Turbine airfoil including diffusing trailing edge pedestals

Details Turbine airfoil including diffusing trailing edge pedestals Turbine airfoil including diffusing trailing edge pedestals

1992-11-24

1994-11-29

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

With heating, cooling or thermal insulation means

Changing state mass within or fluid flow through working...

416 97A, 416 90A, F01D 518

Patent

active

053684419

ABSTRACT:
A turbine airfoil having a cut-back trailing edge and a plurality of diffusing flow dividers upstream of the cut-back trailing edge is disclosed. Various construction details are developed which provide ejection of a diffusing film of cooling fluid over a cut-back trailing edge. In one particular embodiment, a turbine airfoil includes a plurality of radially spaced flow dividers extending between a pressure wall and a suction wall. Each flow divider includes a rounded leading edge, a pair of parallel sidewalls downstream of the leading edge, and a pair of converging sidewalls downstream of the parallel sidewalls. Adjacent sidewalls of adjacent flow dividers form flow channels having a constant area channel and a diffusing section. The diffusing section includes a covered portion upstream of the cut-back trailing edge and an uncovered portion extending over the cut-back trailing edge.

REFERENCES:
patent: 4303374 (1981-12-01), Braddy
patent: 4565490 (1986-01-01), Rice
patent: 4650949 (1987-03-01), Field
patent: 4653983 (1987-03-01), Vehr
patent: 5102299 (1992-04-01), Frederick

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