Patent ID: 8171737

Claim:
A combustor assembly for a turbine, comprising: a generally cylindrical flow sleeve; a generally cylindrical combustor liner that is concentrically mounted inside the flow sleeve, wherein compressed air flows through a space formed between an exterior of the combustor liner and an interior of the flow sleeve; a generally cylindrical combustor casing attached to an end of the flow sleeve; a cap mounted in the combustor casing, the cap including a generally cylindrical outer sleeve and a generally cylindrical inner sleeve that is concentrically mounted inside the outer sleeve, wherein an end of the combustor liner is coupled to an aft end of the inner sleeve such that compressed air flowing between the flow sleeve and the combustor liner flows into a space between the inner and outer sleeves of the cap, wherein the inner and outer sleeves are positioned with respect to each other such that a volume of the air passing through the space between the inner and outer sleeves gradually increases as the air passes from the aft end of the cap to the forward end of the cap, wherein the aft end of the inner sleeve of the cap has a step that includes a small diameter portion and a large diameter portion, wherein the end of the combustor liner that is coupled to the inner sleeve surrounds the small diameter portion; and wherein an outside diameter of the end of the combustor liner that is coupled to the inner sleeve is substantially the same as the outside diameter of the large diameter portion of the step.