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Transposition of the mechanical behavior from model to prototype of Francis turbines
(Elsevier, 2020-06-01)
Article
Restricted access - publisher's policyHydropower is nowadays essential for balancing the electrical grid providing flexibility and fast response. The role of hydraulic turbines has changed from working at their Best Efficiency Point (BEP) to work in the whole ... -
Presa de Caruachi. Estudio del comportmiento hidráulico de las compuertas de los conductos de desvío
(2002-07)
Article
Open AccessSe presenta el estudio desarrollado en el Laboratorio de Modelos Reducidos del Dpto. de Ing. Hidráulica, Marítima y Ambiental de la UPC, para el análisis del comportamiento hidráulico de las compuertas a utilizar en la ... -
Experimental investigation on synthesis, characterization, stability, thermo-physical properties and rheological behavior of MWCNTs-kapok seed oil based nanofluid
(2019-03-01)
Article
Open AccessSeveral researchers devoted their efforts for the thermal conductivity enhancement of Carbon Nanotubes (CNTs) based nanofluids as CNTs have excellent thermal properties. However, limited research is reported on the detailed ... -
Assessment of RANS turbulence models and Zwart cavitation model empirical coefficients for the simulation of unsteady cloud cavitation
(Engineering Applications of Computational Fluid Mechanics, 2019-11-26)
Article
Open AccessThe numerical simulation of unsteady cavitation flows is sensitive to the selected models and associated parameters. Consequently, three Reynolds Average Navier-Stokes (RANS) turbulence models and the Zwart cavitation model ... -
Synchronous condenser operation in Francis turbines: Effects in the runner stress and machine vibration
(Elsevier, 2020-02-01)
Article
Restricted access - publisher's policyReactive power shortage is one of the current issues that endanger the stability of the power grid systems. Some massive blackouts have been experienced in the past years due to the unbalance of reactive power. One of the ... -
Experimental measurements of the natural frequencies and mode shapes of rotating disk-blades-disk assemblies from the stationary frame
(Multidisciplinary Digital Publishing Institute, 2019-09-14)
Article
Open AccessDetermining the natural frequencies and mode shapes of rotating turbomachinery components from both rotating and stationary reference frames is of paramount importance to avoid resonance problems that could affect the ... -
Detection of hydraulic phenomena in francis turbines with different sensors
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-19)
Article
Open AccessNowadays, 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. Hydraulic turbines are therefore ... -
Influence of the hydrodynamic damping on the dynamic response of Francis turbine runners
(2019-10-01)
Article
Restricted access - publisher's policyThe 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 ... -
Scale-adaptive simulation of unsteady cavitation around a naca66 hydrofoil
(Multidisciplinary Digital Publishing Institute, 2019-09-05)
Article
Open AccessDistances between consecutive aftershocks are analysed by means of mono- and multifractal theory with the aim of quantifying the complexity of the physical mechanism governing them, as well as their predictability and ... -
Numerical investigation into the influence on hydrofoil vibrations of water tunnel test section acoustic modes
(2019-06-17)
Article
Restricted access - publisher's policyHigh-speed water tunnels are typically used to investigate the single-phase and two-phase flows around hydrofoils for hydraulic machinery applications but their dynamic behavior is not usually evaluated. The modal analysis ... -
Added mass effects on a Francis turbine runner with attached blade cavitation
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-11)
Article
Open AccessTo have a safe structural design, an analysis of the dynamic behavior of a Francis turbine runner with consideration of the added mass e ects of surrounding water is necessary during design phase. Both in design and at o ... -
Numerical Investigation into the Effect of Sound Speed in Attached Cavitation on Hydrofoil Modes of Vibration
(2019-05-09)
Article
Open AccessIt has been found recently that the dynamic behavior of a cavitating hydrofoil is di erent from that in pure water in that, not only are the natural frequencies di erent, but the mode shapes may also change. In order to ...
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