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An engine assembly includes a combustor having a combustion chamber in which an air and fuel mixture is combusted to produce combustion gases. The engine assembly further includes a transition scroll coupled to the combustor for receiving the combustion gases. The transition scroll includes an inter

An engine assembly includes a combustor having a combustion chamber in which an air and fuel mixture is combusted to produce combustion gases. The engine assembly further includes a transition scroll coupled to the combustor for receiving the combustion gases. The transition scroll includes an interior surface, an exterior surface, and effusion cooling holes for providing cooling air to the interior surface. The engine assembly further includes a turbine coupled to the transition scroll for receiving and extracting energy from the combustion gases.

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1. An engine assembly, comprising: a combustor comprising a combustion chamber in which an air and fuel mixture is combusted to produce combustion gases;a transition scroll coupled to the combustor for receiving the combustion gases, the transition scroll comprising an interior surface, an exterior

1. An engine assembly, comprising: a combustor comprising a combustion chamber in which an air and fuel mixture is combusted to produce combustion gases;a transition scroll coupled to the combustor for receiving the combustion gases, the transition scroll comprising an interior surface, an exterior surface, and effusion cooling holes for providing cooling air to the interior surface, wherein the transition scroll is helical with an inlet and a B-width outlet; anda turbine coupled to the transition scroll for receiving and extracting energy from the combustion gases. 2. The engine assembly of claim 1, wherein at least a portion of the effusion cooling holes are adjacent to the inlet. 3. The engine assembly of claim 1, wherein the transition scroll has an inner portion and an outer portion, the effusion cooling holes comprising a first group with a first density on the outer portion and a second group with a second density on the inner portion, the first density being greater than the second density. 4. The engine assembly of claim 1, wherein the transition scroll has a non-circular cross-section. 5. The engine assembly of claim 1, wherein the transition scroll comprises an inlet and a main body coupled to the inlet, the effusion cooling holes being formed on the inlet. 6. The engine assembly of claim 5, wherein the effusion cooling holes are additionally formed on the main body. 7. The engine assembly of claim 6, wherein the effusion cooling holes on the inlet have a greater density than the effusion cooling holes on the main body. 8. The engine assembly of claim 6, wherein the main body has a helical configuration with an inner section and an outer section, the effusion cooling holes on the main body comprising a first group with a first density on the outer section and a second group with a second density on the inner section, the first density being greater than the second density. 9. The engine assembly of claim 6, wherein main body comprises a first wall coupled to a second wall. 10. The engine assembly of claim 9, wherein the first wall and second wall each have a first portion and a seam portion at which the first and second walls are coupled together, and the effusion cooling holes being oriented at a first angle in the first portions and at a second angle in the seam portions, the second angle being larger than the first angle. 11. The engine assembly of claim 1, wherein the effusion cooling holes comprise a first group with a first density and a second group with a second density. 12. The engine assembly of claim 1, wherein the effusion cooling holes are unevenly spaced. 13. A transition scroll for receiving combustion gases from a combustor and providing the combustion gases to a turbine, the transition scroll comprising: a body configured to extend between the combustor and the turbine scroll, the body having a hot surface and a cold surface during operation; andeffusion cooling holes formed in the body for supplying cooling air to the hot surface, wherein the effusion cooling holes comprise a first group with a first density and a second group with a second density, and wherein the body is helical with an inlet and an outlet, at least a portion of the effusion cooling holes being adjacent the inlet. 14. The transition scroll of claim 13, wherein the outlet is a B-width outlet. 15. The transition scroll of claim 14, wherein the body has an inner portion and an outer portion, the first group of effusion cooling holes being positioned on the outer portion and the second group of effusion cooling holes being positioned on the inner portion, the first density being greater than the second density. 16. The transition scroll of claim 13, wherein the body has a non-circular cross-section. 17. The transition scroll of claim 13, wherein the effusion cooling holes are unevenly spaced. 18. An engine assembly, comprising: a can combustor comprising a combustion chamber in which an air and fuel mixture is combusted to produce combustion gases;a turbine for receiving and extracting energy from the combustion gases; anda transition scroll coupling the can combustor to the turbine, the transition scroll being helical with an inlet coupled to the can combustor and a B-width outlet coupled to the turbine, the transition scroll having a hot surface, a cold surface, and effusion cooling holes for providing a layer of cooling air to the hot side, the transition scroll further having an inner portion and an outer portion, the effusion cooling holes comprising a first group with a first density on the outer portion and a second group with a second density on the inner portion, the first density being greater than the second density.