Recent Submissions

  • On the use of vibrational hill charts for improved condition monitoring and diagnosis of hydraulic turbines 

    Zhao, Weiqiang; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2022-01-22)
    Article
    Open Access
    To cope with the intermittent power supply of the new renewable energies and demand fluctuations, Francis turbines are required to operate more and more in an extended operating range, far away from the design point. With ...
  • Failure investigation of a solar tracker due to wind-induced torsional galloping 

    Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Presas Batlló, Alexandre (Elsevier, 2022-05-01)
    Article
    Open Access
    Solar power installations are increasing every year due to the decarbonization policy established around the world. Photovoltaic (PV) systems and specifically one-axis solar trackers are the most used type of installations ...
  • Prediction of cavitation erosion with different erosion risk indicators 

    Geng, Linlin; Zhang, Dingli; Chen, Jian; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (2022-02)
    Article
    Restricted access - publisher's policy
    This present work devoted to simulate the unsteady cavitating flow around a hydrofoil and assess its erosion power predicted by different erosion risk indicators. For that, the behavior of unsteady cloud cavity is numerically ...
  • On the quantification of local power densities in a new vibration bioreactor 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Roehr, Charline; Mele, Elisa; Bieh, Christoph; Heiss, Christian; Bosbach, Wolfram A. (Public Library of Science (PLOS), 2021-01-01)
    Article
    Open Access
    We investigate the power densities which are obtainable locally in a vibration bioreactor. These reactor systems are of great relevance for research about oncological or antibacterial therapies. Our focus lies on the local ...
  • Implant resonance and the mechanostat theory: Applications of therapeutic ultrasound for porous metallic scaffolds 

    Deering, Joseph; Presas Batlló, Alexandre; Yu, Bosco; Valentín Ruiz, David; Heiss, Christian; Bosbach, Wolfram A.; Grandfield, Kathryn (Elsevier, 2021-06-01)
    Article
    Restricted access - publisher's policy
    The development of treatment strategies for improving secondary stability at the bone-implant interface is a challenge. Porous implants are one solution for improving long-term implant stability, but the osteoconduction ...
  • On the use of neural networks for dynamic stress prediction in Francis turbines by means of stationary sensors 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Zhao, Weiqiang; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Elsevier, 2021-06-01)
    Article
    Restricted access - publisher's policy
    Nowadays, one of the major mechanical issues of hydraulic turbines and particularly Francis turbines are the failures produced by fatigue. Due to the massive entrance of new renewable energies such as wind or solar, hydraulic ...
  • 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
    Open Access
    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 ...
  • Improved damage detection in Pelton turbines using optimized condition indicators and data-driven techniques 

    Zhao, Weiqiang; Egusquiza Montagut, Mònica; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard (2021-01-07)
    Article
    Open Access
    The health condition of hydraulic turbines is one of the most critical factors for the operation safety and financial benefits of a hydro power plant. After the massive entrance of intermittent renewable energies, hydropower ...
  • Understanding the influence of wake cavitation on the dynamic response of hydraulic profiles under lock-in conditions 

    Roig Bauzà, Rafel; Chen, Jian; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (2021-09-22)
    Article
    Open Access
    To accelerate the integration of fluctuating renewable energy technologies in the power systems, it is necessary to increase the flexibility of hydropower by operating turbines at off-design conditions. Unfortunately, this ...
  • Increasing the operating range and energy production in Francis turbines by an early detection of the overload instability 

    Zhao, Weiqiang; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2021-08)
    Article
    Open Access
    With the increasing entrance of wind and solar power for the generation of electricity, more flexibility is demanded to hydropower plants. More flexibility means that hydro turbines have to increase the operating range ...
  • Dynamic behaviour of a Francis turbine during voltage regulation in the electrical power system 

    Vagnoni, Elena; Valentín Ruiz, David; Avellan, François (2021-02-01)
    Article
    Open Access
    Hydroelectric units can be operated in synchronous condenser mode to provide reactive power to the electrical power system (EPS) for voltage regulation. In this operating mode, the hydraulic turbine consumes active power ...
  • 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
    Restricted access - publisher's policy
    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. ...

View more