A premix fuel nozzle assembly includes a center body, a pilot premix fuel nozzle assembly that extends axially through the center body and that includes a premix tip having a plurality of premix tubes that each defines a premix passage and a fuel port. The premix passage of each premix tube is in fl
A premix fuel nozzle assembly includes a center body, a pilot premix fuel nozzle assembly that extends axially through the center body and that includes a premix tip having a plurality of premix tubes that each defines a premix passage and a fuel port. The premix passage of each premix tube is in fluid communication with the pilot air passage. The premix fuel nozzle assembly further includes a purge air cartridge assembly that extends axially within the pilot air passage. The purge air cartridge assembly includes a feed tube portion and a tip portion that define a purge air passage within the pilot air passage. The tip portion comprises an aft wall that extends at least partially through an opening defined by the premix tip. The aft wall includes a single axially extending orifice that is in fluid communication with the purge air passage.
대표청구항▼
1. A premix fuel nozzle assembly, comprising; a center body at least partially defined by a sleeve having an inner surface;a burner tube formed radially outward of the center body and extending axially aft of the center body and an annular mixing chamber defined between the center body and the burne
1. A premix fuel nozzle assembly, comprising; a center body at least partially defined by a sleeve having an inner surface;a burner tube formed radially outward of the center body and extending axially aft of the center body and an annular mixing chamber defined between the center body and the burner tube;a pilot premix fuel nozzle assembly that extends axially through the center body within the sleeve and defines a pilot air passage within the center body, the pilot premix fuel nozzle assembly including a premix tip having a plurality of premix tubes, each premix tube defining a premix passage and a fuel port, wherein the premix passage is in fluid communication with the pilot air passage;a pilot fuel flow path defined radially between the inner surface of the sleeve of the center body and the plurality of premix passages; and a purge air cartridge assembly that extends axially within the pilot air passage, the purge air cartridge assembly having a feed tube portion and a tip portion that define a purge air passage within the pilot air passage, the tip portion comprising an aft wall that extends at least partially through an opening defined by the premix tip, the aft wall defining a single axially extending orifice, wherein the orifice is coaxially aligned with an axial centerline of at least one of the purge air cartridge assembly and the pilot premix-fuel nozzle assembly; wherein the orifice is in fluid communication with the purge air passage; and wherein the aft wall further comprises a gap for creating a recirculation zone. 2. The premix fuel nozzle assembly as in claim 1, wherein the purge air cartridge assembly further comprises an impingement plate disposed within the pilot air passage upstream from a forward side of the aft wall. 3. The premix fuel nozzle assembly as in claim 2, wherein the impingement plate includes a plurality of impingement holes oriented to direct a flow of a purge medium against the forward side of the aft wall. 4. The premix fuel nozzle assembly as in claim 2, wherein the impingement plate at least partially defines an impingement plenum between the impingement plate and the aft wall. 5. The premix fuel nozzle assembly as in claim 1, wherein the aft wall includes a slanted side wall and a plurality of purge passages that extend radially through the slanted side wall, wherein the purge passages are in fluid communication with the purge air passage. 6. The premix fuel nozzle assembly as in claim 5, wherein the plurality of purge passages are oriented towards the gap. 7. The premix fuel nozzle assembly as in claim 1, wherein the pilot premix fuel nozzle assembly includes a stem, a coupling collar, a bellows and a flow expansion collar connected in sequence upstream from the premix tip. 8. The premix fuel nozzle assembly as in claim 7, further comprising a liner that circumferentially surrounds the bellows, wherein the bellows and the liner at least partially define a plenum therebetween. 9. A combustor comprising: an end cover;a plurality of premix fuel nozzle assemblies annularly arranged about a center fuel nozzle, each premix fuel nozzle assembly of the plurality of premix fuel nozzle assemblies and the center fuel nozzle being fixedly connected to the end cover, each of the premix fuel nozzle assemblies being a dual fuel type premix fuel nozzle assembly, wherein each premix fuel nozzle assembly comprises;a center body at least partially defined by a sleeve having an inner surface;a burner tube formed radially outward of the center body and extending axially aft of the center body and an annular mixing chamber defined between the center body and the burner tube;a pilot premix fuel nozzle assembly that extends axially through the center body within the sleeve and defines a pilot air passage within the center body, the pilot premix fuel nozzle assembly including a premix tip having a plurality of premix tubes, each premix tube having an inlet end, and outlet end and a premix passage defined therebetween, each premix tube having a fuel port, wherein the inlet end of the premix tube is in fluid communication with the pilot air passage and a fuel passage radially outward of the pilot air passage;a pilot fuel flow path defined radially between path defined radially between the inner surface of the sleeve of the center body and the plurality of premix passages; a fuel plenum at least partially defined between the inner surface of the sleeve of the center body and an outer surface of the premix tip, wherein the fuel ports provide for fluid communication between the fuel plenum and the premix passages; and a purge air cartridge assembly that extends axially within the pilot air passage, the purge air cartridge assembly having a feed tube portion and a tip portion that define a purge air passage within the pilot air passage, the tip portion comprising an aft wall that extends at least partially through an opening defined by the premix tip, the aft wall defining a single axially extending orifice, wherein the orifice is coaxially aligned with an axial centerline of at least one of the purge air cartridge assembly and the pilot premix fuel nozzle assembly, wherein the orifice is in fluid communication with the purge air passage; and wherein the aft wall further comprises a gap for creating a recirculation zone. 10. The combustor as in claim 9, wherein the purge air cartridge assembly further comprises an impingement plate disposed within the pilot air passage upstream from a forward side of the aft wall. 11. The combustor as in claim 10, wherein the impingement plate of the purge air cartridge assembly includes a plurality of impingement holes oriented to direct a flow of a purge medium against the forward side of the aft wall and wherein the impingement plate at least partially defines an impingement plenum between the impingement plate and the aft wall. 12. The combustor as in claim 11, wherein the aft wall of the purge air cartridge assembly includes a slanted side wall and a plurality of purge passages that extend radially through the slanted side wall, wherein the purge passages are in fluid communication with the purge air passage. 13. The combustor as in claim 12, wherein the plurality of purge passages are oriented towards the gap. 14. The combustor as in claim 9, wherein the pilot premix fuel nozzle assembly includes a stem, a coupling collar, a bellows and a flow expansion collar connected in sequence upstream from the premix tip. 15. The combustor as in claim 14, wherein the pilot premix fuel nozzle assembly further comprises a liner that circumferentially surrounds the bellows, wherein the bellows and the liner at least partially define a plenum therebetween. 16. The combustor as in claim 9, wherein the plurality of premix tubes of the pilot premix fuel nozzle assembly is annularly arranged around the outer surface of the premix tip within the fuel plenum. 17. The combustor as in claim 9, wherein the pilot premix fuel nozzle assembly includes one or more radial offset features which extend radially outwardly from one or more outer surfaces of the pilot premix fuel nozzle assembly within the premix fuel flow path. 18. The combustor as in claim 9, wherein the outlet ends of the premix tubes of the plurality of premix tubes is annularly arranged about a fuel distribution disk portion of the premix tip.
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