Liquid-Solid Two Phase Flow in a Centrifugal Pump

固液两相流泵在我国工业领域应用广泛。对泵叶轮内固液流动现象进行了大量的研究。然而，关于流动结构与泵性能之间的关系，还没有足够的信息。本课题旨在通过实验研究和理论研究，厘清流动现象，建立性能预测方法。实验研究在九州工业大学进行。清华大学负责理论研究。在九州工业大学，对不同体积颗粒浓度、直径和密度的浆体泵叶轮进行了压力波动测量和流动显示。采用锁相平均法测量了泥浆泵开式叶轮内的压降分布和压力波动分布。此外，利用CCD相机和图像处理技术观察到颗粒浓度的不均匀分布。通过实验数据，明确了压力分布和泵性能随流量的关系。在清华大学，采用数值流动分析方法研究了离心泵叶轮内的流动形态。计算得到的压力分布与相应的实验数据进行了比较。结果与实测值吻合良好。

Solid-liquid two phase flow pumps are widely used in Chinese industrial field. Many research on flow phenomena of solid and liquid in a pump impeller were carried out. There, however, has not been enough information on the relations of flow structure to pump performance. This research project was planned to make clear the flow phenomena and to establish the method of performance prediction by experimental and theoretical research. The experimental research was made at Kyushu Institute of Technology. Thinghua University took charge of theoreticalresearch.In Kyushu Institute of Technology, pressure fluctuation measurement and flow visualization in a slurry pump impeller were carried out for variety of volumetric particle concentration, diameter and density. The pressure drop distribution and pressure fluctuation distribution were measured in an open impeller of slurry pump using phase-lock-averaging technique. Moreover, a nonuniform distribution of particle concentration was observed by use of CCD camera and picture processing technique. As a result of the present study, the relationship between pressure distribution and pump performance with flow rate were made clear from the experimental data.In Thinghua University, the flow patterns in a centrifugal pump impeller was investigated by numerical flow analysis. The calculated pressure distribution was compared with the corresponding experimental data. and showed good agreement with measured one.