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Figure 2.1.13 Temperature and maximum principal stress for the rotor with blade pull Figure 2.1.14 is a plot of the self-sustaining radius that was produced for this rotor design. The self-sustaining radius is defined as the radius where the axial growth of the disk equals the radial growth of a free spinning ring. The free ring displacement is a calculated value based on rpm, material density, radius, and Young’s modulus. The displacement due to thermal growth was added to this value. The disk displacement was obtained from the FEA model of the rotor. The self-sustaining radius is where these two lines intersect. Adding disk material outboard of the self-sustaining radius will increase bore stress. Adding material inboard of the self-sustaining radius can potentially reduce bore stress. For this design the area inboard of the self-sustaining radius was specifically shaped for the attachment design. As an exercise the area below the self-sustaining radius was significantly widened and the bore stress was reduce by 2,000 psi. 1.00E-02 8.00E-03 6.00E-03 4.00E-03 2.00E-03 Self Sustaining Radius 0.00E+00 0 0.5 1 1.5 2 2.5 3 Radius (in) Disk Displacement Free Ring Figure 2.1.14 Self sustaining radius determination for the ST5+ rotor disk A 1/27th cyclic symmetry model was developed and cyclic symmetry boundary conditions were applied to the cut disk faces. The rotor was constrained at one point in 33 Radial Displacement (in)PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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