Study of Pressure Shock Caused by a Vortex Ring Separated From a Vortex Rope in a Draft Tube Model
Journal of Fluids Engineering, 2017Operating hydraulic turbines under part- or over-load conditions leads to the development of the precessing vortex rope downstream of the turbine runner. In a regime close to the best efficiency point (BEP), the vortex rope is very unstable because of the low residual swirl of the flow.
S. G. Skripkin +3 more
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Two-Dimensional Numerical Simulation of Vortex Shedding of Multiple Stranded Ropes
Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, 2019Abstract The stranded rope is one of the important components of the fishery aquaculture equipment. We investigate the fluid flow through two-dimensional stranded rope by direct simulation of the Navier-Stokes equations. We show that for different kinds of stranded rope structures, there are significant differences in hydrodynamic ...
Xinxin Wang +4 more
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Numerical simulation of pressure pulsations caused by a precessing vortex rope
Izvestiya vysshikh uchebnykh zavedenii. FizikaFor numerical simulation of a vortex rope, the Reynolds-averaged Navier-Stokes equations closed by a two-parameter model of turbulent viscosity are considered. To approximate inviscid flows on cell faces, a Roe scheme with 3rd-order MUSCL-reconstruction and 5th-order WENO-reconstruction is used.
Alena R. Kocharina +3 more
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Numerical Analysis of Pulsating Water Jet Method for Mitigating the Vortex Rope
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Hydraulic machines, that operate at part load can suffer severe pressure fluctuations. These fluctuations vary in frequency and amplitude depending on the operating point. The cause of these changes in fluctuations, such as a 70% flow rate regime, is the appearance of the rotating vortex (vortex rope). Removing the rotating vortex is a problem that has
Constantin Tanasa +3 more
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Measurement of the Self-Oscillating Vortex Rope Dynamics for Hydroacoustic Stability Analysis
Journal of Fluids Engineering, 2015Flow instabilities in hydraulic machines often feature oscillating cavitation volumes, which locally introduce compliance and mass flow gain effects. These unsteady characteristics play a crucial role in one-dimensional stability models and can be determined through the definition of transfer functions for the state variables, where the cavitation ...
Andres Müller +5 more
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Flow-Feedback Method for Mitigating the Vortex Rope in Decelerated Swirling Flows
Journal of Fluids Engineering, 2013When reaction hydraulic turbines are operated far from the design operating regime, particularly at partial discharge, swirling flow instability is developed downstream of the runner, in the discharge cone, with a precessing helical vortex and its associated severe pressure fluctuations. Bosioc et al.
Constantin Tănasă +3 more
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Identification on Vortex Rope in Francis Turbine Draft Tube Based on Convkurgram
IEEE Transactions on Instrumentation and Measurement, 2022Huan Wang +7 more
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Study on Suppression of Cavitating Vortex Rope on Pump-Turbines by J-Groove
Applied Energy, 2023Shujiao Pang +3 more
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Recognition of the developing vortex rope in Francis turbine draft tube based on PSO-CS2
Renewable Energy, 2023Wenfeng Li, Yaochun Hou, Kelin Wu
exaly
Runner cone optimization to reduce vortex rope-induced pressure fluctuations in a Francis turbine
Science China Technological Sciences, 2021Deyou Li, Hongjie Wang, Xianzhu Wei
exaly