Abstract

Effectiveness of the Moving Surface Boundary-Layer Control (MSBC) in increasing lift and/or reducing drag a t a subcritical Reynolds number is studied, using a two dimensional wedge shaped airfoil and a flat plate at high angles of attack, through an extensive wind tunnel testprogram. Results suggest that injection of momentum, achieved here by introduction of bearing mounted, motor driven, hollow cylinders can significantly delay separation of the boundary-layer resulting in a narrow wake and the associated reduction in the pressure drag. Results show that both the cylinder surface velocity as well as the surface roughness have significant effect on the boundary-layer control. The wedge-airfoil showed an increase in CL/CD from 2 to 80 while the flat plate at 90 showed a reduction in drag coefficient by around 75%. A flow visualization study, conducted in a closed-circuit water tunnel using slit lighting and polyvinyl chloride tracer particles, complements the wind tunnel tests. It shows, rather dramatically, effectiveness of the moving surface boundary-layer control.

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