United Technologies Corporation

Indrik Linask

Joseph A Sylvestro

Brian K Beabout

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.

Turbine airfoil including diffusing trailing edge pedestals

A turbine airfoil having a baffleless cooling passage for directing cooling fluid toward a trailing edge is disclosed. Various construction details are developed which provide axially oriented, interrupted channels for turning a flow of cooling fluid from a radial direction to an axial direction. In a particular embodiment, a turbine airfoil has a cooling passage including a plurality of radially spaced walls, a plurality of radially spaced dividers downstream of the walls, and a plurality of radially spaced pedestals positioned axially between the walls and dividers. The walls and dividers define channels having an axial interruption permitting cross flow between adjacent channels. The cross flow minimizes the adverse affects of a blockage within a subchannel between adjacent walls. The pedestals are aligned with the subchannels such that cooling fluid exiting a subchannel impinges upon the pedestal.

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Tolland, CT, United States of America

Indrik Linask