Results 1 to 10 of about 2,207,326 (232)
Journal of Marine Science and Engineering, 2023 Runaway is a common phenomenon in pump-turbines for hydropower and ocean power, accompanied by strong instability, which can easily lead to accidents.
Di Zhu +4 more
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Journal of Marine Science and Engineering, 2022 Sediment erosion is a negative phenomenon for the water turbine. The purpose of this paper is to study the effect of the guide vane opening on the particle motion and sediment erosion in the band chamber using the Euler–Lagrangian approach.
Xijie Song +4 more
doaj +5 more sources
Analysis of flow and energy dissipation in pump turbine with small guide vane opening
Engineering Applications of Computational Fluid MechanicsIn this study, a detailed flow state analysis of a reversible pump turbine (RPT) under small guide vane opening conditions was conducted using both numerical simulation and experimental methods on three analysis planes at 0.5 span. The entropy production
Jiahao Lu +6 more
doaj +5 more sources
Water (Switzerland), 2022 In this paper, the Eulerian–Lagrangian method and Tabakoff erosion model are used to study the solid–liquid two-phase flow in a Francis turbine. Through the analysis of the overall flow pattern, particle flow, particle concentration, and wear in the bladeless area of the unit under different guide vane openings, the influence of runner radial gap flow ...
Xijie Song
exaly +3 more sources
Energies, 2022 This article presents a study on the performance characteristics of a Francis turbine operating with various guide vane openings to determine the best operating point based on unit quantities.
Megavath Vijay Kumar +8 more
doaj +4 more sources
Analysis of the Guide Vane Jet-Vortex Flow and the Induced Noise in a Prototype Pump-Turbine
Applied Sciences, 2019 The start-up process of a pump-turbine in pump mode is found with obvious noise, especially at the small guide vane opening angle. The turbulent-flow-induced noise is an important part and must be reduced by flow control.
Ran Tao, Zhengwei Wang
doaj +4 more sources
Flow Deflection between Guide Vanes in a Pump Turbine Operating in Pump Mode with a Slight Opening [PDF]
Energies, 2022 During the startup and shutdown processes of a reversible-pump turbine (RPT) working in pump mode, abnormal sounds and vibrations usually occur in the distributor when the guide vanes (GVs) are at a slight opening (max opening of about 6%). The objective
Qingfeng Ji +3 more
doaj +2 more sources
A FEM-Based Machine Learning Framework for Online Stress Field Estimation in Hydropower Regulating Rings [PDF]
SensorsData-driven surrogate methods are increasingly applied to real-time structural health monitoring of critical engineering systems, but their use is often limited by the computational cost of high-fidelity finite element (FEM) simulations.
Ronny Francis Ribeiro Junior +5 more
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AIP Advances, 2023 Pumped storage hydropower is perhaps the most reliable solution to the energy crisis, but its development and application are limited by hydraulic instability, such as S-shaped characteristics.
Shujiao Pang +3 more
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Dynamic Simulation in Guide Vane Opening Process of a Pump-Turbine in Pump Mode
Journal of Applied Fluid Mechanics, 2017 During the process of switching conditions in pump-turbine, unstable flow would take place and seriously impact on the stability and safety. This paper deals with the guide vanes’ moving process in pump mode through unsteady numerical simulations. Dynamic
L. Han +5 more
doaj +2 more sources