Patent ID: 6238183
Filing Date: 2001-05-29
Classification: F01D,F05D,Y02T

Abstract:
A gas turbine engine airfoil having an internal air system including air delivery impingement holes having a certain predetermined width, wherein, in use, the air system may carry particles of sufficiently large size to block the air delivery impingement holes, the airfoil including a partition member having an inlet area through which the internal air passes via at least one of said air delivery impingement holes comprised of an impingement hole exit aperture of said predetermined width in the downstream surface of the partition member, and a non-circular impingement hole entry aperture formed in the upstream surface of the partition member which has a minor dimension less than or equal to the impingement hole exit aperture width whereby to exclude particles of greater size and a substantially larger major dimension such that the passage of air into the air delivery impingement hole is largely unaffected by particles which becomes trapped in the impingement hole entry aperture.