Comprehensive assessment and analysis of cavitation scale effects on energy conversion and stability in pumped hydro energy storage units

Energy Conversion and Management, Год журнала: 2024, Номер 325, С. 119370 - 119370

Опубликована: Дек. 12, 2024

Язык: Английский

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Leading edge hub vortex-induced flow instability and energy loss in a tubular-flow fish-friendly pump

Physics of Fluids, Год журнала: 2025, Номер 37(3)

Опубликована: Март 1, 2025

A kind of flow distortion is found in the design and application so-called tubular-flow fish-friendly pump, which possesses a highly twisted blade leading edge for reducing fish damage. It named as hub vortex (LEHV) has closer relationship with instability energy loss compared to well-known tip leakage (TLV). Numerical experimental investigations are implemented typical terms evolution LEHV size strength, well vortex-induced low pressure loss. The divided into four stages, namely inception, radial development, alternation rotation direction, detachment. dynamics exhibit distinct periodicity varying intensity position due fluctuation rotating pump. Further results on reveal that volume near much larger than under multiple conditions, indicating cavitation inception more likely occur hub, seems different from common sense appears initially at tip. Moreover, it plays significant role causing TLV wake formed by interaction between causes considerable impeller exit. This study will provide scientific guidance optimization strategies pump improve hydraulic performance stability.

Язык: Английский

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Unsteady energy transfer characteristics of gas–liquid two-phase multiphase pump based on pulsation statistics

Applied Thermal Engineering, Год журнала: 2025, Номер unknown, С. 125582 - 125582

Опубликована: Янв. 1, 2025

Язык: Английский

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Research on the Applicability of Hybrid RANS/LES Models to Predict the Flow Behavior in Bulb Tubular Pump Under Rated and Stall Conditions

Energy Science & Engineering, Год журнала: 2025, Номер unknown

Опубликована: Фев. 21, 2025

ABSTRACT The investigation into the internal flow characteristics of bulb tubular pump device has important practical significance for improving both optimal design and operation stability. This paper uses different RANS/LES turbulence models to conduct numerical simulation research on model device, specifically focusing differences in under small stall condition 0.5 Q des 1.0 . macroscopic energy are verified through experiment tests, revealing that DDES provides better predicted hydraulic performance conditions. difference low conditions is mainly due degrees turbulent field analysis, while analysis degree high‐efficiency rate with uniform remains similar. vortex identification method Omega used visualize structure time‐averaged field, uncovering large‐scale structures conditions, blending offering superior resolution structures. Furthermore, deduces calculation pulsation entropy production based SST formula. A comprehensive local power loss main flow‐passing components—impeller, diffuser, bulb—reveals blades wall surfaces contributors increase losses. comparison shows more accurate predictions visualizing characteristics.

Язык: Английский

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Evaluating the Predictive Potential of Modeling Frameworks for Pelton Turbine Energy Performance and Guiding Engineering Modeling in Hydroelectric Applications

Energy, Год журнала: 2025, Номер unknown, С. 136861 - 136861

Опубликована: Май 1, 2025

Язык: Английский

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