| 摘要 |
PURPOSE: Techniques and apparatus for using the kinetic energy of a moving fluid stream and more particularly a cascade of aero- or hydro-foils oscillating in such a stream is provided which produce useful work, e.g. generate electricity, by removing energy from the stream or produce propulsion by adding externally supplied energy to create a negative drag. CONSTITUTION: Method and apparatus for converting the kinetic energy of a moving fluid stream into useful work is performed by using a cascade of thin aero of hydro foils (2) positioned therein. The foils is provided with at least two degrees of freedom and adjacent foils move out of phase. The foils are subjected to fluid induced oscillations known as flutter. Barriers (3, 43) is positioned downstream, above, or at the sides of the apparatus for increasing efficiency. A system of fly wheels (17, 18) to increase inertia of the foils is used with the hydrofoils. A cascade of aero of hydro foils is mechanically oscillated. |
