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  • Numerical investigation into the influence on hydrofoil vibrations of water tunnel test section acoustic modes 

    Wang, Wei; Zhou, Lingjiu; Wang, Zhengwei; Escaler Puigoriol, Francesc Xavier; De La Torre, Oscar (2019-06-17)
    Article
    Restricted access - publisher's policy
    High-speed water tunnels are typically used to investigate the single-phase and two-phase flows around hydrofoils for hydraulic machinery applications but their dynamic behavior is not usually evaluated. The modal analysis ...

  • Added mass effects on a Francis turbine runner with attached blade cavitation 

    Huang, Xingxing; Escaler Puigoriol, Francesc Xavier (Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-11)
    Article
    Open Access
    To have a safe structural design, an analysis of the dynamic behavior of a Francis turbine runner with consideration of the added mass e ects of surrounding water is necessary during design phase. Both in design and at o ...

  • 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 ...

  • Numerical Investigation into the Effect of Sound Speed in Attached Cavitation on Hydrofoil Modes of Vibration 

    Escaler Puigoriol, Francesc Xavier; De la Torre Rodriguez, Oscar (2019-05-09)
    Article
    Open Access
    It has been found recently that the dynamic behavior of a cavitating hydrofoil is di erent from that in pure water in that, not only are the natural frequencies di erent, but the mode shapes may also change. In order to ...

  • 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 ...

  • Full-scale wind turbine vibration signature analysis 

    Escaler Puigoriol, Francesc Xavier; Mebarki, Toufik (2018-12-07)
    Article
    Open Access
    A sample of healthy wind turbines from the same wind farm with identical sizes and designs was investigated to determine the average vibrational signatures of the drive train components during normal operation. The units ...

  • 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 ...

  • Testing of self-similarity and helical symmetry in vortex generator flow simulations 

    Fernandez, Unai; Velte, Clara; Rethore, Pierre Elouan; Sorensen, Niels N.; Egusquiza Estévez, Eduard (2016-06)
    Article
    Open Access
    Vortex generators (VGs) are used increasingly by the wind turbine industry as flow control devices to improve rotor blade performance. According to experimental observations, the vortices generated by VGs have previously ...

  • Axisymmetric vibrations of a circular Chladni plate in air and fully submerged in water 

    Escaler Puigoriol, Francesc Xavier; De la Torre Rodriguez, Oscar (2018-10-10)
    Article
    Restricted access - publisher's policy
    In this study, experimental and numerical analyses were performed to determine the effects of water loading on the axisymmetric modes of vibration of a circular plate. The plate was harmonically excited at its centre through ...

  • 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. ...

  • 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
    Open Access
    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 ...

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