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Previous Data on Radial Design Rotors Four NT154 radial rotors, of the same design discussed previously in this report, were produced in 2003 and 2004. The average surface roughness for these rotors was 30-40μin making the as-processed finish slightly better than the current rotors. Two of these rotors were sent to Oak Ridge National Lab (ORNL) for mechanical property evaluation. Another rotor was spin tested at Test Devices in Hudson, MA. Biaxial Flexure Testing ORNL conducted biaxial (ball on ring) flexure testing on samples machined from the blade and hub locations. The φ7mm x 1mm samples were either fully machined or preserved an as-processed (AP) surface on one side. The results of the room temperature testing, for one of the rotors, are shown in Figure 3. The data suggests that very good properties have been achieved in the rotors. There does appear to be some drop-off in the measured AP strength in the blade location. The AP blade samples have a natural curvature which possibly impacts the test data. There may also be some differences in the as-processed surface properties although surface roughness data does not support this. Figure 3: Room Temperature Biaxial Flexure Data for NT154 Radial Rotor Spin Testing One of the rotors produced in 2004 was spin tested at Test Devices in Hudson, MA. The rotor has an anticipated design speed of 97,500rpm in the application. The attachment to the arbor and balancing was conducted at Test Devices. A final unbalance of 0.048 g-in was achieved by minimal machining of three blade tips. The room temperature test was run in vacuum up to 143,330rpm, the maximum speed achievable with the equipment/setup used. The rotor survived the testing without failure. Based on FEA analysis (Figure 4)1, the rotor experienced stresses up to 490MPa (2.16 x 225.5) during the testing. The maximum stress location was on the as-processed surface at the root of the blades. 1 Kesseli et al, “Advancements in the IR PowerWorks Employing a Ceramic Turbine Rotor”, IGTI Conference, Atlanta, June 16, 2003. 123PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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