Effects of the Centrifugal Pump Outlet Blade Angle on Its Internal Flow Field Characteristics under Cavitation Condition

Document Type : Regular Article

Authors

1 College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

2 School of Civil Engineering, Nanchang Institute of Technology, Nanchang, 330044, China

3 Machine Industry Lanzhou Petrochemical Equipment Inspection Institute Co., LTD, Lanzhou, 730070, China

Abstract

The outlet blade angle is a key geometrical parameter that governs how the impeller directly influences centrifugal pump performance. Therefore, a reasonable angle selection is crucial. To investigate the effects of the outlet blade angle on centrifugal pump internal flow field characteristics under cavitation conditions, this study employs a combination of a modified SST k-ω turbulent model with a Zwart-Gerber-Belamri cavitation model to perform transient flow simulations. Outlet blade angles of 15°, 20°, 25°, 30°, and 35° were tested. The results indicated that as the outlet blade angle increased, the relative liquid flow angle, vapor volume, and corresponding fraction first increased, then decreased, and finally increased again. Meanwhile, the distribution scope of each stall vortex on the suction surface became smaller, then larger, and smaller again, whereas the scopes of the pressure surfaces grew constantly as the outlet blade angle increased. Pressure fluctuations at all monitored points in the volute became weaker over time, and variations in the pressure fluctuations alternated with the outlet blade angle. The main frequency amplitude increased and the frequency doubling decreased as the outlet blade angle increased. Although the energy corresponding to the main frequency was unstable, it consistently held the dominant position. The duration that cavitation compliance was less than 0 first decreased and then increased as the outlet blade angle increased. For the impeller with an outlet blade angle of 25°, stall vortices accounted for the smallest regions, and the duration of negative cavitation compliance was minimized. In this case, the overall performance of the centrifugal pump was optimal.
 

Keywords

References

Bacharoudis, E. C., A. E. Filios, M. D. Mentzos and D. P. Margaris (2008). Parametric study of a centrifugal pump impeller by varying the outlet blade angle. The Open Mechanical Engineering Journal 2(1), 75-83.##
Biryukov, D., D. Gerasimov and E. Yurin (2022). Cavitation and Associated Phenomena. Boca Raton: CRC Press.##
Bozorgasareh, H., J. Khalesi, M. Jafari and H. O. Gazori (2021). Performance improvement of mixed-flow centrifugal pumps with new impeller shrouds: Numerical and experimental investigations. Renewable Energy 163(Aug.), 635-648.##
Chen, X. B., R. H. Zhang and W. F. Yang (2022). Inverse design and optimization of low specific speed centrifugal pump blade based on adaptive pod hybrid model. Journal of Applied Fluid Mechanics 15(2),453-464.##
Coutier-Delgosha, O., R. Fortes-Patella and J. L. Reboud (2003). Evaluation of the turbulence model influence on the numerical simulations of unsteady cavitation. Journal of Fluids Engineering-Transactions of the ASME 125(1), 38-45.##
Decaix, J. and E. Goncalves (2013). Compressible effects modeling in turbulent cavitating flows. European Journal of Mechanics-B/Fluids 39(39), 11-31.##
Donmez, A. H., Z. Yumurtaci and L. Kavurmacioglu (2019). The effect of inlet blade angle variation on cavitation performance of a centrifugal pump: A Parametric Study. Journal of Fluids Engineering 141(2), 021101.##
Dular, M., R. Bachert, C. Schaad and B. Stoffel (2007). Investigation of a re-entrant jet reflection at an inclined cavity closure line. European Journal of Mechanics-B/Fluids 26(5), 688-705.##
Elyamin, G. R. H. A., M. A. Bassily, K. Y. Khalil and M. S. Gomaa (2019). Effect of impeller blades number on the performance of a centrifugal pump. Alexandria Engineering Journal 58, 39-48.##
Ennouri, M., H. Kanfoudi, A. Bel Hadj Taher and R. Zgolli (2019). Numerical flow simulation and cavitation prediction in a centrifugal pump using an SST-SAS turbulence model. Journal of Applied Fluid Mechanics 12(1), 25-39.##
Ferziger, J. H., M. Peric and R. L. Street (2019). Computational Methods for Fluid Dynamics. Berlin: Springer.##
Grist, E (1998). Cavitation and the Centrifugal Pump: A Guide for Pump Users. Boca Raton: CRC Press.##
Matlakala, M. E., D. V. V. Kallon, K. E. Mogapi, I. M. Mabelane and D. M. Makgopa (2019). Influence of impeller diameter on the performance of centrifugal pumps. IOP Conference Series: Materials Science and Engineering 655(1), 012009.##
Mohammadi, N. and M. Fakharzadeh (2017). Analysis of effect of impeller geometry including outlet blade angle on the performance of multi-pressure pumps: Simulation and Experiment. Mechanika 23(1), 107-119.##
Peng, G. J., Q. Chen, L. Zhou, B. Pen and Y. Zhu (2020). Effect of Blade Outlet Angle on the Flow Field and Preventing Overload in a Centrifugal Pump. Micromachines 11(9), 811-822.##
Shi, W. D., L. Zhou, W. G. Lu, B. Pei and T. Lang (2013) Numerical prediction and performance experiment in a deep-well centrifugal pump with different impeller outlet width. Chinese Journal Of Mechanical Engineering 26(1), 46-52.##
Shigemitsu, T., J. Fukutomi and K. Kaji (2011). Influence of outlet blade angle and blade thickness on performance and internal flow conditions of mini centrifugal pump. International Journal of Fluid Machinery and Systems 4(3), 317-323.##
Shojaeefard, M. H., M. Tahani, M. B. Ehghaghi, M. A. Fallahian and M. Beglari (2012). Numerical study of the effects of some geometric characteristics of a centrifugal pump impeller that pumps a viscous fluid. Computers & Fluids 60(Feb.), 61-70.##
Su, X., W. Jin, Z. Zu, Z. Li and H. Jia (2021). Performance characteristics and energy loss analyses of a high-speed centrifugal pump with straight blades. Journal of Applied Fluid Mechanics 14(5), 1377-1388.##
Tu, J. Y., G. H. Yeoh and C. Q. Liu (2007). Computational Fluid Dynamics: A Practical Approach. Netherlands: Elsevier.##
Wang, T., X. B. Liu, X. D. Lai and Q. Q. Gou (2016). Effects of blade inlet width on performance of centrifugal pump as turbine with special impeller using in turbine mode, ASME 2016 Fluids Engineering Division Summer Meeting.##
Wilcox, D. C. (1994). Simulation of transition with a two-equation turbulence model. AIAA Journal 32(2), 247-255.##
Wilcox, D. C. (2008). Formulation of the k-ω turbulence model revisited. AIAA Journal 46(11), 2823-2838.##
Zhang, H. L., F. Y. Kong, A. X. Zhu, F. Zhao and Z. F. Xu (2020). Effect of outlet blade angle on radial force of marine magnetic drive pump. Shock and Vibration, 2020(Sep.), 1-18.##
Zwart, P. J., A. Gerber and G. Belamri (2004). A Two-Phase Flow Model for Predicting Cavitation Dynamics, Proceedings of the Fifth international conference on multiphase flow, Yokohama, Japan, 152, 11.##
 
Journal of Applied Fluid Mechanics
Volume 16, Issue 2 - Serial Number 70
February 2023
Pages 389-399

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History

  • Received: 21 April 2022
  • Revised: 21 September 2022
  • Accepted: 29 September 2022
  • Available online: 30 November 2022

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