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A gas turbine engine ( 10 ) includes a catalytic oxidation module ( 28 ). The catalytic oxidation module includes a pressure boundary element ( 30 ); a catalytic surface ( 32 ); and an opening ( 34 ) in the pressure boundary element to allow premixing of the fluids before the fluids enter a downstre

A gas turbine engine ( 10 ) includes a catalytic oxidation module ( 28 ). The catalytic oxidation module includes a pressure boundary element ( 30 ); a catalytic surface ( 32 ); and an opening ( 34 ) in the pressure boundary element to allow premixing of the fluids before the fluids enter a downstream plenum. In an embodiment, the pressure boundary element includes a catalyst-coated tube ( 58 ) having holes ( 68 ) formed therein to allow mixing across the tube. In another embodiment, the pressure boundary element includes a tubesheet ( 44 ) having a first fluid passageway intersecting a second fluid passageway to premix the fluids upstream of the outlet end of the tubesheet. In yet another embodiment, the catalytic oxidation module includes an upstream tubesheet ( 86 ) for mounting a tube inlet end ( 73 ) and a downstream tubesheet ( 78 ) for mounting a tube outlet end ( 72 ) so that the tube is slidably contained there between.

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1. A catalytic oxidation module for a gas turbine engine comprising:a pressure boundary element, comprising a tube and a downstream tubesheet comprising a first opening receiving the tube, the pressure boundary element having an inlet end and an outlet end in fluid communication with a downstream pl

1. A catalytic oxidation module for a gas turbine engine comprising:a pressure boundary element, comprising a tube and a downstream tubesheet comprising a first opening receiving the tube, the pressure boundary element having an inlet end and an outlet end in fluid communication with a downstream plenum, the pressure boundary element separating a first fluid flow of a combustion mixture from a second fluid flow;a catalytic surface exposed to the first fluid flow between the inlet end and the outlet end; anda second opening in the tubesheet having an inlet end remote from the first opening and having an outlet end in fluid communication with the first opening to allow mixing of the first fluid flow and the second fluid flow within the tubesheet upstream of the outlet end of the pressure boundary element. 2. The catalytic oxidation module of claim 1, wherein the second fluid flow comprises a cooling fluid containing no combustible fuel. 3. The catalytic oxidation module of claim 1, wherein the catalytic surface comprises a surface of the pressure boundary element. 4. The catalytic oxidation module of claim 1, further comprising a third opening is formed in the tube. 5. The catalytic oxidation module of claim 4, wherein the third opening comprises a plurality of holes formed in the tube. 6. The catalytic oxidation module of claim 4, wherein the third opening comprises a plurality of slots formed in the tube. 7. The catalytic oxidation module of claim 6, wherein the slots are formed in the outlet end to form annular fingers. 8. The catalytic oxidation module of claim 1, the tubesheet further comprising a passageway for receiving the tube, the passageway having a first diameter at an inlet side and a second diameter larger than the first diameter at an outlet side. 9. The catalytic oxidation module of claim 8, wherein the tube is slidably engaged within the tubesheet passageway to facilitate axial expansion and contraction of the tube. 10. The catalytic oxidation module of claim 9, wherein the passageway comprises a counterbore on the inlet side terminating in a shoulder. 11. The catalytic oxidation module of claim 1, further comprising an upstream tubesheet connected to the inlet end of the tube, the upstream tubesheet comprising an upstream tubesheet passageway for receiving the tube, the upstream tubesheet passageway comprising a counterbore terminating in a shoulder for receiving the tube, wherein the tube is slidably engaged within the counterbore to facilitate axial expansion and contraction of the tube. 12. The catalytic oxidation module of claim 1, the downstream tubesheet further comprising a first fluid passageway comprising a first fluid inlet opening receiving the first fluid flow and a first fluid outlet opening, the downstream tubesheet further comprising a second fluid passageway receiving the outlet end of the tube and directing the second fluid flow to a downstream plenum, the first fluid passageway intersecting the second fluid passageway upstream of the downstream plenum. 13. The catalytic oxidation module of claim 12, wherein the second fluid passageway flares from a smaller diameter proximate a tubesheet inlet side to a larger diameter proximate a downstream tubesheet outlet side. 14. The catalytic oxidation module of claim 13, wherein the downstream tubesheet outlet side is configured to have a surface area effective to minimize flameholding points. 15. The catalytic oxidation module of claim 12, wherein the tube is slidable within the second fluid passageway to accommodate axial expansion and contraction of the tube. 16. The catalytic oxidation module of claim 15, wherein the second fluid passageway comprises a counterbore terminating in a shoulder for receiving the tube. 17. The catalytic oxidation module of claim 1, further comprising an upstream tubesheet connected to the inlet end of the tube, the upstream tubesheet comprising an upstream tubesheet passageway for receiving the tube, the upstream tubeshee t passageway comprising a counterbore terminating in a shoulder for receiving the tube, wherein the tube is slidably engaged within the counterbore to facilitate axial expansion and contraction of the tube. 18. The catalytic oxidation module of claim 1, further comprising a baffle disposed between the pressure boundary element inlet end and the pressure boundary element outlet end for regulating the fluid communication between the first and second fluid flows. 19. A catalytic oxidation module for a gas turbine engine comprising:a pressure boundary element having an inlet end and an outlet end in fluid communication with a downstream plenum, the pressure boundary element separating a first fluid flow of a combustion mixture from a second fluid flow;a catalytic surface exposed to the first fluid flow between the inlet end and the outlet end;an opening in the pressure boundary allowing fluid communication between the first and second fluid flows upstream of the outlet end;wherein the pressure boundary element comprises a tube;wherein the opening comprises a plurality of slots formed in the tube;wherein the slots are formed in the outlet end to form annular fingers; andwherein the fingers are biased radially away from a tube centerline to provide a biased engagement when the tube is extended into a corresponding opening. 20. A gas turbine engine comprising:a compressor for supplying a first and second fluid flow of compressed air;a fuel supply for injecting a combustible fuel into the first fluid flow;a catalytic oxidation module for at least partially combusting the combustible fuel in the first fluid flow and providing at least partial mixing of the first and second fluid flowsa combustion completion chamber receiving the first and second fluid flows from the catalytic oxidation module and producing a hot gas; anda turbine for receiving the hot gas from the combustion completion chamber;wherein the catalytic oxidation module further comprises a pressure boundary element, comprising a tube and a downstream tubesheet comprising a first opening receiving the tube, the pressure boundary element having an inlet end and having an outlet end in fluid communication with the combustion completion chamber, the pressure boundary element separating the first and second fluid flows along a portion of its length;a catalytic surface exposed to the first fluid flow between the inlet and outlet ends;a second opening in the tubesheet having an inlet end remote from the first opening and having an outlet end in fluid communication with the first opening to allow mixing of the first fluid flow and the second fluid flow within the tubesheet upstream of the outlet end of the pressure boundary element. 21. The gas turbine engine of claim 20, further comprising a third opening is formed in the tube. 22. The gas turbine engine of claim 21, wherein the third opening comprises a plurality of holes formed in the tube. 23. The gas turbine engine of claim 21, wherein the third opening comprises a plurality of slots formed in the tube. 24. The gas turbine engine of claim 23, wherein the slots are formed in the outlet end to form annular fingers. 25. The gas turbine engine of claim 20, the tubesheet comprising a passageway for receiving the tube, the passageway having a first diameter at an inlet side and a second diameter larger than the first diameter at an outlet side. 26. The gas turbine engine of claim 20, further comprising an upstream tubesheet connected to the inlet end of the tube, the upstream tubesheet comprising an upstream tubesheet passageway for receiving the tube, the upstream tubesheet passageway comprising a counterbore terminating in a shoulder for receiving the tube, wherein the tube is slidably engaged within the counterbore to facilitate axial expansion and contraction of the tube. 27. The gas turbine engine of claim 20, wherein the tubesheet further comprises a first fluid passageway comprising a first fluid inlet opening receiving the f irst fluid flow and a first fluid outlet opening and a second fluid passageway receiving the outlet end of the tube and directing the second fluid flow to a downstream plenum, the first fluid passageway intersecting the second fluid passageway upstream of the downstream plenum. 28. The gas turbine engine of claim 27, wherein the second fluid passageway flares from a smaller diameter proximate a tubesheet inlet side to a larger diameter at an outlet side. 29. The gas turbine engine of claim 20, further comprising an upstream tubesheet connected to the inlet end of the tube, the upstream tubesheet comprising an upstream tubesheet passageway for receiving the tube, the upstream tubesheet passageway comprising a counterbore terminating in a shoulder for receiving the tube, wherein the tube is slidably engaged within the counterbore to facilitate axial expansion and contraction of the tube. 30. A gas turbine engine comprising:a compressor for supplying a first and second fluid flow of compressed air;a fuel supply for injecting a combustible fuel into the first fluid flow;a catalytic oxidation module for at least partially combusting the combustible fuel in the first fluid flow and providing at least partial mixing of the first and second fluid flows;a combustion completion chamber receiving the first and second fluid flows from the catalytic oxidation module and producing a hot gas;a turbine for receiving the hot gas from the combustion completion chamber;wherein the catalytic oxidation module further comprises a pressure boundary element having an inlet end and having an outlet end in fluid communication with the combustion completion chamber, the pressure boundary element separating the first and second fluid flows along a portion of its length;a catalytic surface exposed to the first fluid flow between the inlet and outlet ends;an opening in the pressure boundary element allowing fluid communication between the first and second fluid flows upstream of the outlet end;wherein the pressure boundary element comprises a tube;wherein the opening comprises a plurality of slots formed in the tube;wherein the slots are formed in the outlet end to form annular fingers; andwherein the fingers are biased radially away from a tube centerline to provide a biased engagement when the tube is extended into a corresponding opening. 31. A catalytic oxidation module for a gas turbine engine comprising:a plurality of tubes having inlet and outlet ends, the outlet ends inserted into a corresponding first plurality of passageways in a tubesheet;a first fluid flow flowing within an inside diameter of the tubes and exhausted into a downstream combustion chamber through the tubesheet at the respective outlet ends;a second fluid flow flowing among the tubes along an outside diameter of the tubes and exhausted into the downstream combustion chamber through a second plurality of passageways in the tubesheet;an opening formed in each respective tube sized to allow partial mixing of the first and second fluid flows upstream of the tubesheet so that one of the first and second flows is split to exit through both the tubes and the second plurality of passageways wherein the opening comprises a plurality of slots in the respective outlet ends defining annular fingers biased radially away from a centerline of the respective tube to provide a biased engagement between the tube and the tubesheet when the tube is extended into a corresponding passageway; anda catalytic surface formed on either an outside diameter or an inside diameter surface of the tubes. 32. A catalytic oxidation module for a gas turbine engine comprising:a pressure boundary element, comprising a tube and a downstream tubesheet comprising a first opening receiving the tube, the pressure boundary element having an inlet end and an outlet end in fluid communication with a downstream plenum, the pressure boundary element separating a first fluid flow of a combustion mixture from a second fluid flow;a catalytic surface exposed to the first fluid flow between the inlet end and the outlet end;a tubesheet connected to the outlet end of the pressure boundary element; anda second opening in the tubesheet having an inlet end remote from the first opening and having an outlet end in fluid communication with the first opening to allow mixing of the first fluid flow and the second fluid flow within the tubesheet. 33. The catalytic oxidation module of claim 32, wherein the tubesheet comprises a tapered passageway for receiving the pressure boundary element, the passageway comprising an inlet having a inlet cross sectional area and an outlet having an outlet cross sectional area larger than the inlet cross sectional area wherein the opening intersects the tapered passageway within the tubesheet.