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).