Results 1 to 10 of about 18,405 (147)
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
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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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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
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Fluids, 2023 The integration of intermittent renewable energy resources to the grid system requires that hydro turbines regularly operate at part-load conditions.
Mohammad Hossein Arabnejad +2 more
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Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine
Energies, 2017 Numerical simulations were performed to investigate pressure fluctuations in the S-shaped region of a pump-turbine model. Analyses focused on pressure fluctuations in the draft tube and in the gap between the guide vanes and runner.
Zijie Wang +3 more
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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
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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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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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Vortex rope mitigation with azimuthal perturbations: A numerical study
IOP Conference Series: Earth and Environment, 2021 A novel method to mitigate the rotating vortex rope is investigated numerically on a propeller turbine using ANSYS CFX. Pulsating momentum is injected in a horizontal plane in the diffuser cone from four evenly spaced jets.
H. Holmström +2 more
semanticscholar +1 more source