FRANCIS-TYPE TURBINE RUNNER AND FRANCIS-TYPE TURBINE
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United States of America Patent
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Issued Date -
Sep 9, 2021
app pub date -
Dec 15, 2020
filing date -
Mar 5, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
According to the embodiment, in a range from a plane P1 including a runner rotation center axis C and an end point 15E2 of an outlet end 15 of the vane 13, up to a plane P2 corresponding to a position where the plane P1 is moved by an angle, which is determined by dividing 360° by a value that is four times the number of vanes 13, in a runner rotation direction, when respective sections of the vane 13 are taken at a plane including the axis C and radially extending, in at least one section, a tangent T1 on a centerline Cv of the vane 13 passing through an intersection X at which the centerline Cv and a flowing water surface 12f intersect, and a tangent T2 on the flowing water surface 12f passing through the intersection X, define an acute angle on a negative pressure surface.
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