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.
, Ruofu Xiao, Xiao Ruofu
exaly +4 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 ...
Jiayi Cui, Lingfeng Shu, Chun Xiang
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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, Pavel Rudolf
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Active flow control of the vortex rope and pressure pulsations in a swirl generator [PDF]
Engineering Applications of Computational Fluid Mechanics, 2017 The vortex rope and pressure pulsations caused by a radial pressure gradient in the conical diffuser of a swirl generator is controlled using continuous slot jets with different momentum fluxes and angles injected from the runner crown.
Ardalan Javadi, Håkan Nilsson
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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.
S I Shtork, D A Suslov, I V Litvinov
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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
doaj +2 more sources
Applied Sciences (Switzerland), 2021 The flow in a Francis turbine at full load is characterised by the development of an axial vortex rope in the draft tube. The vortex rope often promotes cavitation if the turbine is operated at a sufficiently low Thoma number.
Jean Decaix +2 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
doaj +2 more sources
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
doaj +2 more sources
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 +4 more sources