Fluid distributor passages

1. A fluid distributor comprising:

a distributor body defining a plurality of fluid distributor passages therethrough, each of the fluid distributor passages winding in swirl direction about a swirl axis, wherein the swirl direction defines a swirl angle of at least 60 degrees relative to the swirl axis, each of the fluid distributor passages defining a floor and opposed ceiling, and an opposed pair of sidewalls that are straight and parallel with one another in a radial cross-section relative to the swirl axis, wherein at least one of the floor and/or the ceiling is vaulted in a plane that includes the swirl axis to define a surface that is angled less than 60 degrees relative to the swirl axis, wherein both of the ceiling and floor are vaulted in a same direction as each other, wherein the distributor passage has a chevron cross-sectional shape in the radial cross-section relative to the swirl axis.

2. The fluid distributor as recited in claim 1 , wherein the fluid distributor passages are in fluid communication to feed a pressure atomizer.

3. The fluid distributor as recited in claim 1 , wherein the swirl angle is 90 degrees relative to the swirl axis.

4. The fluid distributor as recited in claim 1 , wherein the fluid distributor passages define a conical profile.

5. The fluid distributor as recited in claim 1 , wherein the ceiling is vaulted from each sidewall.

6. An apparatus comprising:

a fluid distributor including a distributor body defining a plurality of fluid distributor passages therethrough, each of the fluid distributor passages winding in swirl direction about a swirl axis, wherein the swirl direction defines a swirl angle of at least 60 degrees relative to the swirl axis, each of the fluid distributor passages defining a floor and opposed ceiling, and an opposed pair of sidewalls that are straight and parallel to one another in a radial cross-section relative to the swirl axis, wherein at least one of the floor and/or the ceiling is vaulted in a plane that includes the swirl axis to define a surface that is angled less than 60 degrees relative to the swirl axis, wherein both of the ceiling and floor are vaulted in a same direction as each other, wherein the distributor passage has a chevron cross-sectional shape in the radial cross-section relative to the swirl axis, wherein the distributor passages are in fluid communication with an annular outlet, wherein the annular outlet is within an air blast atomizer.

7. The apparatus as recited in claim 6 , where the air blast atomizer includes one or both of:

an inner air passage radially inboard of the distributor passages; and/or an outer air passage radially outboard of the distributor passages.

8. The fluid distributor as recited in claim 6 , wherein the distributor passages are liquid fuel passages, and further comprising:

a plurality of gaseous fuel distributor passages each of the gaseous fuel distributor passages winding in a gas swirl direction about the swirl axis, wherein the gas swirl direction defines a gasswirl angle of at least 60 degrees relative to the swirl axis, each of the gaseous fuel distributor passages defining a floor and opposed ceiling, and an opposed pair of sidewalls, wherein at least one of the floor and/or the ceiling is vaulted to define a surface that is angled less than 60 degrees relative to the swirl axis.

9. The fluid distributor as recited in claim 8 , wherein the gaseous fuel distributor passages are radially inboard of the liquid fuel passages.

10. The fluid distributor as recited in claim 8 , wherein the liquid fuel passages and gaseous fuel distributor passages all feed into a single annular outlet orifice.