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A closed-loop, stall sense and control system was demonstrated on a morphing airfoil. The FlexSys, Inc. Mission Adaptive Compliant Wing (MACW) was modified to accept a Boeing Co. dielectric barrier discharge (DBD) actuator panel in a location immediately upstream of the trailing-edge morphing flap, and hot-film sensors were installed on the model surface. A signal analysis algorithm, developed by Tao Systems, Inc, was applied to the hot-film signals to detect separation and trigger activation of the DBD actuators. The system was successfully demonstrated in the AFRL SARL wind tunnel facility, and an improvement in lift of about 10% was observed at Mach 0.05 (chord Reynolds number 9 × 10 5 ) under closed-loop control and a turbulent boundary layer state. Actuator effectiveness was demonstrated up to Mach 0.1, but must be extended to Mach 0.2-0.3 to enable a practical stall control system for takeoff and approach of large aircraft. * Cleared for public release, distribution unlimited (88ABW-2009-4976).

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