Patent ID: 8171634

Claim:
A method of producing a plurality of effusion holes in a wall of a combustor of a gas turbine engine, the method comprising the steps of: a) determining a hole pattern definition using: a count of the holes to be separated by first spaces in a row of holes along a first axis, positional information of a first hole in the row of holes, a first length of the row of holes, and, a first spacing ratio relating hole spacing distances between each adjacent hole within the row of holes, and further comprising determining the hole pattern definition using the geometric relation L 1 =aL 2 =a 2 L 3 =a 3 L 4 =a n−1 L n =( SR ) L n , where L 1 is a first hole spacing distance, a is a constant, n is the number of first spaces in the row of holes along the first axis, L n is a hole spacing distance associated with first space number n, and, SR is the first spacing ratio which is equal to a n−1 ; b) using the hole pattern definition to identify individual positions of the effusion holes to be produced in the wall of the combustor; and c) using a hole producing system to produce the effusion holes in the wall of the combustor at the identified positions.