Liquid-Solid Two Phase Flow in a Centrifugal Pump

固液两相流泵在我国工业领域中应用广泛。对泵叶轮内固液两相流动现象进行了大量的研究。然而，还没有足够的资料，流动结构的关系，泵的性能。本研究计划透过实验与理论研究，以厘清流动现象，并建立性能预测方法。实验研究是在九州工业大学进行的。清华大学承担了理论研究工作，九州工业大学在渣浆泵叶轮内进行了颗粒体积浓度、直径和密度变化时的压力脉动测量和流动显示。采用锁相平均技术测量了渣浆泵开式叶轮内的压力降分布和压力脉动分布。此外，利用CCD摄像机和图像处理技术观察到颗粒浓度的不均匀分布。通过对离心泵叶轮内部流场的数值分析，揭示了压力分布与泵性能随流量变化的关系。计算的压力分布与相应的实验数据进行了比较。并与实测值吻合良好。

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.