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A fuel nozzle assembly for use with a turbine engine is described herein. The fuel nozzle assembly includes a plurality of fuel nozzles positioned within an air plenum defined by a casing. Each of the plurality of fuel nozzles is coupled to a combustion liner defining a combustion chamber. Each of t

A fuel nozzle assembly for use with a turbine engine is described herein. The fuel nozzle assembly includes a plurality of fuel nozzles positioned within an air plenum defined by a casing. Each of the plurality of fuel nozzles is coupled to a combustion liner defining a combustion chamber. Each of the plurality of fuel nozzles includes a housing that includes an inner surface that defines a cooling fluid plenum and a fuel plenum therein, and a plurality of mixing tubes extending through the housing. Each of the mixing tubes includes an inner surface defining a flow channel extending between the air plenum and the combustion chamber. At least one mixing tube of the plurality of mixing tubes including at least one cooling fluid aperture for channeling a flow of cooling fluid from the cooling fluid plenum to the flow channel.

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1. A fuel nozzle assembly for use with a turbine engine, said fuel nozzle assembly comprising: a plurality of fuel nozzles positioned within an air plenum defined by a casing, each of said plurality of fuel nozzles coupled to a combustion liner defining a combustion chamber, each of said plurality o

1. A fuel nozzle assembly for use with a turbine engine, said fuel nozzle assembly comprising: a plurality of fuel nozzles positioned within an air plenum defined by a casing, each of said plurality of fuel nozzles coupled to a combustion liner defining a combustion chamber, each of said plurality of fuel nozzles comprises: a housing comprising a sidewall extending between a forward endwall and an opposite aft endwall, said sidewall comprising an inner surface that defines a cooling fluid plenum and a fuel plenum therein, said sidewall comprising at least one opening extending through said inner surface of said sidewall; anda plurality of mixing tubes extending through said housing, wherein each of said mixing tubes comprises an inner surface defining a flow channel extending between the air plenum and the combustion chamber, at least one mixing tube of said plurality of mixing tubes comprises at least one cooling fluid aperture for channeling a flow of cooling fluid from said cooling fluid plenum to said flow channel; andat least one cooling conduit coupled to said sidewall such that said at least one sidewall opening couples said cooling conduit in flow communication with said cooling fluid plenum for channeling a flow of cooling fluid to said cooling fluid plenum. 2. A fuel nozzle assembly in accordance with claim 1, wherein said at least one mixing tube comprises at least one fuel aperture for channeling a flow of fuel from said fuel plenum to said flow channel. 3. A fuel nozzle assembly in accordance with claim 1, wherein said housing further comprises: an interior wall extending inwardly from said sidewall inner surface such that said fuel plenum is defined between said interior wall and said forward endwall, and such that said cooling fluid plenum is defined between said interior wall and said aft endwall. 4. A fuel nozzle assembly in accordance with claim 3, wherein said interior wall comprises an opening extending through said interior wall, said cooling conduit coupled to said interior wall such that said interior wall opening couples said cooling conduit in flow communication with said cooling fluid plenum. 5. A fuel nozzle assembly in accordance with claim 1, further comprising: an end plate coupled to an outer surface of said sidewall; andan impingement plate coupled to said sidewall outer surface and spaced outwardly from said end plate such that a first chamber is defined between said endplate and said impingement plate, said cooling conduit coupled to said impingement plate to channel a flow of cooling fluid to said first chamber and to said cooling fluid plenum. 6. A fuel nozzle assembly in accordance with claim 5, further comprising a separation wall coupled between said cooling conduit and said end plate to isolate said cooling conduit from said first chamber. 7. A fuel nozzle assembly in accordance with claim 6, wherein said separation wall comprises at least one opening extending through said separation wall to couple said cooling conduit in flow communication with said plurality of fuel nozzles. 8. A fuel nozzle assembly in accordance with claim 6, further comprising a divider wall coupled between said cooling conduit and said housing sidewall such that a second chamber is defined between said sidewall and said divider wall, said divider wall comprising at least one opening extending through said divider wall to couple said cooling conduit in flow communication with said cooling fluid plenum through said chamber. 9. A fuel nozzle assembly in accordance with claim 3, further comprising a plurality of openings extending through said aft endwall to couple said cooling fluid plenum to said combustion chamber, said plurality of openings oriented circumferentially about said at least one mixing tube. 10. A fuel nozzle assembly in accordance with claim 9, wherein said at least one mixing tube comprising a tip end that extends outwardly from said aft endwall towards said combustion chamber. 11. A fuel nozzle assembly in accordance with claim 10, wherein each of said plurality of openings is oriented at a first oblique angle with respect to said aft endwall, said mixing tube tip end comprises a tip surface that is oriented at a second oblique angle that is approximately equal to said first oblique angle. 12. A fuel nozzle assembly in accordance with claim 1, wherein said at least one mixing tube comprises an outer surface and at least one slot defined along said outer surface to couple said cooling fluid plenum in flow communication with said combustion chamber. 13. A fuel nozzle assembly in accordance with claim 1, wherein said at least one mixing tube comprises a tip end extending between an inner surface and an outer surface of said at least one mixing tube, and at least one channel extending from said outer surface towards said tip end to channel cooling fluid from said cooling fluid plenum towards the combustion chamber. 14. A combustor assembly for use with a turbine engine, said combustor assembly comprising: a casing comprising an air plenum;a combustor liner positioned within said casing and defining a combustion chamber therein; anda fuel nozzle assembly comprising a plurality of fuel nozzles, each of said plurality of fuel nozzles coupled to said combustion liner, each of said plurality of fuel nozzles comprises: a housing comprising a forward endwall, and aft endwall, and a sidewall extending between said forward endwall and said aft endwall, said sidewall comprising inner surface that defines a cooling fluid plenum and a fuel plenum therein, wherein said housing sidewall comprises at least one opening extending through said sidewall inner surface;a plurality of mixing tubes coupled in flow communication with said air plenum and extending through said housing, wherein each of said mixing tubes comprises an inner surface defining a flow channel extending between the air plenum and the combustion chamber, at least one mixing tube of said plurality of mixing tubes comprises at least one cooling fluid aperture for channeling a flow of cooling fluid from said cooling fluid plenum to said flow channel; anda cooling conduit coupled to said sidewall such that said at least one sidewall opening couples said cooling conduit in flow communication with said cooling fluid plenum for channeling a flow of cooling fluid to said cooling fluid plenum. 15. A combustor assembly in accordance with claim 14 further comprising: an end plate coupled to an outer surface of said sidewall; andan impingement plate coupled to said sidewall outer surface and spaced outwardly from said end plate such that a first chamber is defined between said endplate and said impingement plate, said cooling conduit coupled to said impingement plate to channel a flow of cooling fluid to said first chamber and to said cooling fluid plenum. 16. A combustor assembly in accordance with claim 15, further comprising a separation wall coupled between said cooling conduit and said end plate to isolate said cooling conduit from said first chamber. 17. A combustor assembly in accordance with claim 16, wherein said separation wall comprises at least one opening extending through said separation wall to couple said cooling conduit in flow communication with said plurality of fuel nozzles. 18. A combustor assembly in accordance with claim 16, further comprising a divider wall coupled between said cooling conduit and said housing sidewall such that a second chamber is defined between said sidewall and said divider wall, said divider wall comprising at least one opening extending through said divider wall to couple said cooling conduit in flow communication with said cooling fluid plenum through said chamber. 19. A combustor assembly in accordance with claim 14, further comprising a plurality of openings extending through said aft endwall to couple said cooling fluid plenum to said combustion chamber, said plurality of openings oriented circumferentially about said at least one mixing tube. 20. A combustor assembly in accordance with claim 19, wherein said at least one mixing tube comprising a tip end that extends outwardly from said aft endwall towards said combustion chamber, wherein each of said plurality of openings is oriented at a first oblique angle with respect to said aft endwall, said mixing tube tip end comprises a tip surface that is oriented at a second oblique angle that is approximately equal to said first oblique angle. 21. A combustor assembly in accordance with claim 14, wherein said at least one mixing tube comprises an outer surface and at least one slot defined along said outer surface to couple said cooling fluid plenum in flow communication with said combustion chamber. 22. A combustor assembly in accordance with claim 14, wherein said at least one mixing tube comprises a tip end extending between an inner surface and an outer surface of said at least one mixing tube, and at least one channel extending from said outer surface towards said tip end to channel cooling fluid from said cooling fluid plenum towards the combustion chamber. 23. A method of assembling a fuel nozzle assembly for use with a turbine engine, said method comprising: coupling a sidewall between a forward endwall and an opposite aft endwall to form a housing having an inner surface that defines a cavity therein, wherein the housing sidewall comprises at least one opening extending through the sidewall inner surface;coupling an interior wall to the housing inner surface such that a fuel plenum is defined between the interior wall and the forward endwall, and such that a cooling fluid plenum is defined between the interior wall and the aft endwall;coupling a plurality of mixing tubes to the housing, such that each mixing tube of the plurality of mixing tubes extends through the housing, each of the plurality of mixing tubes including an inner surface that defines a flow channel;defining at least one cooling fluid aperture through the at least one mixing tube to couple the cooling fluid plenum in flow communication with the mixing tube flow channel; andcoupling a cooling conduit to the housing sidewall such that the at least one sidewall opening couples the cooling conduit in flow communication with the cooling fluid plenum. 24. A method in accordance with claim 23, further comprising defining a plurality of openings through the aft endwall to couple the cooling fluid plenum in flow communication with the combustion chamber, wherein the plurality of openings are oriented circumferentially about the at least one mixing tube. 25. A method in accordance with claim 23, further comprising defining at least one slot along an outer surface of the at least one mixing tube to couple the cooling fluid plenum in flow communication with the combustion chamber. 26. A method in accordance with claim 23, wherein at least one mixing tube of the plurality of mixing tubes includes a tip end extending between the inner surface and an outer surface of said at least one mixing tube, said method further comprises defining at least one channel extending from the mixing tube outer surface towards the tip end to channel cooling fluid from the cooling fluid plenum towards the combustion chamber. 27. A method in accordance with claim 23, further comprising: defining at least one opening extending through the housing sidewall; andcoupling the cooling conduit to the sidewall such that the at least one sidewall opening couples the cooling conduit in flow communication with the cooling fluid plenum.