Cooled turbine blade and combined cycle power plant having gas turbine with this cooled turbine blade
AssigneeKabushiki Kaisha Toshiba
InventorsFumio Ohtomo, Tatsuo Araki, Asako Matsuura, Yoshiaki Tsukumo
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Abstract
A blade includes a blade body having a cavity, an insert inserted in the cavity, a plurality of impingement holes formed in a circumferential wall of the insert, and a recovery path for recovering a cooling medium sprayed from the impingement holes. The cooling medium can be recovered without being discharged into a main gas. A gas turbine having this blade is used for a combined cycle power plant. In this plant, steam is supplied as a cooling medium to the blade, and the steam recovered from the blade is supplied to a steam turbine.
Claims9
A cooled turbine blade through which a cooling medium passes, comprising:
- a blade body having cavities extending in a direction of spay, said cavities including at least a fore cavity formed in a front portion of said blade body and an aft cavity formed in a rear portion of said blade body;
- a fore hollow insert and an aft hollow insert mounted in said fore and aft cavities, respectively, an outer surface of a circumferential wall of said inserts and an inner wall surface of said blade body defining a gap therebetween, said circumferential wall of said inserts being provided with a plurality of impingement holes, and the cooling medium being sprayed from said impingement holes to said inner wall surface of said blade body;
- and
- recovery paths formed in one-end portions of said fore and aft cavities, respectively, the cooling medium sprayed from said impingement holes cooling a wall of said blade body and flowing in said recovery paths and being recovered from said blade body through said recovery paths.
Dependencies are inferred from the claim text.