Results 1 to 10 of about 3,196 (140)
On the Rotating Vortex Rope and Its Induced Structural Response in a Kaplan Turbine Model
Energies, 2022 The rotating vortex rope, which can be decomposed in the rotating and the plunging modes, is the origin of pressure fluctuations in the draft tube cone when hydraulic turbines operate at part load, compromising the structural integrity and limiting the ...
Rafel Roig +4 more
doaj +3 more sources
An Indirect Measurement Methodology to Identify Load Fluctuations on Axial Turbine Runner Blades [PDF]
Sensors, 2020 Smooth integration of intermittent energy sources, such as solar and wind power, into the electrical grid induces new operating conditions of the hydraulic turbine by increasing the off-design operations, start/stops, and load variations.
Arash Soltani Dehkharqani +3 more
doaj +2 more sources
Power Swing Generated in Francis Turbines by Part Load and Overload Instabilities [PDF]
Energies, 2017 Hydropower plays a key role in the actual energy market due to its fast response and regulation capacity. In that way, hydraulic turbines are increasingly demanded to work at off-design conditions, where complex flow patterns and cavitation appear ...
David Valentín +5 more
doaj +4 more sources
Detection of hydraulic phenomena in francis turbines with different sensors [PDF]
Sensors (Basel), 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.
Egusquiza Estévez, Eduard +4 more
core +3 more sources
An Overview of Active Control Techniques for Vortex Rope Mitigation in Hydraulic Turbines
Energies, 2023 This review addresses the current state of research into active control and suppression of vortex rope in hydroturbines under off-design operating conditions.
Sergey Shtork +4 more
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Sensor-based optimized control of the full load instability in large hydraulic turbines [PDF]
Sensors (Basel), 2018 Hydropower plants are of paramount importance for the integration of intermittent renewable energy sources in the power grid. In order to match the energy generated and consumed, Large hydraulic turbines have to work under off-design conditions, which ...
Egusquiza Estévez, Eduard +4 more
core +3 more sources
Flow Evolution and Energy Loss Mechanism in Accidental Shutdown Process of a Large Submersible Mixed-Flow Pump System [PDF]
Journal of Applied Fluid Mechanics, 2023 To investigate the accidental shutdown process for a large vertical and submersible mixed-flow pump unit in a drainage pumping station, a three-dimensional numerical method for this transition process was proposed according to the angular momentum ...
B. Zhu, W. Han, Z. Tai, Y. Chen
doaj +1 more source
Machines, 2023 The existence of vortex ropes inside the draft tube significantly impacts hydraulic efficiency and operational stability, and few studies on the formation mechanism of vortex ropes and hydraulic loss problems have been explored.
Haobo Wang +3 more
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Energies, 2022 The present paper demonstrates a proof-of-concept by introducing a variable guide vane system in the draft tube of a high-head Francis model turbine. The aim is to examine the hydraulic performance of the turbine while mitigating the pressure pulsations ...
Jesline Joy +2 more
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Energies, 2022 The role of hydropower has become increasingly essential following the introduction of intermittent renewable energies. Quickly regulating power is needed, and the transient operations of hydropower plants have consequently become more frequent.
Raluca Gabriela Iovănel +3 more
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