Kabushiki Kaisha Toshiba

Norio Ohtake

Koichi Kubo

Kazuyuki Nakamura

Toshifumi Kurokawa

Hideyuki Kawajiri

Nobuaki Noda

Madoka Narikawa

Sakito Anpuku

A vane body of a guide vane includes a leading edge, and a trailing edge which is located closer to a runner than the leading edge, when located radially outside the runner. A projection extending in a direction from the trailing edge toward the leading edge is provided on an internal-diameter side blade face of the vane body, at least in any one of one side area of the internal-diameter side blade face and the other side area thereof in an axial direction of a guide vane rotation shaft, the internal-diameter side blade face being disposed on a side of the runner. The projection has a projection rear end of an arcuate shape, which projection rear end is formed to extend along a rotation trajectory which is drawn by the trailing edge when the vane body is rotated about the guide vane rotation shaft.

Guide vane of hydraulic machinery and hydraulic machine

A camber line in a radial section of a runner vane has a curved part extending near the tip of the runner vane is convex toward the front surface of the runner vane. The runner vane is formed in a shape meeting a condition expressed by: &#x3c1;s&#x3c;&#x3c1;p, where &#x3c1;s is the radius of curvature of the back surface of the runner vane and &#x3c1;p is the radius of curvature of the front surface of the runner vane. The runner vane of this shape suppresses flows toward the tip thereof to moderate the variation of flow velocity in the turning direction. Consequently, loss can be reduced without impeding the recover of pressure in a draft tube.

Runner vane for axial-flow hydraulic machinery

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Yokohama, Japan

Norio Ohtake