Results 201 to 210 of about 184,150 (234)
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Study of vortex rope based on flow energy dissipation and vortex identification
Renewable Energy, 2022Ruofu Xiao, Puxi Li
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Study of vortex rope for the flow field pulsation law
Ocean Engineering, 2023Ruofu Xiao, Puxi Li
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Computational analysis of vortex rope in a hydroturbine of Tucuruí dam
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2020There is a relevant hydraulic potential in Amazon rivers, from which it is generated most of the energy available for the largest part of Brazil. One of the most important hydropower plants in the Amazon is Tucurui dam, which can produce 8370 MW through Francis turbines.
Giordane J. Antunes Junior +3 more
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Experimental Investigation Of Couple Precessing Vortex Ropes In A Hydraulic Vortex
Siberian Journal of Physics, 2016The work is devoted to the experimental study of the interaction of the precessing vortex pair in the hydrodynamic vortex chamber. Swirling flow was created by a 12 tangentially directed rectangular nozzles. Design swirl number was varied in the range 0÷6.6 based on the geometry of the swirl device.
Sergey Skripkin +3 more
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Numerical Simulation of the Rotating Vortex Rope with Code_Saturne
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019The paper presents numerical simulations of the rotating vortex rope (RVR) inside a Francis turbine draft tube. The computational fluid dynamics (CFD) calculations were carried out using the Code_Saturne software. The geometry of the turbine was obtained from the Francis-99 workshops. The mesh files provided for the Francis-99 workshop II were modified
Robert Mitrut +3 more
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Simulations and Measurements of Pressure Oscillations Caused by Vortex Ropes
Journal of Fluids Engineering, 2006Pressure oscillations caused by vortex rope were measured in the draft tube of a prototype Francis turbine. The three-dimensional, unsteady Reynolds-averaged Navier-Stokes equations with the RNG κ−ϵ turbulence model were solved to model the flow within the entire flow path of the prototype hydraulic unit including the guide vanes, the runner, and the ...
Zhengwei Wang, Lingjiu Zhou
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Effect of water jet area on mitigation of vortex rope in a Francis turbine
Physics of Fluids, 2023The rotating vortex rope (RVR) is normally formed at part load operating conditions, which develops flow instability in the draft tube (DT) cone of a Francis turbine. The detrimental effects of RVR reduce the life and performance of the turbine. The present work mitigates RVR through axial water jet injection in the DT cone.
Sandeep Kumar, Bhupendra K. Gandhi
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Spatio-temporal evolution mechanism of cavitation vortex ropes in a swirling flow
Physics of Fluids, 2021Cavitation vortex rope widely occurs in hydraulic machinery, leading to the decrease in performance characteristic and increase in pressure fluctuation. The objective of this study was to explore the generation and transformation of cavitation vortex ropes in a swirling flow.
Deyou Li +4 more
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Model for Vortex Rope Dynamics in Francis Turbine Outlet
1996The present communication deals with the simulation of the vortex rope present in the outlet of a Francis turbine when operating at partial load regimes This approach is not devoted to the analysis of a complete turbomachinery system but rather to develop a rigorous mathematical analysis for a local phenomenon of practical relevance, We synthesise the ...
G. Pedrizzetti, G. Angelico
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Vortex Rope Formation in a High Head Model Francis Turbine
Journal of Fluids Engineering, 2017Francis turbine working at off-design operating condition experiences high swirling flow at the runner outlet. In the present study, a high head model Francis turbine was experimentally investigated during load rejection, i.e., best efficiency point (BEP) to part load (PL), to detect the physical mechanism that lies in the formation of vortex rope. For
Rahul Goyal +2 more
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