Patent ID: 7789125

Claim:
A method of impingement cooling an area of an inner wall of a gas turbine engine structure, wherein the area is aligned with an interfering structure comprising the steps of: positioning an impingement sheet to be spaced from an inner wall to be cooled, an air plenum defined on an opposed side of the impingement sheet from the inner wall, and said impingement sheet having a plurality of impingement sheet openings over a first portion of its area, and an interfering structure over a second portion of its area; positioning a baffle intermediate the impingement sheet and the inner wall; passing cooling air through said impingement sheet openings in the first portion of the impingement sheet, and into a collector plenum, and from the collector plenum into the baffle, and also to a space between the impingement sheet and the inner wall which is aligned with the interfering structure; then passing the cooling air through openings in the baffle and onto the inner wall, and from the inner wall outwardly through inner wall openings.