Abstract
Synthetic jet actuators (SJAs) may be carefully designed to alleviate the negative impact of impinging flow non-uniformities on the aircraft wing unsteady aerodynamic response. Current study investigates the effectiveness of SJAs for active control of unsteady flow over SD7003 low-Re airfoil in presence of a high-amplitude upstream flow disturbance characterized by a sharp-edge gust. In the employed numerical procedure, the actuator's dimensional scaling and excitation frequency effects are first examined for a specific SJA configuration using LEM model used in conjunction with RANS analysis to determine simple fluctuating-velocity boundary condition at the bottom of the actuator's orifice. The orifice with the properly defined boundary condition is then embedded into the airfoil surface for conducting highaccuracy viscous simulations of active flow control of gust-airfoil interaction. Results of numerical simulations indicate that the SJA positive effect on the airfoil response appears most significant with the actuator operating in resonance with von Karman shedding frequency.
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