Recent Submissions

  • Synchronous condenser operation in Francis turbines: Effects in the runner stress and machine vibration 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Elsevier, 2020-02-01)
    Article
    Restricted access - publisher's policy
    Reactive power shortage is one of the current issues that endanger the stability of the power grid systems. Some massive blackouts have been experienced in the past years due to the unbalance of reactive power. One of the ...
  • Numerical analysis of the influence of design parameters on the efficiency of an OWC axial impulse turbine for wave energy conversion 

    Luo, Yongyao; Presas Batlló, Alexandre; Wang, Zhengwei (2019-03-12)
    Article
    Open Access
    Oscillating water column (OWC) axial impulse turbines permit the conversion of wave energy into electrical power. Unlike other hydropower units with a mature and well established technology, such turbines have been recently ...
  • Experimental measurements of the natural frequencies and mode shapes of rotating disk-blades-disk assemblies from the stationary frame 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Multidisciplinary Digital Publishing Institute, 2019-09-14)
    Article
    Open Access
    Determining the natural frequencies and mode shapes of rotating turbomachinery components from both rotating and stationary reference frames is of paramount importance to avoid resonance problems that could affect 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 ...
  • 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 ...
  • 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 ...
  • Fatigue life estimation of Francis turbines based on experimental strain measurements: Review of the actual data and future trends 

    Presas Batlló, Alexandre; Luo, Yongyao; Guo, Bao; Wang, Zhengwei (2019-03)
    Article
    Restricted access - publisher's policy
    Due to the massive entrance of new renewable energies such as wind or solar, hydraulic turbines have to work far from its designed point and withstanding multiple transients, such as starts and stops, that shorten the ...
  • Influence of the hydrodynamic damping on the dynamic response of Francis turbine runners 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Jou Santacreu, Esteban; Egusquiza Estévez, Eduard (2019-10-01)
    Article
    Restricted access - publisher's policy
    The dynamic behavior of Francis runners is of interest in the hydraulic machinery field since it is one of the most used type of hydraulic turbines for electricity generation. To evaluate the dynamic behavior of Francis ...
  • Failure investigation of a Kaplan turbine blade 

    Zhang, Ming; Valentín Ruiz, 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 ...

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