Runner blade for low specific speed Francis turbine
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United States of America Patent
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May 1, 2007
Grant Date -
Nov 10, 2005
app pub date -
Jul 29, 2004
filing date -
May 5, 2004
priority date (Note) -
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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.
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