Turbine blade with tip rail cooling

Details Turbine blade with tip rail cooling Turbine blade with tip rail cooling

2008-08-21

2011-11-22

Such, Matthew W (Department: 2891)

Fluid reaction surfaces (i.e., impellers)

With fluid passage in working member communicating with...

Discharge solely at periphery normal to rotation axis

C416S09700R

Reexamination Certificate

active

08061987

ABSTRACT:
A turbine blade with a squealer pocket formed by a tip rail extending along the pressure side and suction side of the tip. A row of diffusion notches are spaced along the inner sides of the pressure side tip rail and the suction side tip rail, each notch formed by a peak and a valley and opening into the pocket to function as a diffuser. Each notch is supplied with cooling air through a tip convective cooling hole that opens into the bottom of each notch. The pocket floor is without tip cooling holes so that the cooling air discharged into the notches function to push away the vortex flow that would form along the inner side of the tip rails to improve the cooling effectiveness and reduce the tip rail metal temperature.

REFERENCES:
patent: 5192192 (1993-03-01), Ourhaan
patent: 6224337 (2001-05-01), Lieland et al.
patent: 2003/0021684 (2003-01-01), Downs et al.

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