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Journal of Visualization

, Volume 12, Issue 1, pp 65–72 | Cite as

Unsteady flow visualization at part-load conditions of a radial diffuser pump: by PIV and CFD

  • Feng J. 
  • Benra F. -K. 
  • Dohmen H. J. 
Regular Paper

Abstract

The present study provides flow visualization on complex internal flows in a radial diffuser pump under part-load conditions by using the three-dimensional Navier-Stokes code CFX-10 with Detached Eddy Simulation (DES) turbulence model. Particle Image Velocimetry (PIV) measurements have been conducted to validate numerical results. The CFD results show good agreements with experimental ones on both the phase-averaged velocity fields and turbulence field. The detailed flow analysis shows that no separation occurs at 0.75Qdes although a low-velocity zone develops on the rear impeller suction side. Steady flow separations are observed on the impeller suction sides at 0.5Qdes but with different onsets and amounts. When reducing the flow rate to 0.25Qdes, CFD predicts different types of back flows in the impeller region, including steady leading edge separations, rotating vortex in the impeller wake region, and back flow on the impeller pressure side.

Keywords

Flow visualization Radial pump PIV CFD Flow separation 

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References

  1. Akin, O. and Rockwell, D., Flow Structure in a Radial Flow Pumping System Using High-Image-Density Particle Image Velocimetry, ASME Journal of Fluids Engineering, 116 (1994), 538 -554.CrossRefGoogle Scholar
  2. Ardizzon, G. and Pavesi, G., Analysis of Unsteady Impeller Diffuser Interaction in a Centrifugal Pump, 22nd IAHR Symposium on Hydraulic Machinery and Systems, Stockholm, Sweden, June 29-July 2, 2004.Google Scholar
  3. Benra, F. -K. and Dohmen, H. J., Numerical Investigation of the Transient Flow in a Centrifugal Pump Stage, 2005 ASME Fluids Engineering Division Summer Meeting and Exhibition, Houston, TX, USA, June 19-23, 2005.Google Scholar
  4. Bert, P. F., Combes, J. F. and Kueny, J.L., Unsteady Flow Calculation in a Centrifugal Pump Using a Finite Element Method, XVIII IAHR Symposium on Hydraulic Machinery and Cavitation, Valencia, Spain, September 16–19, 1996.Google Scholar
  5. Feng, J., Benra, F. -K. and Dohmen, H. J., Qualitative Comparison of Unsteady Flow between Numerical and Experimental Results in a Radial Diffuser Pump, Journal of Visualization, 10 (2007), 349–357.Google Scholar
  6. Guleren, K.M. and Pinarbasi, A., Numerical Simulation of the Stalled Flow within a Vaned Centrifugal pump, Proceedings of the I MECH E Part C Journal of Mechanical Engineering Science, 218 (2004): 425–435.Google Scholar
  7. Japikse, D., Marscher, W. D. and Raymond, B. F., Centrifugal Pump Design and Performance, Concepts TTI Inc., 1997.Google Scholar
  8. He, L. and Sato, K., Numerical Solution of Incompressible Unsteady Flows in Turbomachinery, ASME Journal of Fluids Engineering, 123 (2001), 680–685.CrossRefGoogle Scholar
  9. Kim, J. S., Sung, J., Kim, S. and Kim, J. S., PIV Measurements on the Change of the Three-Dimensional Wake Structures by an Air Spoiler of a Road Vehicle, Journal of Visualization, 11 (2008), 45–54.CrossRefGoogle Scholar
  10. Krause, N., Zaehringer, K. and Pap, E., Time-Resolved Particle Imaging Velocimetry for the Investigation of Rotating Stall in a Radial Pump, Experiments in Fluids, 39 (2005), 192–201.CrossRefGoogle Scholar
  11. Pedersen, N., Larsen, P. S. and Jacobsen, C. B., Flow in a Centrifugal Pump Impeller at Design and off-Design Conditions-Part I: Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) Measurements, ASME Journal of Fluids Engineering, 125 (2003), 61–72.CrossRefGoogle Scholar
  12. Sano, T., Yoshida, Y. and Tsujimoto, Y., Numerical Study of Rotating Stall in a Pump Vaned Diffuser, ASME Journal of Fluids Engineering, 124 (2002), 363–370.CrossRefGoogle Scholar
  13. Sinha, M. and Katz, J., Quantitative Visualization of the Flow in a Centrifugal Pump with Diffuser Vanes, Part I: on Flow Structures and Turbulence, ASME Journal of Fluids Engineering, 122 (2000), 97–107.CrossRefGoogle Scholar
  14. Sinha, M., Pinarbasi, A. and Katz J., The Flow Structure During Onset and Developed States of Rotating Stall within a Vaned Diffuser of a Centrifugal Pump, Journal of Fluids Engineering, 123 (2001), 490–499.CrossRefGoogle Scholar
  15. Spalart, P. R., Jou, W.-H., Stretlets, M., and Allmaras, S. R., Comments on the Feasibility of LES for Wings and on the Hybrid RANS/LES Approach, the First AFOSR International Conference on DNS/LES, Ruston, LA, August 4–8, 1997.Google Scholar
  16. Ueda, Y., Hayashida, Y., Iguchi, M. and Ishii, T., Self-Induced Rotary Sloshing Caused by an Upward Round Jet in a Cylindrical Container, Journal of Visualization, 10 (2007), 317–324.CrossRefGoogle Scholar
  17. Wuibaut, G., Bois, G., Dupont, P., Caignaert, G., and Stanislas, M., PIV Measurements in the Impeller and the Vaneless Diffuser of a Radial Flow Pump in Design and off-Design Operating Conditions, ASME Journal of Fluids Engineering, 124 (2002), 791–797.CrossRefGoogle Scholar
  18. Wuibaut, G., Dupont, P., Caignaert, G., and Bois, G., Rotor Stator Interactions in a Vaned Diffuser Radial Flow Pump, 22nd IAHR Symposium on Hydraulic Machinery and Systems, Stockholm, Sweden, June 29- July 2, 2004.Google Scholar

Copyright information

© The Visualization Society of Japan 2009

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Faculty of EngineeringUniversity of Duisburg-EssenDuisburgGermany

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