Film cooled blade or vane

摘要

The invention resides in a film cooled article such as a turbine engine blade or vane, having a wall with a hot surface (26) to be film cooled. The hot surface (26) includes a depression (48) featuring a descending flank (52) and an ascending flank (54) . Coolant holes (60) , which penetrate through the wall, have discharge openings residing on the ascending flank (54) . During operation, the depression locally over-accelerates a primary fluid stream F flowing over the ascending flank while coolant jets (70) concurrently issue from the discharge openings. The local over-acceleration of the primary fluid deflects the jets onto the hot surface and spatially constrains the jets thus encouraging them to spread out laterally and coalesce into a laterally continuous, protective coolant film. In one embodiment, the depression (48) is a trough (50) . In another embodiment, the depression is a dimple (72) .