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Ara es mostren els items 17-36 de 96

    • Capability of structural-acoustical FSI numerical model to predict natural frequencies of submerged structures with nearby rigid surfaces 

      Rodríguez, Cristian; Flores, P.; Pierart, F.G.; Contzen, L.R.; Egusquiza Estévez, Eduard (2012-07-01)
      Article
      Accés restringit per política de l'editorial
      Structural–acoustical model is used in industry to determine natural frequencies of runners and impellers in hydraulic turbomachinery in the stage of design. In these calculations the fluid domain is considered with ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 ...

    • Characterization of the effects of ingested bodies on the rotor–stator interaction of hydraulic turbines 

      Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (2021-10-14)
      Article
      Accés obert
      Runner and distributor blockages in hydraulic turbines occur due to the ingestion of external bodies such as rocks or logs. These obstructions can change the amplitude and uniformity of the pressure pulsations in the ...

    • Comportament dinàmic de màquines hidràuliques 

      Egusquiza Estévez, Eduard (Edicions UPC, 2003)
      Llibre
      Accés restringit a la comunitat UPC
      Aquest llibre fa una anàlisi completa del comportament dinàmic/vibratori de màquines hidràuliques, des de les forces excitadores que actuen sobre la màquina fins a les vibracions finals generades. Està destinat tant a ...

    • 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 ...

    • 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 ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 

      Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      At present, new renewables like wind, solar and marine energy are having a strong development. The generation of energy by renewables has the disadvantage that it depends on atmospheric conditions. It means that they ...

    • 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
      Accés obert
      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 ...

    • Detailed study of the rotor-stator interaction phenomenon in a moving cascade of airfoils 

      Fontanals García, Alfred; Coussirat Núñez, Miguel Gustavo; Guardo Zabaleta, Alfredo de Jesús; Egusquiza Estévez, Eduard (2010)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In turbomachinery the Rotor-Stator Interaction (RSI) is an important phenomenon that has a strong influence on the machine behavior. These interactions can have a significant impact on the vibrational and acoustical ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 erosive cavitation on hydraulic turbines through demodulation analysis 

      Presas Batlló, Alexandre; Luo, Yongyao; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Wang, Zhengwei; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2018)
      Text en actes de congrés
      Accés obert
      Erosive cavitation in hydraulic turbines affects severely the runner structure, increasing maintenance costs and reducing the remaining useful life of the component. Actual vibro-acoustic techniques used to detect this ...

    • 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
      Accés obert
      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 ...

    • Diagnostics of a hydraulic turbine failure 

      Egusquiza Montagut, Mònica; Presas Batlló, Alexandre; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Xu, Beibei; Chen, Diyi; Egusquiza Estévez, Eduard (2022)
      Text en actes de congrés
      Accés obert
      This paper presents the failure analysis and diagnostic of a hydraulic turbine. Shortly after a maintenance revision the thrust bearing of the turbine was destroyed when the turbine was put into operation. The damaged ...

    • Dynamic analysis of Francis Runners-Experiment and numerical simulation 

      Lais, Stefan; Qwenguei, Liang; Henggeler, Urs; Weiss, Thomas; Escaler Puigoriol, Francesc Xavier; Egusquiza Estévez, Eduard (2009-10-01)
      Article
      Accés restringit per política de l'editorial

    • Dynamic model for axial motion of horizontal pelton turbine and validation in actual failure case 

      Rodriguez Godoy, Cristian Gabriel; Egusquiza Estévez, Eduard; Egusquiza Montagut, Mònica; Reyes, S.; Zambrano, D.; Tapia Ladino, Juan Antonio (2020-01-01)
      Article
      Accés obert
      Pelton turbines are important machines for power generation from a renewable energy source such as water. For power rates below 20 MW, the rotor of Pelton turbines is usually in horizontal position. Considering ideal ...

    • 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 obert
      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 ...

    • Dynamic response of Pelton runners: Numerical and experimental analysis in prototypes 

      Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard (Elsevier, 2020-09-01)
      Article
      Accés obert
      Worldwide electricity generation is featured by the growth of intermittent renewable energies. In this context, hydropower plays a fundamental role because it provides flexibility to the power grid and ensures its stability. ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 ...

    • El Diagnóstico de daños en grupos hidroeléctricos mediante el análisis de vibraciones 

      Egusquiza Estévez, Eduard; Nascimento, Luiz de Paula do; Valero Ferrando, Ma. del Carmen; Jou Santacreu, Esteban (1994)
      Article
      Accés obert
      El análisis del comportamiento vibratorio de Grupos Hidroeléctricos se puede utilizar para el diagnóstico del estado de la máquina. Se pretende detectar daños incipientes y poder seguir la evolución del estado de la máquina ...