Now showing items 1-20 of 62

    • A river bed hydrokinetic turbine: a laminated composite material rotor design 

      Oller Aramayo, Sergio A.; Nallim, Liz G.; Oller Martínez, Sergio Horacio; Martínez García, Javier (International Centre for Numerical Methods in Engineering (CIMNE), 2017)
      Book
      Open Access
      This chapter presents the composite materials applied to Water Current Turbine (WCT) hydrokinetic turbines. Here will be briefly described the features of these turbines, the fluid-dynamic behavior of the rotor, and its ...
    • 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
      Open Access
      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 ...
    • Added mass effects of attached cavitation on the blades of a Francis runner 

      Huang, Xingxing; Escaler Puigoriol, Francesc Xavier (2016)
      Conference report
      Open Access
    • Added mass effects on a Francis turbine runner with attached blade cavitation 

      Huang, Xingxing; Escaler Puigoriol, Francesc Xavier (Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-11)
      Article
      Open Access
      To 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 ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • An integrated procedure for the structural design of a composite rotor-hydrofoil of a Water Current Turbine (WCT) 

      Oller Aramayo, Sergio A.; Nallim, Liz G.; Oller Martínez, Sergio Horacio (2013-12)
      Article
      Restricted access - publisher's policy
      This paper shows an integrated structural design optimization of a composite rotor-hydrofoil of a water current turbine by means the finite elements method (FEM), using a Serial/Parallel mixing theory (Rastellini et al. ...
    • Analysis of the dynamic response of pump-turbine runners. Part I: Experiment 

      Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, François (IOPScience, 2012)
      Conference lecture
      Restricted access - publisher's policy
      When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this ...
    • Assessment of remote cavitation detection methods with flow visualization in a full scale francis turbine 

      Escaler Puigoriol, Francesc Xavier; Vilberg, Ingrid; Ekanger, Jarle; Francke, H; Kjeldsen, Morten (2018)
      Conference report
      Open Access
      This paper describes the experimental investigations carried out in the Francis turbine at Svorka power plant operated by Statkraft in Norway. The unit, with a head of 260 m, can deliver a maximum output load of 25 MW. The ...
    • Cavitation effects on the structural resonance of hydraulic turbines: Failure analysis in a real francis turbine runner 

      Liu, Xin; Luo, Yongyao; Presas Batlló, Alexandre; Wang, Zhengwei; Zhou, Lingjiu (2018-09-03)
      Article
      Open Access
      When discussing potential resonances in hydraulic turbine runners, cavitation effects are usually neglected. Nevertheless, recent studies have experimentally proved, that large cavitation volumes in the proximity of flexible ...
    • 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)
      Conference report
      Open Access
      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 ...
    • CFD study of the Rotor-Stator Interaction in a Francis turbine 

      Herranz Tomás, Jordi (Universitat Politècnica de Catalunya, 2016-04-26)
      Bachelor thesis
      Open Access
      En el següent treball de fi de grau, el qual forma part d'un projecte dirigit pel CDIF (Centre de Diagnòstic Industrial i Fluïdodinàmica), es pretén realitzar l'estudi del model geomètric d'un prototip real d'una turbina ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Condition monitoring of pump-turbines. New challenges 

      Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Presas Batlló, Alexandre; Rodriguez Godoy, Cristian (2015-05)
      Article
      Open Access
      At present, pumped storage is the only system to store huge amounts of energy. The surplus of energy in the electrical grid is used for pumping water from a lower to a higher reservoir (pump operation). At peak hours or ...
    • Crack growth analysis and fatigue life estimation in the piston rod of a Kaplan hydro turbine 

      Liu, Xin; Presas Batlló, Alexandre; Luo, Yongyao; Wang, Zhengwei (2018-11)
      Article
      Open Access
      Linear elastic fracture mechanics (LEFM) approaches are seldom used to analyze fatigue problems in hydraulic turbomachinery, where extremely simplified fatigue models are normally considered. In one of the largest Kaplan ...
    • Desarrollo de método de diagnóstico de daños en turbinas hidráulicas 

      Elizalde Ramos, Alberto (Universitat Politècnica de Catalunya, 2020-01-31)
      Bachelor thesis
      Open Access
      El factor de estrés más elevado en las turbinas-bombas, viene producido por la interacción entre el rotor y el estator, conocida dicha interacción como RSI (de sus siglas en ingles Rotor Stator Interaction). ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Detection of hydraulic phenomena in francis turbines with different sensors 

      Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-19)
      Article
      Open Access
      Nowadays, 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 ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Effects of attached blade cavitation on the natural frequencies of a Francis runner 

      Escaler Puigoriol, Francesc Xavier; Huang, Xinxing (Shanghai University Press, 2019)
      Conference report
      Open Access
      Effects of attached blade cavitation on the natural frequencies of a Francis runner
    • Estudi amb CFD de la cavitació en una turbina Francis 

      Coma Solanas, Martí (Universitat Politècnica de Catalunya, 2020-01-31)
      Bachelor thesis
      Open Access
      La finalitatd’aquest treball de fi de grau és estudiar mitjançant tècniques de mètodes numèrics els efectes produïts per l’aparició de cavitació en una turbina Francis. Per tal de reduir el cost computacional ...