穿流-四斜叶组合桨桨间距对搅拌槽内流场特性的影响
Effect of Impeller Pitch on the Flow Characteristics of Punched and Four-bladed Combination Impellers in a Stirred Tank
徐阳 1杨其洲 1潘跃跃 1周勇军1
作者信息
- 1. 南京工业大学 机械与动力工程学院,江苏 南京 211816
- 折叠
摘要
基于计算流体力学中的大涡模拟方法,对不同桨间距C2 下的穿流-四斜叶组合桨搅拌槽内的流动特性进行了模拟分析,并采用粒子成像测速技术进行了实验对比研究.研究结果表明,桨间距对两桨叶之间的连接流作用及整体混合效果的影响较大.C2=0.24H(H为搅拌槽高度)时两桨叶之间的连接流较为稳定,但搅拌槽上层区域流动较差;当C2 增大到0.29H 时,搅拌槽内两搅拌桨间的连接流呈现S型,整体的混合能力更强;当C2 增大到0.34H时,两桨叶间的连接流能力减弱,且搅拌槽内的流型依据搅拌桨位置分化为上下2 个较大的局部混合区域.
Abstract
Based on the large eddy simulation method in computational fluid dynamics,the flow characteristics in a stirred tank with the punched and four-bladed combination impellers at different impeller pitches C2 were simulated and analyzed,and the simulation results were compared with particle image velocimetry experiments.The research results show that the impeller pitch has a significant effect on the connecting flow between two blades and the overall mixing effect.When C2=0.24H(H is the height of the stirred tank),the connecting flow between the two blades is relatively stable,but the flow in the upper part of the stirred tank is poor.When the impeller pitch increases to C2=0.29H,the connecting flow between the two impellers in the stirred tank forms a S-shape and the mixing ability of the liquid is stronger.As the impeller pitch increases to C2=0.34H,the connecting flow between the two impellers is weak and the flow pattern inside the stirred tank is divided into two large local mixing regions based on the position of the impellers.
关键词
搅拌槽/组合桨/流场/计算流体力学Key words
stirred tank/combination impeller/flow field/computationation fluid dynamics引用本文复制引用
出版年
2024
NETL
NSTL
万方数据