Film cooling effectiveness and turbulence distribution of discrete holes on a convex surface

The flow fields near the exits of a row of film cooling holes on a convex surface are measured. The data measured include the velocity vector, wall static-pressure distribution, turbulence profiles and film-cooling effectiveness. Near the dowstream edge of the hole, the recirculation zone induced by the mainstream around the jets is rather strong. Due to the curvature, the film jets have better attachment to the wall than to the flat plate for a blowing ratio (M) less than 1.0. For M greater than 1.0, film jets 'separate' from the wall near the injection holes. A partially parabolic hypothesis is used to predict the film-cooling flow field near the injection holes in a longitudinally curved channel.