Main characteristics of suction control of flow separation of an airfoil at low Reynolds numbers

The suction control of flow separation of a NACA0012 airfoil is studied numerically for Reynolds number Re=104, angle of attack α=2°, 4°, 6°, and 8°, and Re=105, α=4°. The suppression effects of suction are studied considering many parameters such as suction coefficient, location, angle, hole width, and porosity. The variations in energy consumption and lift-drag ratio during the control process are used for evaluating the control effects.