Axial fuel stage injector with axially elongated mixing chambers, and combustor and gt system including same

A combustor for a gas turbine system, the combustor comprising:

• a combustor body including a combustion liner;
• and
• a plurality of axial fuel stage (AFS) injectors directed into the combustion liner, each AFS injector including:
• a mixing member including:
• a plurality of axially elongated mixing chambers defined in the mixing member, each axially elongated mixing chamber including an inlet and an outlet, wherein each outlet is configured to be in fluid communication with a combustion chamber of the combustor, and
• a set of fuel injectors defined in opposing side walls of each axially elongated mixing chamber;
• a high pressure (HP) air injection member defining a sets of HP air jets, wherein each set of HP air jets is configured to direct HP air from a HP air source into the inlet of a respective axially elongated mixing chamber where fuel is injected by the set of fuel injectors;
• a filter member upstream of the sets of HP air jets;
• and
• a fuel plenum defined in the mixing member, the fuel plenum configured to deliver fuel from a fuel source to each set of fuel injectors.

A gas turbine (GT) system, comprising:

• a compressor section;
• a combustion section operatively coupled to the compressor section;
• and
• a turbine section operatively coupled to the combustion section, wherein the combustion section includes at least one combustor including:
• a combustor body including a combustion liner;
• a head end fuel nozzle assembly at a forward end of the combustor body;
• a plurality of axial fuel stage (AFS) injectors directed into the combustor body downstream of the head end fuel nozzle assembly, each AFS injector including:
• a mixing member including:
• a first axially elongated mixing chamber, a second axially elongated mixing chamber, and a third axially elongated mixing chamber between the first axially elongated mixing chamber and the second axially elongated mixing chamber, each axially elongated mixing chamber including an inlet and an outlet, wherein each outlet is configured to be in fluid communication with a combustion chamber of the combustor, and
• a set of fuel injectors defined in opposing side walls of each axially elongated mixing chamber;
• a high pressure (HP) air injection member defining a sets of HP air jets, wherein each set of HP air jets is configured to direct HP air from a HP air source into the inlet of a respective axially elongated mixing chamber where fuel is injected by the set of fuel injectors, and the sets of HP air jets configured to direct the HP air into the inlet of the first and second axially elongated mixing chambers each include a radially inward extending collar having a first side thereof radially farther from the axially elongated mixing chamber than a second, opposite side thereof;
• and
• a fuel plenum defined in the mixing member, the fuel plenum configured to deliver fuel from a fuel source to each set of fuel injectors.