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Registros recuperados: 9
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Étude expérimentale de la turbulence dans les zones à forts courants et de son impact sur les hydroliennes ArchiMer
Ikhennicheu, Maria.
French waters have a strong potential for tidal turbines applications. In these areas of strong currents, intense velocity fluctuations are observed in the water column. They ultimately come from variations in seabed bathymetry and can have a strong impact on tidal turbine energy production and fatigue. In order to understand the turbulent structures generation in the wake of obstacles and to build a data base for future numerical studies, the Alderney Race conditions are reproduced experimentally, in a wave and current tank, in Froude similitude and with a Reynolds number as high as possible. In this study, real bathymetric variations are represented using canonical elements : a cube, a cylinder, an inclined plane or a combination of all three. Cases with...
Tipo: Text Palavras-chave: Turbulence; Essais expérimentaux; Hydroliennes; Obstacles; Sillage; PIV; LDV; POD; Turbulence; Experimental trials; Tidal turbines; Obstacles; Wake; PIV; LDV; POD.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00590/70177/68193.pdf
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Étude numérique et expérimentale du comportement d’hydroliennes ArchiMer
Mycek, Paul.
This manuscript deals with the numerical and experimental characterisation of the behaviour of marine current turbines. In the experimental part, trials were run at IFREMER’s wave and current flume tank in Boulogne-Sur-Mer, on prototypes of three-bladed horizontal axis turbines. Configurations with one single turbine on the one hand, and two turbines aligned with the incoming flow on the other hand, were considered for a large range of TSRs and, when relevant, of inter-device distances. The behaviour of the turbines is analysed in terms of performances (power and thrust coefficients) and development of the wake. The effects of the ambient turbulence intensity rate are also considered. Besides, numerical computations, obtained from a tridimensional unsteady...
Tipo: Text Palavras-chave: Hydroliennes; Interactions; Essais expérimentaux; Simulation numérique; Méthode particulaire; Méthode Vortex.; Marine current turbines; Interactions; Experimental trials; Numerical computation; Particle method; Vortex method.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00170/28152/26382.pdf
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Étude numérique du comportement d'hydroliennes à axe horizontal : vers une modélisation d'un parc d'hydroliennes ArchiMer
Mycek, Paul; Gaurier, Benoit; Germain, Gregory; Pinon, Gregory; Rivoalen, Elie.
L’implantation et le développement de fermes d’hydroliennes sont soumis à la compréhension des effets d’interaction entre machines. Des essais expérimentaux ont été réalisés dans le canal à houle et courant de l’IFREMER à Boulogne-sur-Mer, sur des maquettes d’hydrolienne 3 pales à axe horizontal, dans le but de caractériser les interactions entre deux hydroliennes alignées avec le courant. En parallèle un code numérique tridimensionnel est développé pour modéliser l'écoulement derrière une hydrolienne. Ce code de calcul est basé sur la méthode Vortex. Il permet entre autres de calculer les efforts et moments sur le rotor ainsi que de tracer des cartes de vitesses en aval de l'hydrolienne. La plupart des études numériques portant sur les interactions entre...
Tipo: Text Palavras-chave: Énergies marines; Simulation numérique; Méthode vortex; Méthode lagrangienne; Essais expérimentaux; Hydroliennes.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00141/25197/23307.pdf
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Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante ArchiMer
Trasch, Martin.
The thesis presented in this document deals with the caracterisation of the behaviour of an undulating membrane tidal energy converter. This kind of device uses the flutter instabilities occurring between a semi-rigid pre-strained membrane and a fluid flow in order to convert the sea currents energy. Above a certain critical flow speed, the structure ondulates, thus activating the linear converters fixed on it. In order to study this system, an experimental model is developped and tested in a flume tank. The power conversion system is simulated by hydraulic dampers. The membrane’s dynamics is analysed in many configurations through trajectory and force measurements, and leads to a parametric study. More realistic flow conditions are also studied, such as...
Tipo: Text Palavras-chave: Énergies marines renouvelables; Hydrolienne; Interaction fluidestructure; Instabilité de flottement; Essais expérimentaux; Particle Image Velocimetry; Modélisation numérique; Méthode vortex; Éléments finis; Corotationnel; Houle; Effet d’échelle; Marine renewable energy; Tidal energy converter; Power takeoff; Fluid-structure interaction; Flutter instability; Experimental trial; Particle Image Velocimetry; Numerical model; Vortex method; Corotational finite elements; Surface wave; Scale effect.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60185/63527.pdf
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Caractérisation numérique et expérimentale des perturbations engendrées par la présence de tables ostréicoles ArchiMer
Kervella, Youen; Germain, Gregory; Gaurier, Benoit; Cayocca, Florence; Lesueur, Patrick.
Sur de nombreux sites ostréicoles, d’importants mouvements sédimentaires modifient les conditions d’exploitation. Les mouvements naturels sont modifiés par la présence des tables à huîtres, les phénomènes en jeu étant de deux ordres : la perturbation des courants de marée et la modification des conditions de houle. Nous présentons dans ce document la méthodologie mise en place pour améliorer la compréhension des perturbations physiques du milieu engendrées par l’implantation de tables ostréicoles et caractériser les modifications de l’écoulement. Les résultats obtenus, tant expérimentaux que numériques, sont présentés et les développements pour une extension du modèle à l’échelle d’un parc ostréicole sont discutés. Des essais expérimentaux réalisés à...
Tipo: Text Palavras-chave: Mesures LDV; Essais expérimentaux; Simulations numériques; Contraintes de cisaillement; Hydrodynamique côtière; Table ostréicole.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12263/9044.pdf
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Simulation du comportement d’hydroliennes : modélisation de l’influence de la turbulence ambiante et des effets d’interaction ArchiMer
Carlier, Clement.
The development of marine current turbines arrays has been an active research topic for some years. However, many studies are still necessary in order to fully understand the behaviour of such arrays. One of these studies is the impact of the ambient turbulence on the behaviour of marine current turbines. Indeed recent studies have shown that ambient turbulence intensity highly modifies the behaviour of horizontal axis marine current turbines. Consequently numerical simulations have to represent the ambient turbulence or at least its effects on the performance and wake of the turbines. An other one of these studies is the assessment of interaction effect between turbines in close proximity. In order to highlight these interaction effects, experiments were...
Tipo: Text Palavras-chave: Simulation numérique; Hydrolienne; Turbulence ambiante; Synthetic-Eddy-Method; Hydroliennes en interaction; Essais expérimentaux; Sillage; Performance.; Numerical computations; Marine current turbine; Ambiant turbulence; Synthetic-Eddy- Method; Interacting turbines; Experimental trials; Wake; Performence.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00478/58926/61496.pdf
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Étude expérimentale des performances d’une hydrolienne, soumise aux effets de la turbulence et de l’interaction houle-courant ArchiMer
Gaurier, Benoit.
In the context of global warming, the extraction of energy by tidal turbines from marine currents must be integrated into the future energetic mix. Being confronted with a difficult marine environment, it is required to know the turbines’ behaviour when they are submitted to realistic solicitations to guarantee an optimal use. In this work, the marine turbine performance is studied when the machine is submitted to a turbulent current or a combined wave-current effect. The physical representation of trials at reduced scale is first described focusing on the incoming flow characterisation and its effects on a turbine model at 1:20 scale. The location and measurement type of the upstream velocity are discussed to accurately define its performance and its...
Tipo: Text Palavras-chave: Hydrolienne; Énergie marine renouvelable; Essais expérimentaux; PIV; LDV; Turbulence; Interaction houle-courant; Horizontal axis tidal turbine; Renewable energy; Experimental trials; PIV; LDV; Turbulence; Wave-current interaction.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00660/77197/78624.pdf
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Caractérisation numérique et expérimentale des effets d'interaction entre une hydrolienne et le milieu marin ArchiMer
Maganga, Fabrice.
This work aims to characterise by the means of expérimental and numerical modeling, the behavior of marine current turbine and the characteristics of the wake generated under realistic inflow conditions. For that purpose, we used a tri-bladed horizontal axis turbine of 0.7 m of diameter. Particular attention is paid to the flow characteristic effects on the efficiency of the turbine, but also on the generated wake. Tests are carried out in the Ifremer wave and current flume tank in Boulogne-sur-Mer and in the towing tank of Brest, taking into account current profils, upstream turbulence intensity level and disturbances generated by wave/current interaction. The development of a three-dimensional software based on vortex methods, taking into account the non...
Tipo: Text Palavras-chave: Hydrodynamique; Essais expérimentaux; Méthodes Vortex; Hydrolienne; Sillage.; Hydrodynamic; Experimental trials; Vortex Methods; Marine Current Turbine; Wake..
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00170/28153/26384.pdf
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Etude expérimentale et numérique du comportement d’hydroliennes à axe horizontal ArchiMer
Carlier, Clement; Mycek, Paul; Gaurier, Benoit; Germain, Gregory; Pinon, Gregory; Rivoalen, Elie.
Le développement de fermes d'hydroliennes a suscité et suscite toujours de nombreuses études parmi lesquelles figure l’étude des effets d'interactions entre les machines. Afin de comprendre ces effets d'interactions des essais expérimentaux ont été effectués dans un bassin à houle et courant sur des maquettes d’hydroliennes 3 pales à axe horizontal, régulées en vitesse de rotation. Ces essais portent sur la caractérisation du fonctionnement d’une, puis de deux hydroliennes alignées avec le courant à partir de mesure de performance et de sillage. En parallèle, un code numérique tridimensionnel est développé pour modéliser une ou plusieurs hydroliennes dans un écoulement. On présente ici les résultats numériques et expérimentaux, obtenus pour deux points de...
Tipo: Text Palavras-chave: Energies marine; Hydroliennes; Simulation numérique; Méthode vortex; Méthode lagrangienne; Essais expérimentaux.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00212/32341/30781.pdf
Registros recuperados: 9
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