离心泵叶轮输送固相颗粒的数值模拟研究

Numerical Simulation on Solid Phase Particle Transport in Centrifugal Pump Impellers

为了研究不同固相体积浓度条件下固液两相流离心泵内流场的流动规律。应用Fluent软件对离心泵叶片流道进行流场模拟,在多重参考系坐标下,采用有限体积法对雷诺时均N-S方程进行离散,选用标准的k-ε湍流模型和SIMPLEC算法进行求解,分别得出在不同固相体积浓度时叶片流道内固相浓度、速度和压力分布规律,对其进行分析和比较。模拟结果表明:在叶片的非工作面和入口处浓度差较大,造成流动效果降低;叶轮内部速度随着固相浓度的变化基本保持不变;叶片进出口总压差随着固相体积浓度的增加而增大。所得结论对于指导实际应用和为两相流离心泵的优化设计提供参考。

To study the flow pattern of solid-fluid phase in the centrifugal pump under different solid-phase volume concentra- tions, we used the software Fluent to simulate the blade flow passageway of centrifugal pumps. Under different reference system coordinates, we applied the limited volume method to disperse Renault time-averaged N-S equation, chose the standard k-ε turbulent flow model and SIMPLEC algorithm, and obtained the solid phase concentration, velocity and pressure distribution, to analyze and compare them. The simulation result indicated that the concentration difference is greater at the back and the inlet of blade, which reduces the flow effect;the velocity in the impeller is steady with the change of solid-phase concentration; the total pressure increases with the solid-phase volume concentration increasing. This conclusion could provide a reference for the practical application and optimizing design of two-phase flow centrifugal pumps.