Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1997-03-27
1999-03-23
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244130, 244204, B64C 2100
Patent
active
058848711
ABSTRACT:
A method is provided for hypersonic laminar flow control which uses the effect of boundary layer stabilization by an ultrasonically transparent coating. A hypersonic body surface is covered by the coating which absorbs the flow disturbance energy and does not trip the boundary layer flow. In one embodiment, the coating is made from a porous material of regular structure containing cylindrical blind microholes normal to the body surface. In another embodiment, the porous material has random distributions of pore shape and orientation. Extraction of the flow disturbance energy by pores causes stabilization of the boundary layer on the coated surface and leads to laminar-turbulent transition delay. The method can be used to decrease the aerodynamic drag of hypersonic vehicles and reduce heat transfer on vehicle surfaces.
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Fedorov Alexander V.
Malmuth Norman D.
Barefoot Galen L.
Boeing North American Inc.
Ginsberg Lawrence N.
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