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Theses

Contrôle actif par pression interne des performances hydrodynamiques et de l'apparition de la cavitation d'un hydrofoil composite déformable en composite

Abstract : The control of deformable structures in naval applications, such as propellers and rudders, open the prospects for development and technological breakthrough. This thesis deals with the control of the hydrodynamic performance of a morphing hydrofoil in order to expand its operating domain and to delay the cavitation inception. A parametric study is carried out in order to evaluate the effect of the maximum thickness position and of the leading and trailing edge flaps on the hydrodynamic performances of a NACA 0012. The numerical analysis is carried out using the potential-boundary layer code Xfoil and shows that flaps have a significant effect on the operating domain of the hydrofoil as well as on the extent of its non-cavitation domain. Tests are carried out in the hydrodynamic tunnel of IRENav on non-deformable hydrofoils with imposed leading and trailing edge flaps. The measurements of lift and cavitation bucket show that numerical results fit well with experimental observations. Following these results, a morphing composite hydrofoil prototype driven by compliant composite structure and an internal pressure is manufactured and tested under various flow and internal pressure conditions. It is shown that pressure driven compliant composite structure is suitable to some extent to control hydrodynamic forces, allowing the operational domain of the compliant hydrofoil to be extended according to the angle of attack and the internal pressure. Pressure control also makes it possible to modify the sub-cavitation domain of the compliant hydrofoil. In parallel with the experiments, a numerical tool for the study of the Fluid Structure Interaction (FSI) of this type of composite structure is developed in order to help the design of hydrofoils. The results of the FSI simulations correspond well with the experimental results.
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Submitted on : Tuesday, November 30, 2021 - 5:25:23 PM
Last modification on : Wednesday, December 1, 2021 - 3:47:48 AM

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  • HAL Id : tel-03457841, version 1

Citation

Fatiha Mohammed Arab. Contrôle actif par pression interne des performances hydrodynamiques et de l'apparition de la cavitation d'un hydrofoil composite déformable en composite. Génie mécanique [physics.class-ph]. Université de Bretagne occidentale - Brest, 2020. Français. ⟨NNT : 2020BRES0068⟩. ⟨tel-03457841⟩

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