Fuel injectors and methods of use in gas turbine combustor

A combustor for a gas turbine, the combustor comprising:

• a liner defining a combustion chamber, the liner defining a head end, an aft end, and at least one opening therethrough between the head end and the aft end;
• and
• an axial fuel staging (AFS) system comprising:
• a fuel injector, the fuel injector being mounted to provide fluid communication through a respective one of the at least one opening in the liner, the fluid communication being directed in a radial direction with respect to a longitudinal axis of the liner;
• and
• a fuel supply line coupled to the fuel injector;
• wherein the fuel injector further comprises:
• a frame having interior sides defining an opening for passage of a first fluid;
• a fuel injection body coupled to the frame and being positioned within the opening such that flow paths for the first fluid are defined between the interior sides of the frame and the fuel injection body;
• wherein the fuel injection body defines a fuel plenum, and has a leading edge, an opposite trailing edge, and a plurality of fuel injection holes defined between the leading and trailing edges, the plurality of fuel injection holes in communication with the fuel plenum along at least one outer surface of the fuel injection body, wherein the fuel injection body comprises an upstream portion between the leading edge and the plurality of fuel injection holes, and a downstream portion between the trailing edge and the plurality of fuel injection holes;
• at least one mixing enhancing member coupled to the upstream portion of the fuel injection body, wherein the at least one mixing enhancing member is positioned between the plurality of fuel injection holes and the leading edge;
• a conduit fitting integral with the frame and fluidly connected between the fuel supply line and the fuel plenum;
• an outlet member, the outlet member being in fluid communication with the flow paths;
• and
• a mounting flange, wherein the frame extends radially outward from the mounting flange, and
• wherein the frame is configured to have a generally rectangular profile with walls, such that the conduit fitting is formed integrally with only one of the walls to provide fuel to the fuel plenum of the fuel injection body.