Failure analysis in after shell section of gas turbine combustion liner under base-load operation |
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Authors: | Kyung Min Kim Namgeon Yun Yun Heung Jeon Dong Hyun Lee Hyung Hee Cho |
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Affiliation: | Department of Mechanical Engineering, Yonsei University, 134, Sinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;Universidad Politécnica de Madrid |
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Abstract: | The present study investigates the failure analysis and the lifetime prediction in the after shell section of gas turbine combustion liner with internal cooling passages called C-channel. To calculate distributions of temperature and stresses, 3D-numerical simulations using FVM and FEM commercial codes are performed. As a result, the discrepancy in thermal expansion between hot and coolant side walls induces high thermal stresses in the welding region and above the divider of the C-channel. Thus, these two regions are much weaker than the other regions. The locations match well to those of thermal cracks in actual gas turbine combustors in service. |
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