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US 2014/0271216 A1Published application
Horizontal axis wind or water turbine with forked or multi-blade upper segments
OwnerGeorge J. Syrovyinventor
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OwnerGeorge J. Syrovyinventor
Estimating the term…
Efficiency of a horizontal axis wind/water turbine (HAWT) is increased by the addition of a secondary blade associated with each main blade. The secondary blade is preferably a blade segment paralleling the main blade only in the outer reach of the main blade. The secondary blade travels rotationally ahead of the main blade and axially behind it, in an area in which air has not been disturbed by the main blades and in which disturbance of air by the secondary blade is not seen by the main blades. In one embodiment the secondary blade is carried by its associated main blade. In another embodiment, the secondary blades are carried by a ring or wheel which rotates with the main blades and the axle to which they are attached.
A horizontal axis wind or water turbine having a plurality of main blades, each of said blades having an extension blade attached thereto, the extension blade extending generally parallel with, rotationally ahead of, and axially behind said main blade and extending into an area of relatively low turbulence.
A horizontal axis wind or water turbine comprising two, three, or four main blades, and an equal number of extension blades, each extension blade being associated with a main blade and extending generally parallel with said main blade and extending into an area substantially free of turbulence caused by the main blades, each said extension blade being spaced axially from its said main blade by a distance between one half and six chords of said main blade, as measured at the midlength of said main blade.
A wind or water turbine having a tower and exactly two, three, or four outwardly extending main blades rotatably mounted to the tower for rotation about a generally horizontal axis, each main blade having associated therewith a secondary blade positioned closer to its associated main blade than to any other main blade, the main blades and the secondary blades all being mounted on an upstream side of the tower with respect to flowing air or water causing the blades to rotate.
Dependencies are inferred from the claim text.