Investigation on sediment erosion in bucket region of Pelton turbine considering cavitation

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(2)

Published: Feb. 1, 2024

In the context of constructing high-head hydro-power stations, Pelton turbine assumes a critical role as primary energy converter. This study employs Eulerian–Lagrangian method to simulate multi-phase flow occurring within bucket. Furthermore, it introduces novel aspect by investigating and comparing effects cavitation on erosion bucket region under varying conditions sediment-water, involving different particle sizes concentrations. The research findings unveiled several key insights. Primarily, predominantly influences characteristics particles at air–liquid interface, while with larger tend concentrate in center jet. Consequently, cavitation's impact is more pronounced case smaller-sized particles. Moreover, revealed that can either exacerbate high concentration or mitigate when low. investigation highlighted variations degree affected area based position angles. Particularly, angle 65°, presence water vapor induced alters trajectories, thereby modifying overall pattern These collectively contribute deeper understanding complex interplay between

Language: Английский

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Investigation on the effect of particle parameters on the erosion and erosion prediction model of the Pelton turbine

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(4)

Published: April 1, 2024

The Pelton turbine will play a massive role in China's water conservancy and power generation development process. In practical engineering applications, sediment erode the components of when they come into contact, threatening safe stable operation unit. Therefore, based on Eulerian–Lagrangian method, this study analyzes effects particle size, concentration, position angle degree distribution erosion each component without considering cavitation effect flow. results show that larger more concentrated distribution, severe abrasion caused spray needle bucket. However, nozzle weakens, area increases. It was also found higher to component. When jet completely hits bucket, due low impact speed, remains almost unchanged, resulting less erosion. Finally, classic Finnie model refined by adjusting average rate, rotation angle. This modification yielded an enhanced model, mainly showcasing improved performance for moderate sizes.

Language: Английский

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Effect and mechanism of erosion in Pelton turbine and case studies—A review

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(3)

Published: March 1, 2024

Pelton turbines are widely used in hydropower stations located mountainous regions, especially with water head drop of more than 2000 m. Due to the complex structure and working principle turbine, flow is complicated reaction turbines, making numerical simulation difficult. The impulse action causes occurrence erosion phenomena which will directly decrease hydraulic efficiency reduce turbine's life. For investigating characteristics, computational fluid dynamics on variegated platforms according their unique advantage. Thus, different introduced compared solving multi-phase using a discrete element method or other meshless methods. In addition, mechanism studied classified aspects such as impact angle velocity. However, unlike feasibility simulations, experimental work still challenging reproduce. Furthermore, state research discussed by listing various major facilities operation comparing methods analysis. Case studies all over world provide very rich database patterns would be highly useful validation verification results. Studies have shown that particle parameters, size, concentration, shape, velocity, interaction between particles material surfaces, significantly turbines. response this erosion, upgrading materials implementing geometric optimization proven effective strategies.

Language: Английский

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Numerical Assessment of the Hydrodynamic Excitation Characteristics of a Pelton Turbine

Sustainability, Journal Year: 2024, Volume and Issue: 16(23), P. 10667 - 10667

Published: Dec. 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.

Language: Английский

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