Self-cooled orifice structure

A combustor comprising:

• a liner disposed about an axis and defining in-part a combustion chamber located radially inward and a cooling plenum located radially outward, and wherein a first plurality of film holes are in the liner and are in fluid communication between the cooling plenum and the combustion chamber, and are orientated to create a first cooling air film across the liner in the combustion chamber;
• and
• an orifice structure engaged to the liner and including a hot side panel defining in-part the combustion chamber, a cold side panel spaced from the hot side panel and exposed to the cooling plenum, a continuous inner wall extending between the hot and cold side panels and defining an orifice having a centerline and communicating axially through the hot and cold side panels with respect to the centerline, and a plurality of end walls in a cooling first cavity that is defined in-part by the hot and cold side panels and the inner wall, wherein each end wall of the plurality of end walls extend between and are engaged to the hot and cold side panels and are circumferentially spaced from the next adjacent end wall, and wherein a plurality of inlet apertures extend through the cold side panel and are in fluid communication between the cooling first cavity and the cooling plenum with each one of the plurality of inlet apertures being proximate to a first side of a respective one of the plurality of end walls, and wherein a plurality of outlet apertures extend through the hot side panel and are in fluid communication between the cooling first cavity and the combustion chamber with each one of the plurality of outlet apertures being associated with an opposite second side of the respective one of the plurality of end walls.