Abstract
The incompressible flow in the near wake of a NACA0012 airfoil is measured when the artificial roughness of a sandpaper strip is attached on the upper surface parallel to the leading edge. The strip location and the angle of attack are varied under constant roughness size and the fixed Reynolds number. The wake shape factor increases because of roughness, when compared with the smooth surface case regardless of the angle of attack. Its magnitude is larger when the strip is placed at the leading edge than that of the other cases. The velocity defect in the wake increases by the surface roughness. However, the turbulent intensity and the absolute value of the turbulent shear stress are reduced by the roughness.
Published Version
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