Abstract
The present study investigates the lift gains generated by the superposition of a periodic actuation component onto a steady component on an airfoil with a highly deflected Coanda flap. The presented results are drawn from two experiments conduced in the water and in the wind tunnel. For the water tunnel experiment, periodic actuation is provided by two synchronized specially modified valves that deliver actuation frequency up to 30 Hz. For the wind tunnel experiment, the unsteady actuation is generated by 33 specially-designed individually-controlled lip segments that deliver actuation frequencies up to 300 Hz. The results demonstrate the benefits of superimposing a periodic component onto the steady actuation component for a separated or partially-attached flow, where a lift increase of up to \(\varDelta C_l =0.6\) is achieved. Among spanwise-varied actuation, the traveling wave yield the highest lift gains with a relatively high wave frequency and long wavelength.
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Semaan, R., El Sayed, Y., Loges, S., Noack, B.R., Radespiel, R. (2021). Active Flow Control Experiments on a High-Lift Configuration. In: Radespiel, R., Semaan, R. (eds) Fundamentals of High Lift for Future Civil Aircraft. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 145. Springer, Cham. https://doi.org/10.1007/978-3-030-52429-6_5
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