• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2018, Vol. 54 ›› Issue (24): 189-196.doi: 10.3901/JME.2018.24.189

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Research on Slip Phenomenon of Pumps as Turbines

WANG Xiaohui1,2, YANG Junhu1,2, GUO Yanlei1, XIA Zhengting1, MIAO Senchun1   

  1. 1. School of Energy and Power engineering, Lanzhou University of Technology, Lanzhou 730050;
    2. Key Laboratory of Fluid Machinery and System, Lanzhou 730050
  • Received:2017-12-20 Revised:2018-07-13 Online:2018-12-20 Published:2018-12-20

Abstract: Slip phenomenon is known to strongly influence the performance of pumps as turbines(PAT). In the present work, the standard k-ε model, RNG k-ε model, standard k-ω and SST k-ω model are adopted to simulate the hydraulic performance of PAT, and the experiment values are in a good agreement with CFD result by using RNG k-ε model. Therefore, the slip phenomenon in turbine impeller is studied and the slip factor is estimated for each PAT using RNG k-ε model. Then the slip phenomenon in turbine mode was compared with pump mode. It is observed that slip phenomenon occurs in PAT, and it lead to the head decrease, besides, the vortex flow is generated in PAT's flow passages near pressure side of blade. The slip factor varies with the specific speed of PAT, and its value is 0.2-0.4 approximately. In comparison with pump mode, the slip factor of turbine mode smaller than pump mode when the specific speed above 50, but larger when it below 50.

Key words: centrifugal pump, energy recovery, pumps as turbines, slip, slip factor

CLC Number: