Fuel nozzle manifold systems for turbomachines

1. An internal fuel manifold for a turbomachine, comprising:

an outer ring defining one or more fuel supply channels configured to allow fuel flow around at least a portion of a circumference of the outer ring;

a plurality of branches extending radially inward from the outer ring, wherein the branches include a high aspect ratio shape, wherein the plurality of branches include one or more branch fuel channels in fluid communication with at least one of the one or more fuel supply channels;

one or more injector connectors extending axially aft from each branch, each injector connector in fluid communication with a branch fuel channel and configured to connect to a fuel injector; and

an inner ring extending from the plurality of branches, wherein the inner ring and the outer ring are configured to receive a fuel injector and combustor assembly therebetween and to allow retaining of the fuel injector and combustor assembly to the internal fuel manifold.

2. The manifold of claim 1 , wherein one or more branch fuel channels includes a plurality of branch fuel channels.

3. The manifold of claim 2 , wherein the at least one or more injector connectors include a plurality of injector connectors.

4. The manifold of claim 3 , wherein each branch fuel channel is connected to a respective injector connector.

5. The manifold of claim 4 , wherein the one or more fuel supply channels include a plurality of fuel supply channels.

6. The manifold of claim 5 , wherein the plurality of fuel supply channels include at least as many fuel supply channels as there are branch fuel channels in each branch such that each injector connector can be supplied with fuel independent of other injector connectors on the same branch.

7. The manifold of claim 3 , wherein the plurality of injector connectors are disposed radially along the branch to form circumferential rows with injector connectors of other branches.

8. The manifold of claim 3 , wherein each of the plurality of injector connectors extend from the branch in a different direction.

9. The manifold of claim 1 , wherein the inner ring is segmented to accommodate thermal expansion such that the inner ring is comprised of detached segments that can move relative to each other.

10. The manifold of claim 1 , wherein the branch includes a pull handle shape such that the branch extends axially forward from the outer ring and the inner ring.

11. The manifold of claim 1 , wherein the outer ring and the inner ring define a bayonet flange for connecting the fuel injector assembly using one or more retainer rings.

12. A fuel injector system, comprising:

a fuel manifold as recited in claim 1 ;

a combustor dome mounted to the fuel manifold with one or more retainer rings; and

a plurality of fuel injectors disposed in the combustor dome, each fuel injector connected to a fuel injector connector of the fuel manifold and configured to mix air and fuel.

13. The system of claim 12 , wherein the combustor dome is mounted to the fuel manifold with two retaining rings which presses against the combustor dome to provide positive force to engage each fuel injector with each fuel injector connector.

14. The system of claim 13 , wherein the two retainer rings include combustor seals.

15. The system of claim 14 , further comprising a combustor liner disposed between the retainer rings in contact with the combustor seals.

16. The system of claim 12 , wherein the plurality of fuel injectors are disposed in a plurality of circumferential rows to allow radial fuel staging.

17. The system of claim 16 , wherein each fuel injector in a radially outward row and radially inward row are angled relative to an axial axis to effuse fuel and air into the combustor liner parallel to or away from walls of the combustor liner to prevent impingement on the walls of the combustor liner.

18. The system of claim 17 , wherein each of the fuel injectors include one or more standoff features configured to mate with one or more locator apertures defined in the combustor dome to orient each fuel injector on the combustor dome to such that each fuel injector aligns with each fuel injector connector.

19. The system of claim 12 , wherein the plurality of fuel injectors includes about 90 or more fuel injectors.

20. A method of making an internal fuel manifold for a turbomachine, comprising:

additively manufacturing:

an outer ring defining one or more fuel supply channels configured to allow fuel flow around at least a portion of a circumference of the outer ring;

a plurality of branches extending radially inward from the outer ring, wherein the branches include a high aspect ratio shape, wherein the plurality of branches include one or more branch fuel channels in fluid communication with at least one of the one or more fuel supply channels;

one or more injector connectors extending axially aft from each branch, each injector connector in fluid communication with a branch fuel channel and configured to connect to a fuel injector; and

an inner ring extending from the plurality of branches, wherein the inner ring and the outer ring are configured to receive a fuel injector and combustor assembly therebetween and to allow retaining of the fuel injector and combustor assembly to the internal fuel manifold.