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Article

Numerical Simulation of Internal Flow Characteristics and Pressure Fluctuation in Deceleration Process of Bulb Tubular Pump

1
College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 214000, China
2
Jiangsu Zhenjiang Jianbi Pumping Station Management Office, Zhenjiang 212006, China
3
Luoyun Water Conservancy Project Management Divison in Jiangsu Province, Suqian 223800, China
4
Jurong Water Conservancy Bureau in Jiangsu Province, Jurong 212499, China
*
Author to whom correspondence should be addressed.
Academic Editors: Changliang Ye, Xijie Song and Ran Tao
Water 2022, 14(11), 1788; https://doi.org/10.3390/w14111788
Received: 19 April 2022 / Revised: 29 May 2022 / Accepted: 31 May 2022 / Published: 2 June 2022
(This article belongs to the Special Issue Advancement in the Fluid Dynamics Research of Reversible Pump-Turbine)
In order to explore the change in internal and external characteristics and the pressure fluctuation of the large bulb tubular pump unit during deceleration, a transient and steady three-dimensional (3D) numerical simulation is executed, based on the standard k-ε turbulence model and the change in boundary conditions such as flow rate. Finally, the pressure fluctuation data are analyzed by the wavelet method. There is a good agreement between the experimental data and numerical simulation results. During the deceleration process of the unit, the head decreases linearly while the efficiency remains stable. Meanwhile, the shock phenomenon and hysteresis effect appear before and after the unit head deceleration. Although there are vortex and backflow in the outlet conduit during deceleration, the pressure distribution on the suction surface of the impeller blades changes uniformly and significantly. The pressure fluctuation changes on the inlet surface of the impeller are more obvious during the deceleration: the closer to the hub, the greater the pressure, and this change decreases with decreasing radius. The fluctuation energy is mainly concentrated in the high-frequency region of 100–120 Hz and decreases uniformly with the deceleration of the rotational speed. This paper provides a reference for the energy utilization and safe operation of the water pump unit in adjusting speeds with variable frequency. View Full-Text
Keywords: bulb tubular pump; numerical simulation; adjusting speed; transition process; pressure fluctuation bulb tubular pump; numerical simulation; adjusting speed; transition process; pressure fluctuation
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MDPI and ACS Style

Li, J.; Xu, F.; Cheng, L.; Pan, W.; Zhang, J.; Shen, J.; Ge, Y. Numerical Simulation of Internal Flow Characteristics and Pressure Fluctuation in Deceleration Process of Bulb Tubular Pump. Water 2022, 14, 1788. https://doi.org/10.3390/w14111788

AMA Style

Li J, Xu F, Cheng L, Pan W, Zhang J, Shen J, Ge Y. Numerical Simulation of Internal Flow Characteristics and Pressure Fluctuation in Deceleration Process of Bulb Tubular Pump. Water. 2022; 14(11):1788. https://doi.org/10.3390/w14111788

Chicago/Turabian Style

Li, Jiaxu, Fengyang Xu, Li Cheng, Weifeng Pan, Jiali Zhang, Jiantao Shen, and Yi Ge. 2022. "Numerical Simulation of Internal Flow Characteristics and Pressure Fluctuation in Deceleration Process of Bulb Tubular Pump" Water 14, no. 11: 1788. https://doi.org/10.3390/w14111788

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