International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Numerical Prediction of Inlet Recirculation in Pumps

  • Received : 2016.04.19
  • Accepted : 2016.06.02
  • Published : 2016.09.30
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Abstract

The development of heavy-duty process pumps, usually based on various design criteria, depends on the pump's application. The most important criteria are Q-H, efficiency and NPSH characteristics. Cavitation due to inlet recirculation is not often one of the design criteria, although many problems in pump operation appear because of inlet recirculation, when the operation range is from 0.5-0.8 $Q_{opt}$. The present paper shows that steady state CFD analysis of inlet recirculation can give quite good results for the design of new hydraulic shapes, which have been developed to expand operating range and to minimize the harmful influence of recirculation at part load. In this paper, the structures of inlet recirculation are presented, as well as detailed shapes of vortices between the blades for various operating regimes, axial velocity distribution at the impeller inlet, the experimental results of NPSH and efficiency characteristics of an existing and newly designed pump.

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References

  1. Florjancic, Trouble-shooting Handbook for Centrifugal Pumps, Turboinstitut, Ljubljana, 2008.
  2. Dusko Mitrusevski, Cavitation due to recirculation - important criteria for design of heavy-duty process pumps, 6th IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, Ljubljana, 2015.
  3. Allan R. Budris, How to avoid damage from internal 'suction recirculation', WaterWorld Magazin.
  4. Wang, L., Li, F.C., Dong, Y., Cai, W.H., Su, W.T., Study of the Performance characteristics of Centrifugal Pump with Drag-reducting Surfactant Additives, International Journal of Fluid Machinery and Systems, Vol. 4, No. 2, April-June 2011, 223-228. https://doi.org/10.5293/IJFMS.2011.4.2.223
  5. Song, P., Zhang, Y., Xu, C., Zhou, X., Zhang, J., Numerical Studies on Cavitation Behaviour in Impeller, of Centrifugal Pump with Diffrernt Blade Profiles, International Journal of Fluid Machinery and Systems, Vol. 8, No. 2, April-June 2015, 94-100. https://doi.org/10.5293/IJFMS.2015.8.2.094
  6. Sedlar, M., Sputa, O., Komarek, M., CFD Analysis of Cavitation Phenomena in Mixed-Flow Pump, International Journal of Fluid Machinery and Systems, Vol. 5, No. 1, January-March 2012, 18-29. https://doi.org/10.5293/IJFMS.2012.5.1.018
  7. Hatano, S., Kang, D., Kagawa, S., Nohmi, M., Yokota, K., Study of Cavitation Instabilities in Double-Suction Centrifugal Pump, International Journal of Fluid Machinery and Systems, Vol. 7, No. 3, July-September 2014, 94-100. https://doi.org/10.5293/IJFMS.2014.7.3.094
  8. Kobayashi, K., Chiba, Y., Computational Fluid Dynamics of Cavitating Flow in Mixex Flow Pump with Closed Type Impeller, International Journal of Fluid Machinery and Systems, Vol. 3, No. 2, April-June 2010, 113-121. https://doi.org/10.5293/IJFMS.2010.3.2.113
  9. SM Pumps - Internal report 23/2012.
  10. Cheah, K.W., Lee, T.S., Winoto, S.H., Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump, International Journal of Fluid Machinery and Systems, Vol. 4, No. 3, July-September 2011, 349-359. https://doi.org/10.5293/IJFMS.2011.4.3.349
  11. Skerlavaj, Aljaz, Titzshkau, M., Pavlin, Rok, Vehar, Franci, Meznar, Peter, Lipej, Andrej. Cavitation improvement of double suction centrifugal pump HPP Fuhren. Proceedings of the 26th IAHR Symposium on Hydraulic Machinery and Systems, 19-23 August 2012, Beijing, China, (IOP Conference Series, ISSN 1755-1315, vol. 15, part 2, 2012). London: Institute of Physics, 2012.
  12. ANSYS CFX Solver Theory Guide, ANSYS, Inc., Southpointe, 2600 Ansys Drive, Canonsburg, PA, Release 17.0, January 2016.