Gas turbine engine with air and steam cooled turbine

摘要

In a gas turbine engine including a turbine which has a closed cycle steam cooling system and an open cycle gas cooling system sealing arrangements are provided between adjacent pairs of turbine rotor stages. The sealing arrangement has axially extending passages to supply cooling gas from one of the turbine rotor stages to the cooling gas passages in the turbine rotor blades. Each sealing arrangement comprises a pair of sealing formations each made up of a plurality of sealing segments. Also the sealing arrangement has axially extending passages to supply steam from one of the turbine rotor stages to the steam cooling passages in the turbine rotor blades.