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A combustor section is provided and includes one or more annular quaternary fuel manifolds mounted within an annular passage defined between a casing and a cap assembly of a combustor through which air and/or a fuel/air mixture flows upstream from a fuel nozzle support, the manifold including a body

A combustor section is provided and includes one or more annular quaternary fuel manifolds mounted within an annular passage defined between a casing and a cap assembly of a combustor through which air and/or a fuel/air mixture flows upstream from a fuel nozzle support, the manifold including a body to accommodate quaternary fuel therein, the body defining injection holes through which the quaternary fuel is injected into a section of the passage at a location upstream from the fuel nozzle support.

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1. A combustor section, comprising: one or more annular quaternary fuel manifolds mounted within a section of an annular passage defined between a casing and a cap assembly of a combustor through which air and/or a fuel/air mixture flows upstream from a fuel nozzle support,the annular passage being

1. A combustor section, comprising: one or more annular quaternary fuel manifolds mounted within a section of an annular passage defined between a casing and a cap assembly of a combustor through which air and/or a fuel/air mixture flows upstream from a fuel nozzle support,the annular passage being defined such that the air and/or the fuel/air mixture flows through the annular passage in a reverse direction radially outwardly of the fuel nozzle support and in a forward direction radially aligned with the fuel nozzle support,the section of the annular passage being provided where the air and/or the fuel/air mixture flows in the reverse direction,each manifold including a body to accommodate quaternary fuel therein, the body defining injection holes through which the quaternary fuel is injected into the section of the annular passage at an axial location upstream from the fuel nozzle support,the fuel nozzle support being one of a plurality of fuel nozzle supports and the combustor section further comprising an annular baffle extending axially from the cap assembly along a local flow direction to surround the plurality of fuel nozzle supports,the section of the annular passage being radially interposed between the casing and the annular baffle and interposed between an axial location of the fuel nozzle support and an axial location at which the air and/or the fuel/air mixture changes from flowing in the reverse direction to flowing in the forward direction. 2. The combustor section according to claim 1, wherein the one or more manifolds accommodate up to 30% by mass of total combustor fuel. 3. The combustor section according to claim 1, wherein the injection holes are perimetrically arrayed around each of the one or more manifolds. 4. The combustor section according to claim 1, wherein each of the one or more manifolds have identical cross-sectional geometries. 5. The combustor section according to claim 1, wherein the respective body of each of the one or more manifolds comprises a full ring-shaped casing. 6. The combustor section according to claim 1, wherein the respective body of each of the one or more manifolds comprises first and second opposing sides, at least one of which is tapered, the taper being aligned with an incoming flow direction. 7. The combustor section according to claim 1, wherein the one or more manifolds are plural in number and at least one of the plural manifolds is radially outward of another one of the plural manifolds. 8. The combustor section according to claim 7, wherein the one or more manifolds are fueled independently with differing fuels, diluents and/or steam. 9. The combustor section according to claim 7, wherein the one or more manifolds are axially staggered. 10. The combustor section according to claim 1, further comprising: a fuel source; anda substantially radially oriented supply line coupled to the fuel source by which fuel is supplied from the fuel source to the space. 11. The combustor section according to claim 1, wherein the one or more annular fuel manifolds are mounted within a section of the annular passage where the air and/or the fuel/air mixture flows at a velocity that exceeds flow velocities of the air and/or the fuel/air mixture at other sections of the annular passage.