Patent ID: 8205457

Claim:
A combustor for a gas turbine engine, the combustor comprising: a housing at least in part defining an internal combustion chamber of the combustor; a combustor component held in communication with the combustion chamber; and a ferrule generally coupled to the housing and being moveable relative thereto, the ferrule is moveable through a maximum range of transverse movement relative to said housing between a first position and a second position, the ferrule comprising: a primary opening through which the combustor component extends for support of the combustor component by said ferrule such that the combustor component is moveable conjointly with the ferrule relative to said housing; a plurality of sets of purge gas openings formed therein separate from and in transversely spaced relationship with the primary opening to allow purge gas to flow through the ferrule into the combustion chamber, each of the purge gas openings exiting the ferrule from the same planar surface, a first set of the plurality of purge gas openings uniformly spaced transversely from the primary opening a first distance, and a second set of purge gas openings uniformly spaced transversely from the primary opening a second distance greater than said first distance, at least one of said purge gas openings remaining unblocked at every position of the ferrule throughout said maximum range of transverse movement of said ferrule relative to said housing; the purge gas openings being located in the ferrule such that; in the first position of the ferrule at least one of the second purge gas openings being blocked against the flow of purge gas therethrough and at least one of the second purge gas openings being unblocked through which purge gas is permitted to flow into the combustion chamber; in the second position of the ferrule at least one of the blocked purge gas openings of said first ferrule position is unblocked to permit the flow of purge gas therethrough into the combustion chamber.