抄録
This investigation focuses on closed-loop control of a reverse-flow region downstream of a fence. The fence is aligned perpendicular to the main flow. The fluctuating pressure difference, taken upstream and downstream at the base of the fence, is fed-back via a controller into an actuator, which generates suction and blowing with zero mean mass flux near the tip of the fence. When the controller is designed to amplify the fluctuating pressure difference, the reattachment length of the reverse-flow region is reduced more efficiently than by open-loop control. When the controller is designed to damp the fluctuating pressure difference, an increase of the reattachment length was expected to occur. Even though an increase was not observed, the reduction of the reattachment length obtained by closed-loop control was smaller than in the case of open-loop control.
