Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1983-04-27
1985-06-11
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244208, 244130, B64C 2108
Patent
active
045223602
ABSTRACT:
An airfoil for transonic speeds includes a porous top surface extending from a location about 50 to 60% of the chord length from a leading edge of the airfoil to a location about 80 to 90% of the chord length from the leading edge. A cavity is defined under the porous surface in the airfoil which has a depth of from 0.05 to 0.2% of the chord length. The porosity of the porous surface is chosen to be from 1 to 3% of the total airfoil surface and may be variable. The presence of the porous surface and cavity decrease airfoil drag at transonic speeds by providing a pathway between a high pressure area downstream of a shock wave formed on the airfoil at transonic speeds to a low pressure area within a bubble on the airfoil upstream of the shock wave.
REFERENCES:
patent: 2111530 (1938-03-01), De Seversky
patent: 2508288 (1950-05-01), Owner et al.
patent: 2956760 (1960-10-01), Attinello
patent: 4146202 (1979-03-01), Pender
NASA Facts, "Laminar Flow Control Technology" NF-86, Aug. 1979.
Bahi Lakhdar
Barnwell Richard
Bushnell Dennis
Nagamatsu Henry T.
Ross Janet
Barefoot Galen L.
Rensselaer Polytechnic Institute
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