Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Toshiba Energy Systems & Solutions Corporatton

Ryosuke Shima

Masahiko Nakazono

Toshifumi Kurokawa

Takero Mukai

Kotaro Tezuka

A startup method of a Francis turbine according to an embodiment includes: a first rotation-speed increasing step in which a rotation speed of the runner is increased by opening the guide vane at a first opening; a second rotation-speed increasing step in which the increase in the rotation speed of the runner is accelerated by opening the guide vane at a second opening that is larger than the first opening after the first rotation-speed increasing step; and a rotation-speed regulating step in which the rotation speed of the runner is regulated to a rated rotation speed by opening the guide vane at a no-load opening after the second rotation-speed increasing step. The first opening is an opening that is half or less than the no-load opening.

Startup method of francis turbine and francis turbine

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

Growing community of inventors

Kawasaki Kanagawa, Japan

Ryosuke Shima