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An assembly for use in a fuel injection system within a combustor of a combustion turbine engine is described. The assembly may include: a first port formed through an outer radial wall of the combustor and a second port formed through an inner radial wall. A plenum may be formed about the first por

An assembly for use in a fuel injection system within a combustor of a combustion turbine engine is described. The assembly may include: a first port formed through an outer radial wall of the combustor and a second port formed through an inner radial wall. A plenum may be formed about the first port. A tube may be formed that has a first end positioned within the first port and a second end positioned within the second port. At the first end, the tube may be sized smaller than the first port such that two passages are defined therethrough: a first passage defined about an exterior of the tube; and a second passage defined through an interior of the tube.

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1. An assembly for use in a fuel injection system within a combustor of a combustion turbine engine, wherein the combustor includes an inner radial wall, which defines a primary combustion chamber downstream of a primary fuel nozzle, and an outer radial wall, which surrounds the inner radial wall so

1. An assembly for use in a fuel injection system within a combustor of a combustion turbine engine, wherein the combustor includes an inner radial wall, which defines a primary combustion chamber downstream of a primary fuel nozzle, and an outer radial wall, which surrounds the inner radial wall so to form a flow annulus therebetween, the assembly comprising: a first port formed through the outer radial wall;a second port formed through the inner radial wall;a plenum formed about the first port, the plenum comprising a volume disposed outboard of an outer surface of the outer radial wall;a tube comprising a first end positioned within the first port and a second end positioned within the second port, wherein at the first end, the tube is sized smaller than the first port such that two passages are defined therethrough: a first passage defined about an exterior of the tube; and a second passage defined through an interior of the tube; andfuel outlets disposed within the first passage. 2. The fuel injection assembly according to claim 1, further comprising vanes spanning across the first passage, each of the vanes extending from a connection to an edge of the first port to a connection to an outer surface of the tube. 3. The fuel injection assembly according to claim 2, wherein the vanes are spaced around the tube and support the first end of the tube in a fixed central position within the first port. 4. The fuel injection assembly according to claim 3, wherein the fuel outlets are disposed on the vanes. 5. The fuel injection assembly according to claim 4, further comprising a fuel plenum positioned within the outer radial wall that surrounds the first port; wherein each fuel outlet is configured to fluidly communicate with the fuel plenum via channels formed within the vanes; andwherein the fuel plenum includes a connection to a fuel source. 6. The fuel injection assembly according to claim 5, wherein each of the vanes comprises a fin. 7. The fuel injection assembly according to claim 6, wherein each of the fins include an upstream edge and a downstream edge; and wherein each of the vanes includes at least one fuel outlet positioned on one of the upstream edge and the downstream edge of the fin. 8. The fuel injection assembly according to claim 6, wherein each fin is aligned substantially parallel to a center axis of the first port. 9. The fuel injection assembly according to claim 6, wherein each fin is canted in relation to a center axis of the first port so to produce a swirling flow to a fluid passing through the first passage. 10. The fuel injection assembly according to claim 3, wherein an edge of the first end of the tube resides approximately coplanar to the first port. 11. The fuel injection assembly according to claim 3, wherein an edge of the first end of the tube extends to a position just outboard of a plane of the first port. 12. The fuel injection assembly according to claim 3, wherein a cross-sectional shape of the first end of the tube is roughly circular; and wherein a cross-sectional shape of the first port is roughly circular. 13. The fuel injection assembly according to claim 12, wherein the plenum is defined by a plenum wall that extends outboard from a footprint on the outer surface of the outer radial wall. 14. The fuel injection assembly according to claim 13, wherein the plenum wall comprises a dome shape; and wherein the first end of the tube and the first port are configured such that a cross-sectional flow area of the second passage is approximately 5 to 8 times a cross-sectional flow area of the first passage. 15. The fuel injection assembly according to claim 14, wherein the plenum wall extends outboard and tapers gradually to a plenum ceiling that defines an outboard boundary of the plenum; wherein the plenum ceiling includes an inboard extending flow guide, the flow guide having a center axis approximately aligned with a center axis of the tube;wherein the flow guide comprising a circular cross-sectional shape that tapers to a distal end; andwherein the flow guide is configured such that the distal end comprises a position inboard of a plane of the first port. 16. The fuel injection assembly according to claim 12, wherein the footprint of the plenum wall includes a rough circular shape; wherein the footprint of the plenum wall, the first end of the tube, and the first port each comprise a similar rough circular shape; andwherein the footprint of the plenum wall, the first end of the tube, and the first port comprise a concentric arrangement. 17. The fuel injection assembly according to claim 3, wherein, between the first end and the second end, the tube includes a venturi section. 18. The fuel injection assembly according to claim 17, wherein the venturi section includes a converging section that converges to a throat as the venturi section extends inboard; wherein, as the venturi section extends further inboard from the throat, the venturi section includes a diverging section. 19. The fuel injection assembly according to claim 18, wherein the venturi section is configured such that a plane of the throat is positioned near a plane of the first port. 20. The fuel injection assembly according to claim 3, wherein, between the first end and the second end, the tube comprises a solid structure configured such that a fluid moving through the tube is isolated from a cross flow of fluid moving through the flow annulus; and wherein the plenum is defined by a plenum wall that extends outboard from a footprint on the outer surface of the outer radial wall; and wherein the plenum wall comprises a solid structure configured such that a fluid moving through the plenum is isolated from a fluid moving along the outer surface of the outer radial wall or an outer surface of the plenum wall. 21. The fuel injection assembly according to claim 3, wherein the inner radial wall comprises a liner and the outer radial wall comprises a flow sleeve; wherein the flow sleeve includes a longitudinally extending fuel passageway formed therein, and wherein the fuel passageway connects to the fuel plenum, wherein the fuel injection assembly comprises a late lean injection system that is configured to inject a mixture of fuel and air within an aft end of a primary combustion chamber defined by the liner; andwherein the flow annulus is configured to carry a supply of compressed air toward a forward end of the combustor. 22. The fuel injection assembly according to claim 3, wherein the inner radial wall comprises a transition piece and the outer radial wall comprises an impingement sleeve.