| 摘要 |
A turbine engine airfoil (34) includes an airfoil structure having a side (44) with an exterior surface (58). The structure includes a cooling passage (56) extending a length within the structure and providing a convection surface (72) facing the side. The convection surface (72) is twisted along the length, which varies a heat transfer rate between the exterior surface (58) and the convection surface (72) along the length. In one example, the cooling passage is provided by a refractory metal core (74) that is used during the airfoil casting process. The core includes multiple legs (76) joined by a connecting portion (78). At least one of the legs (76) is twisted along its length. The legs (76) are deformed toward one another opposite the connecting portion (78) to provide a desired core shape that corresponds to the shape of the cooling passage. Accordingly, the cooling passage (56) provides desired cooling of the airfoil. |
