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

Energy Conversion and Management, Journal Year: 2024, Volume and Issue: 325, P. 119370 - 119370

Published: Dec. 12, 2024

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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Multi-scale leakage vortex interaction analysis in tip clearance of low-head pumped hydroelectric energy storage systems in pump mode

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 101, P. 113821 - 113821

Published: Oct. 5, 2024

Language: Английский

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Performance Analysis and Optimization of Compressed Air Energy Storage Integrated with Latent Thermal Energy Storage

Energies, Journal Year: 2024, Volume and Issue: 17(11), P. 2608 - 2608

Published: May 28, 2024

Recovering compression waste heat using latent thermal energy storage (LTES) is a promising method to enhance the round-trip efficiency of compressed air (CAES) systems. In this study, systematic thermodynamic model coupled with concentric diffusion transfer cylindrical packed-bed LTES established for CAES system, and numerical simulation validated by experimental data in reference. Based on model, charging–discharging performance systems evaluated under different layouts phase change materials (PCMs) LTES, optimal layout PCM specified as three-stage layout, since exergy are improved 8.2% 6.9% compared one-stage layout. Then, proportion three PCMs optimized response surface methods. The optimization results indicate that system expected be 80.9% 73.3% 0.48:0.3:0.22 stages, which 7.0% 13.1% higher than original equal proportions.

Language: Английский

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Gravity-induced virtual clocking effect in large-capacity/low-head pumped hydro energy storage system with horizontal shaft

Sustainable Energy Technologies and Assessments, Journal Year: 2023, Volume and Issue: 60, P. 103441 - 103441

Published: Sept. 6, 2023

Language: Английский

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Analysis of Stress Characteristics of a Vertical Centrifugal Pump Based on Fluid-Structure Interaction

Water, Journal Year: 2023, Volume and Issue: 15(24), P. 4269 - 4269

Published: Dec. 13, 2023

Vertical centrifugal pumps play a crucial role in numerous water conservancy projects. However, their continuous operation can lead to the development of cracks or even fractures some pump blades, resulting substantial adverse impact on pumping station unit and jeopardizing safe production. This study employs fluid-structure interaction method comprehensively investigate modal characteristics impeller, both an air environment immersed water. Furthermore, analysis static dynamic stress attributes is conducted. The natural frequency impeller when submerged significantly lower than its medium, typically accounting for approximately 0.35 0.46 air-based frequency. There are conspicuous concentrations at specific locations within system, specifically rounded corners blade back exit edge, front cover, middle inlet junction where interfaces with cover. It underscore that system operates under high-flow low-flow conditions, there pronounced concentration interface between rear cover plate. Any deviation from intended design conditions results escalation equivalent levels. Through calculations during single rotational cycle it discerned cyclic nature point maximum primarily influenced by number blades velocity impeller. research carries significant implications effectively mitigating fatigue damage, thereby enhancing operational reliability vertical applications.

Language: Английский

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Comparative study on stator corner separation vortex characteristics in axial-flow pump and tubular pump: To understand the effects of guide-vane cone diffusion on horn-like vortices

Journal of Physics Conference Series, Journal Year: 2024, Volume and Issue: 2707(1), P. 012022 - 012022

Published: Feb. 1, 2024

Abstract The guide-vane cone diffusion is a typical structural difference between an axial-flow pump and tubular pump, which shown as low diffusivity high respectively, but it still unclear how this affects the vortex characteristics in stator corner separation flows. In paper, comparative study of flows was conducted, effects on vortical structures were clarified. Firstly, for apparent features, compared with diffusivity, horn-like has features smaller scale, weaker swirling strength, shorter evolution cycle lower pressure fluctuations. Secondly, dynamics mechanism, can cause additional energy recovery, leads to higher adverse gradients, so easier induce shroud backflow near suction surface. coupled flow field main flow, namely hub backflow, streamwise periodic oscillation function gradient ω S ·▽(▽ p/ρ ) found, induces unique vortex-street-like distributions deformational vorticity rigid R . This physical effect causes mutual competition opposite side. It originating from that greatly suppresses development pump.

Language: Английский

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Intensity recognition of vortex ropes in draft tube of a prototype pump turbine using an optimized CNN-BiLSTM framework with multi-head self-attention mechanism

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 106, P. 114910 - 114910

Published: Dec. 4, 2024

Language: Английский

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