Study on Sand Wear Testing and Numerical Simulation of a 500 MW Class Pelton Turbine

Water, Год журнала: 2025, Номер 17(3), С. 317 - 317

Опубликована: Янв. 23, 2025

Pelton turbines frequently encounter significant sediment wear when operating in sandy river environments. The runner bucket of these is particularly prone to wear, which results considerable reductions turbine efficiency and operational stability. This research focused on a large-scale with 500 MW standalone capacity setting. Numerical simulations sand–water flow within the were conducted using volume fluid (VOF) model, shear stress transport (SST) k-ω discrete phase model (DPM). Additionally, prediction based tests turbine, was utilized estimate bucket. indicated maximum rate 2.61 × 10−7 mm/s. Specifically, 04Cr13Ni5Mo bucket, typically made from stainless-steel wear-resistant material, expected experience over 5.62 mm after one year operation under rated conditions, emphasizing severity wear. To prolong life unit, further investigations into surface resistance treatments for water buckets are recommended.

Язык: Английский

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Rationale of partially averaged Navier–Stokes model and its applications in turbomachinery: A historical review

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

Опубликована: Март 1, 2025

The flow patterns in the turbomachinery are highly turbulent, involving various types of unstable phenomena. In this paper, Reynolds-averaged Navier–Stokes simulation (RANS) as well partially averaged (PANS), which is a hybrid turbulence model providing balance solution between computational cost and accuracy, reexamined with review toward developing methodology for complex turbulent flows. First, fundamental mathematical formulations derivation on RANS PANS models introduced systematically. Especially, rationales some newly proposed simulating large-reverse flow, high-shear stress, high-pressure gradient flows introduced. Furthermore, recent progress unsteady using mainly summarized an emphasis their principles applicability. Some representative engineering applications hydrofoil, pumps, turbines, propellers discussed. It demonstrated that show superior performance predicting cavitating separation, tip leakage wake flow. Last, summary comments drawn. This paper attempts to provide insights guidelines research utilizing turbomachinery. To further promote study turbomachinery, validations employed compressible compressors or other addressed future research.

Язык: Английский

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Study on the Long-Term Sediment Erosion Characteristics of Turbines Considering Geometric Gradients

Опубликована: Янв. 1, 2025

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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Numerical Assessment of the Hydrodynamic Excitation Characteristics of a Pelton Turbine

Sustainability, Год журнала: 2024, Номер 16(23), С. 10667 - 10667

Опубликована: Дек. 5, 2024

The Pelton turbine is an ideal choice for developing high-head hydropower resources. However, its cantilever-beam structure exposes the runner to intense alternating loads from high-velocity jets, causing localized high stresses, structural vibrations, and potential bucket fractures, all of which compromise safe operation. This study employs fluid–structure interaction analysis numerical investigation a six-nozzle examine unstable flow characteristics hydrodynamic excitation under jets. Our findings indicate that low-order frequencies primarily induce overall oscillations, while high-order result in oscillation, torsional displacement, vibrations. Torsional displacement at free end induces stress concentrations root splitter, outflow edge, cut-out. amplitudes are correlated with nozzle opening, typically phase torque, fluctuations exhibit lag. values higher on bucket’s front, maximum occurring particularly regions subjected prolonged jet impact. dominant frequency pulsations matches number nozzles. elucidates dynamic response turbines correlating fluid load dynamics, identifying deformation points, providing technical support performance evaluation.

Язык: Английский

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On erosion wear of flat specimens incorporating roughness angle correction

Physics of Fluids, Год журнала: 2024, Номер 36(10)

Опубликована: Окт. 1, 2024

Particle erosion-induced damage to structural walls constitutes a critical concern in aerospace and petrochemical engineering. Over time, this phenomenon leads surface roughening, thereby altering particle impingement dynamics, facet often overlooked current simulation methodologies. This study proposes novel numerical approach for investigating erosion characteristics of flat specimens, integrating corrective model roughness angle enhance accuracy predicting profiles. Experimental validation confirms the superior performance proposed correction method, achieving remarkable enhancement approximately 60.27% accurately maximum depth compared conventional techniques. Notably, corrected exhibits nonlinear relationship with duration, closely mirroring experimental observations. In regions characterized by intensified rates, present method discloses notable decrease 1.8° forecasted impact angles advancing stages, closer adherence empirical trends. The refined effectively rectifies historical overestimations, offering robust framework future studies prediction mitigation strategies.

Язык: Английский

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Study of sand erosion mechanisms following droplet ingestion in transonic compressors

Powder Technology, Год журнала: 2024, Номер unknown, С. 120577 - 120577

Опубликована: Дек. 1, 2024

Язык: Английский

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