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the axial direction and allowed to spin at 54,900 rpm. Figure 2.1.15 is a plot of maximum principal stress with the disk spinning at a uniform 70°F. The maximum stress occurs in the bore and is predicted to be 55,000 psi. Figure 2.1.15 Cold spin distribution of rotor maximum principal stress Figure 2.1.16 contains plots of the rim stress in the radial and hoop directions. Plots of radial stress were used to center the blade pull under the blade as much as possible. The blade was initially stacked so the center of gravity of each blade section lied on a radial line. The radial line was then leaned 0.020” in the positive axial direction. An examination of the hoop stress plot showed large areas of tensile stress in the leading edge fillet. Many attempts were made to reduce this stress but no design change that could significantly reduce the stress was found. The maximum radial blade pull was 30,000 psi while the maximum hoop stress was 40,000 psi. Radial Stress Stress Hoop Stress Stress Figure 2.1.16 Cold spin rim hoop and radial stress Figure 2.1.17 contains plots of the temperature and maximum principal stress distribution in the hot spinning rotor. Convective heat transfer coefficients and sink temperatures 34PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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