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Table 1: Maximum Temperature and Stress in Two Ceramic Combustor Designs Material Design Flange Taper Max./Min. Max. Stress Temp (F) (Ksi) Max./Min. Max. Stress Temp (F) (ksi) Honeywell AS800 2103/1330 14.6 2103/1320 7.9 Hexoloy SA SiC 2081/1465 17.8 2080/1457 7.8 CoorsTek SCRB-210 2090/1391 16.6 2090/1392 8.1 Kyocera SN282 2103/1330 11.3 2103/1320 6.1 The monolithic ceramics were ranked according to their strength, resistance to thermal shock, and cost of manufacturing. Si-SiC was eliminated because of its low strength at room and elevated temperatures. In addition, SiSiC was also found to be prone to creep at stress and temperature regime expected for the ceramic combustor can. In-situ toughened Si3N4 offers the highest strength and toughness, but it is more costly than SiC. Considering that the ceramic combustor is not as highly stressed as ceramic turbine vanes and blades, SiC was selected as the primary candidate material for combustor can. Eigen value frequency analysis was also performed to determine if the thermo-acoustic and structural frequencies might lead to resonance. Baseline combustor configuration test was performed and the measured frequency-dependent impedance was incorporated in a thermo-acoustic model, which predicted that at 100% power, system instability most likely exists near 480 Hz. The analysis predicted that the vibration frequencies for the first three bulk modes for combustor were 1605, 2731, and 3648 Hz due primarily to the fact that CMC’s have high stiffness and low density. The vibration modes are shown in Figure 4. The first two frequencies are lower than 3000 Hz where thermo-acoustic frequencies are active, indicating that there is adequate dynamic excitation margin and resonance will not be an issue. Figure 4: Vibration modes: Eigen value analysis (amplified displacements) In addition to the combustor can material selection and design, there are several other elements under development to ensure that the overall combustor module can achieve the required life and performance. One such key element is a wave spring in the attachment design. The wave spring is used to mitigate the thermal 115PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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