Structural Stress Analysis of an effusive cooled CMC liner

Kurzfassung

Oxide ceramic matrix composites (Ox-CMC) are reliable candidates for combustion purposes in gas turbine engines as they allow higher efficiency and environmental friendly use due to an increase of operation temperature. Within this scope the German project HiPOC (High Performance Oxide Ceramics) supported the development of Ox-CMC combustor liners as well as fluid dynamic and mechanical testing and analysis. This presentation reviews the structural stress analysis of an effusive cooled liner made of the Ox-CMC WHIPOX. The cylindrical liner with varying diameter is manufactured via oxide filament winding and ceramic slurry infiltration. After sintering effusion holes are drilled and their influence on the mechanical behaviour and temperature distribution was studied in finite element analysis (FEA). Then a complete model for the combustor liner with realistic boundary conditions representing attachment system and test facility is mechanically analysed. The experimental results from combustor test facility under real loading conditions and also from coupon testing are evaluated. Finally, a simple analytical method is presented which validates the FEA approach and the resulting hoop and axial stresses of the liner. Additional computer tomography analysis of as received state and after testing supports the interpretation of FEA and analytical evaluation of hoop and axial stresses of the thermally loaded combustor liner.