Fluid energy converting method and apparatus

Details Fluid energy converting method and apparatus Fluid energy converting method and apparatus

1979-11-16

1982-08-31

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Method of operation

416 64, 416 79, 416 83, F03D 506

Patent

active

043470360

ABSTRACT:
There is disclosed a method and apparatus for converting the kinetic energy of a moving fluid stream into useful work by means of a cascade of thin airfoils positioned therein. In one embodiment, the airfoils are provided with at least two degrees of freedom and adjacent airfoils are movable out of phase. The airfoils are subjected to the aerodynamically induced oscillations caused by the aeroelastic phenomenon known as flutter and the oscillatory movement is then harnessed to do useful work. In an alternate embodiment, a cascade of airfoils is mechanically oscillated within a moving fluid stream to increase the propulsion of the fluid. Where the fluid is a liquid, the cascade includes a plurality of hydrofoils.

REFERENCES:
patent: 1486040 (1924-03-01), Schieferstein
patent: 3015476 (1962-01-01), Stuart
patent: 3040976 (1962-06-01), De Mattos
patent: 3508840 (1970-04-01), Lederlin
patent: 3783858 (1974-01-01), Ashikian
patent: 3924827 (1975-12-01), Lois
patent: 3995972 (1976-12-01), Nassar
patent: 4024409 (1977-05-01), Payne
patent: 4184805 (1980-01-01), Arnold

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