Platform segment for supporting a nozzle guide vane for a gas turbine and method of cooling thereof

摘要

It is described a platform segment for supporting a nozzle guide vane for a gas turbine, the platform segment comprising: a gas passage surface (117, 119) arranged to be in contact with a streaming gas exhausted from a combustor; a cooling surface (131, 149) opposite to and thermally connected to the gas passage surface and arranged to be in contact with a cooling fluid; and a wall (133, 151) protruding from the cooling surface and extending at least partially in a direction of the streaming gas arranged circumferentially between adjacent guide vanes such that cooling fluid is channelled for cooling a downstream portion of the cooling surface.