Extending the life of power turbine disks that are corroded and damaged during operation

摘要

A repair method (72) for extending the effective life of a power turbine disk (12) with corrosion damage, where the power turbine (14) has stages (16, 18, 20, 22) and interstage voids (26). , 28, 30, 32), the repair method (72). Method (72) includes performing a first thermal analysis of the baseline structure of a corrosion-free baseline disk to determine the first steady-state temperature distribution (44). The corroded disc (12) is then machined to a depth suitable for repairing the corrosion to form a machined disc (76). A second thermal analysis of the processed disc is performed to determine the second steady temperature distribution of the processed disc (78). The first predicted safety cycle life (PSCL) at the disc axisymmetric shaped portions (1-10) of the processed disc is calculated (80). The second PSCL in the disc-shaped serrated portion (70) of the processed disc is calculated (82). In addition, the repair method (72) is certified (84) to ensure that the quality of the processed disc matches the new disc.