Application du contrôle actif aux instabilités aérodynamiques

Abstract
This paper describes experimental investigations in which adaptive methods are applied to various structures of active control of flow instabilities : flow excited cavity oscillations, compressor surge, and bursting phenomena in laminar boundary layer. The main results are as follows : the adaptive controller manages to automatically find its optimal characteristics in order to cancel the instability in the three experiments under consideration. In the boundary layer case, despite the non linear behaviour of the bursting process, a periodic train of artificially generated burst is significantly reduced downstream the cancelling source.