Enviaments recents

  • Extension of operating range in pump-turbines. Influence of head and load 

    Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre; Valentín Ruiz, David; Bossio, Matias (2017-12-19)
    Article
    Accés obert
    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 ...
  • Advanced condition monitoring of Pelton turbines 

    Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Bossio, Matias (2018-04)
    Article
    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 into the electrical grid. Nowadays, hydropower turbines are required to work under harsher operating ...
  • Feasibility of detecting natural frequencies of hydraulic turbines while in operation, using strain gauges 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Bossio, Matias; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (Multidisciplinary Digital Publishing Institute (MDPI), 2018-01-10)
    Article
    Accés obert
    Nowadays, hydropower plays an essential role in the energy market. Due to their fast response and regulation capacity, hydraulic turbines operate at off-design conditions with a high number of starts and stops. In this ...
  • Power swing generated in Francis turbines by part load and overload instabilities 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Bossio, Matias (2017-12-13)
    Article
    Accés obert
    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 ...
  • Assessment of the use of Venetian blinds as solar thermal collectors in double skin facades in Mediterranean climates 

    Velasco Vilanova, Abel; Jiménez García, Sergi; Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred; Egusquiza Montagut, Mònica (2017-11-10)
    Article
    Accés obert
    The global trend on energy integration and building efficiency is making both researchers and building developers look for technical solutions to use facade surfaces for energy harvesting. In this work, the assessment ...
  • Failure investigation of a Pelton turbine runner 

    Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre (Elsevier, 2017-11)
    Article
    Accés restringit per política de l'editorial
    In this paper, an uncommon failure of a Pelton turbine has been analyzed. After the monitoring system detected a sudden increase in the vibration levels, the turbine was inspected. The inspection showed that a fragment of ...
  • Computational fluid dynamics modeling of impinging gas-jet systems: II. Application to an industrial cooling system device 

    Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Valero Ferrando, Ma. del Carmen (2005-07-15)
    Article
    Accés restringit per política de l'editorial
    A numerical analysis of the flow behavior in industrial cooling systems based on arrays of impinging jets has been performed, using several eddy viscosity models to determine their modeling capabilities. For the cooling ...
  • Computational fluid dynamics modeling of impinging gas-jet systems: I. Assessment of eddy viscosity models 

    Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Escaler Puigoriol, Francesc Xavier (2005-07-15)
    Article
    Accés restringit per política de l'editorial
    Computational fluid dynamics plays an important role in engineering design. To gain insight into solving problems involving complex industrial flows, such as impinging gas-jet systems (IJS), an evaluation of several eddy ...
  • Accurate determination of the frequency response function of submerged and confined structures by using PZT-patches 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Bossio, Matias (2017-03-22)
    Article
    Accés obert
    To accurately determine the dynamic response of a structure is of relevant interest in many engineering applications. Particularly, it is of paramount importance to determine the Frequency Response Function (FRF) for ...
  • Study of available turbulence and cavitation models to reproduce flow patterns in confined flows 

    Coussirat Núñez, Miguel Gustavo; Moll, Flavio; Cappa, E. Franco; Fontanals García, Alfred (2016-09)
    Article
    Accés restringit per política de l'editorial
    Cavitating flow in nozzles is a complex flow which implies a highly turbulent two-phase one. An accurate simulation which improves some numerical results found in the literature was achieved by means of an extensive ...
  • Experimental study of a vibrating disk submerged in a fluid-filled tank and confined with a nonrigid cover 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica (2017-04-01)
    Article
    Accés restringit per política de l'editorial
    Determining the dynamic response of submerged and confined disklike structures is of interest in engineering applications, such as in hydraulic turbine runners. This dynamic response is heavily affected by the added mass ...
  • Dynamic response of a rotating disk submerged and confined. Influence of the axial gap 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2016-04-01)
    Article
    Accés restringit per política de l'editorial
    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 ...

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