Abstract
The computational fluid dynamics (CFD) approach can be used to obtain both internal and external characteristics of centrifugal pumps, and the variations of the hydrodynamic force, the pressure and the torque on the blades acquired by the CFD are highly associated with the safety of the pumping system. Based on the CFD simulations, this paper investigates the stopping characteristics of multiple pumps with some pumps being stopped. The 3-D geometric model is built, including all 6 pumps, the valves, the pipes, the tanks and other components, and using the Realizable k-ε turbulence model. The CFD results for the operating points agree well with the results from the theoretical analysis. With some pumps being stopped, the key parameters of the operating pumps would not be stable, with a larger fluctuation; the direction of the hydrodynamic force might be opposite with more than 3 stopped pumps. For the stopped pumps, the maximum reverse values of the discharge and the rotational speed would be larger when fewer pumps are stopped, and could be more than 120% of the rated values, which is dangerous for the pumping system. The CFD results could help understanding the stopping process of multiple pump systems with some pumps being stopped.
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Zhang N., Gao B., Xia B. et al. Effect of the volute tongue cut on pressure pulsations of a low specific speed centrifugal pump [J]. Journal of Hydrodynamics, 2020, 32(4): 758–770.
Zhuan X., Xia X. Optimal operation scheduling of a pumping station with multiple pumps [J]. Applied Energy, 2013, 104: 250–257.
Li Z. W., Huai W. X., Qian Z. D. Study on the flow field and concentration characteristics of the multiple tandem jets in crossflow [J]. Science China Technological Sciences, 2012, 55(10): 2778–2788.
Barrio R., Parrondo J., Blanco E. Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points [J]. Computers and Fluids, 2010, 39(5): 859–870.
Wsds A., Pft B., Aub C. et al. A novel method to determine the optimal operating point for centrifugal pumps applied in photovoltaic pumping systems [J]. Solar Energy, 2021, 221: 46–59.
Ghidaoui M. S., Zhao M., McInnis D. A. et al. A review of water hammer theory and practice [J]. Applied Mechanics Reviews, 2005, 58(1): 49–76.
Afshar M. H., Rohani M. Water hammer simulation by implicit method of characteristic [J]. International Journal of Pressure Vessels and Piping, 2008, 85(12): 851–859.
Kim S. G., Lee K. B., Kim K. Y. Water hammer in the pump-rising pipeline system with an air chamber [J]. Journal of Hydrodynamics, 2014, 26(6): 960–964.
Zheng Y., Chen Q., Yan D. et al. A two-stage numerical simulation framework for pumped-storage energy system [J]. Energy Conversion and Management, 2020, 210: 1–18.
Dong W., Chu W., Liu Z. Influences of the diameter of the balance hole on the flow characteristics in the hub cavity of the centrifugal pump [J]. Journal of Hydrodynamics, 2019, 31(5): 1060–1068.
Afshar M. H., Rohani M., Taheri R. Simulation of transient flow in pipeline systems due to load rejection and load acceptance by hydroelectric power plants [J]. International Journal of Mechanical Sciences, 2010, 52(1): 103–115.
Hur J., Kim S., Kim H. Water hammer analysis that uses the impulse response method for a reservoir-pump pipeline system [J]. Journal of Mechanical Science and Technology, 2017, 31(10): 4833–4840.
Rezghi A., Riasi A. Sensitivity analysis of transient flow of two parallel pump-turbines operating at runaway [J]. Renewable energy, 2016, 86: 611–622.
Wan W., Zhang B., Chen X. Investigation on water hammer control of centrifugal pumps in water supply pipeline systems [J]. Energies, 2019, 12(1): 108–127.
Jeong W., Seong J. Comparison of effects on technical variances of computational fluid dynamics (CFD) software based on finite element and finite volume methods [J]. International Journal of Mechanical Sciences, 2014, 78: 19–26.
Zhou D., Chen H., Zhang L. Investigation of pumped storage hydropower power-off transient process using 3D numerical simulation based on SP-VOF hybrid model [J]. Energies, 2018, 11(4): 1020.
Spence R., Amaral-Teixeira J. A CFD parametric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump [J]. Computers and Fluids, 2009, 38(6): 1243–1257.
Trivedi C., Gandhi B. K., Cervantes M. J. et al. Experimental investigations of a model Francis turbine during shutdown at synchronous speed [J]. Renewable Energy, 2015, 83: 828–836.
Shojaeefard M. H., Tahani M., Ehghaghi M. B. et al. Numerical study of the effects of some geometric characteristics of a centrifugal pump impeller that pumps a viscous fluid [J]. Computers and Fluids, 2012, 60: 61–70.
Fu S., Zheng Y., Kan K. et al. Numerical simulation and experimental study of transient characteristics in an axial flow pump during start-up [J]. Renewable Energy, 2020, 146: 1879–1887.
Li D., Wang H., Li Z. et al. Transient characteristics during the closure of guide vanes in a pump-turbine in pump mode [J]. Renewable Energy, 2018, 118: 973–983.
Liu J., Liu S., Sun Y. et al. Three-dimensional flow simulation of transient power interruption process of a prototype pump-turbine at pump mode [J]. Journal of Mechanical Science and Technology, 2013, 27(5): 1305–1312.
Huai W. X., Wang Z. W., Qian Z. D. et al. Numerical simulation of sandy bed erosion by 2D vertical jet [J]. Science China Technological Sciences, 2011, 54(12): 3265–3274.
Martins N. M. C., Soares A. K., Ramos H. M. et al. CFD modeling of transient flow in pressurized pipes [J]. Computers and Fluids, 2016, 126(1): 129–140.
Balduzzi F., Drofelnik J., Bianchini A. et al. Darrieus wind turbine blade unsteady aerodynamics: a three-dimensional Navier-Stokes CFD assessment [J]. Energy, 2017, 128: 550–563.
Pei J., Yuan S. Q., Yuan J. P. et al. The influence of the flow rate on periodic flow unsteadiness behaviors in a sewage centrifugal pump [J]. Journal of Hydrodynamics, 2013, 25(5): 702–709.
Skrzypacz J., Bieganowski M. The influence of micro grooves on the parameters of the centrifugal pump impeller [J]. International Journal of Mechanical Sciences, 2018, 144: 827–835.
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Projects supported by the National Natural Science Foundation of China (Grant Nos. 51879087, 51839008 and 51709087).
Biography: Yue-fei Liu (1991-), Male, Ph. D. Candidate
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Liu, Yf., Zhou, Jx., Guo, Q. et al. 3-D CFD simulation of transients in multiple pump system with some pumps being stopped. J Hydrodyn 33, 583–592 (2021). https://doi.org/10.1007/s42241-021-0042-8
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DOI: https://doi.org/10.1007/s42241-021-0042-8