Influence of different film cooling arrangements on endwall cooling

The complex large scale coherent vortex systems which originate and develop through the endwall passage have strong interaction with the film cooling flows near the endwall. Two full coverage film cooling arrangements on a typical flat vane endwall were investigated experimentally. The influence of coolant mass flow rate and density ratio on each configuration was studied. Detailed measurements of adiabatic film cooling effectiveness distribution were conducted using PSP technique. The characteristics of different film cooling arrangements were analyzed. As the coolant mass flow rate rises, the film cooling coverage becomes better for both configurations. The influence of density ratio on film cooling distribution is quite complex. The results indicate that the configuration with iso-pressure line distributed film cooling has a more uniform distribution of film cooling effectiveness while the configuration with axial distributed film cooling has a better coverage mainly downstream of the passage.