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A multi-zone combustor is provided and includes a pre-mixer configured to output a first mixture to a primary zone of a combustor section and a stepped center body disposable in an annulus defined within the pre-mixer. The stepped center body includes an outer body configured to output at a first ra

A multi-zone combustor is provided and includes a pre-mixer configured to output a first mixture to a primary zone of a combustor section and a stepped center body disposable in an annulus defined within the pre-mixer. The stepped center body includes an outer body configured to output at a first radial and axial step a second mixture to a secondary zone of the combustor section and an inner body disposable in an annulus defined within the outer body and configured to output at a second radial and axial step a third mixture to a tertiary zone of the combustor section.

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1. A multi-zone combustor, comprising: a pre-mixer configured to output a first mixture to a primary zone of a combustor section; anda stepped center body disposed in a first annulus defined within the pre-mixer and including: an outer tube configured to output at a first radial and axial step a sec

1. A multi-zone combustor, comprising: a pre-mixer configured to output a first mixture to a primary zone of a combustor section; anda stepped center body disposed in a first annulus defined within the pre-mixer and including: an outer tube configured to output at a first radial and axial step a second mixture to a secondary zone of the combustor section downstream of the primary zone, andan inner tube positioned within the outer tube, thereby defining a second annulus between the outer tube and the inner tube, the inner tube being configured to output at a second radial and axial step a third mixture to a tertiary zone of the combustor section downstream of the secondary zone,wherein the inner tube, the outer tube, and the pre-mixer are concentrically arranged around a common longitudinal axis. 2. The multi-zone combustor according to claim 1, wherein the first mixture, the second mixture and the third mixture are provided to the pre-mixer, to the outer tube, and to the inner tube, respectively, by a first fuel circuit, a second fuel circuit, and a third fuel circuit. 3. The multi-zone combustor according to claim 1, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output in a co-rotation condition. 4. The multi-zone combustor according to claim 1, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output in a counter-rotation condition. 5. The multi-zone combustor according to claim 1, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output with equal rotation angles. 6. The multi-zone combustor according to claim 1, wherein the stepped center body further includes an additional body disposed between the outer tube and the inner tube and configured to output at a third radial and axial step a fourth mixture to a fourth zone of the combustor section, the fourth zone being located axially between the secondary zone and the tertiary zone. 7. A multi-zone combustor, comprising: a combustor body having a head end, a combustor section downstream from the head end and a mixing section interposed between the head end and the combustor section;a pre-mixer extendible from the head end through the mixing section and configured to output at a first axial location a first mixture to the combustor section; anda stepped center body disposed in a first annulus defined within the pre-mixer and including: an outer tube configured to output at a second axial location downstream from the first axial location a second mixture to the combustor section, andan inner tube positioned within the outer tube, thereby defining a second annulus between the outer tube and the inner tube, the inner tube being configured to output at a third axial location downstream from the second axial location a third mixture to the combustor section,wherein the inner tube, the outer tube, and the pre-mixer share a common longitudinal axis. 8. The multi-zone combustor according to claim 7, wherein the first mixture, the second mixture and the third mixture are provided to the pre-mixer, to the outer tube, and to the inner tube, respectively, by a first fuel circuit, a second fuel circuit, and a third fuel circuit. 9. The multi-zone combustor according to claim 7, wherein the second mixture and the third mixture include air and no amount or trace amounts of fuel during turndown operations. 10. The multi-zone combustor according to claim 7, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output in a co-rotation condition. 11. The multi-zone combustor according to claim 7, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output in a counter-rotation condition. 12. The multi-zone combustor according to claim 7, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output with equal rotation angles. 13. The multi-zone combustor according to claim 7, wherein the stepped center body further includes an additional body disposed between the outer tube and the inner tube and configured to output at a fourth axial location downstream from the second axial location a fourth mixture to the combustor section. 14. A multi-zone combustor, comprising: a combustor body having a head end, a combustor section downstream from the head end and a mixing section interposed between the head end and the combustor section;a pre-mixer extendible from the head end through the mixing section and configured to output at a first axial location a first mixture to the combustor section, the pre-mixer defining a first annulus along a longitudinal axis of the combustor body; anda stepped center body disposed in the first annulus and including: an outer tube having a first length and configured to output at a second axial location downstream from the first axial location a second mixture to the combustor section, andan inner tube positioned within the outer tube, thereby defining a second annulus between the outer tube and the inner tube, the inner tube having a second length longer than the first length and being configured to output at a third axial location downstream from the second axial location a third mixture to the combustor section. 15. The multi-zone combustor according to claim 14, wherein the first mixture, the second mixture and the third mixture are provided to the pre-mixer, to the outer tube, and to the inner tube, respectively, by a first fuel circuit, a second fuel circuit, and a third fuel circuit. 16. The multi-zone combustor according to claim 14, wherein the second mixture and the third mixture include air and no amount or trace amounts of fuel during turndown operations. 17. The multi-zone combustor according to claim 14, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output in a co-rotation condition. 18. The multi-zone combustor according to claim 14, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output in a counter-rotation condition. 19. The multi-zone combustor according to claim 14, wherein a first plurality of vanes are positioned within the second annulus and a second plurality of vanes are positioned within the inner tube, the first plurality of vanes and the second plurality of vanes being configured such that the second mixture and the third mixture are each output with equal rotation angles. 20. The multi-zone combustor according to claim 14, wherein the stepped center body further includes an additional body disposed between the outer tube and the inner tube and configured to output at a fourth axial location downstream from the second axial location a fourth mixture to the combustor section.