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In accordance with certain embodiments, a system includes a counterflow injection mechanism. The counterflow injection mechanism includes a fuel-air injection mechanism having fuel and air passages leading to fuel and air injection openings, wherein the fuel and air injection openings are disposed a

In accordance with certain embodiments, a system includes a counterflow injection mechanism. The counterflow injection mechanism includes a fuel-air injection mechanism having fuel and air passages leading to fuel and air injection openings, wherein the fuel and air injection openings are disposed at an off-center position and a generally counterflow direction relative to a generally lengthwise flow axis of a gas turbine combustor.

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1. A system, comprising: a combustion liner disposed with a combustor housing, the combustor liner including an outer casing comprising a plurality of openings formed along a length and configured as compressed air inlets, an inner casing having a closed rear end and a combustion outlet, and an air

1. A system, comprising: a combustion liner disposed with a combustor housing, the combustor liner including an outer casing comprising a plurality of openings formed along a length and configured as compressed air inlets, an inner casing having a closed rear end and a combustion outlet, and an air circulation path extending between and along the inner and outer casings; andan injection mechanism disposed in the combustion liner, comprising: at least one fuel-air injection mechanism comprising a fuel injector extending through the air circulation path, the fuel injector having a fuel passage leading to a fuel injection opening and an air injection assembly leading to an air passage and an air injection opening, wherein the fuel injection opening and the air injection opening are disposed at an off-center position to inject fuel and air toward the closed rear end in a direction counterflow to a generally lengthwise downstream flow of combustion products in an axial gas turbine combustor. 2. The system of claim 1, wherein the fuel injection opening and the air injection opening are disposed in a lobe structure. 3. The system of claim 1, wherein the fuel and air injection openings are disposed in a flush wall portion. 4. The system of claim 1, wherein the fuel and air injection openings are disposed in a cantilevered member. 5. The system of claim 4, wherein the cantilevered member comprises an airfoil structure. 6. The system of claim 1, wherein the fuel injection opening and the air injection opening are disposed in close proximity to one another. 7. The system of claim 1, wherein the injection mechanism comprises a plurality of fuel-air injection mechanisms disposed in a circumferential arrangement. 8. The system of claim 7, wherein the plurality of fuel-air injection mechanisms is disposed in a plurality of lobe structures, or flush wall portions, or cantilevered members, or airfoil structures, or combinations thereof. 9. The system of claim 7, wherein the plurality of fuel-air injection mechanisms is oriented in a generally converging relationship. 10. The system of claim 7, wherein the plurality of fuel-air injection mechanisms includes a plurality of coaxial fuel-air openings oriented in counterflow directions, including substantially lengthwise directional portions, relative to the generally lengthwise flow axis of the axial gas turbine combustor. 11. A system comprising an axial gas turbine combustor comprising: a combustion liner disposed with a combustor housing, the combustor liner including an outer casing comprising a plurality of openings formed along a length and configured as compressed air inlets, an inner casing having a closed rear end and a combustion outlet, an air circulation path extending between and along the inner and outer casings, and a generally lengthwise flow axis extending from a stagnation zone to the combustion outlet; andan injection mechanism disposed in the combustion liner and comprising at least one fuel-air injection mechanism comprising a fuel injector extending through the air circulation path, the fuel injector having a fuel passage leading to a fuel injection opening and an air injection assembly leading to an air injection opening, wherein the fuel injection opening and the air injection opening are disposed at an off-center position to inject fuel and air toward the closed read end in a direction counterflow direction to a generally lengthwise downstream flow of combustion products in the axial gas turbine combustor. 12. The system of claim 11, comprising a gas turbine engine having a turbine and a compressor coupled to the axial gas turbine combustor. 13. The system of claim 12, comprising a power generator, or a propulsion system, or a vehicle, or combinations thereof coupled to the gas turbine engine. 14. A system, comprising: an axial gas turbine combustor, comprising:a combustion liner disposed with a combustor housing, the combustor liner including an outer casing comprising a plurality of openings formed along a length and configured as having a compressed air inlet inlets, an inner casing having a closed rear end and a combustion outlet, an air circulation path extending between and along the inner and outer casings, and a generally lengthwise flow axis extending from a stagnation zone to the combustion outlet; anda plurality of injection mechanisms disposed in the combustion liner downstream from the stagnation zone in a generally off-center position to inject fuel and air toward the closed rear end in a direction counterflow to a generally lengthwise flow of combustion products in the axial gas turbine combustor,wherein each of the plurality of injection mechanisms comprises a fuel passage extending through the air recirculation path of the combustion liner to a fuel injection opening, and an air passage leading to an air injection opening. 15. The system of claim 14, wherein the combustion liner comprises a hollow annular wall including the inner and outer casings, the compressed air inlet comprises a plurality of perforations in the outer casing, and the combustion outlet comprises a turbine nozzle. 16. The system of claim 14, comprising a gas turbine engine including a turbine and a compressor coupled to the axial gas turbine combustor. 17. The system of claim 14, wherein the plurality of fuel injection openings and the plurality of air injection openings are disposed in an airfoil structure cantilevered from the inner casing. 18. The system of claim 17, wherein the plurality of fuel injection openings and the plurality of air injection openings comprise a lengthwise-directed set of coaxial fuel-air openings and a crosswise-directed set of coaxial fuel-air openings. 19. The system of claim 18, wherein the lengthwise-directed set of coaxial fuel-air openings include a first common fuel supply passage and the crosswise-directed set of coaxial fuel-air openings include a second common fuel supply passage, wherein the first and second common fuel supply passages are indepenent from one another. 20. The system of claim 17, wherein the airfoil structure is disposed at least near the combustion outlet and extends across the generally lengthwise flow axis. 21. The system of claim 14, wherein the plurality of fuel injection openings and the plurality of air injection openings are arranged about a circumference of the inner casing at one or more intermediate locations between the stagnation zone and the combustion outlet. 22. The system of claim 21, wherein the plurality of fuel injection openings and the plurality of air injection openings are disposed in a plurality of flush wall portions, or a plurality of lobe structures, or a plurality of inwardly cantilevered members, or a plurality of airfoil structures, or combinations thereof on the inner casing. 23. The system of claim 21, wherein the plurality of fuel injection openings and the plurality of air injection openings are oriented in a generally converging relationship toward the stagnation zone. 24. The system of claim 21, wherein the plurality of fuel injection openings and the plurality of air injection openings comprise a plurality of coaxial fuel-air openings oriented in counterflow directions including substantially lengthwise directional portions, relative to the generally lengthwise flow axis. 25. The system of claim 24, wherein the plurality of coaxial fuel-air openings includes a plurality of substantially lengthwise-directed fuel-air openings.