Numerical Assessment of the Hydrodynamic Excitation Characteristics of a Pelton Turbine DOI Open Access
Longgang Sun,

Wenrui Fan,

Hengte Zhou

et al.

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

Investigation on the effect of particle parameters on the erosion and erosion prediction model of the Pelton turbine DOI Creative Commons
Lei Han, Chuanliang Guo, Yujie Gao

et al.

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

Citations

5
Suppression of unsteady cavitation around oscillating hydrofoils using spanwise obstacles near trailing edge DOI
Huafeng Li, Shuaijun Li, Pengzhong Wang

et al.

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 136754 - 136754

Published: May 1, 2025

Language: Английский

Citations

0
Numerical Assessment of the Hydrodynamic Excitation Characteristics of a Pelton Turbine DOI Open Access
Longgang Sun,

Wenrui Fan,

Hengte Zhou

et al.

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

Citations

1