Hydro-turbine runner
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United States of America Patent
Stats
-
Jul 3, 2001
Grant Date -
N/A
app pub date -
Jun 2, 1999
filing date -
Mar 28, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A turbine disposed in a water passageway includes a hub and associated runner blades. Each blade comprises an inner edge and a distal outer edge, a leading edge and a trailing edge separated by a water directing surface. Each blade is rotatable relative to the hub about a blade rotational axis. The water passageway includes a spherically-shaped discharge ring that conforms to the outer edges of the blades to improve certain turbine parameters such as cavitation, efficiency, flow disturbance, and fish survivability. The turbine hub may also include a spherically-shaped outer surface in a region swept by the inner edges of the blades when the blades are rotated from maximum to minimum pitch, as well as seals attached to the inner edges of the blades. The hub may also be associated with blades in which the chord is reduced in the root region of the blade.
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