Gas turbine combustor with dynamics mitigation system

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

• a head end section defining a head end plenum;
• a liner extending downstream from the head end section toward an aft frame and defining a combustion chamber therein;
• a bundled tube fuel nozzle assembly disposed in the head end section, the bundled tube fuel nozzle assembly comprising:
• an additively manufactured body, a forward plate facing the head end air plenum, an aft plate facing the combustion chamber, a plurality of premixing tubes extending from the forward plate to the aft plate, and a side wall extending circumferentially around the plurality of premixing tubes and extending axially from the forward plate to the aft plate, such that the forward plate, the aft plate, and the side wall define a fuel plenum;
• wherein the head end air plenum is in fluid communication with the combustion chamber, via the plurality of premixing tubes;
• wherein each premixing tube of the plurality of premixing tubes includes at least one fuel injection hole therethrough in fluid communication with the fuel plenum;
• and wherein the bundled tube fuel nozzle assembly spans an entire diameter of the head end section;
• a first plurality of injectors disposed at a first axial location spaced apart from the head end section to direct a first fuel/air mixture through the liner;
• and
• a dynamics mitigation system comprising one or more quarter-wave tube dampers coupled to the aft plate, extending through the fuel plenum, and terminating in an end upstream of the forward plate, relative to a flow of fluids through the combustor chamber, and wherein at least one of the one or more quarter-wave tube dampers includes a damper mounting body that is integrally connected to the forward plate and the aft plate and an extended damper body that is welded to the damper mounting body, the extended damper body extending into the head end air plenum.

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

• a head end section defining a head end plenum;
• a liner extending downstream from the head end section toward an aft frame and defining a combustion chamber therein;
• a bundled tube fuel nozzle assembly disposed in the head end section, the bundled tube fuel nozzle assembly comprising:
• a forward plate facing the head end air plenum, an aft plate facing the combustion chamber, a plurality of premixing tubes extending from the forward plate to the aft plate, and a side wall extending circumferentially around the plurality of premixing tubes and extending axially from the forward plate to the aft plate, such that the forward plate, the aft plate, and the side wall define a fuel plenum;
• wherein the head end air plenum is in fluid communication with the combustion chamber, via the plurality of premixing tubes;
• wherein each premixing tube of the plurality of premixing tubes includes at least one fuel injection hole therethrough in fluid communication with the fuel plenum;
• and wherein the bundled tube fuel nozzle assembly spans an entire diameter of the head end section;
• a first plurality of injectors disposed at a first axial location spaced apart from the head end section to direct a first fuel/air mixture through the liner;
• and
• a dynamics mitigation system comprising one or more quarter-wave tube dampers coupled to the aft plate, extending through the fuel plenum, and terminating in an end upstream of the forward plate, relative to a flow of fluids through the combustor chamber, wherein the damper mounting body of the at least one of the one or more quarter-wave tube dampers is surrounded by a bellows mounting body that projects from the forward plate into the head end air plenum, wherein the bellows mounting body extends a shorter distance from the forward plate than the damper mounting body, and wherein a bellows assembly is coupled to the bellows mounting body of the at least one of the one or more quarter-wave tube dampers.