Energy Budgets and Performance Development of Turbulent Boundary-Layer control on airfoils

We present a comprehensive parametric study on the flow-control scheme denoted as wall-normal uni- form blowing and suction in turbulent boundary lay- ers around airfoils. The focus is primarily put on the influence of the drag caused by the power consump- tion of the support system. We also assess the theo- retical background of the momentum budget includ- ing free-stream and boundary-layer control flux. It is shown that this assessment is crucial if a complete un- derstanding and a reliable measurement of the drag in such system is desired in practice.