Patent ID: 8083486

Claim:
An air cooled turbine rotor blade comprising: an airfoil section having a leading edge, a pressure side wall and a suction side wall, and a blade tip; the airfoil being formed with a 3-pass serpentine flow cooling air circuit with a first leg located adjacent to the leading edge of the airfoil and a third leg located in a trailing edge region of the airfoil; a blade tip cooling channel connected to the first leg of the 3-pass serpentine flow circuit to provide cooling for the blade tip; a second leg of the 3-pass serpentine flow cooling circuit having a plurality of parallel and separated channels each being connected to the blade tip cooling channel, the plurality of parallel and separated channels each discharging into a collector cavity within a root section of the blade and, a metering hole for each of the parallel and separated channels to meter a cooling air flow and pressure into each of the channels.