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Research on Hydraulic Characteristics in Diversion Pipelines under a Load Rejection Process of a PSH Station

by 1,2,*, 1,2 and 3
1
College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
2
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
3
Chongqing Jiangjin Shipbuliding Industry Co., LTD, Chongqing 402263, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(1), 44; https://doi.org/10.3390/w11010044
Received: 3 December 2018 / Revised: 20 December 2018 / Accepted: 21 December 2018 / Published: 27 December 2018
(This article belongs to the Section Hydraulics)
Transient analysis in diversion pipelines should be performed to ensure the safety of a hydropower system. After the establishment of a three-dimensional (3D) geometric model from the part upstream reservoir to the diversion pipeline end in a pumped storage hydropower (PSH) station, the hydraulic characteristics of the diversion system were solved by Reynold average Navier–Stokes (RANS) equations based on a volume of fluid (VOF) method under the condition of simultaneous load rejection of two units. The variations of the water level in the surge tank, the pressure at the pipeline end, and the velocity on the different pipeline sections with time were obtained through the calculation. The numerical results showed that the water level changing in the surge tank simulated by VOF was consistent with the field test data. These results also showed that a self-excited spiral flow occurs in the pipeline when the flow at the end of the pipeline was reduced to zero and its intensity decreased with the flow energy exhaustion. The discovery of the self-excited spiral flow in the study may provide a new explanation for the pressure wave attenuation mechanism. View Full-Text
Keywords: pumped storage hydropower station; diversion system; load rejection; 3D numerical simulation; spiral flow pumped storage hydropower station; diversion system; load rejection; 3D numerical simulation; spiral flow
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Zhou, D.; Chen, H.; Chen, S. Research on Hydraulic Characteristics in Diversion Pipelines under a Load Rejection Process of a PSH Station. Water 2019, 11, 44.

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