Kabushiki Kaisha Toshiba

Other

Toshiba Energy Systems & Solutions Corporatton

Kotaro Tezuka

Kazuyuki Nakamura

Toshifumi Kurokawa

Takanori Nakamura

Masahiko Nakazono

Yasuyuki Enomoto

Takero Mukai

Akira Shinohara

Ryosuke Shima

According to the embodiment, in a range from a plane Pincluding a runner rotation center axis C and an end pointEof an outlet endof the vane, up to a plane Pcorresponding to a position where the plane Pis moved by an angle, which is determined by dividing 360&#xb0; by a value that is four times the number of vanes, in a runner rotation direction, when respective sections of the vaneare taken at a plane including the axis C and radially extending, in at least one section, a tangent Ton a centerline Cv of the vanepassing through an intersection X at which the centerline Cv and a flowing water surfaceintersect, and a tangent Ton the flowing water surfacepassing through the intersection X, define an acute angle on a negative pressure surface.

Francis-type turbine runner and Francis-type turbine

A hydraulic machine having a hydro turbine runner which has a crown at a center and a band along an outer periphery, and is formed around the axis of rotation, long blades which are arranged along the circumferential direction of the axis of rotation, and whose center-side ends are supported by the crown, and periphery-side ends are supported by the band, and short blades which are arranged between the long blades, and whose center-side ends are supported by the crown, periphery-side ends are supported by the band, and rear edges are curved in a rotation direction of the hydro turbine runner in turbine operation, on a plane of projection perpendicular to the axis of rotation.

Hydraulic machine

A Francis pump-turbine includes a runner provided with runner blades arranged around in a circumferential direction of a main shaft of the runner, each of the runner blades being supported by a band at a bottom side thereof in a blade height direction and supported by a crown at a head side in the blade height direction, in which the runner blade is formed, at a trailing edge thereof, with a curved portion expanding to the main shaft when the turbine is in operation, the curved portion has a maximum point with respect to a straight line connecting a crown-side trailing edge connecting end at which the trailing edge and the crown are connected and a band-side trailing edge connecting end at which the trailing edge and the band are connected, and an angle &#x3b1; formed by a straight line connecting the maximum point and the crown-side trailing edge connecting end and a straight line connecting the maximum point and the band-side trailing edge connecting end is set to be within a range of &#x3b1;&#x2266;150&#xb0;.

Francis pump-turbine

Growing community of inventors

Yokohama Kanagawa, Japan

Kotaro Tezuka