Jump rope vortex in liquid metal convection. [PDF]
Proc Natl Acad Sci U S A, 2018 Understanding large scale circulations (LSCs) in turbulent convective systems is important for the study of stars, planets and in many industrial applications.
Vogt T, Horn S, Grannan AM, Aurnou JM.
europepmc +8 more sources
Research on the Vortex Rope Control Techniques in Draft Tube of Francis Turbines
Energies, 2022 Francis turbines are most widely used in hydropower due to their characteristics which include a fast response and wide time-scale operation. The vortex rope inside Francis turbines is a common flow phenomenon, which always causes strong vibration ...
Lei Wang +6 more
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Temporal and Spatial Analysis on the Fractal Characteristics of the Helical Vortex Rope
Fractal and Fractional, 2022 Vortex rope is a common phenomenon in the draft tube of hydraulic turbines. It may cause strong pressure pulsation, noise, and strong vibration of the unit especially when it is helical. Therefore, the study of vortex rope is of great significance.
Puxi Li +4 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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Application of Computer Graphics Flow Visualization Methods in Vortex Rope Investigations [PDF]
Energies, 2021 Computer graphics visualization techniques for application on data from Computational Fluid Dynamics (CFD) simulations of the vortex rope, a phenomenon present in hydraulic turbines operating in off-design conditions, were devised. This included not only
Ondřej Urban +2 more
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Vortex rope instabilities in a model of conical draft tube [PDF]
EPJ Web of Conferences, 2017 We report on experimental studies of the formation of vortex ropes in a laboratory simplified model of hydroturbine draft tube. Work is focused on the observation of various flow patterns at the different rotational speed of turbine runner at fixed flow ...
Skripkin Sergey +3 more
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Multiscale investigation of cavitation surge characteristics in the swirling flow using Eulerian-Lagrangian method [PDF]
Ultrasonics SonochemistryHydrodynamic cavitation (HC) surge accompanied by strong swirl is widely present in fluid machinery and has become a hot topic in many engineering fields. This paper employed a two-way coupling Eulerian-Lagrangian multiscale cavitation modeling method to
Ziyang Wang +3 more
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Vortex rope patterns at different load of hydro turbine model [PDF]
MATEC Web of Conferences, 2017 Operation of hydraulic turbines beyond optimal conditions leads to formation of precessing vortex core in a draft tube that generates powerful pressure pulsations in a hydraulic system.
Skripkin Sergey +3 more
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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.
Valentín D +4 more
europepmc +4 more sources
Energy distribution and chaotic pressure pulsation analysis of vortex ropes in Francis-99
Engineering Applications of Computational Fluid MechanicsFrancis turbines, essential for stability in diverse operating conditions and variable-speed scenarios, encounter efficiency-compromising vortex rope formations in the draft tube, leading to substantial pressure fluctuations.
Puxi Li +5 more
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