渐变出口旋流器内部流场的数值模拟

Numerical Simulation of the Flow Field in a Hydrocyclone with Two Gradual Changing Exits

为了降低旋流器的能量消耗和提高流场的稳定性,设计了一种双渐扩出口旋流器,采用流体动力学(CFD)技术对新型旋流器进行了数值模拟,用RSM+VOF模型对流场进行数值分析,并将其试验结果与Hsieh经典数据进行对比,验证了数值模拟的正确性。模拟结果显示:单渐扩出口能使压力降、切向速度和轴向速度减小,双渐扩出口效果最明显,这使得旋流器能耗最低;改变底流口使得湍流黏度升高,这会增加涡流的产生,不利于流场稳定,溢流口渐扩可以降低湍流黏度,增大2个出口湍流黏度降低最明显,而且不随轴向位置发生变化,流场的稳定性大幅提高。研究结果为深入分析和探究旋流器提供了理论依据。

In order to reduce the energy consumption of the hydrocyclone and improve the stability of flow field,a hydrocyclone with double gradually expanding outlets was designed,the numerical simulation of the new hydrocyclone was carried out using CFD technology,and the numerical analysis of the convection field was carried out using RSM+VOF model.The experimental results were compared with the classic data of Hsieh,and the correctness of the numerical simulation was verified.The simulation results show that the diffuser with a single gradually expanding exit can reduce the pressure drop,tangential velocity and axial velocity,and the diffuser with double gradually expanding exits has the most obvious effect,which makes the energy consumption of the hydrocyclone lowest.Changing the underflow port makes the turbulent viscosity increased,which will increase the generation of eddy current,and not conducive to the stability of the flow field.Gradually expanding the overflow port can reduce the turbulent viscosity,and increasing the two exits can reduce turbulent viscosity most obviously,and the viscosity does not change with the axial position,so the stability of the flow field is greatly improved.The research results provide theoretical basis for further analysis and exploration of hydrocyclones.