ANNULAR PREMIXED PILOT IN FUEL NOZZLE
First Claim
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1. A fuel/air nozzle for a gas turbine engine, the fuel/air nozzle comprising:
- a premixed pilot nozzle having an upstream end axially spaced from a downstream end with respect to an axial center line of a center body of the fuel/air nozzle, wherein the upstream end is connected to a downstream end of the center body; and
the premixed pilot nozzle further defining a plurality of axially elongated, hollow premix conduits annularly arranged around a pilot fuel nozzle portion of the premixed pilot nozzle, each premix conduit having an upstream end defining an entrance opening that communicates fluidly with an interior passage of the center body, each premix conduit having at least one fuel hole in fluid communication with the pilot fuel nozzle portion, each premix conduit including a downstream end defining an exit opening that allows fluid to discharge from the hollow premix conduit;
wherein each downstream end of each premix conduit has a central axis that is not parallel to the central axis of the center body.
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Abstract
A combustor for a gas turbine engine has a head end portion that carries at least one fuel/air nozzle. Each fuel/air nozzle includes a premixed pilot nozzle having premix conduits where each premix conduit has an upstream end defining an opening and having a central axis and downstream end defining an outlet and having a central axis where the central axis of the downstream end is non-parallel with a central axis of a center body of the fuel/air nozzle. The premixed pilot nozzle can include an annular channel disposed radially outwardly from the premix conduits and may include air jets that direct air radially outwardly from the premix conduits.
17 Citations
20 Claims
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1. A fuel/air nozzle for a gas turbine engine, the fuel/air nozzle comprising:
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a premixed pilot nozzle having an upstream end axially spaced from a downstream end with respect to an axial center line of a center body of the fuel/air nozzle, wherein the upstream end is connected to a downstream end of the center body; and the premixed pilot nozzle further defining a plurality of axially elongated, hollow premix conduits annularly arranged around a pilot fuel nozzle portion of the premixed pilot nozzle, each premix conduit having an upstream end defining an entrance opening that communicates fluidly with an interior passage of the center body, each premix conduit having at least one fuel hole in fluid communication with the pilot fuel nozzle portion, each premix conduit including a downstream end defining an exit opening that allows fluid to discharge from the hollow premix conduit; wherein each downstream end of each premix conduit has a central axis that is not parallel to the central axis of the center body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A combustor for a gas turbine engine, the combustor comprising:
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a head end portion; at least one fuel/air nozzle carried by the head portion, each fuel/air nozzle further comprising; a center body defining a central axis of the fuel/air nozzle and an internal passage within the fuel/air nozzle; a fuel supply line extending axially within the center body and in fluid communication with a source of fuel; a premixed pilot nozzle having an upstream end axially spaced from a downstream end with respect to the axial center line of the center body, wherein the upstream end is connected to a downstream end of the center body; and the premixed pilot nozzle further defining a plurality of axially elongated, hollow premix conduits annularly arranged around a pilot fuel nozzle portion of the premixed pilot nozzle, each premix conduit having an upstream end defining an entrance opening in fluid communication with interior passage, each premix conduit having at least one fuel hole in fluid communication with the pilot fuel nozzle portion, each premix conduit including a downstream end defining an exit opening that allows fluid to discharge from the hollow premix conduit; wherein each downstream end of each premix conduit has a central axis that is not parallel to the central axis of the center body. - View Dependent Claims (11, 12, 13)
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14. A method of operating a fuel/air nozzle having a premix pilot nozzle including a plurality of premix conduits annularly arranged around a pilot fuel nozzle portion of the premixed pilot nozzle, the method comprising:
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delivering a flow of pilot fuel to the premix pilot nozzle; delivering a flow of air through the center body to the premix pilot nozzle; mixing the pilot fuel with the flow of air in a plurality of axially elongated, hollow premix conduits wherein each premix conduit defines a central axis at the downstream end thereof that is not parallel to a central axis of the center body and that discharges the fuel/air mixture from the downstream end of the premix pilot nozzle; and expelling the fuel/air mixture from the exit openings of the premix conduits of the premixed pilot nozzle. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification