Airfoil Stall Suppression Using Feedback-Controlled Rectangular Bubble-Burst Control Plate

摘要

For the purpose of airfoil stall suppression, a rectangular cross-section burst control plate has been combined with the autonomous plate actuation system, which controls the height of the burst control plate for a NACA 0012 airfoil at a chord Reynolds number of 1.3 × 10~5. 1) It was confirmed that the surface pressure measured very close to the leading edge can be used as a good index for whether the airfoil has stalled or not. Hence, the plate height is controlled by using this information for stall suppression. Hysteresis was observed in these data, depending on the way to increase or decrease the plate height. 2) The feedback-control method for the present plate actuation system was constructed by modifying one from the previous system. Results demonstrated that the present combinations of the autonomous actuator system and the rectangular cross-section burst control plate can be an effective means of bubble-burst control and airfoil stall suppression. The increase in the lift coefficient was more than 11% when compared with the baseline airfoil and the stall-angle increment was about 3 deg.