Abstract: Predictions of spanwise averaged effectiveness are presently made on the basis of a two dimensional injection model for the discrete hole injection process that is incorporated in a two dimensional boundary layer code using the low Reynolds number K ε two equation turbulent model. Attention is given to the cases of turbine blade with film cooling both on suction surface and pressure surface, including the influence of blowing rate, density ratio, turbulence intensity, ratio of hole space to hole diameter, location of single row and multi row. Two constants, entrainment fraction and aerodynamic drag coefficient used in the injection model, are modified for these cases. The agreement between predictions and experimental data are good.

Key words: turbine blade, film coo ling, inject ion model, turbulent model