Control of laminar flow in fluids by means of acoustic energy

Details Control of laminar flow in fluids by means of acoustic energy Control of laminar flow in fluids by means of acoustic energy

1986-10-14

1989-02-07

Barefoot, Galen

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244204, 244130, B64C 2300

Patent

active

048026425

ABSTRACT:
Retarding of the point of transition from laminar flow to turbulent flow in aerodynamic boundary layers on the surfaces of aircraft is accomplished by radiating acoustic energy at frequencies greater than twice the critical Tollmein-Schlichting frequency into the boundary layer. The acoustic energy interferes with the formation of Tollmein-Schlichting waves, thereby increasing the incidence of laminar flow and reducing aerodynamic drag.

REFERENCES:
patent: 2783008 (1957-02-01), Bodine, Jr.
patent: 3117751 (1964-01-01), Rogers et al.
patent: 3774867 (1973-11-01), Quinn
patent: 4516747 (1985-05-01), Lurz
patent: 4693201 (1987-09-01), Williams et al.

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