基于流固耦合的错位桨搅拌假塑性流体特性分析

Analysis on Flow Characteristics of Pseudoplastic Fluid Stirred by Impeller of Perturbed Six-bent-bladed Turbine based on Fluid-structure Interaction

基于ANSYS Workbench分析平台,采用双向流固耦合的计算方法,模拟计算了错位六弯叶桨(6PBT)搅拌假塑性流体的流动特性。对比分析了不同转速下黄原胶水溶液的速度分布以及桨叶的变形和等效应力分布情况,结果表明:搅拌转速对假塑性流体的速度场有较大影响,特别是在较高雷诺数下,转速由60rpm增加到180rpm时,最大变形量降低了75%,最大应力降低了49%。因此在搅拌较高质量浓度的假塑性流体时,适当的提高转速有助于流体的流动和混合,这可为实际生产操作提供理论参考。

The flow characteristics of pseudoplastic fluid stirred with impeller of perturbed six-bent- bladed turbine (6PBT) were simulated by bidirectional fluid-structure interaction (FSI) method based on simulation platform ANSYS Workbench.The velocity distribution of xanthan gum solution,as well as the total deformation and equivalent stress distribution were made a contrastive analysis under different rotating speeds.Results show that impeller speed has a obvious effect on the velocity field of the pseudoplastic fluid, especially at high Reynolds numbers.When the rotational speed increased from 60 rpm to 180 rpm,the maximum deformation reduced by 75 %,and the maximum stress reduced by 49 %.Therefore,for the mixing medium to be a pseudoplastic fluid,the flow characteristics of the pseudoplastic fluid can be changed by increasing the impeller speed appropriately at the small rheological index,which can provide reference for actual production operation.