Characterisation of the Transient Dynamics of a Controlled Separated Flow Using Phase Averaged PIV
The transient dynamics of a high Reynolds number two-dimensional boundary layer flow undergoing a massive separation is investigated. A spanwise array of pulsed round jets, located upstream of the separated region, is used as actuators. Spatial and temporal organisation of the separation and reattachment processes are investigated using phase-averaged PIV measurements in combination with the survey of wall friction along the separation region with the overall objective to develop closed-loop controllers. While different sets of parameters including freestream flow to jet velocities ratio, duty cycle and jets frequency have been considered in the overall work, preliminary results for two cases are presented within.
KeywordsSeparation Bubble Transient Dynamic Recirculation Bubble Pulse Actuation Incline Flat Plate
The present work is supported by the Agence National de la Recherche (ANR) through the French ANR project SEPACODE and by the CISIT International Campus through the Contraéro project. The authors are indepted to C. Cuvier for his help during the experiments and for the PIV images processing, and J.M. Foucaut for his helpfull assistance.
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