초록 ▼

A gas turbine rotating blade comprises a serpentine passage provided in the blade width direction in plural rows in a blade profile portion except the portion near the trailing edge having a small blade thickness, a steam cooling passage provided around the outer periphery of a platform, an air pass

A gas turbine rotating blade comprises a serpentine passage provided in the blade width direction in plural rows in a blade profile portion except the portion near the trailing edge having a small blade thickness, a steam cooling passage provided around the outer periphery of a platform, an air passage provided in the blade width direction in the vicinity of the trailing edge of blade profile portion, an impingement plate provided under the platform on the inside of the steam cooling passage, slot holes formed so as to branch off from the air passage and be directed to the trailing edge, and slits formed in the platform above the impingement plate. Therefore, the blade profile portion is cooled by the steam passing through the serpentine passage and the air passing through the air passage, so that the cooling construction is not complicated, and cooling is performed effectively. For the platform, the outer periphery thereof is cooled by steam and the inside thereof by air effectively.

대표청구항 ▼

[ We claim:] [1.] A gas turbine rotating blade which is cooled by allowing steam and air to flow separately in the rotating blade which operates in a high temperature gas, comprising: a serpentine passage for cooling a blade profile portion of said blade, and which communicates with a steam supply p

[ We claim:] [1.] A gas turbine rotating blade which is cooled by allowing steam and air to flow separately in the rotating blade which operates in a high temperature gas, comprising: a serpentine passage for cooling a blade profile portion of said blade, and which communicates with a steam supply port and a steam of said blade; a plurality of flow paths disposed in the blade width direction arranged in the chord direction of said blade; a steam cooling passage for cooling a platform of said blade in which a flow path communicating with said serpentine passage is formed around the outer periphery of said platform of said rotating blade; an impingement plate for cooling said platform by allowing the air supplied through an air supply port at the side of the blade root portion to impinge on said platform said impingement plate being disposed under said platform on the inside of said steam cooling passage; an air passage for cooling a trailing edge portion of said blade by introducing air having passed through said impingement plate and discharging it into a main flow gas from the blade end, said air passage being disposed in the blade width direction at the trailing edge portion of blade profile portion; slits for cooling said platform by introducing air having passed through said impingement plate and discharging it into the main flow gas said slits being formed in said platform in such a manner as to be inclined in the direction of the periphery of said platform; and slot holes for cooling the trailing edge portion of said blade by discharging the air separated from said air passage into the main flow gas, said slots being formed at intervals in the blade width direction from said air passage toward the trailing edge portion of said blade.