Transient analysis of load rejection for a high-head Francis turbine based on structured overset mesh

Sun, Longgang; Guo, Pengcheng; Yan, J P

doi:10.1016/j.renene.2021.02.151

Cited by 23 publications

(5 citation statements)

References 34 publications

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“…As the single unit capacity of the hydroelectric generator continues to grow, the requirements for the safety and reliability of various components are also increasing [76]. The fault diagnosis technology of the hydroelectric generator based on sound signal vibration can provide more unit status for the current diagnosis and detection system and improve the hydroelectric generator's fault diagnosis and early warning capability.…”

Section: Discussion About Research Directions and Prospectsmentioning

confidence: 99%

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

et al. 2021

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The health of the hydroelectric generator determines the safe, stable, and reliable operation of the hydropower station. In order to keep the hydroelectric generator in a better state of health and avoid accidents, it is crucial to detect its faults. In recent years, fault detection methods based on sound and vibration signals have gradually become research hotspots due to their high sensitivity, achievable continuous dynamic monitoring, and easy adaptation to complex environments. Therefore, this paper is a supplement to the existing state monitoring and fault diagnosis system of the hydroelectric generator; it divides the hydroelectric generator into two significant parts: hydro-generator and hydro-turbine, and summarizes the research and application of fault detect technology based on sound signal vibration in hydroelectric generator and introduces some new technology developments in recent years, and puts forward the existing problems in the current research and future development directions, and it is expected to provides some reference for the research on fault diagnosis of the hydroelectric generator.

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Section: Discussion About Research Directions and Prospectsmentioning

confidence: 99%

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

et al. 2021

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“…Research by Sun et al (2021), regarding the principal objective of this paper is to present the numerical investigation into load rejection towards a high-head model Francis turbine based on the structured overset mesh, which provides greater flexibility over the standard mesh techniques and adequate mesh quality during the movement of the guide vanes. The numerical results show good agreement with experimental measurements.…”

Section: Literature Reviewmentioning

confidence: 99%

New Design of A Micro-Hydro Power Plant (MHPP) System In The 3T Region As Al-ternative Solution Unit Turbine Using Computational Fluid Dynamics (CFD) Simulation

Jarrar Pirzada,

Kurniawan,

Nababan

et al. 2024

Eduvest

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This research aims to select the most suitable type of water turbine for the micro-hydro power plant (PLTMH) site in the Anggi District, Pegunungan Arfak Regency, West Papua Province. The study also aims to design the most optimal and effective turbine in terms of technical aspects and generator system reliability. This objective is directed towards providing recommendations for the development of the second unit of PLTMH Anggi in a more comprehensive manner rather than relying solely on expert recommendations without thorough analysis. The data used in this research was obtained from field surveys and secondary data sources. The initial step in selecting the turbine type involves manual turbine design calculations, taking into consideration parameters such as water flow, head height, and hydraulic efficiency. Based on these calculation results, the "Francis" turbine type was chosen as the preferred option, differing from the existing Propeller Tubular Type-S turbine installed in Unit 1. The selected turbine, "Francis," was then modeled using computational fluid dynamics (CFD) simulations with the Ansys Fluent software. These simulations provide computer-generated data on hydrodynamic characteristics, pressure distribution, and flow velocity around the turbine under various operational conditions. This research has significant implications for improving the efficiency and reliability of the micro-hydro power plant system for the optimal power and efficiency development of Unit 2.

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“…Sun L and others conducted unsteady numerical calculations and visualization experiments of turbine flow fields, researching the evolution and pressure pulsation characteristics of blade passage cavitation vortices under partial-load conditions. The results indicated that changes in the volume of cavitation vortices primarily occur near the junction of the trailing edge of the turbine blade back and the lower ring, subsequently inducing local amplification of pressure pulsation magnitudes [17].…”

Section: Introductionmentioning

confidence: 98%

Testing and Numerical Analysis of Abnormal Pressure Pulsations in Francis Turbines

Jia,

Zeng,

Liu

et al. 2024

Energies

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During the flood season, Francis turbines often operate under low-head and full-load conditions, frequently experiencing significant pressure pulsations, posing potential threats to the safe and stable operation of the units. However, the factors contributing to substantial pressure pulsations in Francis turbines are multifaceted. This paper focuses on a mixed-flow hydroelectric generating unit at a specific hydropower station. Field tests were conducted to investigate abnormal vibrations and hydraulic pressure pulsations under low-head and full-load conditions. Utilizing the Navier–Stokes equations and the RNG k-ε turbulence model, the unsteady flow field within the turbine under these conditions was calculated. The results indicate that the abnormal pressure pulsations detected in the bladeless zone between the wicket gates and the turbine inlet are due to operational points deviating from the normal operating range of the turbine. When water flows at a large inflow angle, striking the turbine blade heads, it leads to significant flow separation and vortex formation at the back of the blade inlet edges, causing severe vibrations in the hydroelectric generating unit. These findings provide a basis and assurance for the safe and stable operation of the power station.

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Transient analysis of load rejection for a high-head Francis turbine based on structured overset mesh

Cited by 23 publications

References 34 publications

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

New Design of A Micro-Hydro Power Plant (MHPP) System In The 3T Region As Al-ternative Solution Unit Turbine Using Computational Fluid Dynamics (CFD) Simulation

Testing and Numerical Analysis of Abnormal Pressure Pulsations in Francis Turbines

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