Results 31 to 40 of about 650 (181)
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
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Financial Management, EarlyView.ABSTRACT We examine how mergers and acquisitions (M&As) enable firms to adapt to climate policy shocks. Exploiting the adoption of the Nitrogen Oxides (NOx) Budget Trading Program (NBP) across US states as an exogenous shock, we find that firms with NOx‐emitting plants subject to the NBP are more likely to engage in M&As, particularly through vertical ...
Samer Adra +3 more
wiley +1 more source
Flow-Induced Strength Analysis of Large Francis Turbine Under Extended Load Range
Applied SciencesTo meet the load requirements of the power grid, the hydroelectric power plants need to extend the operational load range of the turbine units, which are often operated under off-design operating conditions.
Xingping Liu +3 more
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Do not be Afraid of Small High-Speed Francis Turbines
Journal of Mechanical Engineering, 2018 In the first quarter of the last century hydraulic power plants were equipped with high-speed Francis turbines even in the situation when a contemporary project manager would suggest Kaplan turbine. The reason is simple. Mr.
Libor Koudelka
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Dam Management in the Era of Climate Change
Mathematical Finance, EarlyView.ABSTRACT Climate change has a dramatic impact, particularly by concentrating rainfall into a few short periods, interspersed with long dry spells. In this context, the role of dams is crucial. We consider the optimal control of a dam, where the water level must neither exceed a designated safety threshold nor fall below a minimum level to ensure ...
Cristina Di Girolami +3 more
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EnergiesSecondary flows in Francis turbines are induced by the presence of a gap between guide vanes and top–bottom covers and rotating–stationary geometries. The secondary flow developed in the clearance gap of guide vanes induces a leakage vortex that travels ...
Nirmal Acharya +4 more
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Detection of Hydraulic Phenomena in Francis Turbines with Different Sensors [PDF]
Sensors, 2019 Nowadays, hydropower is demanded to provide flexibility and fast response into the electrical grid in order to compensate the non-constant electricity generation of other renewable sources. Hydraulic turbines are therefore demanded to work under off-design conditions more frequently, where different complex hydraulic phenomena appear, affecting the ...
Valentín Ruiz, David +4 more
openaire +4 more sources
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 15, 16 August 2026.Abstract Near‐surface wind regimes govern critical Earth system processes including dust mobilization, ocean mixing, and wildfire spread, yet their multi‐decadal evolution under anthropogenic forcing remains poorly constrained. Here we quantify extreme wind frequency changes (1981–2024) using ERA5‐Land reanalysis with a monthly aggregation approach ...
Adil Salhi, Essam Heggy
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Advances in Mechanical EngineeringBased on the velocity similarity theory, a test system for sediment wear flow around Francis turbine runner blades was established. The sediment wear test was carried out on the surface of Francis turbine runner blades with severe sediment wear before ...
Bing Yao +6 more
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The Dynamic Characteristics and Control of a Hydraulic Turbine
Measurement + Control, 1969 A dynamic model of a radial flow turbine was derived. The model was verified by tests on an experimental 5 hp Francis type turbine. The tests indicate that the model is adequate for control system design.
I. Djordjevic Dipl.Ing +3 more
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