Runner blade for low specific speed Francis turbine
AssigneeBharat Heavy Electricals Ltd.
InventorA. L. Chandraker
Life of this patent
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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.
Claims5
A runner blade for low specific speed Francis turbine comprising a set of nine profiles covering crown, defining a first profile, to skirt, defining a ninth profile in accordance with Cartesian coordinate values X, Y, and Z and according to the Table 1, wherein each profile is made up of a pressure curve and a suction curve, both jointed at leading edge at one end and trailing edge at other end.
Dependencies are inferred from the claim text.