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A combustor includes an end cap that extends radially across a portion of the combustor and includes an upstream surface axially separated from a downstream surface. A combustion chamber is downstream of the end cap. Premixer tubes extend from a premixer tube inlet proximate to the upstream surface

A combustor includes an end cap that extends radially across a portion of the combustor and includes an upstream surface axially separated from a downstream surface. A combustion chamber is downstream of the end cap. Premixer tubes extend from a premixer tube inlet proximate to the upstream surface through the downstream surface to provide fluid communication through the end cap and include means for conditioning flow through the plurality of premixer tubes. A method for conditioning flow through a combustor includes flowing a working fluid through a first and second set of premixer tubes that extend axially through an end cap, wherein the second set of premixer tubes includes means for conditioning flow through the second set of premixer tubes, and flowing a fuel through the first or second set of premixer tubes.

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1. A combustor, comprising: a. an end cap that extends radially across at least a portion of the combustor, wherein the end cap comprises an upstream surface axially separated from a downstream surface;b. a combustion chamber downstream of the end cap;c. a plurality of premixer tubes that extend fro

1. A combustor, comprising: a. an end cap that extends radially across at least a portion of the combustor, wherein the end cap comprises an upstream surface axially separated from a downstream surface;b. a combustion chamber downstream of the end cap;c. a plurality of premixer tubes that extend from a premixer tube inlet proximate to the upstream surface through the downstream surface of the end cap, wherein each premixer tube provides fluid communication through the end cap to the combustion chamber;d. means for conditioning flow through the plurality of premixer tubes adjacent to the premixer tube inlet. 2. The combustor as in claim 1, wherein the means for conditioning flow through the plurality of premixer tubes comprises one or more slots in one or more premixer tube inlets. 3. The combustor as in claim 2, wherein the slots have at least one of a rounded, pointed, or flat shape. 4. The combustor as in claim 1, wherein the means for conditioning flow through the plurality of premixer tubes comprises one or more apertures adjacent to one or more premixer tube inlets. 5. The combustor as in claim 4, wherein the apertures have at least one of an arcuate or polygonal shape. 6. The combustor as in claim 1, further comprising a shroud that circumferentially surrounds at least a portion of the end cap, wherein the shroud at least partially defines a fuel plenum between the upstream surface and the downstream surface. 7. The combustor as in claim 1, further comprising a fuel conduit that extends through the upstream surface of the end cap. 8. The combustor as in claim 1, further comprising a fuel port that extends through one or more premixer tubes downstream from the means for conditioning flow through the plurality of premixer tubes, wherein each fuel port provides fluid communication through the one or more premixer tubes. 9. The combustor as in claim 1, further comprising a fuel nozzle extending through the end cap, wherein the fuel nozzle provides fluid communication through the end cap to the combustion chamber. 10. A combustor, comprising: a. an end cap that extends radially across at least a portion of the combustor, wherein the end cap comprises an upstream surface axially separated from a downstream surface;b. a shroud that circumferentially surrounds at least a portion of the end cap, wherein the shroud at least partially defines a fuel plenum between the upstream surface and the downstream surface;c. a plurality of premixer tubes that extend through the upstream and downstream surfaces of the end cap, wherein each premixer tube includes a premixer tube inlet; andd. means for conditioning flow through the plurality of premixer tubes adjacent to the premixer tube inlet. 11. The combustor as in claim 10, wherein the means for conditioning flow through the plurality of premixer tubes comprises one or more slots in one or more premixer tube inlets. 12. The combustor as in claim 11, wherein the slots have at least one of a rounded, pointed, or flat shape. 13. The combustor as in claim 10, wherein the means for conditioning flow through the plurality of premixer tubes comprises one or more apertures adjacent to one or more premixer tube inlets. 14. The combustor as in claim 13, wherein the apertures have at least one of an arcuate or polygonal shape. 15. The combustor as in claim 10, further comprising a fuel port that extends through one or more premixer tubes downstream from the means for conditioning flow through the plurality of premixer tubes, wherein each fuel port provides fluid communication through the one or more premixer tubes. 16. The combustor as in claim 10, further comprising a fuel nozzle extending through the upstream surface and the downstream surface of the end cap, wherein the fuel nozzle provides fluid communication through the end cap. 17. A method for conditioning flow through a combustor, comprising: a. flowing a working fluid through a first set of premixer tubes that extend axially through an end cap that extends radially across at least a portion of the combustor;b. flowing the working fluid through a second set of premixer tubes that extend axially through the end cap, wherein the second set of premixer tubes includes a premixer tube inlet and means for conditioning flow through the second set of premixer tubes adjacent to the premixer tube inlet; andc. flowing a fuel through at least one of the first or second set of premixer tubes. 18. The method as in claim 17, further comprising flowing the fuel through a fuel nozzle that extends axially through the end cap. 19. The method as in claim 17, further comprising separating the premixer tubes into groups. 20. The method as in claim 19, further comprising adjusting the fuel flow rate through the groups of premixer tubes.