Experimental research of the cavitation bubble dynamics during the second oscillation period near a spherical particle

Journal of Hydrodynamics, Год журнала: 2023, Номер 35(4), С. 700 - 711

Опубликована: Авг. 1, 2023

Язык: Английский

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Laser-induced cavitation bubble near boundaries

Journal of Hydrodynamics, Год журнала: 2023, Номер 35(5), С. 858 - 875

Опубликована: Окт. 1, 2023

Язык: Английский

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Dynamic characteristic analysis of pressure pulsations of a pump turbine in turbine mode utilizing variational mode decomposition combined with Hilbert transform

Energy, Год журнала: 2023, Номер 280, С. 128148 - 128148

Опубликована: Июнь 16, 2023

Язык: Английский

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Hydrodynamic feature extraction and intelligent identification of flow regimes in vaneless space of a pump turbine using improved empirical wavelet transform and Bayesian optimized convolutional neural network

Energy, Год журнала: 2023, Номер 282, С. 128705 - 128705

Опубликована: Авг. 10, 2023

Язык: Английский

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Experimental investigation on pressure fluctuation characteristics of a mixed-flow pump as turbine at turbine and runaway conditions

Journal of Energy Storage, Год журнала: 2022, Номер 55, С. 105562 - 105562

Опубликована: Сен. 18, 2022

Язык: Английский

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Influence of gate cutoff effect on flow mode conversion and energy dissipation during power-off of prototype tubular pump system

Energy, Год журнала: 2024, Номер 308, С. 132957 - 132957

Опубликована: Авг. 27, 2024

Язык: Английский

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Analysis of transient hydraulic failure mechanisms induced by gate malfunction during shutdown of large axial flow pump systems

Engineering Failure Analysis, Год журнала: 2025, Номер unknown, С. 109673 - 109673

Опубликована: Май 1, 2025

Язык: Английский

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Pulsation Stability Analysis of a Prototype Pump-Turbine during Pump Mode Startup: Field Test Observations and Insights

Processes, Год журнала: 2024, Номер 12(4), С. 838 - 838

Опубликована: Апрель 21, 2024

Pump-turbines experience complex flow phenomena and fluid–structure interactions during transient operations, which can significantly impact their stability performance. This paper presents a comprehensive field test study of the pump mode startup process for 150 MW prototype pump-turbine. By analyzing pressure fluctuations, structural vibrations, short-time Fourier transform (STFT) results, multiple stages were identified, each exhibiting distinct characteristics. These characteristics influenced by factors such as runner rotation, free surface sloshing in draft tube, rotor–stator interactions. The natural frequencies metallic components varied speed-up water-filling stages, potentially due to gyroscopic effects or stress-stiffening phenomena. opening guide vanes dewatering valve inside altered amplitude interaction frequency, transitioning vibration behavior from forced self-excited regimes. Interestingly, tube fluctuations exhibited that deviated existing prediction methods. substantial observed this help researchers deepen understanding pump-turbines operations identify more meaningful research directions.

Язык: Английский

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Numerical simulation of transient characteristics in a bulb turbine during the load rejection process

Journal of Hydrodynamics, Год журнала: 2024, Номер 36(1), С. 170 - 183

Опубликована: Фев. 1, 2024

Язык: Английский

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Validation and simulation of cavitation flow in a centrifugal pump by filter-based turbulence model

Engineering Applications of Computational Fluid Mechanics, Год журнала: 2022, Номер 16(1), С. 1724 - 1738

Опубликована: Авг. 20, 2022

The simulation of cavitation flow is sensitive to the turbulence model and model. To improve accuracy numerical simulation, a centrifugal pump with specific speed 56.5 taken as research object, Filter-Based Model (FBM) was used correct RNG Zwart-Gerber-Belamri (ZBG) model, Kunz Schnerr-Sauer were employed for in pump. According comparison, results calculated by ZGB 8% closer experimental predictions. occurs around impeller ring balance holes firstly, then vapor develops cover 80% blade suction side. By using Q-criterion, distribution vortex core region under different conditions investigated. volume high intensity severe condition 30%∼50% higher than that other conditions. Furthermore, radial force corresponds number blades, affects resultant direction impeller. With intensification cavitation, increases gradually, regularity will be disorder.

Язык: Английский

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