Author(s): Wenlong Zhao; Jian Zhang; Yi Liu; Lin Shi
Linked Author(s): Jian Zhang, Wenlong Zhao
Keywords: Pumped storage hydropower Surge chamber Load disturbances Hydraulic oscillations
Abstract: The surge chambers play a crucial role in moderating the oscillation in pumped storage hydropower plants after load disturbance. Due to the higher costs, higher risks, and extended construction periods of the conventional surge chamber (CSC), the shaft coaxial surge chamber (SCSC) is proposed. In this study, physical model systems of two type surge chambers are established. Through experimental comparisons and theoretical analysis, the hydraulic oscillations, stability, and flow characteristics of the SCSC were explored compared with the CSC. The results showed that during steady-state operations, the novel SCSC system could maintain stable. Due to the mote complex longitudinal backflow and unstable flow patterns at the SCSC connecting pipe, the hydraulic oscillations and stability were inferior to those of the CSC, especially in pumping conditions. During disturbance process, the SCSC exhibited greater pressure and water level fluctuations compared to the CSC. The water level fluctuation amplitudes of the SCSC were at least 1.43 times that of the CSC.
Year: 2025