Drag reduction method and surface

Details Drag reduction method and surface Drag reduction method and surface

1989-04-21

1992-07-28

Peters, Jr., Joseph F.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244130, 244203, B64C 2110

Patent

active

051335190

ABSTRACT:
Rearward facing microsteps (11, 12, 20, 21) are provided in a wall surface (10, 10a, 10b, 19, 19a, 19b) to reduce shear friction drag caused by wall surface bounded turbulent shear flows. Microsteps combined with phased tangential flow injection adjacent the microsteps are also described. These reduce the drag caused by eddy currents. The surface is useful in any setting where turbulent flow occurs to create eddy currents such as airplanes, boats, vehicles, conduits and the like.

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Walsh, AIAA 20th Aerospace Sci. Meeting, AIAA-0169, NASA Langley Research Center, Hampton, Va., Jan. 11-14, 1982.
Walsh, et al., AIAA 6th Applied Aerodynamics Conference, AIAA-88-2554, NASA Langley Research Center, Hampton, Va. Jun. 6-8, 1988.

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