改进型INTER-MIG桨种分槽内混合过程的实验研究及大涡模拟  

Experimental Study and Large Eddy Simulation of Mixing in a Seed Precipitation Tank with Improved INTER-MIG Impeller

作　　者：卢源[1] 周勇军[1] 梁家勇[1] 张维蒙 

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

出　　处：《过程工程学报》2015年第1期29-34,共6页The Chinese Journal of Process Engineering

摘　　要：采用褪色实验法和数值模拟相结合的方法对双层改进型INTER-MIG桨种分槽内的混合过程进行研究,用高速相机记录实验中种分槽内的混合过程,结合大涡模型(LES)及动态Smagorinsky–Lilly模式亚格子模型求解湍流流动及示踪剂传递过程.结果表明,在近液面处加料时LES预测的混合过程与实验吻合,示踪剂呈螺旋状扩散,但预测的混合时间偏大;最佳加料点位于下层桨叶附近区域,其混合效率比在近液面处加料高17.16%;槽体中部区域监测到的混合时间最小,并分别向槽顶和槽底方向增大;改进型INTER-MIG桨种分槽槽底区域是混合困难区域.The mixing process in a seed precipitation tank with double improved INTER-MIG impellers was studied by experiment of achromatic method and numerical simulation. The change of mixing process was recorded by a high speed camera. The tracer transfer process and turbulent flow field were calculated by large eddy simulation（LES） and dynamic Smagorinsky–Lilly model subgrid scale model. The results showed that the mixing process predicted by LES was consistent with the experiment when the tracer was added to the liquid surface, and it dispersed in spiral form, but the predicted mixing time was longer. The optimal injection point was located in the region near lower impeller, its mixing efficiency was higher than that at the liquid surface by 17.16%. The mixing time monitored in the central region of the tank was smaller than that at the top and bottom positions. The difficult mixing part was located in the bottom region of seed precipitation tank with improved INTER-MIG impeller.

关 键 词：改进型INTER-MIG桨 种分槽 褪色法 大涡模拟 混合时间 

分 类 号：TQ027.1[化学工程]