Gas turbine engine fuel nozzle having a secondary fuel passage through a swirler
An engine can utilize a combustor to combust fuel to drive the engine. A fuel nozzle assembly can supply fuel to the combustor for combustion or ignition of the fuel. The fuel nozzle assembly can include a swirler and a fuel nozzle to supply a mixture of fuel and air for combustion, which can supply a primary fuel supply and a secondary fuel supply. Increasing efficiency and reducing emission require the use of alternative fuels, which combust at higher temperatures or burn at faster burn speeds than traditional fuels, requiring improved fuel introduction without the occurrence of flame holding or flashback.
1 . A turbine engine comprising:
a compressor section, combustor section, and turbine section in serial flow arrangement, defining a rotational axis and extending from forward to aft, with the combustor section including a fuel nozzle assembly comprising:
a fuel nozzle including an outer wall defining a fuel passage and a longitudinal axis;
a swirler circumscribing the fuel nozzle and defining a first swirler air passage and a second swirler air passage;
a vane extending across the first swirler air passage; and
a secondary fuel passage passing through the vane and exhausting into the second swirler air passage.
2 . The turbine engine of claim 1 , wherein the secondary fuel passage fluidly couples to the fuel passage.
3 . The turbine engine of claim 1 , wherein the secondary fuel passage passes through the outer wall of the fuel nozzle.
4 . The turbine engine of claim 1 , wherein the secondary fuel passage splits to exhaust at a first outlet and a second outlet.
5 . The turbine engine of claim 1 , wherein the swirler includes an axial swirler, the first swirler air passage is an axial swirler air passage, and the vane is an axial swirler vane.
6 . The turbine engine of claim 5 , wherein the swirler further includes a radial swirler arranged exterior of the axial swirler, the radial swirler including the second swirler air passage and a radial swirler vane extending across the second swirler air passage.
7 . The turbine engine of claim 6 , wherein the secondary fuel passage passes through the axial swirler vane and exhausts to the radial swirler air passage.
8 . The turbine engine of claim 6 , wherein the radial swirler includes a forward wall and an aft wall, and wherein the radial swirler vane extends between the forward wall and the aft wall.
9 . The turbine engine of claim 8 , wherein the secondary fuel passage extends through the forward wall, through the axial swirler vane, and through the aft wall to exhaust to the second swirler air passage from an outlet at the aft wall.
10 . The turbine engine of claim 9 , wherein the secondary fuel passage is fluidly isolated from the fuel passage of the fuel nozzle within the fuel nozzle assembly.
11 . The turbine engine of claim 9 , wherein the fuel nozzle terminates at a nozzle tip, and wherein the outlet for the secondary fuel passage is positioned forward of the nozzle tip.
12 . The turbine engine of claim 1 , further comprising a nozzle cap positioned within the fuel passage.
13 . The turbine engine of claim 12 , wherein the fuel nozzle terminates at a nozzle tip, and wherein the nozzle cap is spaced from the nozzle tip.
14 . The turbine engine of claim 1 , wherein the vane extending across the first swirler air passage includes an axial swirler vane, and the second swirler air passage includes a radial swirler vane.
15 . A fuel nozzle assembly for a turbine engine, the fuel nozzle assembly comprising:
a fuel nozzle including an outer wall defining a fuel passage and a longitudinal axis;
a swirler circumscribing the fuel nozzle and defining a first swirler air passage and a second swirler air passage;
a vane extending across the first swirler air passage; and
a secondary fuel passage passing through the vane and exhausting into the second swirler air passage.
16 . The fuel nozzle assembly of claim 15 , wherein the secondary fuel passage passes through the outer wall of the fuel nozzle.
17 . The fuel nozzle assembly of claim 15 , wherein the swirler is an axial swirler, the first swirler air passage is an axial swirler air passage, and the vane is an axial swirler vane.
18 . The fuel nozzle assembly of claim 15 , wherein the swirler is a radial swirler and includes the second swirler air passage, a forward wall and an aft wall, and wherein the vane extends between the forward wall and the aft wall.
19 . The fuel nozzle assembly of claim 15 , wherein a vane extending across the first swirler air passage includes an axial swirler vane, and the second swirler air passage includes a radial swirler vane.
20 . A fuel nozzle assembly for a turbine engine, the fuel nozzle assembly comprising:
a fuel nozzle including an outer wall defining a fuel passage and a longitudinal axis;
an axial swirler circumscribing the fuel nozzle and defining an axial swirler air passage;
an axial swirler vane extending across the swirler air passage;
a secondary fuel passage passing through the axial swirler vane; and
a radial swirler arranged exterior of the axial swirler, the radial swirler including a radial swirler air passage and a radial swirler vane extending across the radial swirler air passage.