Film cooling performance over an inclined surface

Experiments have been performed to study the adiabatic-wall film cooling effectiveness over a film-cooled surface which is made inclined at various angles with respect to a uniform flow. When the film-cooled surface is convergent, the mainstream can impinge and destroy the film jet structure, which can significantly reduce the film cooling effectiveness. For a large angle of inclination, the acceleration of flow can relaminarize the turbulent mixing of film jet with mainstream and increase the film cooling effectiveness. When the film-cooled surface is divergent, the mainstream can separate from the surface and the separation of flow can significantly increase the rate of mixing of film jet with mainstream and reduce the film cooling effectiveness. In the experiments, the angle of inclination of the film-cooled surface is ranged from-10° to 15°, and the blowing parameter from 0.5 to 2.3.