Airfoil having expanded wall portions to accommodate film coolin

Details Airfoil having expanded wall portions to accommodate film coolin Airfoil having expanded wall portions to accommodate film coolin

1993-11-24

1997-11-18

Carone, Michael J.

Rotary kinetic fluid motors or pumps

With passage in blade, vane, shaft or rotary distributor...

416 97R, F01D 518

Patent

active

056881045

ABSTRACT:
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.

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