Experiment Demonstrating Reduction of Dynamic Stall by a Back-flow Flap
Anthony D. Gardner, Steffen Opitz, C. Christian Wolf, Christoph B. Merz, DLR
May 17, 2016
Experiment Demonstrating Reduction of Dynamic Stall by a Back-flow Flap
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- 12 pages
- SKU # : 72-2016-048
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Experiment Demonstrating Reduction of Dynamic Stall by a Back-flow Flap
Authors / Details: Anthony D. Gardner, Steffen Opitz, C. Christian Wolf and Christoph B. Merz, DLRAbstract
A back-flow flap attached to the suction side of an airfoil is investigated in both passively and actively actuated modes for the control of dynamic stall. Experiments in a low-speed wind tunnel at 50m/s were used to characterise the reduction in dynamic stall using pressure measurements on the midline of an airfoil. The pitching moment peak is reduced by an average of 25% for all deep stall test cases for active actuation of the flap, while for passive actuation the pitching moment peak is reduced by 19%. In each case the maximum lift remained the same, while the peak drag increased by anaverage of 2.5% for the active flap, and by 0.9% for the passive flap. With the flap closed at low angles of attack, the reference values of the airfoil are retained.
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Experiment Demonstrating Reduction of Dynamic Stall by a Back-flow Flap
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