Patent ID: 7726131

Claim:
A gas turbine combustor, within a plenum containing pressurized cooling air at a plenum pressure, the combustor comprising: an outer shell having an outer surface exposed to the pressurized cooling air and an inner surface exposed to combustion gases at a pressure lower than the plenum pressure; at least one floatwall panel, the floatwall panel attached to the inner surface of the outer shell and having a trailing edge having a downstream facing surface; at least one dilution hole in the floatwall panel near the trailing edge and in communication with the outer surface of the outer shell; and at least one local air impingement hole in the outer shell downstream of each at least one dilution hole and of the trailing edge downstream facing surface, directing the pressurized cooling air through the outer shell directly from the plenum at about the plenum pressure only at the downstream facing surface of the trailing edge of the floatwall panel, without the pressurized cooling air passing through any other passage other than the at least one local air impingement hole.