September 10, 2025Physics of Fluids

Runner clearance flow pattern and pressure pulsation in the S-shaped region of high-head pumped storage unit

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Pressure pulsations within the clearance are influenced by both conventional sources and an unidentified mechanism.
Significant pressure fluctuations arise from self-excited vibrations due to unstable vortex shedding near the labyrinth.
Axial force analysis indicates substantial forces under reverse-pump conditions, impacting rotor stability.
Findings provide essential insights for maintaining the stability of pumped storage units during operation.

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Simulation reveals complex pressure pulsations in clearance flow-paths of pumped storage units, suggesting instability implications.

Fu et al. (2025) studied this question.

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