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A system includes a combustor cap assembly for a multi-tube fuel nozzle. The combustor cap assembly includes a support structure defining an interior volume configured to receive an air flow. The combustor cap assembly also includes multiple mixing tubes disposed within the interior volume, wherein

A system includes a combustor cap assembly for a multi-tube fuel nozzle. The combustor cap assembly includes a support structure defining an interior volume configured to receive an air flow. The combustor cap assembly also includes multiple mixing tubes disposed within the interior volume, wherein each mixing tube is configured to mix air and fuel to form an air-fuel mixture. The combustor cap assembly further includes a combustor cap removably coupled to the support structure. The combustor cap includes multiple nozzles integrated within the combustor cap. Each nozzle of the multiple nozzles is coupled to a respective mixing tube of the multiple mixing tubes. The combustor cap is configured to internally cool itself via one or more cooling features integrated within the combustor cap.

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1. A system, comprising: a combustor cap assembly for a multi-tube fuel nozzle, comprising: a support structure defining an interior volume configured to receive an air flow;a plurality of mixing tubes disposed within the interior volume, wherein each mixing tube comprises an upstream end and a down

1. A system, comprising: a combustor cap assembly for a multi-tube fuel nozzle, comprising: a support structure defining an interior volume configured to receive an air flow;a plurality of mixing tubes disposed within the interior volume, wherein each mixing tube comprises an upstream end and a downstream end, and wherein each mixing tube is configured to receive fuel through the upstream end, to mix air and the fuel to form an air-fuel mixture, and to discharge the air-fuel mixture through the downstream end into a combustion chamber;a combustor cap removably coupled to the support structure downstream of the plurality of mixing tubes, wherein the combustor cap interfaces with the combustion chamber and comprises a plurality of nozzles integrated within the combustor cap, each nozzle of the plurality of nozzles directly contacts a respective downstream end of a respective mixing tube of the plurality of mixing tubes, and wherein the combustor cap is configured to internally cool itself via the plurality of nozzles and one or more cooling features integrated within the combustor cap. 2. The system of claim 1, wherein each mixing tube of the plurality of mixing tubes is configured to be thermally coupled to the combustor cap via a respective nozzle of the plurality of nozzles. 3. The system of claim 1, wherein each nozzle of the plurality of nozzles comprises structures that extend radially inward relative to a longitudinal axis of the combustor cap assembly from an inner surface of the respective nozzle into a flow path of the air-fuel mixture through the respective nozzle. 4. The system of claim 1, wherein the one or more cooling features comprise cooling cavities disposed internally within the combustor cap adjacent one or more of the plurality of nozzles. 5. The system of claim 4, wherein the combustor cap comprises a first surface facing the plurality of mixing tubes and a second surface disposed opposite the first surface, one or more of the cooling cavities include an inlet disposed on the first surface and configured to receive impingement air flow into the combustor cap, and one or more of the cooling cavities include an outlet disposed on the second surface and configured to enable the exit of the impingement air flow from the combustor cap. 6. The system of claim 5, wherein the outlets are disposed about a periphery of the second surface of the combustor cap. 7. The system of claim 5, wherein the combustor cap comprises a plurality of sectors, each sector having the first and second surfaces, and the outlets are disposed about a periphery of one or more of the sectors. 8. The system of claim 5, wherein the combustor cap comprises cooling channels disposed internally within the combustor cap that fluidly couple at least a portion of the cooling cavities to each other. 9. The system of claim 8, wherein the combustor cap comprises structures that extend into the cooling channels from an internal surface of the combustor cap into the impingement air flow. 10. The system of claim 5, wherein each respective outlet of the cooling cavities is configured to enable internal, zero-cross flow cooling of the combustor cap by directing exit of the impingement air flow from the combustor cap in a direction that does not interfere with or cross-flow with other impingement air flows downstream of the combustor cap. 11. The system of claim 1, wherein the combustor cap comprises a first surface facing the plurality of mixing tubes, a second surface disposed opposite the first surface, and a thermal barrier coating disposed on the second surface. 12. The system of claim 1, wherein the combustor cap comprises a first surface facing the plurality of mixing tubes, a second surface disposed opposite the first surface, and a catalyst configured to reduce exhaust products disposed on the second surface. 13. The system of claim 1, comprising a gas turbine engine, a combustor, or the multi-tube fuel nozzle having the combustor cap assembly. 14. A system, comprising: a combustor cap configured to interface with a combustion chamber and to be coupled to a plurality of mixing tubes of a multi-tube fuel nozzle, wherein each mixing tube of the plurality of mixing tubes comprises an upstream end and a downstream end and is configured to receive fuel through the upstream end, to mix air and the fuel to form an air-fuel mixture, and to discharge the air-fuel mixture through the downstream end into the combustion chamber, the combustor cap comprises a plurality of nozzles integrated within the combustor cap, each nozzle of the plurality of nozzles is configured to directly contact a respective downstream end of a respective mixing tube of the plurality of mixing tubes, and the combustor cap is configured to internally cool itself via the plurality of nozzles and one or more cooling features integrated within the combustor cap. 15. The system of claim 14, wherein each nozzle of the plurality of nozzles comprises structures that extend radially inward relative to longitudinal axes of the plurality of mixing tubes from an inner surface of the respective nozzle of the plurality of nozzles into a flow path of the air-fuel mixture through the respective nozzle. 16. The system of claim 14, wherein the combustor cap comprises a first surface configured to face the plurality of mixing tubes and a second surface disposed opposite the first surface, the one or more cooling features comprise cooling cavities disposed internally within the combustor cap adjacent one or more of the plurality of nozzles, one or more of the cooling cavities include an inlet disposed on the first surface and configured to receive impingement air flow into the combustor cap, and one or more of the cooling cavities include an outlet disposed on the second surface and configured to enable the exit of the impingement air flow from the combustor cap. 17. The system of claim 16, wherein the combustor cap comprises cooling channels disposed internally within the combustor cap that fluidly couple at least a portion of the cooling cavities to each other. 18. A system, comprising: a combustor cap configured to interface with a combustion chamber and to be coupled to a plurality of mixing tubes of a multi-tube fuel nozzle, wherein each mixing tube of the plurality of mixing tubes comprises an upstream end and a downstream end and is configured to receive fuel through the upstream end, to mix air and the fuel to form an air-fuel mixture, and to discharge the air-fuel mixture through the downstream end into the combustion chamber, wherein the combustor cap comprises a first surface configured to directly face the downstream ends of the plurality of mixing tubes, a second surface disposed opposite the first surface that directly interfaces with the combustion chamber, and cooling cavities integrated within the combustor cap and configured to internally cool the combustor cap, wherein one or more of the cooling cavities include an inlet disposed on the first surface and configured to receive impingement air flow into the combustor cap, and one or more of the cooling cavities include an outlet disposed on the second surface and configured to enable the exit of the impingement air flow from the combustor cap. 19. The system of claim 18, wherein the combustor cap comprises a plurality of nozzles integrated within the combustor cap that are configured to internally cool the combustor cap, each nozzle of the plurality of nozzles is configured directly contact a respective downstream end of a respective mixing tube of the plurality of mixing tubes, and one or more of the cooling cavities are disposed internally within the combustor cap adjacent one or more of the plurality of nozzles.