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Contrôle d'écoulement interne au moyen d'actionneur ElectroHydroDynamique

Abstract : This work presents results of research on flow control in a dielectric liquid. The aim is to demonstrate our ability to control flow by means of ElectroHydroDynamic actuation. The first part of this PhD thesis is dedicated to a general overview of flow control and the methods available for measuring fluid velocity. The PIV method is selected to charaterize the flow of a charged plume. However, the presence of a high electric field in the dielectric liquid might bring into question the validity of using PIV, which is based on the fact that tracers accurately follow fluid movement. Theoretical and experimental studies were performed to find the proper conditions for using an ideal tracer that guarantees the accuracy of velocity measurements. This part enables us to choose the best seeding particle in silicone oil. The second part of this work is devoted to the study of flow control on a NACA0015 wing profile at ultra-low Reynolds numbers (Re < 5000). A bibliographic study presents strategies of flow control around wing profiles and in addition deals with different EHD actuators for dielectric liquids. Mean velocity fields and unsteady velocity fields of baseline flow are characterized and compared to controlled flow. The calculation of force based on the conservation of momentum (Navier-Stokes equations) enables us to estimate the hydrodynamic stresses applied by the fluid to the immersed profile. Lift and drag polarities are obtained to quantify the efficiency of the EHD actuator. Finally, the mechanisms of control are clarified and highlight the potential and limits of the EHD actuator for flow control applications.
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https://tel.archives-ouvertes.fr/tel-01981529
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Submitted on : Tuesday, January 15, 2019 - 10:24:23 AM
Last modification on : Tuesday, June 4, 2019 - 6:22:02 PM
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  • HAL Id : tel-01981529, version 1

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Clément Gouriou. Contrôle d'écoulement interne au moyen d'actionneur ElectroHydroDynamique. Mécanique des fluides [physics.class-ph]. Université de Poitiers, 2017. Français. ⟨NNT : 2017POIT2308⟩. ⟨tel-01981529⟩

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