大型发酵机多层搅拌流固耦合仿真分析

基于有限元法对流固耦合作用下的刀具转速开展搅拌效果及受力变形分析。在流体动力学分析中，采用示踪剂浓度法、多重参考系法研究转速对搅拌效果的影响。将静力学和动力学模块进行连接搭建，研究不同转速下的刀具受力变形情况，获得搅拌叶片的安全转速取值范围。结果表明：在达到临界转速前，所需混合时间对转速的变化敏感，搅拌桨的受力和变形也随转速的增加而增大；从流场、混合时间、应力和应变的角度综合考虑，搅拌转速设置为200 r/min时综合指标更高。

Fluid-solid coupling simulation analysis of multi-layer stirring in large-scale fermentation machine

Based on the finite element method, the influence of cutter speed on stirring effect and stress deformation under fluid-solid coupling was analyzed. In the hydrodynamics analysis, the tracer concentration method and multiple reference frame method were used to study the influence of rotating speed on the mixing effect. Then the static and dynamic modules were connected to study the force and deformation of the tool at different speeds, and the safe speed range of the mixing blade was obtained. Results show that before reaching the critical speed, the mixing time is sensitive to the change of speed, and the force and deformation of the impeller also increase with it. Considering the flow field, mixing time, stress and strain, the comprehensive index is higher when the mixing speed is set as 200 r/min.