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<dc:title xml:lang="fr">Conception et optimisation d'un système hydrolien à aile oscillante passive</dc:title>
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<dc:subject xml:lang="fr">Aile oscillante passive</dc:subject>
<dc:subject xml:lang="fr">Système hydrolien</dc:subject>
<dc:subject xml:lang="fr">Interaction fluide-structure</dc:subject>
<dc:subject xml:lang="fr">Modélisation numérique</dc:subject>
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<dc:subject xml:lang="fr">Optimisation</dc:subject>
<dc:subject xml:lang="en">Fully passive flapping foil</dc:subject>
<dc:subject xml:lang="en">Hydrokinetic turbine</dc:subject>
<dc:subject xml:lang="en">Fluid-structure interaction</dc:subject>
<dc:subject xml:lang="en">Numerical modeling</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans un scénario de transition énergétique où la production et les grands réseaux de distribution d’électricité sont remis en cause, le potentiel de production au niveau des écoulements à faible vitesse est important et reste encore peu exploité. Cette thèse étudie un concept novateur d’hydrolienne permettant de répondre en partie à cette problématique : le système hydrolien à aile oscillante passive. Bioinspiré de la nage d’animaux aquatiques, ce dispositif de récupération de l’énergie cinétique des courants consiste en une aile décrivant des mouvements périodiques de pilonnement et de tangage, entièrement induits par les interactions fluide-structure. Une première partie du travail a porté sur la construction d’un modèle numérique permettant de reproduire fidèlement le comportement du système. Un prototype d’aile oscillante passive à échelle réduite a ensuite été conçu et testé dans un canal hydraulique. Grâce à une technique de réglage dynamique des paramètres structuraux, le système a pu être étudié expérimentalement sur une large gamme de paramètres mécaniques et hydrauliques. L’étude des performances énergétiques du prototype a permis d’identifier des conditions de fonctionnement optimales. Dans ces conditions, des rendements hydrauliques supérieurs à 30% ont été obtenus. Les résultats de ce travail de thèse permettent d’envisager maintenant l’installation d’un système hydrolien à aile oscillante passive en milieu naturel. En effet, les configurations optimales identifiées à l’échelle réduite peuvent s’étendre naturellement à des conditions hydrauliques réelles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Given the current energy transition conjuncture, where the electricity production and the electricity grid are challenged, the hydraulic potential of low current sites is relevant and remains under-exploited. In such context, this thesis studies a novel concept of an energy harvester device: the fully passive flapping foil turbine. Bioinspired from aquatic animals swimming technique, this hydrokinetic energy harvester consists of an oscillating foil describing periodic heaving and pitching motions, entirely induced by fluid-structure interactions. The first part of this thesis deals with the development of a numerical model for accurately simulating the harvester behavior. Then, a reduced scale prototype of the fully passive flapping foil has been designed and tested in a water channel. Thanks to an original dynamic tuning strategy of the structural parameters, experiments have been conducted for a wide range of configurations of the harvester. The investigation of the harvesting performances of the prototype helped identifying several optimized parameters sets. In such cases, hydraulic efficiencies as high as 30% have been reached. The main results of this thesis allow to consider a full scale fully passive flapping foil harvester in realistic conditions. As a matter of fact, the optimized cases identified for the reduced scale prototype can be naturally extended to real operating conditions.</dcterms:abstract>
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