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a brazed attachment where a tapered stub shaft integral to the ceramic rotor is brazed to a threaded low expansion alloy intermediary piece. The second concept uses a rotor with a wedge shaped bore. Additional spring loaded retention disks press into the angled surface of the disk. The two concepts are shown in Figure 2.1.25. Figure 2.1.25 Brazed attachment (left) and wedge attachment (right) These two attachment concepts were merged into one concept called the brazed wedge attachment, which is shown in Figure 2.1.26. The red lines depict the turbine rotor. The left side taper near the bore is brazed to a threaded low expansion alloy intermediary piece using an active metal braze. The right side of the rotor near the bore is forced in the axial, upstream direction by a preloaded bolt, into a rotating metal clamp. The torque is transmitted through friction with the clamp and the brazed joint. In the event of braze failure, the bolt/wedge assembly will ensure rotor retention. One or more belleville washers between the metal clamp and the bolt head will help maintain the clamping force when the bolt thermally expands. Figure 2.1.26 Brazed-Wedge attachment concept An FEA analysis of the rotor stub, braze foil and transition piece was performed. The assembly was cooled from the braze temperature, after which a torque and centrifugal 42PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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