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Calcul de pression et d'efforts sur un profil en mouvement : application aux systèmes de récupération d'énergie

Abstract : The determination of the pressure field in a flow and/or forces on a moving profile from measurements of velocities carried out in the fluid is a current problem that is of interest to many domains of research in fluid mechanics like the energy recovery systems (wind, hydro) or the speed control of hydraulic turbines, etc…In this PhD thesis, we make a contribution to this problem by initially proposing an original method which allows us to approach unsteady velocity fields in the whole of the flow obtained by PIV optical measurements (including the profile) using Legendre's orthogonal polynomial theory. The Navier-Stokes equations then make it possible to obtain polynomial pressure gradients in the whole of the fluid and thus to be able to calculate the pressure field in the flow by using the momentum balance equation in a judiciously chosen reference range, to determine the forces on an oscillating mobile profile. This method is then validated on a fixed profile using numerically simulated data and experimental data.In a second step, from series of flow PIV measurements on a NACA0015 profile subjected to different types of oscillations, we apply the method described above to reconstruct the unsteady pressure fields and to evaluate the instantaneous and average forces on the profile. The study of a certain number of ranges of frequencies and amplitudes makes it possible to compare our results, in order to seek a better efficiency.
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Submitted on : Monday, August 20, 2018 - 3:14:07 PM
Last modification on : Tuesday, June 4, 2019 - 6:21:15 PM
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  • HAL Id : tel-01858361, version 1



van Tuê Nguyên. Calcul de pression et d'efforts sur un profil en mouvement : application aux systèmes de récupération d'énergie. Mécanique des fluides [physics.class-ph]. Université de Poitiers, 2017. Français. ⟨NNT : 2017POIT2263⟩. ⟨tel-01858361⟩



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