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Active control of a separated turbulent boundary layer in adverse pressure gradient

Abstract : Flow control allows to suppress boundary layers separation, which largely deteriorates the performances of machineries which interact with fluid (aircraft, cars, turbomachineries, etc.). This study concentrates more particularly on active flow control with continuous jets. A ramp model which allows to manipulate the boundary layer equilibrium was realized and set in Laboratoire de Mécanique de Lille wind tunnel. The first part of the work was to characterize the flow over the model with wool-tufts and oil-film visualisations, pressure distribution, hot-wire anemometry and PIV measurements. The aim was to define a ramp configuration for the flow control study and to know precisely the characteristics of the retained flow. The selected configuration corresponds to an adverse pressure gradient flow followed by a separation on the flap, which mimics the flow on the suction side of a wing. With friction probes coupled with wool-tufts visualisations, passive actuators and active continuous jets were studied and optimised. Finally, some of the optimum active configurations found were characterized in more details with PIV measurements over the entire separated region. It appears that continuous jets do not suppress the separation mechanisms, but only reduce their intensity and squeeze them more or less against the wall
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https://tel.archives-ouvertes.fr/tel-00752207
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Submitted on : Thursday, November 15, 2012 - 9:57:25 AM
Last modification on : Tuesday, November 24, 2020 - 2:18:05 PM
Long-term archiving on: : Saturday, February 16, 2013 - 3:42:25 AM

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  • HAL Id : tel-00752207, version 1

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Christophe Cuvier. Active control of a separated turbulent boundary layer in adverse pressure gradient. Other. Ecole Centrale de Lille, 2012. English. ⟨NNT : 2012ECLI0015⟩. ⟨tel-00752207⟩

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