US 8,011,888 B1Granted

Turbine blade with serpentine cooling

AssigneeFlorida Turbine Technologies, Inc.

InventorGeorge Liang

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Abstract

A turbine rotor blade with a first cooling circuit to provide cooling for the leading edge region of the airfoil and a suction side surface of the blade tip, and a second cooling circuit to provide cooling for the mid-chord region of the blade and the pressure side surface of the blade tip. The first cooling circuit includes a cooling air supply channel connected to a leading edge impingement cavity having showerhead arrangement of film cooling holes. The cooling air supply channel is connected to the suction side tip cooling channel that extends along the tip. The second cooling circuit includes a 3-pass forward flowing serpentine circuit with the third leg connected to a pressure side tip cooling channel that extends along the pressure side edge of the blade tip. Rows of tip cooling holes connect to both of the tip channels to discharge cooling air through the blade tip sections.

Claims10

Dependent claims

An air cooled turbine rotor blade comprising:

an airfoil having an airfoil cross sectional shape with a leading edge and a trailing edge, and a pressure side wall and a suction side wall both extending between the two edges;
a leading edge cooling air supply channel positioned adjacent to a leading edge region of the airfoil;
a leading edge impingement cooling cavity located on the leading edge of the airfoil;
a row of metering and impingement holes connecting the leading edge cooling air supply channel to the leading edge impingement cooling cavity to provide impingement cooling to a backside surface of the leading edge of the airfoil;
a showerhead arrangement of film cooling holes connected to the leading edge impingement cooling cavity;
a suction side tip cooling channel connected to the leading edge cooling air supply channel and extending to the trailing edge of the airfoil;
a row of suction side tip cooling holes connected to the suction side tip cooling channel;
a forward flowing serpentine flow cooling circuit having a first leg located adjacent to a trailing edge region of the airfoil and a last leg located adjacent to the leading edge cooling air supply channel;
a pressure side tip cooling channel connected to the last leg of the serpentine flow cooling channel and extending to the trailing edge of the airfoil;
and,
a row of pressure side tip cooling holes connected to the pressure side tip cooling channel.

8 more elements

Dependencies are inferred from the claim text.