International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Volute Throat Enlargement and Fluid Viscosity on the Performance of an Over Hung Centrifugal Pump

  • Khoeini, Davood (Department of Mechanical Engineering, Isfahan University of Technology) ;
  • Riasi, Alireza (Department of Mechanical Engineering, Tehran University) ;
  • Shahmoradi, Ali (Department of Mechanical Engineering, Isfahan University of Technology)
  • Received : 2016.01.15
  • Accepted : 2016.11.15
  • Published : 2017.03.31
⟨ Previous Next ⟩

Abstract

In the current study, identifying regimes and behaviors of the various viscous fluids in a typical horizontal single-stage centrifugal pump and improving its performance by enhancing volute throat area have been surveyed numerically and experimentally. Indeed the initial pump had insufficient head at BEP (Best Efficient Point) in relevant applications. In order to solve this problem, the method of increasing the volute throat area on the prototype was used in steps and eventually the increased head values have been achieved. Then modified centrifugal pump, that has been constructed based on the modified control volume from numerical results, has been tested thoroughly. The maximum head and efficiency discrepancy between numerical and experimental results in BEP were 1.4 and 2.6% respectively. The effects of viscous fluids, from 1 cSt to 500 cSt, on the performance curves of centrifugal pump have been investigated as well and results showed that viscous fluids has significant effect on them. Indeed the highest head and efficiency in the same conditions at BEP has been obtained in viscosity 1 cst which was by 19.2% and 44% greater than the viscosity 500 cSt. It is also found that the highest viscous fluid had the highest energy consumption as the absorbed power of highest viscous fluid, 500 cSt, increased up to approximately 55% above the lowest viscous fluid, 1 cSt, values.

Keywords

References

  1. Wang, H. and Tsukamoto, H., 2001, "Fundamental Analysis on Rotor-Stator Interaction in a Diffuser Pump by Vortex Method," Journal of Fluids Engineering, Vol. 123(4), 737-747. https://doi.org/10.1115/1.1413242
  2. Dauherty, R.L., 1926, "A further investigation of performance of centrifugal pump when pumping oils," Bulletin 130. Gould Pumps.
  3. Stepanoff, A.J., 1964, Pumping viscous oils which centrifugal pumps. 2nd Edition, John Wiley and Sons inc., New York.
  4. Stoffel, B. 1980, Tests on centrifugal pumps for handling viscous liquids. Institute of Chemical Engineering's; paper no. 3.
  5. Li W.G, Hu Z.M., 1997, "An experimental study on performance of centrifugal oil pump," Fluids Mach., 25(2):3-7.
  6. Li WG, Deng D.L., 1999, "Reynolds number of centrifugal oil pumps and its effects on the performance," Pump Technol. (3):10-3.
  7. Li W.G. 2000., "Effects of viscosity of fluids on centrifugal pump performance and flow pattern in the impeller," Int. J. Heat Fluid Flow, (21):207-12.
  8. Bellary, S.A.I and Samad, A., 2015, "Numerical Analysis of Centrifugal Impeller for Different Viscous Liquids," International Journal of Fluid Machinery and Systems, Vol. 8, No. 1. 36-45. https://doi.org/10.5293/IJFMS.2015.8.1.036
  9. Anagnostopoulos, J.S. 2009, "A fast numerical method for flow analysis and blade design in centrifugal pump impellers," Comput Fluids; 38:284-9. https://doi.org/10.1016/j.compfluid.2008.02.010
  10. Singh, G. and Mitchell, J.W., 1998, "Energy savings from pump impeller trimming," ASHRAE Journal, 40 (4) 60-63.
  11. Kergourlay, G., Younsi, M., Bakir, F., Rey, R., 2007., "Influence of splitter blades on the flow field of a centrifugal pump: test-analysis comparison," International Journal of Rotating Machinery, Issue 1, Special section p1.
  12. Shigemitsu, T., Fukutomi, J., Kaji, K., 2011, "Influence of Blade Outlet Angle and Blade Thickness on Performance and Internal Flow Conditions of Mini Centrifugal Pump," International Journal of Fluid Machinery and Systems. Vol. 4, No. 3, 317­-323. https://doi.org/10.5293/IJFMS.2011.4.3.317
  13. Shojaeefard, M.H., Tahani, M., Ehghaghi, M.B., Fallahian, M.A., Beglari, M., 2012, "Numerical study of the effects of some geometric characteristics of a centrifugal pump impeller that pumps a viscous fluid," Computers & Fluids. 60, 61-70. https://doi.org/10.1016/j.compfluid.2012.02.028
  14. Kim, S., Choi, Y.S., Lee, K.Y., Yoon, J.Y., 2009, "Design optimization of centrifugal pump impellers in a fixed meridional geometry using DOF," International Journal of Fluid Machinery and Systems, Vol. 2, No. 2, 172-178. https://doi.org/10.5293/IJFMS.2009.2.2.172
  15. Song, P., Zhang, Y., Xu, C., Zhou, X., Zhang, J., 2015, "Numerical studies on cavitation behavior in impeller of centrifugal pump with different blade profiles," International Journal of Fluid Machinery and Systems, Vol. 8, No. 2, 94-101. https://doi.org/10.5293/IJFMS.2015.8.2.094
  16. Pagalthivarthi, K.V., Gupta, P.K., Tyagi, V., Ravi, M.R., 2011, "CFD Predictions of Dense Slurry Flow in Centrifugal Pump Casings," International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, Vol:5, No:3.
  17. Kelder J.D.H., Dijkers R.J.H., Esch B.P.M., Kruyt N.P., 2001., "Experimental and theoretical study of the flow in the volute of a low specific-speed pump," Fluid Dynamics Research, Vol. 28(4), 267-280. https://doi.org/10.1016/S0169-5983(00)00032-0
  18. Sato, S. and Furukawa, A., 2010., "Air-Water Two-Phase Flow Performances of Centrifugal Pump with Movable Bladed Impeller and Effects of Installing Diffuser Vanes," International Journal of Fluid Machinery and Systems, Vol. 3, No. 3, 245­-252. https://doi.org/10.5293/IJFMS.2010.3.3.245
  19. Barrio, R., Fernandez, J., Blanco, E., Parrondo, J., 2011, "Estimation of radial load in centrifugal pumps using computational fluid dynamics," European Journal of Mechanics B/Fluids 30 316-324. https://doi.org/10.1016/j.euromechflu.2011.01.002
  20. Nishi, Y., Fukutomi, J., Fujiwara, R., 2011, "Radial Thrust of Single-Blade Centrifugal Pump," International Journal of Fluid Machinery and Systems, Vol. 4, No. 4, 239-247.
  21. Zhang, M., and Tsukamoto, H., 2005, "Unsteady Hydrodynamic Forces due to Rotor-Stator Interaction on a Diffuser Pump with Identical Number of Vanes on the Impeller and Diffuser," ASME Transactions, Journal of Fluids Engineering, Vol. 127, 743-751. https://doi.org/10.1115/1.1949640
  22. Gonzalez, J., Fernandez, E., Blanco, E., Santolaria, C., 2002, "Numerical simulation of the dynamic effects due to impeller- volute interaction in a centrifugal pump," ASME Journal of Fluids Engineering, Vol. 124(2), 348-355. https://doi.org/10.1115/1.1457452
  23. Wang, Y., Liu, H., Liu, D., Yuan, S., Wang, J., Jiang, L., 2016, "Application of the two-phase three-component computational model to predict cavitating flow in a centrifugal pump and its validation," Computers & Fluids, Vol. 131, Pages 142-150 https://doi.org/10.1016/j.compfluid.2016.03.022
  24. Liu, H. L., Liu, D. X., Wang, Y., Wu, X. F., Wang, J., Du, H., 2013, "Experimental investigation and numerical analysis of unsteady attached sheet cavitating flows in a centrifugal pump," Journal of Hydrodynamics, Ser. B, Vol. 25, Issue 3, 370-378 https://doi.org/10.1016/S1001-6058(11)60375-3
  25. Kobayashi, K. and Chiba, Y., 2010, "Computational fluid dynamics of cavitating flow in mixed flow pump with closed type impeller," International Journal of Fluid Machinery and Systems, Vol. 3, No. 2, 113-121. https://doi.org/10.5293/IJFMS.2010.3.2.113
  26. Yamamoto, K. and Tsujimoto, Y., 2009, "A Backflow Vortex Cavitation and Its Effects on Cavitation Instabilities," International Journal of Fluid Machinery and Systems, Vol. 2, No. 1, 40-54. https://doi.org/10.5293/IJFMS.2009.2.1.040
  27. Kang, D., Yonezawa, K., Horiguchi, H., Kawata, Y., Tsujimoto, Y., 2009, "Cause of cavitation instabilities in three dimensional inducer," International Journal of Fluid Machinery and Systems, Vol. 2, No. 3, 206-214. https://doi.org/10.5293/IJFMS.2009.2.3.206
  28. Kang, D., Watanabe, T., Yonezawa, K., Horiguchi, H., 2009, Yutaka Kawata, Yoshinobu Tsujimoto, "Inducer design to avoid cavitation instabilities," International Journal of Fluid Machinery and Systems, Vol. 2, No. 4, 439-448. https://doi.org/10.5293/IJFMS.2009.2.4.439
  29. Kim, J. H, Ishzaka, K., Watanabe, S., Furukawa, A., 2010, "Cavitation surge suppression of pump inducer with axi-asymmetrical inlet plate," International Journal of Fluid Machinery and Systems, Vol. 3, No. 1, 50-57. https://doi.org/10.5293/IJFMS.2010.3.1.050
  30. Lobanoff, V.S., Ross, R.R., 1992., "Centrifugal pumps: design and application," Gulf Professional Publishing, Huston.
  31. Karassik, I.J., Messina, J.P., Cooper, P., Heald, C.C., 2004., "Pump Handbook," McGraw.
  32. API standard 610, 2004., "Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries," 10th ed.
  33. ISO recommendation R 781, 1968., "measurement of fluid flow by means tubes," 1st ed.
  34. Moffat, R.J., 1982, "Contributions to the theory of single-sample uncertainty," ASME Journal of Fluids and Engineering; 104:250e60. https://doi.org/10.1115/1.3241818
  35. Menter, F.R., 1994, Two-equation eddy-viscosity turbulence models for engineering applications. AIAA J; 32:1598-605. https://doi.org/10.2514/3.12149
  36. American National Standard for Centrifugal Pumps for Design and Application, ANSI/HI 1.3-2000, Section 1.3.4.1.11.

Cited by

  1. Flow characteristics of a centrifugal pump with different impeller trimming methods vol.46, pp.4, 2018, https://doi.org/10.5937/fmet1804463K
  2. Improvement of Centrifugal Pump Performance by Using Different Impeller Diffuser Angles With and Without Vanes pp.1811-8216, 2018, https://doi.org/10.1017/jmech.2018.39
  3. The optimum position of impeller splitter blades of a centrifugal pump equipped with vaned diffuser vol.46, pp.3, 2018, https://doi.org/10.5937/fmet1802205K