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cooling. Thus, a higher quantity of lower temperature cooling air is available for cooling the CTD. Also the higher wall temperature can potentially enhance flame stability and therefore reduce CO and UHC emissions, especially at part power when flame temperature is lower. In addition, the ceramic liner may reduce design complexity by eliminating the impingement cooling shroud, decrease the risk of failure, and achieve lower cost. The main challenge for ceramic liner is its attachments to other parts, primarily due to different physical properties of ceramics. Rigid attachments do not allow the liner to withstand vibration or thermal expansion. The design of a suitable liner and metal attachment posed numerous challenges. Ceramics are difficult to design because of the relatively poor mechanical properties of the ceramic material and the specific requirements for integration within the overall combustor assembly. A number of liner/attachment concepts were examined that were finally narrowed to two candidate designs, viz., a flat-flange design shown in Figure 2.2.1, and a tapered-flange design shown in Figure 2.2.2 that appeared to have a lower cost. The former figure also shows the maximum principal stress results for the flat flange liner using an AS800 (silicon nitride) material. The maximum computed stress was well below the max stress for 1 in 1,000,000 failure probability at 30,000 hours, and the peak liner temperatures are also well below the maximum recommended temperatures for continuous use. Figure 2.2.1 Isometric view of combustor assembly (left). Maximum principal stresses calculated for the flat-flanged ceramic liner using AS800 material (right). 49PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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