Exploració per autor "Egusquiza Estévez, Eduard"
Ara es mostren els items 21-40 de 96
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Computational fluid dynamics modeling of impinging gas-jet systems: I. Assessment of eddy viscosity models
Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Escaler Puigoriol, Francesc Xavier (2005-07-15)
Article
Accés restringit per política de l'editorialComputational fluid dynamics plays an important role in engineering design. To gain insight into solving problems involving complex industrial flows, such as impinging gas-jet systems (IJS), an evaluation of several eddy ... -
Computational fluid dynamics modeling of impinging gas-jet systems: II. Application to an industrial cooling system device
Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Valero Ferrando, Ma. del Carmen (2005-07-15)
Article
Accés restringit per política de l'editorialA numerical analysis of the flow behavior in industrial cooling systems based on arrays of impinging jets has been performed, using several eddy viscosity models to determine their modeling capabilities. For the cooling ... -
Condition monitoring of a prototype turbine. Description of the system and main results
Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Bossio, Matias (Institute of Physics (IOP), 2017)
Text en actes de congrés
Accés obertThe fast change in new renewable energy is affecting directly the required operating range of hydropower plants. According to the present demand of electricity, it is necessary to generate different levels of power. Because ... -
Condition monitoring of pump-turbines
Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (2014)
Text en actes de congrés
Accés restringit per política de l'editorialAt present, new renewables like wind, solar and marine energy are having a strong development. The generation of energy by renewables has the disadvantage that it depends on atmospheric conditions. It means that they ... -
Condition monitoring of pump-turbines. New challenges
Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Presas Batlló, Alexandre; Rodriguez Godoy, Cristian (2015-05)
Article
Accés obertAt present, pumped storage is the only system to store huge amounts of energy. The surplus of energy in the electrical grid is used for pumping water from a lower to a higher reservoir (pump operation). At peak hours or ... -
Detailed study of the rotor-stator interaction phenomenon in a moving cascade of airfoils
Fontanals García, Alfred; Coussirat Núñez, Miguel Gustavo; Guardo Zabaleta, Alfredo de Jesús; Egusquiza Estévez, Eduard (2010)
Comunicació de congrés
Accés restringit per política de l'editorialIn turbomachinery the Rotor-Stator Interaction (RSI) is an important phenomenon that has a strong influence on the machine behavior. These interactions can have a significant impact on the vibrational and acoustical ... -
Detection and analysis of part load and full load instabilities in a real Francis turbine prototype
Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (Institute of Physics (IOP), 2017)
Text en actes de congrés
Accés obertFrancis turbines operate in many cases out of its best effici ency point, in order to regulate their output power according to the instantaneous ener gy demand of the grid. Therefore, it is of paramount importance to analyse ... -
Detection of erosive cavitation on hydraulic turbines through demodulation analysis
Presas Batlló, Alexandre; Luo, Yongyao; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Wang, Zhengwei; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2018)
Text en actes de congrés
Accés obertErosive cavitation in hydraulic turbines affects severely the runner structure, increasing maintenance costs and reducing the remaining useful life of the component. Actual vibro-acoustic techniques used to detect this ... -
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
Accés obertNowadays, 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 ... -
Diagnostics of a hydraulic turbine failure
Egusquiza Montagut, Mònica; Presas Batlló, Alexandre; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Xu, Beibei; Chen, Diyi; Egusquiza Estévez, Eduard (2022)
Text en actes de congrés
Accés obertThis paper presents the failure analysis and diagnostic of a hydraulic turbine. Shortly after a maintenance revision the thrust bearing of the turbine was destroyed when the turbine was put into operation. The damaged ... -
Dynamic analysis of Francis Runners-Experiment and numerical simulation
Lais, Stefan; Qwenguei, Liang; Henggeler, Urs; Weiss, Thomas; Escaler Puigoriol, Francesc Xavier; Egusquiza Estévez, Eduard (2009-10-01)
Article
Accés restringit per política de l'editorial -
Dynamic model for axial motion of horizontal pelton turbine and validation in actual failure case
Rodriguez Godoy, Cristian Gabriel; Egusquiza Estévez, Eduard; Egusquiza Montagut, Mònica; Reyes, S.; Zambrano, D.; Tapia Ladino, Juan Antonio (2020-01-01)
Article
Accés obertPelton turbines are important machines for power generation from a renewable energy source such as water. For power rates below 20 MW, the rotor of Pelton turbines is usually in horizontal position. Considering ideal ... -
Dynamic response of a rotating disk submerged and confined. Influence of the axial gap
Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2016-04-01)
Article
Accés obertIn this paper, the natural frequencies and mode shapes of a rotating disk submerged and totally confined inside a rigid casing, have been obtained. These have been calculated analytically, numerically and experimentally ... -
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
Accés obertWorldwide 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. ... -
Dynamic response of the MICA runner. Experiment and simulation
Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Bossio, Matias (Institute of Physics (IOP), 2017)
Text en actes de congrés
Accés obertStudying the dynamic response of Francis turbine runners is of paramount importance in order to avoid resonance problems during operating conditions. For this purpose, the natural frequencies as well as their associated ... -
El Diagnóstico de daños en grupos hidroeléctricos mediante el análisis de vibraciones
Egusquiza Estévez, Eduard; Nascimento, Luiz de Paula do; Valero Ferrando, Ma. del Carmen; Jou Santacreu, Esteban (1994)
Article
Accés obertEl análisis del comportamiento vibratorio de Grupos Hidroeléctricos se puede utilizar para el diagnóstico del estado de la máquina. Se pretende detectar daños incipientes y poder seguir la evolución del estado de la máquina ... -
Experimental analysis of the dynamic behavior of a rotating disk submerged in water
Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2014)
Text en actes de congrés
Accés obertTo study the dynamic behavior of turbine runners (natural frequencies and mode shapes) not only the added mass effect of still water has to be considered. Also the effect of rotation may not be neglected in the dynamic ... -
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
Accés obertn 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 ... -
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 obertA 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 ... -
Experimental investigation of added mass effects on a hydrofoil under cavitation conditions
Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier; Egusquiza Estévez, Eduard; Farhat, Mohamed (2013-03-13)
Article
Accés restringit per política de l'editorialThe influence of leading edge sheet cavitation and supercavitation on the added mass effects experienced by a 2-D NACA0009 truncated hydrofoil has been experimentally investigated in a hydrodynamic tunnel. A non-intrusive ...