Flow-induced vibration analysis in a pump-turbine runner under transient operating conditions

Guo, Junxun; Zhou, Daqing; Chen, Huixiang; Wang, Haobo

doi:10.1080/19942060.2023.2266662

Engineering Applications of Computational Fluid Mechanics

2023

DOI: 10.1080/19942060.2023.2266662

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Flow-induced vibration analysis in a pump-turbine runner under transient operating conditions

Junxun Guo,

Daqing Zhou,

Huixiang Chen

et al.

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2024

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Cited by 4 publications

References 32 publications

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Vortex motion in vaneless space and runner passage of pump-turbine in S-shaped region

Liu,

Li,

et al. 2024

Physics of Fluids

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This study examines the S-characteristic, a key factor affecting the safe grid connection and operation of pumped-storage units, and its significant impact on the safety of pumped-storage power stations. We conducted numerical simulations and model experiments to investigate vortex motion characteristics in the vaneless space and runner passage of pump-turbines operating within the S-shaped region, along with an analysis of pressure pulsation characteristics. The accuracy of these simulations was validated through laser Doppler velocimetry experiments, and particle image velocimetry experiments were used to capture vortex motion in the vaneless space. We observed that vortices generated on the guide vane side follow the flow direction, blocking the guide vane passage, while those generated by runner blades move in the opposite direction. Employing an entropy production theory and the Liutex method, we investigated vortex distribution and hydraulic loss in the S-shaped region. The results show that reduced flow rates lead to significant vortices in the vaneless space and guide vane area, which become main contributors to energy loss in this region. These vortices, along with those in the runner passage, mainly arise from flow separation on blade and guide vane surfaces due to suboptimal inflow conditions. The study also identifies pressure fluctuations in the vaneless space, induced by a rotating stall, as the most significant pressure pulsation phenomenon, which significantly impacts the performance of the unit in both upstream and downstream directions.

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Vortex motion in vaneless space and runner passage of pump-turbine in S-shaped region

Liu,

Li,

et al. 2024

Physics of Fluids

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A novel multi-excitation transient vibration framework for coupling three- and one-dimensional pumped storage hydropower shafting systems

Feng,

Sun,

Zhang

et al. 2024

Physics of Fluids

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In vibration models of shafting systems, the hydraulic excitation is difficult to characterize due to the complex and changeable hydraulic factors. Thus, hydropower units are not well understood in terms of their dynamics and stability control under transient processes. A hydraulic–mechanical–electric multi-excitation transient vibration calculation framework is developed for analyzing the relationship between shafting vibration and internal flow regimes. First, the boundary data from penstocks, tailraces, and hydro-turbine are interacted with using one-dimensional and three-dimensional (1D–3D) coupling; Second, user-defined function secondary development is applied to achieve two-stage guide vane closure and the runner's variable speed rotation; Third, based on the computational fluid dynamics results, a multi-excitation vibration model is established to analyze shafting system characteristics. There is less than 1.2% error between the algorithm and the field test in terms of speed peak values. Under braking or reverse pumping modes, various vortice clusters are generated in the blade channel as well as the cascade, blocking the flow passage and leading to the runner's unbalanced force. Three sudden increases in vibration amplitudes of the shafting system have occurred in the radial direction under load rejection, each corresponded to the runner's stall rotations. The change trend in axial vibration amplitudes, however, is closely related to the change in axial hydraulic thrust. Furthermore, in braking and reverse pumping conditions, the axis trajectory is more complex under the action of multiple coupling factors than when only hydraulic factors are considered.

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Mechanism analysis of the abnormal head-cover vibration of an ultra-high-head pump-turbine operating in pump mode by CFD and FEM

Xue,

Tian,

Cheng

et al. 2024

Engineering Applications of Computational Fluid Mechanics

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Flow-induced vibration analysis in a pump-turbine runner under transient operating conditions

Cited by 4 publications

References 32 publications

Vortex motion in vaneless space and runner passage of pump-turbine in S-shaped region

Vortex motion in vaneless space and runner passage of pump-turbine in S-shaped region

A novel multi-excitation transient vibration framework for coupling three- and one-dimensional pumped storage hydropower shafting systems

Mechanism analysis of the abnormal head-cover vibration of an ultra-high-head pump-turbine operating in pump mode by CFD and FEM

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