Air and steam cooled platform of a turbine blade or vane

Abstract

A turbine blade or vane includes a platform that is cooled by way of air and steam. The air cooling may form an open circuit, where the steam cooling may form a closed circuit.

What is claimed is:  
     
         1 . A turbine blade or vane, comprising: 
 a platform being both air and steam cooled.    
     
     
         2 . The turbine blade or vane as claimed in  claim 1 , wherein the air cooling forms an open circuit.  
     
     
         3 . The turbine blade or vane as claimed in  claim 1 , wherein the steam cooling forms a closed circuit.  
     
     
         4 . The turbine blade or vane as claimed in  claim 1 , wherein the platform is air cooled in an outer region.  
     
     
         5 . The turbine blade or vane as claimed in  claim 1 , wherein an inner region of the platform is steam cooled.  
     
     
         6 . The turbine blade or vane as claimed in  claim 4 , wherein the cooling in the outer region is affected by impingement cooling.  
     
     
         7 . The turbine blade or vane as claimed in  claim 5 , wherein the cooling in the inner region is affected by impingement cooling.  
     
     
         8 . The turbine blade or vane as claimed in  claim 6 , wherein the platform includes at least one impingement cooling insert.  
     
     
         9 . The turbine blade or vane as claimed in  claim 6 , wherein the outer region has at least one impingement cooling insert.  
     
     
         10 . The turbine blade or vane as claimed in  claim 7 , wherein the inner region has at least one impingement cooling insert.  
     
     
         11 . The turbine blade or vane as claimed in  claim 1 , wherein film cooling of the platform is affected by the air cooling by way of at least one film cooling bore.  
     
     
         12 . The turbine blade or vane as claimed in  claim 9 , wherein the impingement-cooling insert of the inner region and the impingement-cooling insert of the outer region are formed integrally.  
     
     
         13 . The turbine blade or vane as claimed in  claim 2 , wherein the platform is air cooled in an outer region.  
     
     
         14 . The turbine blade or vane as claimed in  claim 2 , wherein an inner region of the platform is steam cooled.  
     
     
         15 . The turbine blade or vane as claimed in  claim 3 , wherein an inner region of the platform is steam cooled.  
     
     
         16 . The turbine blade or vane as claimed in  claim 7 , wherein the platform includes at least one impingement cooling insert.  
     
     
         17 . The turbine blade or vane as claimed in  claim 10 , wherein the impingement-cooling insert of the inner region and the impingement-cooling insert of the outer region are formed integrally.  
     
     
         18 . The turbine blade or vane as claimed in  claim 2 , wherein the steam cooling forms a closed circuit.  
     
     
         19 . The turbine blade or vane as claimed in  claim 4 , wherein an inner region of the platform is steam cooled.  
     
     
         20 . The turbine blade or vane as claimed in  claim 18 , wherein the platform is air cooled in an outer region and wherein an inner region of the platform is steam cooled.