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Numerical investigation of the effects of hydrofoil vibrations on the unsteady behavior of cavitation
(Institute of Physics (IOP), 2021)
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Text en actes de congrés.
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In order to better understand the fluid-structure interaction (FSI) in hydraulic machines, this study aims to numerically investigate the flow around an oscillating hydrofoil with special attention on the effect of ...
Fatigue life estimation of Francis turbines based on experimental strain measurements: Review of the actual data and future trends
(2019-03)
Article.
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Article.
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Due to the massive entrance of new renewable energies such as wind or solar, hydraulic turbines have to work far from its designed point and withstanding multiple transients, such as starts and stops, that shorten the ...
Large eddy simulation of partial cavitation around a 2D plane-convex hydrofoil
(2015-02-02)
Article.
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Article.
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Investigations of attached partial cavitation are important because to prevent damages in hydrulic machinery
and to reduce the costs. As expected computational fluid dynamics (CFD) methods have been developed for more ...
Extension of operating range in pump-turbines. Influence of head and load
(2017-12-19)
Article.
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Article.
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Due to the increasing share of new renewable energies like wind and solar in the generation of electricity the need for power regulation and energy storage is becoming of paramount importance. One of the systems to store ...
Dynamic response of a rotating disk submerged and confined. Influence of the axial gap
(2016-04-01)
Article.
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Article.
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In this paper, the natural frequencies and mode shapes of a rotating disk submerged and totally confined inside a rigid casing, have been obtained. These have been calculated analytically, numerically and experimentally ...
Influence of the boundary conditions on the natural frequencies of a Francis turbine
(Institute of Physics (IOP), 2016)
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Text en actes de congrés.
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Natural frequencies estimation of Francis turbines is of paramount importance in the stage of design in order to avoid vibration and resonance problems especially during transient events. Francis turbine runners are submerged ...
Influence of the hydrodynamic damping on the dynamic response of Francis turbine runners
(2019-10-01)
Article.
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Article.
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The dynamic behavior of Francis runners is of interest in the hydraulic machinery field since it is one of the most used type of hydraulic turbines for electricity generation. To evaluate the dynamic behavior of Francis ...
Power swing generated in Francis turbines by part load and overload instabilities
(2017-12-13)
Article.
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Article.
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Hydropower plays a key role in the actual energy market due to its fast response and regulation capacity. In that way, hydraulic turbines are increasingly demanded to work at off-design conditions, where complex flow ...
Natural frequencies of rotating disk-like structures submerged viewed from the stationary frame
(2021)
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Text en actes de congrés.
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To understand the effect of rotation in the dynamic response of pump-turbine runners, simplified models such as disk-like structures can be used. In previous researches the natural frequencies and mode shapes of rotating ...
On the detection of natural frequencies and mode shapes of submerged rotating disk-like structures from the casing
(2015-08)
Article.
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Article.
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To avoid resonance problems in rotating turbomachinery components such as impellers, it is of paramount importance to determine the natural frequencies of these parts when they are under operation. Nevertheless, most of ...