Blade member and rotary machine

摘要

The airfoil member of the present invention is provided with an airfoil body, an end wall which is installed at an end part of the airfoil body, a fillet portion which smoothly connects the end part of the airfoil body with the end wall, and a cooling channel which allows a cooling medium to circulate inside the airfoil body and the end wall and in which two main channels are connected so as to bend in a folding manner at a return channel. The return channel is formed so as to run along the fillet portion on a cross section intersecting with a center line of a profile of the airfoil body and also formed in such a manner that the width thereof in the profile thickness direction is greater than the width of the main channel in the profile thickness direction.

主权项

1. An airfoil member comprising:
an airfoil body; an end wall which is installed at an end part of the airfoil body in a blade span direction and extends so as to intersect in the blade span direction; a fillet portion which smoothly connects the end part of the airfoil body with the end wall; and a cooling channel which allows a cooling medium to circulate inside the airfoil body and the end wall and in which two main channels extending along the blade span direction are connected so as to bend in a folding manner at a return channel formed on the end wall side, wherein the return channel is formed in a flat shape in which a length in the blade span direction is smaller than a length in a profile thickness direction so as to run along the fillet portion on a cross section intersecting with a center line of a profile of the airfoil body, the return channel is provided with an enlarged portion, wherein the width of the enlarged portion in the profile thickness direction is greater than the width of the main channel in the profile thickness direction, and a channel inner wall of the enlarged portion is expanded in the profile thickness direction, the channel inner wall of the enlarged portion is expanded outward from the end part of the airfoil body along a gas path surface of the fillet portion, and the return channel has a base part and a projection part, the projection part is formed at the center of the base part in the profile thickness direction and projects from the base part.