Patent ID: 7563073
Filing Date: 2009-07-21
Classification: F01D,F05D

Abstract:
1. A film cooling hole for cooling a surface exposed to a hot gas flow, the film cooling hole comprising: a metering hole in fluid communication with a cooling air supply channel; a first diffusion slot located downstream from the metering hole; a second diffusion slot located downstream from the first diffusion slot, the second diffusion slot opening onto the surface to be cooled; the first and the second diffusion slots both have a radial outward expansion of from zero to 3 degrees with respect to the centerline of the metering hole; the first diffusion slot has a radial inward expansion of from 7 to 13 degrees with respect to the centerline of the metering hole; and, the second diffusion slot has a radial inward expansion of from 14 to 26 degrees with respect to the centerline of the metering hole.