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Figure 2.1.28 Brazing trial specimens. Gold based braze shown on left, TiCuSil ABA braze shown on right. 2.1.5 Foreign Object Damage Assessment The purpose of this study was to analytically determine the magnitude of increase in foreign object damage resistance (FOD) through reduction in blade count and making rotor blades thicker. Honeywell AS800 was used as the material as there was considerable gas shot impact data in the literature. A state of the art analytical code was employed to determine damage thresholds, using an elastic model for the material. Both the baseline ST5 geometry and the ST5+ thick blade geometry were modeled using the AS800 data. The foreign object used was considered to be a 0.010” diameter zirconia sphere, such as a spall from a thermal barrier coating within the combustor. Aerodynamic analysis was used to predict the speed and impact angle of the zirconia sphere. The results indicated a 50% reduction in damage at the impact site and a 40% reduction in post impact root stress when comparing the ST5 and ST5+ geometry. Figure 2.1.29 shows the foreign object rebounding from the ST5+ (thicker) blade. The same foreign object impact resulted in a hole in the ST5 blade, suggesting that the thicker ST5+ blade design was inherently more FOD resistant. 44PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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