Abstract
It is necessary for a damage evaluation of Thermal Barrier Coatings (TBC) to understand temperature and thermal stress fields in turbine blade. Those fields had been estimated based upon start-up, steady-state and stop operation. However, turbine blade surface temperature vary randomly due to fluctuation in combustion temperature. For the purpose of improving reliability of TBC damage evaluation, the effect of harmonic oscillation on a steady state temperature field of TBC and Porous-TBC (P-TBC) was clarified. As a result, it was found that the heating wave was reflected from pores, and temperature amplitude was attenuated. Furthermore, it is confirmed that the thermal diffusion length decreased with increasing angular velocity.
