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- W2029043577 abstract "Effectiveness of the moving surface boundary-layer control in increasing lift and/or reducing drag at 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 test program. 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 CLICD from 2 to 80, whereas the flat plate at 90 deg 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 windtunnel tests. It shows, rather dramatically, the effectiveness of the moving surface boundary-layer control." @default.
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- W2029043577 date "1992-05-01" @default.
- W2029043577 modified "2023-10-16" @default.
- W2029043577 title "Drag reduction of bluff bodies through momentum injection" @default.
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- W2029043577 doi "https://doi.org/10.2514/3.46179" @default.
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