多级泵内固液两相流可视化试验测试

为研究多级泵内固液两相流规律,搭建了泵内固液两相流可视化测试系统,对清水工况下及输送不同物性参数颗粒时泵能量性能及颗粒运动规律进行了测试.测试结果表明:泵输送固液两相流时的扬程和效率相较于清水工况均有所降低,并且随着颗粒粒径和密度的增加,降幅逐渐增加;与输送清水相比,泵送球形颗粒时的扬程和效率最大分别低了0.32 m和2.92%.导叶流道内不同物性的球形颗粒均有向导叶工作面运动的趋势,且颗粒轨迹长度和颗粒进入导叶时的位置有关,颗粒进入导叶的位置越靠近导叶背面其运动轨迹越长;颗粒密度和粒径越小,颗粒在流体中的跟随性越好,其运动轨迹越光滑;在导叶进口区域,颗粒主要从导叶背面位置进入导叶流道,并且从该位置进入导叶内的颗粒比例随着颗粒粒径的增加逐渐降低,随着颗粒密度的增加先增加后降低.颗粒与导叶头部碰撞的概率随着粒径的增加逐渐增加,随着密度的增加逐渐降低.

Visualization test on solid-liquid two-phase flow in a multistage pump

In order to study the flow characteristics of the solid-liquid two-phase flow in a multistage pump, the energy performance test and high-speed photography test were carried out to test the energy performance and particle motion law of the pump. The test results show that the head and efficiency of the pump under the solid-liquid two-phase flow condition are lower than those at the corresponding water flow rate, and the maximum reduction are 0.32 m and 2.92%, respectively. With the increase of particle diameter and density, the influence on the energy performance of the pump is more significant. Particles with different physical properties in the guide vane passage have a tendency to the guide vane pressure side. When the particles enter the guide vane, the closer the position to the back of the guide vane, the longer the trajectory. With the decrease of particle density and diameter, the trajectory of particles in fluid becomes smoother. At the inlet region of the guide vane, particles mainly enter the guide vane passage from the back of the guide vane, and the proportion of particles entering the guide vane from this position gradually decreases with the increase of particle diameter, and first increases and then decreases with the increase of particle density. The probability of collision between particles and guide vane head increases with the increase of particle diameter, and decreases with the increase of particle density.