Runner blade for low specific speed Francis turbine

Details Runner blade for low specific speed Francis turbine Runner blade for low specific speed Francis turbine

2007-05-01

2007-05-01

Kershteyn, Igor (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing having tangential inlet or outlet

C416SDIG004

Reexamination Certificate

active

10901659

ABSTRACT:
A runner for use as retrofit in existing Francis turbine water path includes a set of nine profiles covering crown (hub) to skirt (band) area is to produce power efficently at deteriorated head condition of site. Each of the nine profiles is made of two curves, namely pressure and suction curves, meeting at two ends denoted as leading and trailing edge points. The runner exhibits better performance at specific speed value (ns,m) from 83 to 98, than the existing runner.

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patent: 6135716 (2000-10-01), Billdal et al.
patent: 6217285 (2001-04-01), Kurokawa et al.
patent: 6338610 (2002-01-01), Harada et al.

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