Unstable pressure fluctuations in the vaneless space of high-head reversible pump-turbines – A systematic review

Journal of Energy Storage, Journal Year: 2023, Volume and Issue: 72, P. 108397 - 108397

Published: July 20, 2023

Language: Английский

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A Brief Review of Recent Research on Reversible Francis Pump Turbines in Pumped Storage Plants

Energies, Journal Year: 2025, Volume and Issue: 18(2), P. 394 - 394

Published: Jan. 17, 2025

As the core for energy conversion in pumped storage plants, pump turbine is also a key component process of building clean power grid, owing to its fast and accurate load regulation. This paper introduces current status research development turbines from perspectives significance, design optimization, operational performance, advanced methods, etc. Internal external characteristics such as transient flow evolution, structural vibration, flow-induced noise, etc., not only reflect performance (hydraulic, cavitation, sediment abrasion, stability etc.) but directly affect safe efficient operation system. It worth mentioning that space-time evolution internal an emerging direction, results which can be used predict conditions turbines. Moreover, application intelligent condition monitoring fault diagnosis aim prevent failures accidents plants.

Language: Английский

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Design techniques for improving energy performance and S-shaped characteristics of a pump-turbine with splitter blades

Renewable Energy, Journal Year: 2023, Volume and Issue: 212, P. 333 - 349

Published: May 17, 2023

Language: Английский

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A fault diagnosis method of rotating machinery based on improved multiscale attention entropy and random forests

Nonlinear Dynamics, Journal Year: 2023, Volume and Issue: 112(2), P. 1191 - 1220

Published: Dec. 14, 2023

Language: Английский

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Mechanism of runner high-pressure side on stall characteristics at typical unsteady operating points in both modes of a pump turbine

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(7)

Published: July 1, 2023

Stall phenomenon, a classical physical phenomenon which is located in the vaneless region of pump–turbine and accompanied by complex vortex evolution process, strongly related to formation hump unsteady at pump mode S turbine mode. In present paper, detached eddy simulation model employed numerically investigate impact runner high-pressure side (HPS) on stall characteristics typical operating points, namely, valley point runaway It found that both investigated points are obviously changed: For point, only three fixed cells exist original plan, while four additional rotating appear rotate speed 0.02nr (nr, rotation speed) optimized plan (OPT). The distinctive coexistence reported for first time attributed controlled HPS; intensity frequency characteristic slightly increased OPT. Moreover, HPS can effectively decrease backflow shroud, resulting significant relative rate within complete flow period, 17.3% 4.8% point. Finally, local hydraulic loss (LHLR) method adopted it high LHLR OPT more concentrated circumferential direction radial vanless points. Based with proposed many might be eliminated some extent.

Language: Английский

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A prospective assessment of scale effects of energy conversion in ultra-low-head pumped hydro energy storage units

Energy Conversion and Management, Journal Year: 2024, Volume and Issue: 315, P. 118798 - 118798

Published: July 26, 2024

Language: Английский

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On the scale effect of energy conversion in large-scale bulb tubular pump: Characteristics, mechanisms and applications

Energy, Journal Year: 2024, Volume and Issue: 292, P. 130528 - 130528

Published: Feb. 6, 2024

Language: Английский

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Modeling and Simulation of High-Frequency Vibration of Headrace Tunnel in a Pumped Storage Power Station Considering Imperfect Bounding Condition

Thin-Walled Structures, Journal Year: 2025, Volume and Issue: unknown, P. 113021 - 113021

Published: Feb. 1, 2025

Language: Английский

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Study on the flow and pressure pulsation characteristics in the hump region of pump- turbine based on C-shaped blade design

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 119, P. 116246 - 116246

Published: March 28, 2025

Language: Английский

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Research on pressure fluctuation distribution law and rotor-stator interaction of pump-turbine in vaneless region of turbine mode

Frontiers in Energy Research, Journal Year: 2025, Volume and Issue: 12

Published: April 4, 2025

The vibration issue of pumped storage power station unit will directly affect the safe and stable operation unit, pressure pulsation in vaneless region is an important index to evaluate stability unit. In order study fluctuation characteristics pump-turbine turbine mode, unsteady numerical simulation maximum head condition rated carried out this research. amplitude-frequency under different influence internal flow on are analyzed. results show that non-uniform field formed due rotor-stator interaction (RSI) between long short blades runner guide vanes. main frequency 5 f n , which half blade passing (BPF), is, combination frequency. sub-frequencies 10 15 20 . addition, amplitude at each higher than condition. a rotating cycle, discrete vortex channel gradually accumulates evolves into big scale side surface blade, aggravates region. intensity larger, reasonably explains reason why larger.

Language: Английский

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