Enhancement of a High-Lift Airfoil using Low-Power Fluidic Actuators

The performance of an airfoil equipped with a high-lift system based on a single-element flap configuration is enhanced by the manipulation of vorticity concentrations near the airfoil surface using spanwise arrays of fluidic jet actuators. Spanwise periodic flow injection downstream of the juncture between the main airfoil body and the flap leads to a significant increase in the extent of flow attachment along the flap. Consequently, a substantial increase in lift at large flap deflections is produced (at δ = 40o and α = 4o, the lift is increased by up to 66% relative to baseline). It is shown that the momentum coefficient Cμ required for a given lift increment can be reduced significantly through the use of multiple actuators and by appropriate integration of the actuator jets.

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