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The present study investigates and models the lift gains and losses generated by the superposition of a periodic actuation component onto a steady component on an airfoil with a highly deflected Coanda flap. The periodic actuation is provided by two synchronized specially-designed valves that deliver actuation frequencies up to 30 Hz and actuation amplitudes up to 20% of the mean blowing intensity. The lift gains/losses response surface is modeled using a data-driven sparse identification approach. The results clearly demonstrate the benefits of superimposing a periodic component onto the steady actuation component for a separated or partially-attached flow, where up to \(\varDelta C_l=0.47\) lift increase is achieved. On the other hand, this same superimposition for an attached flow is detrimental to the lift, with up to \(\varDelta C_l=-0.3\) lift reduction compared to steady actuation with similar blowing intensity is observed.

Sparse Model of the Lift Gains of a Circulation Control Wing with Unsteady Coanda Blowing