Énergie marine renouvelable : caractérisation des ressources hydrocinétiques en Manche et étude d'impact de la turbulence sur l'efficacité de systèmes de récupération d'énergie tidale

Abstract : Despite the growing interest , the use of tidal energy still lags far behind other renewable resource. This delayed development can be explained, on the one hand, by the absence of a relevant methodology for quantifying the hydrokinetic potential and, on the other hand, by the hostile marine environment, in which turbulent phenomena apply constraints on the structure of marine current turbines. The use of High Frequency Radar, presented in the first part of this thesis, provides a powerful tool for analyzing tidal dynamics and its spatial and temporal heterogeneity. Never used in the fields of renewable marine energy, it offers a convincing alternative to numerical modeling which is often chosen although generating questionable results because of simplistic conceptualization of real phenomena. The second part of this thesis is the study of the impact of a fully developed turbulent flow on the performance of a Darrieus-type turbine prototypes. The spectral analysis of the current velocity time series revealed the scalar properties of the flow. Multiscale characterization showed that the flow is driven by a dynamic process of successive breaks of fluid structures of size ranging from the injection scale to the molecular diffusion scale. Finally, the dynamical scaling of the turbulence of the velocity and power spectra generated by the marine current turbine has revealed a certain similarity between the size of the eddies structures that govern the flow and the dimensions of the turbine.
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Maxime Thiébaut. Énergie marine renouvelable : caractérisation des ressources hydrocinétiques en Manche et étude d'impact de la turbulence sur l'efficacité de systèmes de récupération d'énergie tidale. Hydrologie. Université du Littoral Côte d'Opale, 2017. Français. ⟨NNT : 2017DUNK0457⟩. ⟨tel-01713201⟩

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