Exploració per tema "Cavitació"
Ara es mostren els items 1-20 de 56
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Added mass effects of attached cavitation on the blades of a Francis runner
(2016)
Text en actes de congrés
Accés obert -
Anàlisi, calibratge i posta en marxa d’un banc d’assaig de cavitació amb finalitats docents
(Universitat Politècnica de Catalunya, 2019-07-10)
Treball Final de Grau
Accés obertEl departament de Mecànica de Fluids disposa d’un banc d’assaig amb un venturi que es vol aprofitar per a l’estudi de pèrdues de càrrega i cavitació. En el treball, s’avaluen les condicions de funcionament del banc d’assaig ... -
Assessment of RANS turbulence models and Zwart cavitation model empirical coefficients for the simulation of unsteady cloud cavitation
(Engineering Applications of Computational Fluid Mechanics, 2019-11-26)
Article
Accés obertThe numerical simulation of unsteady cavitation flows is sensitive to the selected models and associated parameters. Consequently, three Reynolds Average Navier-Stokes (RANS) turbulence models and the Zwart cavitation model ... -
Assessment of remote cavitation detection methods with flow visualization in a full scale francis turbine
(2018)
Text en actes de congrés
Accés obertThis paper describes the experimental investigations carried out in the Francis turbine at Svorka power plant operated by Statkraft in Norway. The unit, with a head of 260 m, can deliver a maximum output load of 25 MW. The ... -
Assessment of turbulence models for the prediction of Bénard- Von Kármán vortex shedding behind a truncated hydrofoil in cavitation conditions
(Institute of Physics (IOP), 2021)
Text en actes de congrés
Accés obertThe transient cavitating flow in the wake of a hydrofoil at zero incidence angle has been simulated using a homogeneous mixture cavitation mass transfer model combined with both Reynolds Average Navier-Stokes (RANS) and ... -
Caracterización del tipo de cavitación mediante dinámica computacional de fluidos para posteriores aplicaciones al estudio experimental del daño por cavitación
(2011-11-01)
Article
Accés obertLa cavitación se corresponde a una estructura bifásica (líquido-vapor) cuando la presión del líquido disminuye hasta su presión de vapor, pv. Esta disminución de pv puede deberse a diversos factores relacionados con la ... -
Cavitation effects on the structural resonance of hydraulic turbines: Failure analysis in a real francis turbine runner
(2018-09-03)
Article
Accés obertWhen 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 ... -
Detection of erosive cavitation on hydraulic turbines through demodulation analysis
(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 ... -
Effect of cavitation in a Venturi closed-loop system
(Universitat Politècnica de Catalunya, 2020-02-14)
Treball de recerca tutelat
Accés restringit per decisió de l'autorThe cavitation of liquid water in a Venturi throat section is an interesting and complex phenomenon to study. This paper focuses on the analysis of a set of experiments highlighting this effect, and the main purpose is to ... -
Estudio de la cavitación en una turbina en modo bomba
(Universitat Politècnica de Catalunya, 2021-01-26)
Treball Final de Grau
Accés obertL'objectiu d'aquest treball és l'estudi de la cavitació en una turbina en mode bomba mitjançant mètodes numèrics. En els primers apartats es fa un resum de les equacions bàsiques de la dinàmica de fluids i una introducció ... -
Estudio teórico del Tunel de Cavitación y análisis del sistema de medición
(Universitat Politècnica de Catalunya / Universidad de Buenos Aires, 2014)
Treball Final de Grau
Accés obertEl fenómeno de la cavitación es uno de los principales motivos del deterioro de las hélices o turbomáquinas (bomba axial en fluido incompresible) y, por ello, resulta un factor fundamental a tener en cuenta en el diseño ... -
Estudio teórico del túnel de cavitación y análisis del sistema de medición
(Universitat Politècnica de Catalunya / Universidad de Buenos Aires, 2014)
Treball Final de Grau
Accés obertEl fenómeno de la cavitación es uno de los principales motivos del deterioro de las hélices o turbomáquinas (bomba axial en fluido incompresible) y, por ello, resulta un factor fundamental a tener en cuenta en el diseño ... -
Estudio y validación de modelos de cavitación en un código de mecánica de fluidos computacional
(Universitat Politècnica de Catalunya, 2012-06)
Projecte/Treball Final de Carrera
Accés obertThis Project deals with the study and validation of an implemented model of cavitation developed by Philip J.Zwart, Andrew G.Gerber and T.Belamri in CFD using ANSYS Fluent software. Several numerical simulations have ... -
Experimental investigation of a cavitating Venturi and its application to flow metering
(2021-04)
Article
Accés obertAn experimental investigation has been carried out to evaluate the performance of a cavitating Venturi flow. For that purpose, a closed loop circuit with a centrifugal pump and a transparent asymmetric converging-diverging ... -
Experimental investigation of added mass effects on a hydrofoil under cavitation conditions
(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 ... -
Experimental Investigation of the Cavitation Effects on the Heat Generation in a Closed Loop Pumping System
(2018)
Text en actes de congrés
Accés obertA series of tests were carried out in the cavitation tunnel of the Laboratory for Water and Turbine Machines of the University of Ljubljana in order to investigate the effects of cavitation in the water heating process of ... -
Experimental mode shape determination of a cantilevered hydrofoil under different flow conditions
(2016-12-01)
Article
Accés obertThe first three mode shapes of a cantilevered NACA0009 hydrofoil were experimentally investigated in air and under different flow conditions in a cavitation tunnel. First and second bending modes and first torsion mode ... -
Failure investigation of a Francis turbine under the cavitation conditions
(2016)
Text en actes de congrés
Accés obertAcoustic-Structural coupling methodology has been used to numerically investigate the failure of a Francis turbine runner that broke down within one day of operation. The goal of the work has been to determine the feasibility ... -
Implicit large eddy simulation of unsteady cloud cavitation around a plane-convex hydrofoil
(2015-12-01)
Article
Accés obertThe present paper focuses on the erosive cavitation behavior around a plane convex hydrofoil. The Zwart-Gerber-Belamri cavitation model is implemented in a library form to be used with the OpenFOAM. The implicit large eddy ... -
Improvement of cavitation mass transfer modeling by including Rayleigh–Plesset equation second order term
(2020-06-03)
Article
Accés restringit per política de l'editorialThe current study evaluates the effect of taking into account the second order term of the Rayleigh– Plesset equation for the numerical simulation of cavitation with homogeneous mixture models. For that, the corrected ...