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Mechanistic insights into fatigue behavior of pump-turbine at different guide vanes opening: A study of dynamic stress response and chaos phenomena

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  • Fang, Mingkun
  • Liang, Quanwei
  • Xiao, Ruofu
  • Tao, Ran

Abstract

Pumped storage plays a critical role in energy storage, contributing significantly to grid load balancing and system stability. The dynamic stress signal characteristics of pump-turbine guide vanes vary considerably under different load conditions, making it challenging to predict fatigue life during stable operation. In this study, numerical simulations were employed to analyze the internal flow and structural dynamic stress signals of guide vanes under three different loads, focusing on the pump operating condition with a guide vane opening of 22°. Variational Mode Decomposition (VMD) is utilized to decompose the dynamic stress signals, and the relationship between the characteristic frequencies of the dynamic stress signals and the unsteady flow features in the internal flow field is examined. Finally, the Miner fatigue prediction method is applied to estimate the fatigue life of guide vanes under different loads. The results indicate that the periodic stress variations caused by unsteady flow accelerate the structural fatigue of the guide vanes. Under low flow condition, dynamic stress signals exhibit high behavioral complexity and dispersion. These findings provide valuable data to inform maintenance and inspection schedules for guide vanes.

Suggested Citation

  • Fang, Mingkun & Liang, Quanwei & Xiao, Ruofu & Tao, Ran, 2025. "Mechanistic insights into fatigue behavior of pump-turbine at different guide vanes opening: A study of dynamic stress response and chaos phenomena," Energy, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:energy:v:320:y:2025:i:c:s0360544225008710
    DOI: 10.1016/j.energy.2025.135229
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    2. Xuan, Yifan & Zhu, Guojun & Feng, Jianjun & Wang, Like, 2025. "Research on start-up strategy of mixed-flow pumps in pumped storage systems: Quantitative assessment and optimal mode acquisition," Energy, Elsevier, vol. 333(C).
    3. Hongqiang Tang & Qifei Li & Xiangyu Chen & Zhanyong Li & Shiwei Li, 2025. "A Study on the Transient Flow Characteristics of Pump Turbines Across the Full Operating Range in Turbine Mode," Energies, MDPI, vol. 18(13), pages 1-28, July.

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