Internal fuel manifolds

1. A fluid manifold for providing fuel to a gas turbine, comprising:

a manifold body including

a first annular passage defined along and between a first wall of the manifold body and a second wall of the manifold body; and

a second annular passage defined along and between the second wall of the manifold body and a third wall of the manifold body, wherein

each annular passage of the first and second annular passages feeds into a respective annular chamber defined between a respective pair of directly adjacent walls of the first, second, and third walls, and includes a respective plurality of distinct outlet passages branching off the respective annular chamber, the first, second, and third walls are trumpet shaped walls that extend axially along the first and second annular passage and turn radially along the respective annular chamber.

2. The fluid manifold as recited in claim 1 , further comprising a third annular passage nested radially inward of the second annular passage, wherein the third annular passage is defined between the third wall of the manifold body and a fourth wall of the manifold body radially inward from the third wall of the manifold body.

3. The fluid manifold as recited in claim 2 , further comprising at least one additional annular passage, wherein a first one of the at least one additional annular passage is nested radially inwardly from the third annular passage and is defined between the third wall of the manifold body and a fourth wall of the manifold body radially inward from the third wall of the manifold body, and wherein any additional ones of the at least one additional annular passage are each nested successively inwardly from a respective annular passage and are respectively defined between two respective walls of the manifold body.

4. The fluid manifold as recited in claim 1 , wherein the respective plurality of distinct outlet passages is in fluid communication with a radially outward facing surface of the fluid manifold.

5. The fluid manifold as recited in claim 1 , wherein the respective plurality of distinct outlet passages is in fluid communication with an axially facing surface of the fluid manifold.

6. The fluid manifold as recited in claim 1 , wherein each outlet passages of the respective plurality of distinct outlet passages extends in a radial direction from the respective annular chamber.

7. The fluid manifold as recited in claim 6 , wherein each outlet passages of the respective plurality of distinct outlet passages meets the respective annular chamber at a rounded corner.

8. The fluid manifold as recited in claim 1 , wherein each of the first annular passage and the second annular passage is in fluid communication with a respective inlet feed passage that feeds into a respective annular passage of the first annular passage and the second annular passage tangentially to induce spin on fluids flowing therethrough.

9. The fluid manifold as recited in claim 8 , wherein the respective inlet feed passage is in fluid communication with an axial facing surface of the fluid manifold.

10. The fluid manifold as recited in claim 1 , wherein the manifold body defines a central passage therethrough configured to receive an ignitor of the gas turbine.

11. The fluid manifold as recited in claim 1 , wherein the manifold body including the first wall, second wall, and third wall, is a single monolithic object.

12. A system comprising:

a combustor case defining a manifold receptacle bore therethrough;

a manifold including a manifold body seated in the manifold receptacle to plug seal pressure within the combustor case, wherein the manifold body including

a first annular passage defined along and between a first wall of the manifold body and a second wall of the manifold body, wherein the second wall is radially inward from the first wall, and

a second annular passage nested radially inward of the firsts annular passage, wherein the second annular passage is defined along and between the second wall of the manifold body and a third wall of the manifold body radially inward from the second wall of the manifold body, wherein

each annular passage of the first and second annular passage feeds into a respective annular chamber defined between a respective pair of directly adjacent walls of the first, second, and third walls, and includes a respective plurality of distinct outlet passages branching off the respective annular chamber, the first, second, and third walls are trumpet shaped walls that extend axially along the first and second annular passage and turn radially outward along the respective annular chamber; and

an injector including first and second fuel circuits each in fluid communication with the first and second annular passages, respectively.

13. The system as recited in claim 12 , wherein the manifold includes two additional annular passages in addition to the first annular passage and the second annular passage, and wherein each of the two additional annular passages is in fluid communication with a respective fuel circuit in the injector for dual fuel, dual stage fuel injection.

14. The system as recited in claim 12 , further comprising an ignitor seated in a central passage of the manifold body for ignition of fuel issued from the injector.