Patent ID: 8360342

Claim:
A system, comprising: a fuel injector, comprising: a fuel conduit configured to inject a fuel; a first oxygen conduit configured to inject oxygen; an annular coolant chamber comprising an inner annular wall and an outer annular wall, wherein the outer annular wall comprises a portion of an external wall of the fuel injector; a cooling coil disposed surrounding the external wall, wherein the cooling coil comprises an entrance coupled to the annular coolant chamber through the external wall, the entrance is configured to convey a coolant to the annular coolant chamber, the cooling coil comprises an exit coupled to the annular coolant chamber through the external wall, and the exit is configured to carry the coolant away from the annular coolant chamber; and a first annular structural support extending through the annular coolant chamber between the inner annular wall and the outer annular wall, wherein the first annular structural support divides the annular coolant chamber into a first passage and a second passage, and the first annular structural support comprises a first flow divider wall that isolates a first coolant flow in the first passage relative to a second coolant flow in the second passage.