Optimization of a centrifugal pump with high efficiency and low noise based on fast prediction method and vortex control

Energy, Год журнала: 2023, Номер 289, С. 129835 - 129835

Опубликована: Дек. 11, 2023

Язык: Английский

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A universal hydraulic-mechanical diagnostic framework based on feature extraction of abnormal on-field measurements: Application in micro pumped storage system

Applied Energy, Год журнала: 2023, Номер 357, С. 122478 - 122478

Опубликована: Дек. 20, 2023

Язык: Английский

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Analysis of transient pressure of pump-turbine during load rejection based on a multi-step extraction method

Energy, Год журнала: 2024, Номер 292, С. 130578 - 130578

Опубликована: Фев. 6, 2024

Язык: Английский

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Numerical study of rotor-stator interaction in variable speed reversible pump-turbine in turbine mode at low head

Journal of Physics Conference Series, Год журнала: 2024, Номер 2752(1), С. 012073 - 012073

Опубликована: Июнь 1, 2024

Abstract Pumped storage hydropower (PSH) offers the cost-effective of large quantities energy with high efficiency. Reversible pump-turbines (RPT) are used in PSPs having head variations and where variable speed operation can enhance its efficiency grid stability. The RPT may experience higher fatigue vibrations due to hydraulic instabilities caused by pressure fluctuations vaneless space between runner blades guide vane interaction, known as rotor-stator interaction (RSI). Because this instability, local components powerhouse vibrate severely. Therefore, there is a need study RSI RPTs. present numerical focuses on turbine mode conditions low available head. reduced scale high-head model, SST k-ω turbulence model was carry out calculations. analysis performed at best point operating optimized rotational speed. showed that main source all RSI, dominant frequency BPF harmonics.

Язык: Английский

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Dynamic behavior and energy dissipation analysis of pump turbine in unstable S characteristic zone

Journal of Energy Storage, Год журнала: 2024, Номер 102, С. 114275 - 114275

Опубликована: Окт. 21, 2024

Язык: Английский

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An intelligent identification method of draft tube vortex rope based on dynamic feature extraction and random forest: Application to a prototype pump-turbine

Journal of Energy Storage, Год журнала: 2024, Номер 102, С. 114227 - 114227

Опубликована: Окт. 22, 2024

Язык: Английский

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A data-driven identification of runner flow patterns in a model pump-turbine by machine learning methods

Journal of Energy Storage, Год журнала: 2024, Номер 103, С. 114245 - 114245

Опубликована: Окт. 28, 2024

Язык: Английский

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Dynamic and flow instability analysis during runaway process for a pump turbine

Engineering Applications of Computational Fluid Mechanics, Год журнала: 2024, Номер 18(1)

Опубликована: Ноя. 14, 2024

A power failure in the pump condition combined with rejection of guide vanes can cause unit to runaway, which represents a dangerous transitional process for pumped storage stations. This is accompanied by intense oscillations internal flow, pressure fluctuations, and changes runner forces. study aims clarify unstable flow characteristics during runaway focusing on transient behaviour from high-head model turbine. The numerical calculation speed discharge are consistent experimental test results. results indicate that dynamic curve not continuously stable but exhibits before reaching relatively condition. Significant fluctuations high amplitudes observed braking zone close Further analysis reveals low frequency, amplitude within various components at frequencies smaller than rotational frequency (fn). Axial forces demonstrate linear correlation change rate discharge. evolution backflow vortex inlet main significant axial runner. scale gradually increases as decreases, peaking zone. Entering turbine operating condition, its intensity decreases some extent significantly expanded range. Near optimal around becomes smooth. As further increases, eventually forming ring structure inlet. indicates inevitably disrupts leading increase fluctuation more pronounced

Язык: Английский

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Revealing the evolution of flow structure and pressure fluctuations in a multiphase pump under varying gas phase conditions

Physics of Fluids, Год журнала: 2025, Номер 37(4)

Опубликована: Апрель 1, 2025

Multiphase pumps are vital for extracting oil and gas from deep-sea environments transporting blended media in chemical processes. The phase significantly alters these pumps' flow structure pressure fluctuations. Our study reveals that injection boosts axial circumferential velocities, disrupts velocity matching between the impeller diffuser, leads to backflow pump surge. Further, vaneless region is divided into six regions according influence of mainstream, wake jet, clearance, end wall, summarizes four-speed triangle transition modes (VSFTM) region. VSFTMs mainstream wall areas worsen flow. Moreover, turbulent kinetic energy pulsation also enhanced. VSFTM gap zones helps with speed but reduces water head. Analysis fluctuation shows standard deviation relative amplitude coefficient rise inlet volume fraction (IGVF). A 10% IGVF increase results a surge 1.4–1.6 times peak coefficient. These findings advance our understanding effect multiphase pumps.

Язык: 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, Год журнала: 2025, Номер 12

Опубликована: Апрель 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.

Язык: Английский

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