Turbine rotor blade, turbine rotor arrangement and method for manufacturing a turbine rotor blade

Abstract

A turbine rotor blade with a blade root, the blade root has, with respect to a direction of flow of a work medium circulating around the turbine rotor blade, a front end face and a rear end face. At least one of the front end face and the rear end face has at least one recess located at a distance to an edge of the respective end face.

What is claimed is: 
     
         1 . A turbine rotor blade comprising:
 a blade root, the blade root comprising, with respect to a direction of flow of a work medium circulating around the turbine rotor blade, a front end face and a rear end face,   wherein at least one of the front end face and the rear end face comprises at least one recess located at a distance to an edge of the respective end face.   
     
     
         2 . The turbine rotor blade according to  claim 1 ,
 wherein a contour of the recess is at least partly adapted to a contour of the edge of the respective end face.   
     
     
         3 . The turbine rotor blade according to  claim 1 ,
 wherein the blade root comprises a fir-tree-shape in cross-section with a convex bottom portion and at least one further convex portion located closer to an airfoil portion of the turbine rotor blade than the convex bottom portion, and   wherein the recess is mostly or completely located at the convex bottom portion.   
     
     
         4 . The turbine rotor blade according to  claim 1 ,
 wherein the recess is formed as a slot.   
     
     
         5 . The turbine rotor blade according to  claim 1 , further comprising
 at least one cooling channel passing through the blade root for conducting a cooling medium through the turbine rotor blade.   
     
     
         6 . A turbine rotor arrangement comprising
 at least one rotor disk, and   at least one rotor blade fixed to said rotor disk and radially extending from said rotor disk,   wherein the rotor blade is constructed according to  claim 1 .   
     
     
         7 . The turbine rotor arrangement according to  claim 6 , further comprising
 at least one axial locking plate, wherein a bar is formed between a bottom edge of the respective end face and a bottom edge of the recess, and wherein the bar comprises a slot opening radially inwards and encompassing a radially outside portion of the axial locking plate.   
     
     
         8 . A method for manufacturing a turbine rotor blade with a blade root, the method comprising:
 forming the blade root, with respect to a direction of flow of a work medium circulating around the turbine rotor blade, with a front end face and a rear end face,   forming at least one recess on at least one of the front end face and the rear end face, such that the recess is located at a distance to an edge of the respective end face.   
     
     
         9 . The method according to  claim 8 ,
 wherein the recess is formed using a casting process and/or a machining process.