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Low-Reynolds number flyers with a chord Reynolds number of 10 or below are sensitive to flow unsteadiness and require an effective flow control scheme to achieve stable flight performance. In this paper, unsteady aerodynamics under fluctuating free-stream conditions on an infinite wing with the SD7003 airfoil geometry at chord Reynolds number 1000 is controlled using a dielectric barrier discharge (DBD) actuator with the retrospective cost adaptive control algorithm. The control law, which requires knowledge of the first nonzero Markov parameter and nonminimum-phase zeros of the linearized flow-actuator model, adjusts control gains by minimizing a quadratic function of the retrospective performance. This paper extends previous research by addressing the lift stabilization mechanism under higher-magnitude disturbance conditions and assessing the variation of system-parameter estimates as functions of the impulse magnitude, free-stream velocity and nominal voltage. The sensitivity of the closed-loop performance to the accuracy of the parameter estimates is investigated by comparing the closed-loop performance with and without modeled parameter variations.

Retrospective Cost Adaptive Flow Control Using a Dielectric Barrier Discharge Actuator with Parameter-Dependent Modeling