Flexible swirlers
A swirler includes a swirler body and a plurality of axial swirl vanes extending radially outward from the swirler body. At least one of the swirler body or vanes includes a spring channel defined therethrough. A fuel injector for a gas turbine engine can include an inner air swirler and/or outer air swirler as described above.
1. A swirler comprising:
a swirler body; and
a plurality of axial swirl vanes extending radially outward from the swirler body, wherein at least one of the vanes includes a spring channel defined circumferentially through the thickness thereof, wherein the spring channel is located in the at least one vane extending radially outward of a base of the vane where the swirl vane connects to the swirler body, and extending radially inward of a radially outward tip of the swirl vane, wherein the spring channel is at least one of:
the spring channel extending from an upstream portion of the vane to a channel opening at a trailing edge of the vane; and
the spring channel extending from a downstream portion of the vane to a channel opening at a leading edge of the vane.
2. A swirler as recited in claim 1 , wherein each of the vanes includes the spring channel defined therethrough, extending from an upstream portion of the vane to a channel opening at a trailing edge of the vane.
3. A swirler as recited in claim 1 , wherein each of the vanes includes the spring channel defined therethrough, extending from a downstream portion of the vane to a channel opening at a leading edge of the vane.
4. A swirler as recited in claim 1 , wherein the spring channel is a first spring channel, wherein each of the vanes includes a sigmoid spring including:
the first spring channel defined therethrough, extending from an upstream portion of the vane to a channel opening at a trailing edge of the vane; and
a second spring channel defined therethrough radially spaced apart from the first spring channel, extending from a downstream portion of the vane to a channel opening at a leading edge of the vane.
5. A swirler as recited in claim 1 , wherein one end of the spring channel terminates at a stress reducer bore.
6. A swirler as recited in claim 1 , wherein the swirler body includes a barrel of an outer air swirler, wherein a plurality of spring channels are defined through the barrel.
7. A swirler as recited in claim 6 , wherein the spring channels defined through the barrel extend helically about the barrel.
8. A fuel injector for a gas turbine engine comprising:
a) an injector body having a feed arm with a nozzle body connected thereto;
b) a fuel conduit fluidly connecting a fuel inlet portion of the feed arm to a fuel circuit in the nozzle body to form a fuel path through the injector body;
c) an outer air swirler operatively connected to the nozzle body outboard of the fuel circuit, the outer air swirler including a barrel with a plurality of swirl vanes extending radially outward from the barrel; and
d) an inner air swirler operatively connected to the nozzle body inboard of the fuel circuit, the inner air swirler including an inner aft swirler bullet with a plurality of swirl vanes extending radially outward from the bullet, wherein at least one of the vanes of the outer air swirler, or the swirl vanes of the inner air swirler includes a spring channel defined circumferentially through the thickness thereof, wherein the spring channel is located in the at least one vane extending radially outward of a base of the vane, and extending radially inward of a radially outward tip of the swirl vane, wherein the spring channel is at least one of:
the spring channel extending from an upstream portion of the vane to a channel opening at a trailing edge of the vane; or
the spring channel extending from a downstream portion of the vane to a channel opening at a leading edge of the vane.
9. A fuel injector as recited in claim 8 , wherein one end of the spring channel terminates at a stress reducer bore.
10. A fuel injector as recited in claim 8 , wherein the spring channel is a first spring channel, wherein each of the vanes of at least one of the inner air swirler or outer air swirler includes a sigmoid spring including:
the first spring channel defined therethrough, extending from an upstream portion of the vane to a channel opening at a trailing edge of the vane; and
a second spring channel defined therethrough radially spaced apart from the first spring channel, extending from a downstream portion of the vane to a channel opening at a leading edge of the vane.