Abstract
The control of drag and lift oscillation around a two-dimensional elliptical airfoil in a transonic regime is numerically investigated in the present study. In our laboratory, experimental researches on the control of both drag and lift oscillation around a circular cylinder, a square cylinder and an elliptical airfoil have been carried out, using small tabs. The objective of the present research is to make clear the detailed mechanism of reduction in drag and lift oscillation about the elliptical airfoil. As a result, it was found that small tabs make a virtual shape, and that the tabs push separation vortices, which cause the base drag, away from the airfoil. In addition, streamlines over the tabs are not largely curved in the wake. Therefore, the strength of shock waves produced on the airfoil is weakened, leading to a reduction in lift oscillation.
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