Patent ID: 7854591
Filing Date: 2010-12-21
Classification: F01D,F05D

Abstract:
1. An airfoil for a turbine of a gas turbine engine comprising: a main body comprising a wall structure defining an inner cavity adapted to receive cooling air, said wall structure including a plurality of first diffusion regions, at least one first metering opening extending from said inner cavity to each of said first diffusion regions so as to deliver cooling air from said inner cavity into each said first diffusion region, said wall structure further comprising at least one cooling circuit associated with each said first diffusion region, said cooling circuits each comprising: a second diffusion region; and at least one second metering opening extending from said respective first diffusion region to said second diffusion region so as to deliver cooling air from said respective first diffusion region into said second diffusion region, said at least one second metering opening including a length in a flow direction and first and second dimensions transverse to one another and to said length such that a first ratio of said length to said first dimension is equal to or greater than about 1.5:1 and a second ratio of said length to said second dimension is equal to or greater than about 1.5:1.