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Master Thesis

Contrôle actif d'écoulements décollés par jets pulsés : étude numérique et expérimentale de l'écoulement autour d'une rampe descendante

Abstract : This dissertation is a contibution to the FOSCO (FOrcing Separation COntrol) project. This project aim at the comprehension of the tridimensionnal separation mechanisms and its control by pulsed jets for the case of a 25° slanted ramp. This geometry has been chosen to model the separated flow topology featured in manifold application cases of automotive and aeronautical indutries. The manuscript showcases the results of experimental investigations conducted so as to characterize the flow topology and to validate a numerical simulation code which the main features (Immersed Boundary, DES, solver) are described. The parallelisation of the code is also investigated. The implementation of a vortex identification method from maps of PIV measurement along with the wake flow frequency analysis lead to highlight the aerodynamical loop mechanism of the separation and the role played by the Kelvin-Helmholtz instabilities. This characterization is added complementally to the analysis of the static pressure field on the slanted face to define a control strategy tailored for a given airflow speed. A method to evaluate the drag force based on the integral form of the momentum equation is introduced and then applied in order to quantify the effects of the various control strategy from an energy efficiency perspective.
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https://dumas.ccsd.cnrs.fr/dumas-01677540
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Submitted on : Monday, January 8, 2018 - 2:27:00 PM
Last modification on : Saturday, February 8, 2020 - 12:10:04 PM
Long-term archiving on: : Saturday, May 5, 2018 - 4:53:17 AM

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  • HAL Id : dumas-01677540, version 1

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Alexandre Debisschop. Contrôle actif d'écoulements décollés par jets pulsés : étude numérique et expérimentale de l'écoulement autour d'une rampe descendante. Mécanique des fluides [physics.class-ph]. 2014. ⟨dumas-01677540⟩

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