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A fuel injection system comprises a combustor liner, an air tube, a fuel manifold and a fuel injector. The combustor liner defines primary and secondary combustion zones. The air tube extends through the combustor liner along an axis to an exit aperture inside the combustor. The fuel manifold is pos

A fuel injection system comprises a combustor liner, an air tube, a fuel manifold and a fuel injector. The combustor liner defines primary and secondary combustion zones. The air tube extends through the combustor liner along an axis to an exit aperture inside the combustor. The fuel manifold is positioned proximate the combustor line to deliver fuel through the air tube to the primary and secondary combustion zones. The fuel injector is coupled to the fuel manifold and positioned to inject the fuel along an axis of the air tube, such that the fuel has a substantially symmetric distribution at the exit aperture.

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1. A fuel injection system comprising: a combustor liner defining primary and secondary combustion zones;an air tube extending through the combustor liner along an axis to an exit aperture inside the combustor, and comprising a fuel tube formed along an inner axial surface of the air tube which form

1. A fuel injection system comprising: a combustor liner defining primary and secondary combustion zones;an air tube extending through the combustor liner along an axis to an exit aperture inside the combustor, and comprising a fuel tube formed along an inner axial surface of the air tube which forms a boundary for air flow, the fuel tube offset from the axis of the air tube;a fuel manifold positioned proximate the combustor liner to deliver fuel through the air tube to the primary and secondary combustion zones; anda fuel injector coupled to the fuel manifold and positioned to inject the fuel from the fuel tube substantially in a direction parallel to the axis of the air tube, such that the fuel has a substantially symmetric distribution about the axis of the air tube, at the exit aperture. 2. The system of claim 1, wherein the fuel injector comprises an impingement nozzle for injecting the fuel onto an inner surface of the air tube. 3. The system of claim 2, wherein the fuel injector generates a fuel film on the inner surface of the air tube, the fuel film being substantially uniform at the exit aperture with respect to rotation about the axis of the air tube. 4. The system of claim 1, wherein the fuel distribution at the exit aperture is substantially rotationally uniform about the axis of the air tube. 5. The system of claim 4, wherein the fuel distribution at the exit aperture is substantially rotationally uniform about the axis of the air tube, within a nominal variation of twenty-five percent. 6. A turbojet engine comprising the fuel injection system of claim 1. 7. An unmanned flight vehicle comprising the turbojet engine of claim 6. 8. A combustor for a gas turbine engine, the combustor comprising: a combustor liner defining primary and secondary combustion zones;an air tube extending through the combustor liner to an exit aperture, the air tube defining an air tube axis for delivery of fuel and air to the primary and secondary combustion zones, and comprising a fuel tube formed along an inner axial surface of the air tube which forms a boundary for air flow, the fuel tube offset from the axis of the air tube;a fuel manifold positioned proximate the combustor liner to deliver fuel through the air tube into the primary and secondary combustion zones; anda fuel injector coupled to the fuel manifold and receiving fuel from the fuel tube and positioned within the air tube to generate a substantially symmetric fuel distribution with respect to the air tube axis at the exit aperture. 9. The combustor of claim 8, wherein the fuel injector comprises an impingement nozzle positioned to form a fuel film on an inside surface of the air tube, the fuel film being substantially uniform about the air tube axis at the exit aperture. 10. The combustor of claim 8, wherein the fuel injector comprises an impingement nozzle positioned to inject the fuel onto an inner surface of the air tube. 11. The combustor of claim 10, wherein the air tube provides swirl flow to distribute the fuel on the inner surface of the air tube into a substantially uniform fuel film at the exit aperture. 12. An expendable turbojet engine comprising the combustor of claim 8. 13. A turbojet engine comprising: a compressor and a turbine in flow series; anda combustor positioned between the compressor and the turbine in the flow series, the combustor comprising:a liner defining primary and secondary combustion zones;an air tube extending radially through the combustor liner to an exit aperture;a fuel manifold for delivering fuel to the primary and secondary combustion zones along an axis of the air tube; anda fuel injector positioned to inject the fuel substantially in a direction parallel to the axis of the air tube and comprising a fuel tube formed along an inner axial surface of the air tube which forms a boundary for air flow, the fuel tube offset from the axis of the air tube, such that the fuel injector generates a substantially symmetric fuel distribution at the exit aperture of the air tube. 14. The turbojet engine of claim 13, wherein the fuel injector comprises an impingement nozzle for forming the fuel distribution as a fuel film on the inner surface of the air tube. 15. The turbojet engine of claim 14, wherein the fuel film is substantially uniform with respect to rotation about the axis of the air tube at the exit aperture. 16. The turbojet engine of claim 14, wherein the impingement nozzle is positioned off the axis of the air tube, proximate the inner surface. 17. An expendable flight vehicle comprising the turbojet engine of claim 13.