Guide vane, guide vane cluster, and housing for a gas turbine as well as gas turbine having a platform with an arched wall section to receive a damper

A housing for a gas turbine, with a flow channel, comprising:

• a plurality of guide vanes each including:
• a radial outer end and a radial inner end,
• a platform connected to the radial outer end of the airfoil and the radial inner end of the airfoil being exposed,
• an upstream flange extending radially from the platform, and
• a downstream flange extending radially from the platform,
• wherein the flanges, together with a section of the platform lying between the flange, bound a groove extending in the circumferential direction of the gas turbine for the arrangement of a damper,
• wherein a wall section of the platform, between the upstream flange and the downstream flange and bounding the groove, has a radially arched shape at least in regions thereof in the direction of an opening of the groove;
• the wall section of the platform having a middle section, an axial upstream section and an axially downstream section;
• the middle section being more radially outward than the axial upstream section and the axial downstream section;
• a surface of the platform facing away from the groove being arched radially at least in regions thereof in the direction of the groove;
• and/or a plurality of guide vane clusters each including:
• at least two of the guide vanes connected to one another by way of at least one common platform for the radial bounding of a flow channel of the gas turbine;
• are arranged in a cascade manner, wherein the grooves of the guide vanes and/or the guide vane clusters extending in the circumferential direction of the gas turbine are aligned flush with one another, and wherein at least one damper is arranged in at least one of the grooves.