0
Research Papers: Flows in Complex Systems

Influence of the Blade Trailing Edge Profile on the Performance and Unsteady Pressure Pulsations in a Low Specific Speed Centrifugal Pump

[+] Author and Article Information
Bo Gao

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: gaobo@ujs.edu.cn

Ning Zhang

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: zhangningwlg@163.com

Zhong Li

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: lizhong@ujs.edu.cn

Dan Ni

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: nxm0424@163.com

MinGuan Yang

School of Energy and Power Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: mgyang@ujs.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 18, 2015; final manuscript received October 21, 2015; published online January 6, 2016. Assoc. Editor: Frank C. Visser.

J. Fluids Eng 138(5), 051106 (Jan 06, 2016) (10 pages) Paper No: FE-15-1336; doi: 10.1115/1.4031911 History: Received May 18, 2015; Revised October 21, 2015

The blade trailing edge profile is of crucial importance for the performance and pressure pulsations of centrifugal pumps. In the present study, numerical investigation is conducted to analyze the effect of the blade trailing edge profile influencing the performance and unsteady pressure pulsations in a low specific speed centrifugal pump. Five typical blade trailing edges are analyzed including original trailing edge (OTE), circle edge (CE), ellipse on pressure side (EPS), ellipse on suction side (ESS), and ellipse on both sides (EBS). Results show that the well-designed blade trailing edges, especially for the EPS and EBS profiles, can significantly improve the pump efficiency. Pressure amplitudes at fBPF and 2fBPF are together calculated to evaluate the influence of the blade trailing edge profile on pressure pulsations. The EPS and EBS profiles contribute obviously to pressure pulsations reduction. In contrast, the CE and ESS profiles lead to increase of pressure pulsation amplitude compared with the OTE pump. Vorticity distribution at the blade trailing edge demonstrates that the EPS and EBS profiles have an effective impact on reducing vortex intensity at the blade trailing edge. Consequently, rotor–stator interaction could be attenuated leading to lower pressure pulsation amplitude. It is thought to be the main reason of pressure pulsations reduction obtained with the proper modified blade trailing edges. The results would pave the way for further optimization of the blade trailing edge profile.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Brennen, C. E. , 1994, Hydrodynamics of Pumps, Concept ETI/Oxford University Press, Oxford, UK.
Rodriguez, C. G. , Mateos-Prieto, B. , and Egusquiza, E. , 2014, “ Monitoring of Rotor–Stator Interaction in a Pump-Turbine Using Vibration Measured With Onboard Sensors Rotating With Shaft,” Shock Vib., 2014, p. 276796.
Gao, Z. X. , Zhu, W. R. , Lu, L. , Deng, J. , Zhang, J. G. , and Wang, F. J. , 2014, “ Numerical and Experimental Study of Unsteady Flow in a Large Centrifugal Pump With Stay Vanes,” ASME J. Fluids Eng., 136(7), p. 071101. [CrossRef]
Bing, H. , and Cao, S. L. , 2014, “ Parametrization of Blade Leading and Trailing Edge Positions and Its Influence on Mixed-Flow Pump Performance,” Proc Inst. Mech. Eng. Part C, 228(4), pp. 703–714. [CrossRef]
Yao, Z. F. , Wang, F. J. , Qu, L. X. , Xiao, R. F. , He, C. L. , and Wang, M. , 2011, “ Experimental Investigation of Time–Frequency Characteristics of Pressure Fluctuations in a Double-Suction Centrifugal Pump,” ASME J. Fluids Eng., 133(10), p. 101303. [CrossRef]
Keller, J. , Blanco, E. , Barrio, R. , and Parrondo, J. , 2014, “ PIV Measurements of the Unsteady Flow Structures in a Volute Centrifugal Pump at a High Flow Rate,” Exp. Fluids, 55(10), pp. 1820–1823. [CrossRef]
Dwayne, A. B. , Steven, L. C. , and David, R. D. , 2005, “ Vortex Shedding From a Hydrofoil at High Reynolds Number,” J. Fluid Mech., 531, pp. 293–324. [CrossRef]
Zhu, B. S. , Lei, J. , and Cao, S. L. , 2007, “ Numerical Simulation of Vortex Shedding and Lock-In Characteristics for a Thin Cambered Blade,” ASME J. Fluids Eng., 129(10), pp. 1297–1305. [CrossRef]
Mosallem, M. M. , 2008, “ Numerical and Experimental Investigation of Beveled Trailing Edge Flow Fields,” J. Hydrodyn., 20(3), pp. 273–279. [CrossRef]
Heskestad, F. , and Olberts, D. R. , 1960, “ Influence of Trailing Edge Geometry on Hydraulic Turbine Blade Vibration,” ASME J. Eng. Power, 82(2), pp. 103–110. [CrossRef]
Zobeiri, A. , Ausoni, P. , Avellan, F. , and Farhat, M. , 2012, “ How Oblique Trailing Edge of a Hydrofoil Reduces the Vortex-Induced Vibration,” J. Fluids Struct., 32, pp. 78–89. [CrossRef]
Peter, D. , Mirjam, S. , and André, C. , 2013, Flow-Induced Pulsation and Vibration in Hydroelectric Machinery, Springer, London.
Spence, R. , and Aaral-Teixeira, J. , 2009, “ A CFD Parametric Study of Geometrical Variations on the Pressure Pulsations and Performance Characteristics of a Centrifugal Pump,” Comput. Fluids, 38(6), pp. 1243–1257. [CrossRef]
Yang, S. S. , Liu, H. L. , Kong, F. Y. , Xia, B. , and Tan, L. W. , 2014, “ Effects of the Radial Gap Between Impeller Tips and Volute Tongue Influencing the Performance and Pressure Pulsations of Pump as Turbine,” ASME J. Fluids Eng., 136(5), p. 054501. [CrossRef]
Solis, M. , Bakir, F. , and Khelladi, S. , 2009, “ Pressure Fluctuations Reduction in Centrifugal Pumps: Influence of Impeller Geometry and Radial Gap,” ASME Paper No. 78240.
Wu, D. Z. , Yan, P. , Chen, X. , Wu, P. , and Yang, S. , 2015, “ Effect of Trailing-Edge Modification of a Mixed-Flow Pump,” ASME J. Fluids Eng., 137(10), p.101205. [CrossRef]
Al-Qutub, A. M. , Khalifa, A. E. , and Al-Sulaiman, F. A. , 2012, “ Exploring the Effect of V-Profiled Cut at Blade Exit of a Double Volute Centrifugal Pump,” ASME J. Pressure Vessel Technol., 134(2), p. 021301. [CrossRef]
Zhang, N. , Yang, M. G. , Gao, B. , and Li, Z. , 2015, “ Vibration Characteristics Induced by Cavitation in a Centrifugal Pump With Slope Volute,” Shock Vib., 2015, p. 294980.
Zhang, N. , Yang, M. G. , Gao, B. , Li, Z. , and Ni, D. , 2015, “ Experimental Investigation on Unsteady Pressure Pulsation in a Centrifugal Pump With Special Slope Volute,” ASME J. Fluids Eng., 137(6), p. 061103. [CrossRef]
Stel, H. , Amaral, G. D. L. , Negrao, C. O. R. , Chiva, S. , Estevam, V. , and Morales, R. E. M. , 2013, “ Numerical Analysis of the Fluid Flow in the First Stage of a Two-Stage Centrifugal Pump With a Vaned Diffuser,” ASME J. Fluids Eng., 135(7), p. 071104. [CrossRef]
Posa, A. , Lippolis, A. , and Balaras, E. , 2015, “ Large-Eddy Simulations of a Mixed-Flow Pump at Off-Design Conditions,” ASME J. Fluids Eng., 137(10), p. 101302. [CrossRef]
Posa, A. , Lippolis, A. , Verzicco, R. , and Balaras, E. , 2011, “ Large-Eddy Simulations in Mixed-Flow Pumps Using an Immersed-Boundary Method,” Comput. Fluids., 47(1), pp. 33–43. [CrossRef]
Yu, G. Z. , and Li, T. , 1987, “ Experimental on Modifying the Blade Exit Parameters Influencing the Pump Performance,” Pump Technol., 1, pp. 8–15.
Dong, L. , Dai, C. , Bai, Y. , and Xiao, J. W. , 2014, “ The Blade Profile's Impact on the Performance of the Pumps as Turbines,” China Rural Water Hydropower, 7, pp. 170–172.

Figures

Grahic Jump Location
Fig. 1

Different blade trailing edges designed for investigation: (a) OTE, (b) CE, (c) EPS, (d) ESS, and (e) EBS

Grahic Jump Location
Fig. 2

Partial computational zone of the model pump

Grahic Jump Location
Fig. 3

Structured mesh of the impeller

Grahic Jump Location
Fig. 4

Locations of pressure monitoring points

Grahic Jump Location
Fig. 6

Comparison between experimental and numerical results of the OTE pump

Grahic Jump Location
Fig. 7

Predicted performances of model pump with different blade trailing edges (steady-state, SST k–ω)

Grahic Jump Location
Fig. 8

Comparison of pressure amplitude spectra of the OTE model pump at nominal flow rate

Grahic Jump Location
Fig. 9

Time-domain pressure signals for the pump with different blade trailing edges at four positions and the relative impeller positions with related to the volute tongue at nominal flow rate

Grahic Jump Location
Fig. 10

Pressure spectra of the pump with different blade trailing edges at four positions at nominal flow rate

Grahic Jump Location
Fig. 11

Comparison of pressure amplitude at fBPF at nominal flow rate

Grahic Jump Location
Fig. 12

Comparison of pressure amplitude at 2fBPF at nominal flow rate

Grahic Jump Location
Fig. 13

Vorticity distributions on different blade trailing edges at nominal flow rate

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In