| 姚晨明， 石秀东， 彭晶鑫.基于CFD的不同搅拌组合多相流流场研究[J].轻工机械,2021,39(4):20-5 |
| 基于CFD的不同搅拌组合多相流流场研究 |
| Research of Multiphase Flow Field with Different Stirring Combinations Based on CFD |
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| DOI：10.3969/j.issn.1005 2895.2021.04.005 |
| 中文关键词: 搅拌器 传质混合效果 计算流体力学 气液两相流 非稳态 |
| 英文关键词:stirrer mass transfer effect CFD (Computational Fluid Dynamics） gas liquid two phase flow unsteady state |
| 基金项目:江南大学江苏省食品先进制造装备技术重点实验室项目（FMZ201801）。 |
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| 中文摘要: |
| 针对在设计发酵搅拌设备过程中往往依赖经验判断传质混合效果以及能耗等的现状，课题组利用CFD技术对设计的4种搅拌模型进行气液两相流非稳态数值模拟。模拟采用了多面体网格划分物理模型以及滑移网格模型法求解，探究了其速度场、气相体积分数和功率耗损情况。结果表明：相同工况下，不同搅拌组合的流场特性差异较大；上桨采用径向流桨的搅拌组合形成的混合流场整体速度分布更均匀，能为釜内物质提供更佳的混合和传递效果；同时上桨和底桨采用6半圆叶圆盘涡轮桨的搅拌组合C气液分散性能更好；功耗方面，搅拌组合A>组合C>组合B>组合D。模拟结果及分析可为气液反应釜搅拌器的设计及优选提供重要的参考。 |
| 英文摘要: |
| In view of the current situation that the design of fermentation stirring equipment often relies on experience to judge the mass transfer mixing effect and energy consumption, the CFD technology was used to perform transient numerical simulations of gas liquid two phase flow on the four designed stirring models. The physical model of polyhedral mesh division and sliding mesh model were used to solve the problems and explore their velocity field, gas volume fraction and power consumption. The results show that under the same condition, the flow field characteristics under different stirring combinations are quite different. The overall velocity distribution of the mixed flow field formed by the mixing combination of the upper impeller and the radial flow impeller is more uniform, which can provide better mixing and transfer effect for the substances in the kettle. At the same time, the mixed flow combination C with six blade semicircular disk turbine blades for the upper blade and the bottom blade has better gas liquid dispersion performance. In terms of power consumption, mixing combination A>combination C>combination B>combination D. The simulation results and analysis can provide important reference for the design and optimization of the gas liquid reactor agitator. |
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