Abstract
A water turbine comprises a runner, guide vanes formed of a plurality of vanes arranged outside the runner in a peripheral direction, each of the vanes being rotatable about a center axis thereof parallel with a rotation shaft of the runner, stay vanes formed of a plurality of vanes outside the guide vanes in a peripheral direction, and a casing covering the outside of the stay vanes, wherein sections of each vane of the guide vanes perpendicular to the center axis are displaced to the rotation direction of the runner from an upper side of the runner to a lower side, under the condition that the guide vanes are shutdown.
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