Hydroelectric in-pipe turbine blades
The special circumstances of working with hydroelectric turbines in pipes require innovations in blade shapes and systems that are presented here. An example is streamlining of the blades greater than that found in traditional hydroelectric turbines.
1. A turbine, comprising:
a central support member; and,
a plurality of cups arranged along the central support member in accordance with a direction of motion of the central support member, each of the cups in communication with the central support member, each of the cups including a closed leading edge oppositely disposed from an open trailing edge, a body intermediate the closed leading edge and the open trailing edge and tapering outward from the closed leading edge to the open trailing edge, the leading edge defining a first arc of a first radius of curvature and the trailing edge defining a second arc of a second radius of curvature, the first radius of curvature smaller than the second radius of curvature, and the cups are positioned with respect to each other such that leading edge of subsequent cup follows trailing edge of previous cup.
2. The turbine of claim 1 , wherein the leading edge terminates at a point.
3. The turbine of claim 1 , wherein the central support member is circular.
4. The turbine of claim 3 , additionally comprising, an inner periphery extending along the body proximate to the central support member, and an outer periphery, extending along the body, distal to the central support member and oppositely disposed from the inner periphery, that are asymmetrical.
5. The turbine of claim 3 , wherein the plane of the trailing edge of the cup is not perpendicular to the direction of motion of the cup.
6. The turbine of claim 2 , wherein each cup is attached to the central support member by an arm.
7. The turbine of claim 3 , wherein the cups attach to the central support member along the periphery of the turbine.
8. The turbine of claim 1 , wherein the outward taper is less than 45 degrees.
9. The turbine of claim 1 , additionally comprising: an internal cavity formed within the body extending from the closed leading edge to the open trailing edge.