Fuel manifolds
A fuel injection system includes an outer support defining a fuel manifold and an inner support, with a feed arm extending radially between the inner support and the outer support. A plurality of outlet openings extending in an axial direction from the feed arm for feeding respective injection nozzles. The feed arm defines a plurality of fuel passages therethrough in fluid communication with the fuel manifold and outlet openings to supply fuel from the fuel manifold to the outlet openings. A heat shield extends from the outer support to the inner support and extends about the outer support and the feed arm to provide heat shielding to the fuel manifold and the fuel passages.
1. A method of making a fuel injector system comprising:
additively manufacturing a circumferentially extending outer support together with a circumferentially extending inner support, a feed arm extending radially between the circumferentially extending inner support and the circumferentially extending outer support, and a heat shield extending from the circumferentially extending outer support to the circumferentially extending inner support and extending about the circumferentially extending outer support and the feed arm, wherein the heat shield is spaced apart from the feed arm with an insulative gap, wherein the additively manufacturing includes building in an axial build direction beginning from downstream portions of the circumferentially extending inner and outer supports, wherein the additively manufacturing includes forming the feed arm and a portion of the heat shield adjacent the feed arm by additively growing the feed arm and heat shield in the axial build direction, wherein the feed arm and the portion of the heat shield adjacent to the feed arm are self-supporting as they are grown and are grown to define a vaulted angle on either side of a peak, wherein the vaulted angle is relative to the axial build direction, and wherein the vaulted angle has a component in an axial direction aligned to the axial build direction, and wherein the vaulted angle has a component in a radial direction relative to the axial build direction, wherein the feed arm and the portion of the heat shield adjacent to the feed arm extend substantially linearly from the peak to the circumferentially extending inner support and from the peak to the circumferentially extending outer support to form a V-shape.
2. The method as recited in claim 1 , wherein the additively manufacturing includes forming vaulted weight reduction voids within the feed arm.
3. The method as recited in claim 1 , wherein the additively manufacturing includes forming vaulted fuel manifold passages in the circumferentially extending outer support.