Closed-loop control of a turbulent mixing layer - experimental study

Open and closed-loop control of a turbulent mixing layer is experimentally performed in a dedicated wind-tunnel facility (TUCOROM). The flow is manipulated with 100 independently operating fluidic micro-valve actuators integrated transversely in the trailing edge of the splitter plate. Sensing is performed with a rake of 30 hot-wire probes located downstream in the mixing layer. The control goal is a manipulation of the spreading rate. The underlying physical mechanisms employ a wide range of frequencies as well as a wide range of spanwise modes. The calculated Reynolds number based on vorticity thickness is about $Re=2000$. Control authority is presented with PIV and hot-wire results.