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Journal of Mechanical Science and Technology

, Volume 33, Issue 1, pp 269–278 | Cite as

Instability analysis under part-load conditions in centrifugal pump

  • Weixiang Ye
  • Renfang Huang
  • Zhiwu Jiang
  • Xiaojun Li
  • Zuchao Zhu
  • Xianwu LuoEmail author
Article
  • 7 Downloads

Abstract

In this study, a centrifugal pump with a specific speed of 39.12 m×min-1×m3s-1 is treated to analyze the flow instability under part-load conditions by numerical simulation and experimental test. For calculations, the RANS method, coupled with the k-ω SST turbulence model, is adopted. Numerical results at different operation points are compared with available experimental data, such as hydraulic performance and flow field information by particle image velocimetry. The numerical and experiment results agree well. The flow simulation indicates a strong reverse flow at the passage upstream impeller inlet, and the energy loss in the impeller is the largest under part-load conditions among all flow components in the pump. In one impeller revolution, one blade-to-blade flow passage is always nearly blocked off by the rotating stall occurring at the impeller inlet for each instant, and the blockage induces a jet flow with large velocity at the next blade-to-blade flow passage along the rotational direction of the impeller. The blockage and the jet flow in the blade-to-blade flow passages will make the flow unstable inside the impeller and cause performance breakdown and pressure vibration under part-load conditions for the pump.

Keywords

Centrifugal pump Flow instability Part-load conditions Rotating stall 

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References

  1. [1]
    J. Y. Mao, S. Q. Yuan, J. F. Zhang, Y. L. Li and Y. F. Wang, Analysis of inner flow characteristics in low specific speed centrifugal pump around hump conditions, Journal of Drainage and Irrigation Machinery Engineering (JDIME), 33 (4) (2015) 283–289.Google Scholar
  2. [2]
    Y. X. Xiao, Y. Y. Yao, Z. W. Wang, J. Zhang, Y. Y. Luo, C. J. Zeng and W. Zhu, Hydrodynamic mechanism analysis of the pump hump district for a pump-turbine, Engineering Computations, 33 (3) (2016) 957–976.CrossRefGoogle Scholar
  3. [3]
    Y. Ren, Z. C. Zhu, D. H. Wu, J. G. Mu and X. J. Li, An improved turbulence model for separation flow in a centrifugal pump, Advances in Mechanical Engineering, 8 (6) (2016) 1–10.CrossRefGoogle Scholar
  4. [4]
    H. J. Ran, X. W. Luo, L. Zhu, Y. Zhang, X. Wang and H. Y. Xu, Experimental study of the pressure fluctuations in a pump turbine at large partial flow conditions, Chinese Journal of Mechanical Engineering, 25 (6) (2012) 1205–1209.CrossRefGoogle Scholar
  5. [5]
    J. G. Mou, S. C. Zhang, S. H. Zheng and H. Y. Deng, Reason for centrifugal pump performance curve hump and the elimination method, Transactions of the Chinese Society of Agricultural Machinery, 37 (4) (2006) 56–59.Google Scholar
  6. [6]
    O. Braun, Part-load flow in radial centrifugal pumps, Lausanne: Ecole polytechnique fédérale de Lausanne (Epfl) (2009).Google Scholar
  7. [7]
    G. Wuibaut, G. Bois, P. Dupont, G. Caignaert and M. Stanislas, PIV measurements in the impeller and the vaneless diffuser of a radial flow pump in design and off-design operating conditions, Journal of Fluids Engineering, 124 (3) (2002) 791–797.CrossRefGoogle Scholar
  8. [8]
    A. Guedes, J. L. Kueny, G. D. Ciocan and F. Avellan, Unsteady rotor-stator analysis of hydraulic pump-turbine: CFD and experimental approach, Proceedings of 21st IAHR Symposium on Hydraulic Machinery and Systems, Lausanne, Sweden (2002).Google Scholar
  9. [9]
    M. Sinha, A. Pinarbasi and J. Katz, The flow structure during onset and developed states of rotating stall within a vaned diffuser of a centrifugal pump, Journal of Fluids Engineering, 123 (3) (2001) 490–499.CrossRefGoogle Scholar
  10. [10]
    Y. Li, X. J. Li, Z. C. Zhu and F. Q. Li, Investigation of unsteady flow in a centrifugal pump at low flow rate, Advances in Mechanical Engineering, 8 (12) (2016) 1–8.Google Scholar
  11. [11]
    S. Bolpaire and J. P. Barrand, Experimental study of the flow in the suction pipe of a centrifugal pump at partial flowrates in unsteady conditions, Journal of Pressure Vessel Technology, 121 (3) (1999) 291–295.CrossRefGoogle Scholar
  12. [12]
    C. Widmer, T. Staubli and N. Ledergerber, Unstable characteristics and rotating stall in turbine brake operation of pump-turbine, Journal of Fluids Engineering, 133 (4) (2011) 041101.CrossRefGoogle Scholar
  13. [13]
    E. Outa, Rotating stall and stall-controlled performance of a single stage subsonic axial compressor, Journal of Thermal Science, 15 (1) (2006) 1–13.CrossRefGoogle Scholar
  14. [14]
    S. Berten, P. Dupont, L. Fabre, M. Kayal, F. Avellan and M. Farhat, Experimental investigation of flow instabilities and rotating stall in a high energy centrifugal pump stage, Proceedings of ASME 2009 Fluids Engineering Division Summer Meetings, Vail, Colorado, USA (2009) 78562.Google Scholar
  15. [15]
    G. X. Gu, A. Sparks and S. S. Banda, An overview of rotating stall and surge control for axial flow compressors, IEEE Transactions on Control Systems Technology, 7 (6) (1999) 639–647.CrossRefGoogle Scholar
  16. [16]
    G. D. Ciocan and J. L. Kueny, Experimental analysis of rotor-stator interaction in a pump-turbine, Proceedings of 23th IAHR Symposium on Hydraulic Machinery and Systems, Yokohama, Japan (2006) 216–226.Google Scholar
  17. [17]
    D. K. Walters and D. Cokljat, A three-equation eddyviscosity model for Reynolds-averaged Navier-Stokes simulations of transitional flow, Journal of Fluids Engineering, 130 (12) (2008) 121401.Google Scholar
  18. [18]
    R. K. Byskov, C. B. Jacobsen and N. Pedersen, Flow in a centrifugal pump impeller at design and off-design conditions-Part II: Large Eddy simulations, Journal of Fluids Engineering, 125 (1) (2003) 73–83.CrossRefGoogle Scholar
  19. [19]
    P. J. Zhou, F. J. Wang, Z. J. Yang and J. G. Mou, Investigation of rotating stall for a centrifugal pump impeller using various SGS models, Journal of Hydrodynamics, 29 (2) (2017) 235–242.CrossRefGoogle Scholar
  20. [20]
    H. Le, P. Moin and J. Kim, Direct numerical simulation of turbulent flow over a backward-facing step, Journal of Fluid Mechanics, 330 (1) (1997) 349–374.CrossRefzbMATHGoogle Scholar
  21. [21]
    X. W. Luo, Y. Zhang, J. Q. Peng, H. Y. Xu and W. P. Yu, Impeller inlet geometry effect on performance improvement for centrifugal pumps, Journal of Mechanical Science and Technology, 22 (10) (2008) 1971–1976.CrossRefGoogle Scholar
  22. [22]
    P. J. Zhou, F. J. Wang and J. G. Mou, Investigation of rotating stall characteristics in a centrifugal pump impeller at low flow rates, Engineering Computations, 34 (6) (2017) 1989–2000.CrossRefGoogle Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Weixiang Ye
    • 1
  • Renfang Huang
    • 2
  • Zhiwu Jiang
    • 3
  • Xiaojun Li
    • 3
  • Zuchao Zhu
    • 3
  • Xianwu Luo
    • 1
    Email author
  1. 1.State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power EngineeringTsinghua UniversityBeijingChina
  2. 2.Key Laboratory for Mechanics in Fluid Solid Coupling System, Institute of MechanicsChinese Academy of SciencesBeijingChina
  3. 3.Key Laboratory of Fluid Transmission Technology of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhouChina

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