FLUIDS - Enginyeria de Fluids: Enviaments recents

Ara es mostren els items 1-12 de 162

    • Modelling and adaptive parameter estimation for a piezoelectric cantilever beam 

      Wang, Bin; Costa Castelló, Ramon; Na, Jing; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (2022)
      Article
      Accés obert
      This paper proposes a new adaptive estimation approach to online estimate the model parameters of a piezoelectric cantilever beam. The beam behavior is firstly modeled using partial differential equations (PDE) considering ...

    • Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study 

      Lu, Yonggang; Zhao, Weiqiang; Presas Batlló, Alexandre; Zhu, Rongsheng; Wang, Zhengwei (SAGE publishing, 2022-05-25)
      Article
      Accés restringit per política de l'editorial
      Lead-cooled fast reactor (LFR) is an important reactor type of the Generation IV nuclear energy, and the main coolant pump (MCP) is the only and most critical power equipment in primary circuit of LFR. The shutdown idling ...

    • Dynamic response analysis of a reduced scale Kaplan turbine model operating in propeller mode 

      Escaler Puigoriol, Francesc Xavier; Sánchez Botello, Xavier; Roig Bauzà, Rafel; Torre Rodríguez, Óscar de la; Mulu, Berhanu; Högström, Carl-Maikel (IOP Publishing, 2022)
      Text en actes de congrés
      Accés obert
      In the frame of the AFC4Hydro H2020 research project, an extensive measurement campaign has been carried out on a reduced scale Kaplan turbine model at the Vattenfall Research and Development facility in Älvkarleby, Sweden. ...

    • PZT actuators as on-board instruments to reduce vibrations and strains in submerged structures 

      Sánchez Botello, Xavier; Torre Rodríguez, Óscar de la; Roig Bauzà, Rafel; Costa Castelló, Ramon; Escaler Puigoriol, Francesc Xavier (IOP Publishing, 2022)
      Text en actes de congrés
      Accés obert
      This paper presents the design and evaluation of an active control system to reduce vibrations and strains of submerged structures. For that, a metallic disk mounted in a test rig has been equipped with on-board waterproof ...

    • 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 obert
      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 ...

    • 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 ...

    • 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
      Accés obert
      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 ...

    • Experimental investigation on the dynamic response of Pelton runners 

      Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2019)
      Text en actes de congrés
      Accés obert
      An effective condition monitoring is essential to increase the availability of Pelton turbines and to avoid unexpected damage. The main challenge consists in determining the deformations and the stresses in the runner while ...

    • On the exctitation of a submerged disk-like structure with RSI patterns 

      Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2015)
      Text en actes de congrés
      Accés restringit per acord de confidencialitat
      Determining the dynamic response of submerged and confined disk-like structures is of interest in the hydraulic turbines field. Disks present similar dynamic characteristics than hydraulic turbine runners, especially in ...

    • Transient Analysis of Pelton Turbine Prototypes 

      Egusquiza Montagut, Mònica; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard (2021)
      Text en actes de congrés
      Accés obert
      One of the most critical operating conditions in hydraulic turbines is the start-up transient. This may be characterized by the presence of several resonances, which increase the vibration and stress levels on the runners. ...

    • 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
      Accés obert
      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
      Accés obert
      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 ...