Recent Submissions

  • Failure investigation of a Kaplan turbine blade 

    Zhang, Ming; Valentin, David; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Elsevier, 2019-03-01)
    Article
    Restricted access - publisher's policy
    In this paper, an uncommon failure of a Kaplan turbine blade has been analyzed. After the monitoring system detected a sudden increase in vibration levels, the turbine was inspected. The inspection showed that a large crack ...
  • Experimental and Numerical Design and Evaluation of a Vibration Bioreactor using Piezoelectric Patches 

    Valentín Ruiz, David; Roehr, Charline; Presas Batlló, Alexandre; Heiss, Christian; Egusquiza Estévez, Eduard; Bosbach, Wolfram A. (Multidisciplinary Digital Publishing Institute (MDPI), 2019-01-21)
    Article
    Open Access
    n this present study, we propose a method for exposing biological cells to mechanical vibration. The motive for our research was to design a bioreactor prototype in which in-depth in vitro studies about the influence of ...
  • CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects 

    Mekala, Samuel Jedidiah; Fontanals García, Alfred; Guardo Zabaleta, Alfredo de Jesús (2019-01-01)
    Article
    Restricted access - publisher's policy
    Transesterification of triglycerides is a process by which biodiesel is produced. Biodiesel is a sustainable alternative to petroleum diesel; hence, its efficient production is of significant importance. The transesterification ...
  • A review of pzt patches applications in submerged systems 

    Presas, Alexandre; Luo, Yongyao; Wang, Zhengwei; Valentín Ruiz, David; Egusquiza Montagut, Mònica (Multidisciplinary Digital Publishing Institute (MDPI), 2018-07-12)
    Article
    Open Access
    Submerged systems are found in many engineering, biological, and medicinal applications. For such systems, due to the particular environmental conditions and working medium, the research on the mechanical and structural ...
  • Numerical study on the influence of acoustic natural frequencies on the dynamic behaviour of submerged and confined disk-like structures 

    Bossio, Matias; Valentín Ruiz, David; Presas Batlló, Alexandre; Ramos Martín, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica (2017-08)
    Article
    Open Access
    The dynamic response of disks has been deeply studied in the last years given that their dynamic characteristics present similarities with more complex disk-like structures used in real engineering applications, such as ...
  • 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
    Open Access
    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. ...
  • 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
    Open Access
    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 ...
  • 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
    Open Access
    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 ...
  • 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
    Open Access
  • 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
    Open Access
    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
    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 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
    Open Access
    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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