Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1986-03-11
1990-06-12
Barefoot, Galen
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244204, 244130, 114 67A, B64B 2100
Patent
active
049326104
ABSTRACT:
The invention is a boundary flow control system and method which comprises heating elements 24 to trigger boundary layer transition and audio speakers 83 to provide acoustic suppression 51 of boundary layer turbulence 52. The trigger and suppression control are activated by a feedback amplifier 82 which reads boundary layer flow conditions using an anemometer probe 81. The active control of the boundary layer permits delay of flow separation and a reduction in skin friction drag as compared to natural flow conditions.
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Barefoot Galen
Glenn Charles E. B.
Helfrich George F.
Manning John R.
The United States of America as represented by the United States
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