conducive to the mixing of the fluid near the bottom wall of the stirred tank.The reliability and accuracy of the numerial simulation is verified by comparison of the power factors Np of the impeller obtained from the experiment and simulation calculation.The conclusions will provide reference for similar structural optimization of improved frame type combined propeller in the stirred tank with the inner coil.

关 键 词：搅拌釜 内盘管 框式组合桨 流场 功率准数 

分 类 号：TQ050.2[化学工程]