Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1992-12-07
1994-06-14
Huppert, Michael S.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
244204, 244198, B64C 2100
Patent
active
053203097
ABSTRACT:
The boundary layer of a fluid travelling in a mean-flow direction relative to a surface of a wall of a body is controlled by generating in a near-wall region of the flow a magnetic field B having flux lines parallel to the surface of the wall and an electric current density J traversing the magnetic flux lines in the fluid. An electrolyte or other conductivity-enhancing material is introduced into the flow to provide an electrical conductivity gradient in the near-wall region. The magnetic field B and the electric current density J create in the fluid a force J.times.B having a component normal to the surface of the wall that because of the increased conductivity gradient near the surface can stabilize or destabilize flow in the boundary layer. Numerous aspects of the fluid flow and its interaction with the body can thus be controlled. As examples, shear stress in the fluid at the wall can be decreased, with a corresponding reduction in viscous drag, the characteristics of the acoustic and pressure fields in the fluid surrounding the body can be controlled to reduce noise and fatigue, and boundary layer separation can be inhibited or induced.
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Brown Garry L.
Nosenchuck Daniel M.
Bidwell Anne E.
British Technology Group USA Inc.
Huppert Michael S.
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