Lifetime Prediction of Film Cooling Systems with and without Thermal Barrier Coating

Abstract

The present study investigated temperature, thermal stress, and the lifetime in film cooling systems with and without thermal barrier coating. 3D-numerical simulations using a FEM commercial code were conducted to calculate distributions of temperature and thermal stresses. In the simulations, the surface boundary conditions used the surface heat transfer coefficients and adiabatic wall temperature which were converted from the Sherwood numbers and impermeable wall effectiveness obtained from previous mass transfer experiments. Then, the lifetime of the film cooling systems is predicted using thermal analysis data and the material creep data. The minimum lifetime is approximately 1,100 hours on the sides of the hot side surface in case without TBC.