Study on unsteady flow characteristics of solid-liquid two-phase centrifugal pump

XIANG Jia-liang，LI Yi，TANG Hua

（The Province Key Laboratory of Fluid Transmission Technology，Zhejiang Sci-Tech University，Hangzhou 310018，China）

Abstract：In order to study the unsteady flow characteristics of solid-liquid two-phase pump，sliding grid technique，the RNG κ-ε turbulence model and Algebraic slip mixture model were used to simulate the unsteady turbulent flow field in a high specific speed solidliquid two-phase centrifugal pump. The numerical calculation results and external characteristics results of single-phase water were compared. And the unsteady flow analysis was carried on for the solid-liquid two-phase mixture transportation. The results indicate that pump head，efficiency and shaft power show a sine wave features in a run cycle. The velocity and static pressure distributions at the outlet of impeller show cyclical fluctuations because of stator interaction effects. The wear of impeller is serious than that of the volute wall. In conclusion，these rules provide high specific speed solid-liquid two-phase centrifugal pump reference to achieve hydraulic design optimization and wear reduce.