Flow-Induced Vibration of Non-Rotating Structures of a High-Head Pump-Turbine during Start-Up in Turbine Mode

Mengqi Yang, Weiqiang Zhao, Huili Bi, Haixia Yang, Qilian He, Xingxing Huang and Zhengwei Wang ()
Additional contact information
Mengqi Yang: Branch Company of Maintenance & Test, CSG Power Generation Co., Ltd., Guangzhou 511400, China
Weiqiang Zhao: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Huili Bi: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Haixia Yang: Branch Company of Maintenance & Test, CSG Power Generation Co., Ltd., Guangzhou 511400, China
Qilian He: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Xingxing Huang: S.C.I. Energy, Future Energy Research Institute, Seidengasse 17, 8706 Zurich, Switzerland
Zhengwei Wang: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

Energies, 2022, vol. 15, issue 22, 1-18

Abstract: Pumped storage-power plants play an extremely important role in the modern smart grid due to their irreplaceable advantages in load peak-valley regulation, frequency modulation, and phase modulation. The number of start-stops per day of pump-turbine units is therefore also increasing. During the start-up transient process in turbine mode, the complex flow in runner passage, crown and band chambers, and seal labyrinth is able to induce severe vibration of non-rotating structures such as head cover, stay-ring, and pose a threat to the safe operation of the pump-turbine unit. In this article, the flow-induced vibration of the structures of a pump-turbine unit during its start-up process in turbine mode is studied. In the first place, this investigation establishes a three-dimensional model of the full flow passage and carries out a full three-dimensional CFD calculation based on one-dimensional pipeline calculation results for the start-up transient process. In the next place, by applying the fluid–structure interaction calculation method, the finite element analysis of non-rotating components of the pump-turbine unit is carried out. The flow-induced stresses and deformations of head cover, stay-ring, etc., are obtained and analyzed. The results reveal that the maximum deformation of the non-rotating structures is located at the inner edge of the head cover while the maximum stress appears at the trailing edge fillet of a stay vane. In summary, the dynamic stress of the non-rotating structures changes largely during the start-up process. The stress is strongly related to the axial thrust caused by the fluid flow. The achieved results can provide guidance for further fatigue life assessment of non-rotating structures and contribute to the structural safety design of pump-turbine units.

Keywords: pump-turbine; turbine mode; start-up; non-rotating structures; flow-induced vibration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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