United Technologies Corporation

Brian K Beabout

Joseph A Sylvestro

Indrik Linask

An internally cooled airfoil includes film cooling holes extending through an expanded section of the wall. Various construction details are developed which provide long film cooling holes resulting in convective cooling and film cooling of the outer surface of the airfoil downstream of the cooling hole. In a particular embodiment, the airfoil includes a wall having an expanded section and a canted shaped cooling hole. The shaped cooling hole includes a metering section having a length L.sub.2 and a diffusing section having a length L.sub.3. The expanded section has a thickness T.sub.e, measured along the direction of the cooling hole, sufficient to accommodate the total length L.sub.1 of the cooling hole.

Airfoil having expanded wall portions to accommodate film cooling holes

Cooling of a turbine airfoil such as a turbine stator vane in a gas turbine engine is enhanced by the provision of additional cooling air through a secondary air inlet communicating with a medial portion of an internal, serpentine cooling air passage.

Turbine airfoil with enhanced cooling

Method of manufacturing a turbine airfoil with enhanced cooling

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.

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Coventry, CT, United States of America

Brian K Beabout