Enviaments recents

  • Visualization research of energy dissipation in a pump turbine unit during turbine mode's starting up 

    Jin, Faye; Wang, Huanmao; Luo, Yongyao; Presas Batlló, Alexandre; Bi, Huili; Wang, Zhengwei; Lin, Kai; Lei, Xingchun; Yang, Xiaolong (Elsevier, 2023-11-01)
    Article
    Accés restringit per acord de confidencialitat
    Identifying the precise location of flow energy dissipation (FED) in pump turbines is crucial for enhancing the stability of pumped storage power stations. In this study, the transient process of the turbine mode's starting ...
  • Water saving options in hydropower by means of variable speed operation: a prototype study in a mid-head Francis turbine 

    Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Pinto, Pedro Diogo; Gonçalves de Carvalho, Ana; Coronati, Alex; Egusquiza Estévez, Eduard (Elsevier, 2023-06-22)
    Article
    Accés obert
    Nowadays, in order to mitigate the global warming effects, there is a need of renewable energy generation for the objective of carbon neutrality. In this context, hydropower plays a key role not only because the amount of ...
  • On the added modal coefficients of a rotating submerged cylinder induced by a whirling motion. Part 1: Experimental investigation 

    Roig Bauzà, Rafel; Sánchez Botello, Xavier; Jou Santacreu, Esteban; Escaler Puigoriol, Francesc Xavier (Multidisciplinary Digital Publishing Institute (MDPI), 2023-09-08)
    Article
    Accés obert
    The operation of submerged rotating machines, such as marine current or tidal turbines, can present deleterious fluid phenomena that may provoke extreme structural vibrations. To predict their dynamic responses, it is ...
  • Thermal, acoustic, and fire performance characterization of textile face mask waste for use as low-cost building insulation material 

    Neri, Manuela; Cuerva Contreras, Eva; Levi, Elisa; Pujadas Álvarez, Pablo; Müller, Edgardo; Guardo Zabaleta, Alfredo de Jesús (Elsevier, 2023-04)
    Article
    Accés obert
    Environmental issues are becoming increasingly important, and researchers are developing new technologies and models to reduce environmental impact. The circular economy is a production and consumption model that involves ...
  • Resonance vibration interventions in the femur: Experimental-numerical modelling approaches 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Deering, Joseph; Grandfield, Kathryn; Mele, Elisa; Heiss, Christian; Bosbach, Wolfram A.; Kampschulte, Marian; Yu, Bosco; Biehl, Christoph; Krombach, Gabriele A. (Elsevier, 2021-12)
    Article
    Accés restringit per política de l'editorial
    Motive: External vibration excitation might be key to many novel non-surgical interventions for pathologies in the musculoskeletal system and in other parts of the human organism. Lack of understanding about vibration ...
  • Thermal assessment of a ventilated double skin façade component with a set of air filtering photocatalytic slats in the cavity 

    Roig Mayoral, Oriol; Cuerva Contreras, Eva; Pardal March, Cristina; Guardo Zabaleta, Alfredo de Jesús; Isalgué Buxeda, Antonio; López Besora, Judit (2023-01-17)
    Article
    Accés obert
    Indoor air quality is a crucial factor when evaluating habitability, especially in developed countries, where people spend most of their time indoors. This paper presents a novel double skin façade (DSF) system that combines ...
  • Time-frequency domain characteristics analysis of a hydro-turbine governor system considering vortex rope excitation 

    Lei, Liuwei; Li, Feng; Xu, Beibei; Egusquiza Montagut, Mònica; Luo, Xingqi; Zhang, Junzhi; Egusquiza Estévez, Eduard; Chen, Diyi; Jiang, Wei; Patelli, Edoardo (2022-01)
    Article
    Accés obert
    Understanding and simulating the dynamic characteristics of the hydro-turbine governor system is essential to guarantee the safety of the hydro-power systems. This study proposes a modification method of the water head at ...
  • Numerical analysis on the modal characteristics of a pumped storage unit runner in cavitating flow 

    Cao, Jingwei; Luo, Yongyao; Presas Batlló, Alexandre; Mao, Zhongyu; Wang, Zhengwei (Elsevier, 2022-12-01)
    Article
    Accés restringit per política de l'editorial
    Cavitation is an important issue in pumped storage unit as it can compromise the safe and stable operation of the unit. The present work aims revealing the dynamic behavior of a pump-turbine runner in cavitating flow from ...
  • Experimental and numerical investigation on the influence of a large crack on the modal behaviour of a Kaplan turbine blade 

    Zhang, Ming; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Elsevier, 2020-01-01)
    Article
    Accés restringit per política de l'editorial
    A large crack was discovered on one blade of a Kaplan turbine prototype after the inspection of the machine. In order to know the origin of the crack, a failure analysis was previously carried out (Zhang et al., 2019). To ...
  • Determination of the natural frequencies of a prototype Kaplan turbine 

    Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre; Moraga González, Greco Alonso (Institute of Physics (IOP), 2022-09-01)
    Article
    Accés obert
    The natural frequencies of a turbine can be calculated from numerical methods. By comparing these natural frequencies with excitation sources, one can know the danger of a resonance and a possible failure in a component ...
  • Benefits of battery hybridization in hydraulic turbines. Wear and tear evaluation in a Kaplan prototype 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Drommi, Jean-Louis (2022-11)
    Article
    Accés obert
    Kaplan turbines are nowadays used to provide Frequency Containment Reserve (FCR) to the grid due to their fast capacity to regulate their power maintaining high efficiency. However, this continuous power regulation increases ...
  • Analysis of the mode shapes of Kaplan runners 

    Moraga González, Greco Alonso; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre (Multidisciplinary Digital Publishing Institute, 2022-07-02)
    Article
    Accés obert
    To prevent lifetime shortening and premature failure in turbine runners, it is of paramount importance to analyse and understand its dynamic response and determine the factors that affect it. In this paper, the dynamic ...

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