New model to calculate the film cooling effectiveness

A new mixing model for the discrete-hole injection process description was suggested with the conception of equivalent boundary layer and parameters of jet out ratio. This injection model was incorporated in a two-dimensional boundary layer code using the low Reynolds number k-ε two-equation turbulent model. The computation was carried out smoothly with the use of equivalent boundary layer. The conception of jet out ratio was used to account for the effect of cooling air penetrated through boundary layer. The calculation results show that the new model could be used to compute the film cooling effectiveness of discrete-hole injection process with higher blowing ratios.