Vortex shedding cyclical propeller
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 27, 2010
Grant Date -
Sep 20, 2007
app pub date -
Mar 14, 2006
filing date -
Mar 14, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A propeller having one or more blades eccentrically mounted to a shaft dynamically changes the blade pitch to produce free vortices in a fluid. For extracting energy from a moving fluid, the fluid flow acting on the blades rotates the propeller, while the pitch changes create a fluid flow pattern known as a von Karman vortex street. The resulting time averaged flow field distant from the propeller is a wake flow, and the energy of the fluid flow can be efficiently converted to rotation of a shaft driven device. For propulsion, applied shaft rotation and the dynamic pitch change in a fluid together create a flow pattern that is the inverse of the von Karman vortex street. For either energy extraction or propulsion, the propeller is particularly suited for low flow speeds, where the effects of low Reynolds number induced flow separation on blades may make other propellers inefficient.
First Claim
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