Combustor having secondary fuel injector

A combustor comprising:

• a transition duct comprising a transition duct liner defining an opening that extends through the transition duct liner;
• and
• a secondary fuel injector disposed in the opening, the secondary fuel injector comprising:
• an inner shell arranged to define an inner space;
• an outer shell cooperating with the inner shell to define an outer space that is annular;
• a plurality of inner flow guides positioned within the inner space and arranged around the inner shell, the plurality of inner flow guides arranged to turn a first mixture of fuel and air in one of a clockwise and counterclockwise direction around the inner shell, each inner flow guide of the plurality of inner flow guides comprising an airfoil shape having an inner flow guide pressure side wall and an inner flow guide suction side wall;
• and
• a plurality of outer flow guides positioned within the outer space and arranged around the inner shell, the plurality of outer airfoils arranged to turn a second mixture of fuel and air in the other of the clockwise and counterclockwise direction around the inner shell, each outer flow guide of the plurality of outer flow guides comprising an airfoil shape having an outer flow guide pressure side wall and an outer flow guide suction side wall,
• wherein the outer flow guide pressure side wall defines an outer flow guide fuel outlet.

A combustor comprising:

• a transition duct comprising a transition duct liner defining an opening that extends through the transition duct liner;
• and
• a secondary fuel injector disposed in the opening, the secondary fuel injector comprising:
• an inner shell arranged to define an inner space;
• an outer shell cooperating with the inner shell to define an outer space that is annular;
• a plurality of inner flow guides positioned within the inner space and arranged around the inner shell, each inner flow guide of the plurality of inner flow guides arranged to turn a first mixture of fuel and air in one of a clockwise and counterclockwise direction around the inner shell;
• and
• a plurality of outer flow guides positioned within the outer space and arranged around the inner shell, each outer flow guide of the plurality of outer flow guides arranged to turn a second mixture of fuel and air in the other of the clockwise and counterclockwise direction around the inner shell,
• wherein the outer shell defines a hollow outer shell interior to provide the fuel to the plurality of outer flow guides.

A combustor comprising:

• a transition duct comprising a transition duct liner defining an opening that extends through the transition duct liner;
• and
• a secondary fuel injector disposed in the opening, the secondary fuel injector comprising:
• an inner shell arranged to define an inner space;
• an outer shell cooperating with the inner shell to define an outer space that is annular;
• a plurality of inner flow guides positioned within the inner space and arranged around the inner shell, each inner flow guide of the plurality of inner flow guides arranged to turn a first mixture of fuel and air in one of a clockwise and counterclockwise direction around the inner shell;
• and
• a plurality of outer flow guides positioned within the outer space and arranged around the inner shell, each outer flow guide of the plurality of outer flow guides arranged to turn a second mixture of fuel and air in the other of the clockwise and counterclockwise direction around the inner shell,
• wherein each inner flow guide of the plurality of inner flow guides is in flow connection with one outer flow guide of the plurality of outer flow guides.