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In a gas turbine, having a number of turbine blades/vanes respectively combined to form blade/vane rows, each of the turbine blades/vanes including an integrated cooling air duct, the cooling air requirement is to be kept particularly low in conjunction with reliable cooling of the turbine blades/va

In a gas turbine, having a number of turbine blades/vanes respectively combined to form blade/vane rows, each of the turbine blades/vanes including an integrated cooling air duct, the cooling air requirement is to be kept particularly low in conjunction with reliable cooling of the turbine blades/vanes. For this purpose, the turbine blades/vanes forming a first turbine blade/vane row and the turbine blades/vanes forming a second blade/vane row connected downstream thereof, viewed in the flow direction of the working medium, are connected one behind the other on the cooling air side with the intermediate connection of an injection device for water. During the operation of the gas turbine, the cooling air flowing out of the turbine blades/vanes forming the first blade/vane row is intercooled by the injection of water and is subsequently supplied to the cooling air ducts of the turbine blades/vanes forming the second blade/vane row.

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1. A gas turbine, comprising:a plurality of turbine blades/vanes respectively combined to form blade/vane rows, each turbine blade/vane including an integrated cooling air duct;wherein the cooling air ducts of the turbine blades/vanes forming a first turbine blade/vane row and the cooling air ducts

1. A gas turbine, comprising:a plurality of turbine blades/vanes respectively combined to form blade/vane rows, each turbine blade/vane including an integrated cooling air duct;wherein the cooling air ducts of the turbine blades/vanes forming a first turbine blade/vane row and the cooling air ducts of the turbine blades/vanes forming a second blade/vane row, which is downstream from the first turbine blade/vane row in a flow direction of a working medium, are connected together by an intermediate connection having an injection device for water. 2. The gas turbine as claimed in claim 1, wherein the first and the second blade/vane rows are respectively formed as a guide vane row by a plurality of guide vanes connected to a turbine casing. 3. The gas turbine as claimed in claim 2, wherein a number of the turbine blades/vanes have a number of cooling air outlets in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 4. A method of operating a gas turbine as claimed in claim 2, comprising:intercooling the cooling air, flowing out of the turbine blades/vanes forming the first blade/vane row, by the injection of water, andsupplying the intercooled water to the cooling air ducts of the turbine blades/vanes forming the second blade/vane row. 5. The method as claimed in claim 4, wherein, within a turbine blade/vane, a partial flow of the cooling air is branched off and mixed into the working medium by a number of cooling air outlets arranged in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 6. The gas turbine as claimed in claim 1, wherein the first and the second blade/vane rows are respectively formed as a rotor blade row by a number of rotor blades arranged on a turbine shaft. 7. The gas turbine as claimed in claim 6, wherein both rotor blade rows following one another in the flow direction of the working medium, and guide vane rows following one another in the flow direction of the working medium have cooling air ducts that are respectively connected together by the intermediate connection having an associated injection device for water. 8. The gas turbine as claimed in claim 7, wherein a number of the turbine blades/vanes have a number of cooling air outlets in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 9. A method of operating a gas turbine as claimed in claim 7, comprising:intercooling the cooling air, flowing out of the turbine blades/vanes forming the first blade/vane row, by the injection of water, andsupplying the intercooled water to the cooling air ducts of the turbine blades/vanes forming the second blade/vane row. 10. The method as claimed in claim 9, wherein, within a turbine blade/vane, a partial flow of the cooling air is branched off and mixed into the working medium by a number of cooling air outlets arranged in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 11. The gas turbine as claimed in claim 6, wherein a number of the turbine blades/vanes have a number of cooling air outlets in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 12. A method of operating a gas turbine as claimed in claim 6, comprising:intercooling the cooling air, flowing out of the turbine blades/vanes forming the first blade/vane row, by the injection of water, andsupplying the intercooled water to the cooling air ducts of the turbine blades/vanes forming the second blade/vane row. 13. The method as claimed in claim 12, wherein, within a turbine blade/vane, a partial flow of the cooling air is branched off and mixed into the working medium by a number of cooling air outlets arranged in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 14. The gas turbine as claimed in claim 1, wherein a number of the turbine blades/vanes have a number of cooling air outlets in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil. 15. A method of operating a gas turbine as claimed in claim 14, comprising:intercooling the cooling air, flowing out of the turbine blades/vanes forming the first blade/vane row, by the injection of water, andsupplying the intercooled water to the cooling air ducts of the turbine blades/varies forming the second blade/vane row. 16. The method as claimed in claim 15, wherein, within a turbine blade/vane, a partial flow of the cooling air is branched off and mixed into the working medium by the cooling air outlets. 17. A method of operating a gas turbine as claimed in claim 1, comprising:intercooling the cooling air, flowing out of the turbine blades/vanes forming the first blade/vane row, by the injection of water, andsupplying the intercooled water to the cooling air ducts of the turbine blades/vanes forming the second blade/vane row. 18. The method as claimed in claim 17, wherein, within a turbine blade/vane, a partial flow of the cooling air is branched off and mixed into the working medium by a number of cooling air outlets arranged in a region of a rear edge, relative to the flow direction of the working medium, of a blade/vane aerofoil.