Rotor for an axial-throughflow turbomachine and moving blade for such a rotor

摘要

A rotor is provided for an axial-throughflow turbo machine, which carries a plurality of moving blades which are each pushed with a blade root into a rotor groove extending about the axis and are held. The blade root includes a hammer root with a hammerhead and is supported on radial stop faces of the rotor groove which lie further outward in the radial direction, against centrifugal forces acting on the moving blades, and are supported on axial stop faces lying further inward in the radial direction, against axial forces which act on the moving blade. The rotor groove has at its bottom, to reduce thermal stresses, an axially and radially widened bottom region with a continuously curved cross-sectional contour. In such a rotor, an advantageous adaptation of the blading is achieved by the blade root of the moving blades being adapted to the widened bottom region in the radial direction.

主权项

1. A rotor for an axial-throughflow turbomachine, the rotor carries a plurality of moving blades which are pushed, in each case, with a blade root into a rotor groove extending about an axis and are held there, with the blade root comprising a hammer root with a hammerhead and being supported on radial stop faces of the rotor groove which lie further out in the radial direction, against centrifugal forces which act on the plurality of moving blades, and being supported on axial stop faces lying further inward in the radial direction, against axial forces which act on the plurality of moving blades, the rotor groove having at a bottom portion, in order to reduce thermal stresses, an axially and radially widened bottom region with a continuously curved cross-sectional contour, wherein the bottom region radially extends beyond a lowermost stop face, and the bottom region is axially widened beyond the radial and axial stop faces, the blade root of the plurality of moving blades is adapted to the widened bottom region in a radial direction; and
wherein the widened bottom region has a predetermined maximum width (d1) in an axial direction, the radial stop faces have a predetermined minimum distance (d5) in the axial direction, and a ratio of the minimum distance (d5) to the maximum width (d1) is between 0.1 and 0.6, namely 0.1