Enviaments recents

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  Numerical study on the dynamic behavior of a francis turbine runner model with a crack 

  Zhang, Ming; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Zhao, Weiqiang (2018-01-01)
  Article
  Accés obert

  Crack appearance in the blade is the most common type of fatigue damage in Francis turbines. However, it is sometimes difficult to detect cracks in time using the current monitoring system, even when they are very large. ...
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  Transmission of high frequency vibrations in rotating systems. Application to cavitation detection in hydraulic turbines 

  Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Multidisciplinary Digital Publishing Institute, 2018-03-16)
  Article
  Accés obert

  One of the main causes of damage in hydraulic turbines is cavitation. While not all cavitation appearing in a turbine is of a destructive type, erosive cavitation can severely affect the structure, thus increasing maintenance ...
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  Sensor-based optimized control of the full load instability in large hydraulic turbines 

  Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Multidisciplinary Digital Publishing Institute (MDPI), 2018-03-30)
  Article
  Accés obert

  Hydropower plants are of paramount importance for the integration of intermittent renewable energy sources in the power grid. In order to match the energy generated and consumed, Large hydraulic turbines have to work under ...
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  Numerical simulations of complex flows in hydraulic turbomachinery. Actual R&D lines in the ‘CFD/Applied Maths Laboratory’ 

  Coussirat Núñez, Miguel Gustavo; Fontanals García, Alfred (2016-07-01)
  Article
  Accés obert
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  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 ...
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  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 ...
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  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 ...
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  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 ...

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