Internal flow mechanism for a pump-turbine operated in pump mode under double humps condition

Science China Technological Sciences, Год журнала: 2025, Номер 68(3)

Опубликована: Фев. 14, 2025

Язык: Английский

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

Journal of Energy Storage, Год журнала: 2023, Номер 72, С. 108397 - 108397

Опубликована: Июль 20, 2023

Язык: Английский

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Co-adjustable guide vane and diffuser vane to improve the energy generation potential of an axial-flow pump as turbine

Energy, Год журнала: 2024, Номер 291, С. 130325 - 130325

Опубликована: Янв. 9, 2024

Язык: Английский

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Study on suppression of cavitating vortex rope on pump-turbines by J-groove

Applied Energy, Год журнала: 2024, Номер 360, С. 122843 - 122843

Опубликована: Фев. 15, 2024

Язык: Английский

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Rotor–stator interaction investigations in variable speed reversible pump-turbine at higher head

Physics of Fluids, Год журнала: 2024, Номер 36(3)

Опубликована: Март 1, 2024

Efficiency and grid stability can be improved by variable speed operation using doubly fed induction machine technology for pumped storage plants experiencing significant head variations. With the higher penetration of intermittent renewable energy sources, viz., solar wind, may stabilized operating reversible pump-turbines (RPTs) in off-design conditions. In a turbine mode, RPT is more susceptible to fatigue vibrations when at as result hydraulic instability generated rotor–stator interaction (RSI); therefore, its performance becomes even critical. The powerhouse structural components, including floors columns, could experience intense because this instability. Therefore, it essential investigate RSI RPTs head. These investigations present results numerical analysis associated pressure fluctuations high-head scaled model was used, simulations were executed utilizing shear stress transport k-ω turbulence model. performed best efficiency point conditions having optimized rotational speed. show that main source all RSI, where dominant frequencies are blade passing frequency (9fn) harmonics. It also found lowers RPT.

Язык: Английский

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Effects of vortex rope formation in draft tube of reversible pump-turbine – A review

Journal of Energy Storage, Год журнала: 2024, Номер 99, С. 113250 - 113250

Опубликована: Авг. 8, 2024

Язык: Английский

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

Renewable Energy, Год журнала: 2023, Номер 212, С. 333 - 349

Опубликована: Май 17, 2023

Язык: Английский

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Optimal hydraulic energy harvesting strategy for PaT installation in Water Distribution Networks

Applied Energy, Год журнала: 2023, Номер 344, С. 121246 - 121246

Опубликована: Май 17, 2023

Water Distribution Networks (WDNs) represent a noteworthy field for possible implementation of Small Hydropower (SHP), by replacing Pressure Reduction Valves (PRV) with turbomachines, in particular Pump as Turbines (PaTs), to control and regulate the pressure, while harvesting energy otherwise wasted. Different models were developed predict performance select positioning PaTs maximum recovery but most them neglect practical aspect such as: power grid limitations optimal strategy. In this framework, we intend propose new method PaT, defining its working point, introducing an exploitation coefficient. The proposed methodology is based on experimental results real PaT tested high capacity hydraulic laboratory at Polytechnic University Bari. Firstly, selected commercial centrifugal pump was both turbine modes. Then, three different approaches, Best Efficiency Point (BEP) selection, are described compared terms factor WDN. first consists selecting BEP average flow rate, second one considers probability distribution rate corresponding available energy, whereas latter highest harvesting. By applying production, economic environmental analyses, methodology, third approach, shows remarkable advantage exploited energy. Indeed 60% achieved 334 ton CO2/year avoided. Furthermore, impact electrical motor generation (cut-off) considered. Eventually, useful insights future selection installation discussed.

Язык: Английский

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Transition of amplitude–frequency characteristic in rotor–stator interaction of a pump-turbine with splitter blades

Renewable Energy, Год журнала: 2023, Номер 205, С. 663 - 677

Опубликована: Фев. 4, 2023

Язык: Английский

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The vortex dynamics characteristics in a pump-turbine: A rigid vorticity analysis while varying guide vane openings in turbine mode

Energy, Год журнала: 2023, Номер 289, С. 130086 - 130086

Опубликована: Дек. 20, 2023

Язык: Английский

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