Ponències/Comunicacions de congressos

Enviaments recents

  • CFD study of the effects of ingested bodies on the RSI of hydraulic turbines 

    Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (2018)
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    The ingestion of large bodies in hydraulic turbines can produce blockage in the runner and/or the distributor, modifying the amplitude and uniformity of pressure pulsations and generating large ...

  • Detection and analysis of part load and full load instabilities in a real Francis turbine prototype 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (Institute of Physics (IOP), 2017)
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    Francis turbines operate in many cases out of its best effici ency point, in order to regulate their output power according to the instantaneous ener gy demand of the grid. Therefore, it is of paramount importance to analyse ...

  • Overview of the experimental tests in prototype 

    Egusquiza Estévez, Eduard; Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen (Institute of Physics (IOP), 2017)
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    Experimental tests in prototype are necessary to understand the dynamic behaviour of the machine during different operating points. Hydraulic phenomena as well as its effect on the structure need to be studied in o rder ...

  • Dynamic response of the MICA runner. Experiment and simulation 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Bossio, Matias (Institute of Physics (IOP), 2017)
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    Studying the dynamic response of Francis turbine runners is of paramount importance in order to avoid resonance problems during operating conditions. For this purpose, the natural frequencies as well as their associated ...

  • Condition monitoring of a prototype turbine. Description of the system and main results 

    Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Bossio, Matias (Institute of Physics (IOP), 2017)
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    The fast change in new renewable energy is affecting directly the required operating range of hydropower plants. According to the present demand of electricity, it is necessary to generate different levels of power. Because ...

  • Advanced condition monitoring of Pelton turbines 

    Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Bossio, Matias; Egusquiza Estévez, Eduard (2017)
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    Accés restringit per política de l'editorial
    The ability of hydropower to adapt the electricity generation to the demand is necessary to integrate wind and solar energy to the grid. Nowadays hydropower turbines are required to work under harsher operating conditions ...

  • On the use of PZT-Patches as exciters in modal analysis: application to submerged structures 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Bossio, Matias (Multidisciplinary Digital Publishing Institute (MDPI), 2016)
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    Modal Analysis is an experimental technique widely used to determine the dynamic response of structures. One of the most critical part is the selection of the actuator that will excite the tested structure. In many cases, ...

  • Influence of the boundary conditions on the natural frequencies of a Francis turbine 

    Valentín Ruiz, David; Ramos Martín, David; Bossio, Matias; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (Institute of Physics (IOP), 2016)
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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 non-rigid surfaces on the dynamic response of a submerged and confined disk 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2015)
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    Determining the dynamic response of submerged and confined disk-like structures is of interest in the hydraulic turbines field. Disks present similar dynamic characteristics than hydraulic turbine runners, especially in ...

  • Preliminary results on the assessment of using Venetian blinds as a solar thermal collector in double skin facades in Mediterranean climates 

    Guardo Zabaleta, Alfredo de Jesús; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Alavedra Ribot, Pere (2015)
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    The global trend on energy integration and building efficiency is making both researchers and developers look for technical solutions to use façade surfaces for electricity and/or domestic hot water production. These ...

  • Influence of the added mass effect and boundary conditions on the dynamic response of submerged and confined structures 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2014)
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    The dynamic response of submerged and confined disk-like structures is of interest in the flied of hydraulic machinery, especially in hydraulic turbine runners. This response is difficult to be estimated with accuracy due ...

  • Numerical investigation of unsteady cavitation around a NACA 66 hydrofoil using OpenFOAM 

    Escaler Puigoriol, Francesc Xavier (2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial

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