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a) (b) Figure 2.1.7 Maximum thermal stress in the vane during transient shutdown (a) integral vane ring at t=4 sec and (b) separate outer platform designs at t=5 sec Because of this high failure probability, the focus of the vane design activity turned towards making design modifications that would reduce the high stresses during transient conditions. The effects of platform thickness, attachment ring location, and end-wall contouring on transient stresses were evaluated. Table 2.1.1 lists the various design changes that were made and the resulting transient stress. The analysis was also repeated to account for the presence of environmental barrier coating (EBC) on the vane. A significant reduction in the transient stress from 59 ksi to 28.5 ksi was achieved when the attachment ring was relocated towards the trailing edge and the outer platform cooling was modified. Table 2.1.1 Design changes and transient stress Design Changes Maximum Principal Stress (ksi) Platform Modifications Baseline Separate outer platform Additional rings Thinner platforms 59.0 70.0 > 59 52.8 < 59 <4589.3 Attachment Location Baseline No attachment ring Move 0.2" to TE Fillets: 0.05 and 0.05" Fillets: 0.2 and 0.17" Fillets: 0.1 and 0.1" Endwall Contour 48.3 38.1 Revise Cooling < 48 65.1 > 48 < < 3 3 4 42 2 8 8. . 4 4 < < 4 4 4 4 4 4 8 8. . 8 8 < < 4 4 4 40 0 8 8. . 5 5 Baseline 34.1 Use effective h 28.5 < 30 26PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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