Axial Compressor for a Gas Turbine Having Passive Radial Gap Control

Abstract

An axial compressor for a gas turbine having passive radial gap control is provided. The axial compressor includes a guide vane support on which guide vanes are fastened so as to be arranged in a ring, wherein the vane tips of the guide vanes lie opposite a wall section. Thermal insulation is attached to the wall section in the section lying opposite the vane tips in order to equalize the expansion behavior of the guide vane support and the wall section, which by themselves react thermally in different manners, wherein the terminal insulation is matched in the heat input delay effect thereof to the wall section and to the guide vane support in such a way that the thermal expansion behavior of the guide vane support and the wall section is at least equalized over time during transient operation of the axial compressor.

1 .- 8 . (canceled) 
     
     
         9 . An axial compressor for a gas turbine, comprising:
 a guide vane ring fastened to a guide vane carrier;   a plurality of guide vanes;   a wall portion; and   a heat insulation,   wherein vane tips of the plurality of guide vanes lie on a hub side,   wherein the vane tips are opposite the wall portion and in between the vane tips and wall portion a radial gap is formed,   wherein the wall portion reacts thermally more quickly in relation to the guide vane carrier,   wherein a wall cover of the wall portion is configured as a rotationally fixed shaft cover, and   wherein heat insulation is provided on the wall portion and delays a heat introduction upon the wall portion and upon the guide vane carrier in such a way that the thermally induced expansion behavior of the guide vane carrier and the wall portion is substantially equalized over time during a transient operation of the axial compressor.   
     
     
         10 . The axial compressor as claimed in  claim 9 , wherein the heat insulation is designed in the form of a segmented ring using a plurality of circumferential segments. 
     
     
         11 . The axial compressor as claimed in  claim 10 , wherein the heat insulation includes a plurality of sealing elements which are provided between the plurality of circumferential segments. 
     
     
         12 . The axial compressor as claimed  claim 9 , wherein the heat insulation is fastenable to the wall portion. 
     
     
         13 . The axial compressor as claimed in  claim 12 , wherein the heat insulation is fastenable to the wall portion by a hooking means and/or a screwing means. 
     
     
         14 . The axial compressor as claimed in  claim 9 , wherein the heat insulation is designed as a heat protection layer applied to the wall portion. 
     
     
         15 . The axial compressor as claimed in  claim 14 , wherein the heat protection layer is a ceramic heat insulation layer. 
     
     
         16 . The axial compressor as claimed in  claim 9 , wherein the guide ring carrier is designed as a casing. 
     
     
         17 . The axial compressor as claimed in  claim 9 , wherein the plurality of guide vanes faun at least two guide vane rings which lie next to one another and the radial gaps of which are controlled by the heat insulation.