Fuel injector heat exchanger assembly

A heat engine, the heat engine comprising:

• an outer casing defining an exterior surface and an interior surface, wherein the outer casing defines a diffuser cavity therewithin receiving a flow of compressed air;
• a fuel injector assembly coupled to the exterior surface of the outer casing, wherein the fuel injector assembly comprises:
• a body defining an outer surface and an inner surface, wherein the body comprises a plurality of walls in concentric arrangement, and wherein the plurality of walls defines a plurality of passages, wherein the plurality of passages comprises a first passage surrounded by a second passage, and further wherein the plurality of walls defines a third passage surrounding the second passage, wherein each passage is fluidly segregated from one another by the plurality of walls, and further wherein the body comprises a first conduit wall defined through the body from the outer surface and extending radially through the third passage to the second passage, wherein the first conduit wall defines a first conduit in fluid communication with the second passage, and wherein the first conduit wall fluidly segregates the first conduit from the third passage, wherein the first conduit is configured to admit a flow of fluid from outside the fuel injector into the second passage, and further wherein the body comprises a second conduit wall defined through the body from the outer surface and extending radially through the third passage, wherein the second conduit wall defines a second conduit in fluid communication with the second passage, and wherein the second conduit wall fluidly segregates the second conduit from the third passage;
• and
• a flange extended from the outer surface of the body, wherein the flange couples the fuel injector assembly to the exterior surface of the outer casing, and wherein the fuel injector assembly defines a first end proximate to the flange and a second end distal to the first end along the body.