Boundary layer devices

Details Boundary layer devices Boundary layer devices

1988-10-31

1989-09-12

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft structure

Details

244200, 114 67R, B64C 2110

Patent

active

048652717

ABSTRACT:
An aerodynamic or hydrodynamic surface is provided with so-called "riblets" for reducing drag by modification of the turbulent boundary layer. The riblets comprise flow-aligned elongate projections of small height. In order to increase their effectiveness in reducing drag, just those parts of the riblets which extend above the height of the virtual surface--established by the riblets themselves due to their displacing the turbulent motion away from the real surface--exhibit an abrupt transition to a cusp-shaped profile which more effectively promotes very small scale flow-aligned vortices which drain energy from the larger drag-inducing low speed flow-aligned vortices or "streaks" in the boundary layer.

REFERENCES:
patent: 4650138 (1987-03-01), Grose
patent: 4706910 (1987-11-01), Walsh
patent: 4736912 (1988-04-01), Loebert
NASA Tech. Brief, vol. 5, No. 2, Summer 1980.
Soderman, Aerodynamic Effects of Leading Edge Serrations on a 2-D Airfoil, NASA TM X-2643, 9-1972 p. 11.

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