Abstract
A feedback control is attempted against an unsteady flow separation artificially generated on the plate surface by periodically moving the curved ceiling up and down at a constant frequency. The controlling system consists of a turbulence ejecting apparatus on the upstream side and several tufts on the downstream side. The movement of the tufts is monitored by a movie camera. When a separation is detected by processing the images of the tufts, a jet of turbulent fluid is ejected into the boundary layer through a slot in the plate. It is shown that the separation region shifts downstream and becomes smaller by the control.
