Aft frame and method for cooling aft frame

An aft frame for a transition piece in a combustor, the combustor comprising the transition piece and an impingement sleeve at least partially defining a flow path therebetween, the aft frame comprising:

• a body defining a periphery;
• a cooling slot defined in the body and extending generally about a portion of the periphery of the body, the cooling slot defining an opening configured to accept a coolant;
• and
• an exhaust passage defined in the body, the exhaust passage comprising a first end in communication with the cooling slot and a second end configured for communication with the flow path for flowing a coolant therethrough.

A method for cooling an aft frame for a transition piece in a combustor, the combustor comprising the transition piece and an impingement sleeve at least partially defining a flow path therebetween, the method comprising:

• flowing a coolant through a generally radially extending cooling passage defined in the aft frame;
• flowing the coolant from the cooling passage into an exhaust passage in communication with the cooling passage;
• and
• exhausting the coolant from the exhaust passage into the flow path.