Annular flow channel section for a turbomachine

Abstract

An annular flow channel section for a turbomachine is provided. The annular flow channel includes a guide vane ring having a number of guide vanes which are arranged next to each other in the circumferential direction, each guide vane including a vane base, a platform and an airfoil that projects into the flow channel in a radiating pattern. The flow channel is delimited on the platform side by shielding elements, each of which being disposed between two immediately adjacent airfoils, wherein the shielding elements are arranged on the platforms for creating a particularly space-saving flow channel section while creating a gap, and impingement-cooling openings are provided in the platform.

1 - 5 . (canceled) 
     
     
         6 . An annular flow passage section for a turbomachine, comprising:
 a stator blade ring including a plurality of stator blades arranged in series in a circumferential direction and each stator blade comprises:
 a blade root which is provided for the fastening, 
 at least one root-side platform with two platform halves, and 
 a blade airfoil which projects radially into the flow passage, 
   wherein the flow passage, on the platform side, is delimited by a plurality of shielding elements, of which one shielding element in each case is arranged between two directly adjacent blade airfoils, butting against these, and covers a gap which is delimited by the platform halves of directly adjacent stator blades,   wherein the plurality of shielding elements are arranged on the platforms, forming a gap, and   wherein a plurality of impingement cooling holes are provided in the platforms for impingement cooling of the plurality of shielding elements.   
     
     
         7 . The flow passage section as claimed in  claim 6 , wherein the plurality of shielding elements include in each case a baseplate, consisting of a metallic material, which delimits the flow passage and is produced separately from the plurality of stator blades. 
     
     
         8 . The flow passage section as claimed in  claim 7 , wherein a first wall thickness of the baseplate is less than a second wall thickness of the platforms which are covered by a shielding element. 
     
     
         9 . The flow passage section as claimed in  claim 7 , wherein provision is made on the baseplate for transversely arranged wall sections which are connected to sidewalls of the platforms. 
     
     
         10 . The flow passage section as claimed in  claim 8 , wherein provision is made on the baseplate for transversely arranged wall sections which are connected to sidewalls of the platforms. 
     
     
         11 . The flow passage section as claimed in  claim 6 , wherein each shielding element includes a protective coating on the flow passage side. 
     
     
         12 . The flow passage section as claimed in  claim 9 , wherein each shielding element includes a protective coating on the flow passage side.