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Theses

Contrôle des décollements en boucle fermée

Abstract : European policy advises manufacturers to design aircrafts allowing to reduce by 50% the perceived noise, by 50% the consumption and by 80% the NOx emissions before 2020. Engineers are led to consider innovative solutions based on flow control, particularly for flow separation which generally has deleterious effects on aerodynamic performance. The work presented in this thesis is dedicated to closed loop flow separation control from a rounded ramp by a synthetic jet with adjustable frequency and amplitude. The thesis focuses on two main axes. The first axis has allowed to study the flow response from a periodic disturbance by numerical simulations of LES type with the aim of pursuing the physics knowledge involved in the control and define the control objectives. The optimal frequencies and amplitudes under different criteria were identified and analyzed. The second axis was dedicated to the closed loop control of the system quasi-static response by the application of PID, optimized extremum-seeking and fuzzy logic regulators. Their design required the identification of a non-linear black-box model NARX. Non-linear algorithms, in particular fuzzy logic, were particularly effective. The approach was validated through a real-time extremum-seeking control application on a unsteady RANS simulation.
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https://tel.archives-ouvertes.fr/tel-00659979
Contributor : Pierre-Yves Pamart <>
Submitted on : Monday, January 16, 2012 - 9:20:59 PM
Last modification on : Monday, December 14, 2020 - 9:52:48 AM
Long-term archiving on: : Tuesday, April 17, 2012 - 2:20:41 AM

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  • HAL Id : tel-00659979, version 1

Citation

Pierre-Yves Pamart. Contrôle des décollements en boucle fermée. Mécanique des fluides [physics.class-ph]. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨tel-00659979⟩

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