Abstract
It is necessary for a damage evaluation of Thermal Barrier Coatings (TBCs) to understand temperature and thermal stress fields in turbine blade. In the gas turbine, turbine blade surface temperature vary randomly due to fluctuation in combustion temperature. For the purpose of improving reliability of TBC and Porous-TBC (P-TBC) damage evaluation, the effect of harmonic oscillation on an unsteady state temperature field of TBC and P-TBC was clarified. As a result, it was found that the heating wave was reflected from pores, and surface temperature amplitude was attenuated. Furthermore, it is confirmed that the temperature amplitude decreased toward the interface.
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