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A combustor-to-transition seal (301) includes a spring clip assembly (322, 422, 522) and a first spring metal ring (340, 441) or a ring assembly (440,540) that includes the first spring metal ring (441) and a second spring metal ring (442). Such combustor-to-transition seal (301) provides a first se

A combustor-to-transition seal (301) includes a spring clip assembly (322, 422, 522) and a first spring metal ring (340, 441) or a ring assembly (440,540) that includes the first spring metal ring (441) and a second spring metal ring (442). Such combustor-to-transition seal (301) provides a first seal (321) and a second seal (331, 531) when at a junction of a combustor (108, 308, 508) and a transition (114, 314, 514). In an embodiment, the first spring metal ring (340) has a plurality of apertures (342) through the ring (340) that provide effusion cooling of the ring (340). The plurality of apertures (342) regulates a flow of cooling fluid to maintain an acceptable temperature of the ring (340). In an alternative embodiment, the second spring metal ring (442) has grooves (446) that regulate a flow of cooling fluid to maintain an acceptable temperature of the ring assembly (440).

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1. A combustor-to-transition seal comprising: a spring clip assembly comprising a circular arrangement of leaf springs adapted to provide a first seal between a combustor and a transition, effective to provide mutual support to the combustor and the transition, and to allow a flow of cooling fluid t

1. A combustor-to-transition seal comprising: a spring clip assembly comprising a circular arrangement of leaf springs adapted to provide a first seal between a combustor and a transition, effective to provide mutual support to the combustor and the transition, and to allow a flow of cooling fluid to pass through the spring clip assembly; anda first spring metal ring positioned downstream of the leaf springs, between the combustor and the transition and biased against a sealing surface to form a second seal between the combustor and the transition, the first spring metal ring comprising a plurality of defined passages effective to regulate the flow of cooling fluid there through and to cool the first spring metal ring,wherein the first spring metal ring is positioned partially within a partial slot,wherein the combustor-to-transition seal is configured to permit relative radial motion between the combustor and the transition, and the relative radial motion between the combustor and the transition results in relative radial motion between the sealing surface and the partial slot, andwherein the first spring metal ring is free to move radially within the partial slot to accommodate the relative radial motion. 2. The combustor-to-transition seal of claim 1, wherein the spring clip assembly comprises an inner layer and an outer layer of leaf springs, each layer having respective slots between adjacent leaf springs, the slots of the inner layer being offset to the slots of the outer layer, wherein the spring clip assembly is attached to the combustor and wherein the partial slot is disposed in a transition inlet ring. 3. The combustor-to-transition seal of claim 2, wherein apertures through the first spring metal ring are the plurality of defined passages. 4. The combustor-to-transition seal of claim 3, wherein a sealing member, comprising the sealing surface, is provided between the combustor and the first spring metal ring, and wherein the sealing surface is disposed on a radially outer surface of the sealing member and is in sealing contact with the first spring metal ring. 5. The combustor-to-transition seal of claim 1, comprising a ring assembly comprising the first spring metal ring and a second spring metal ring, the second spring metal ring comprising a plurality of grooves, wherein the plurality of grooves cooperate together with the first spring metal ring to define the plurality of defined passages. 6. The combustor-to-transition seal of claim 5, wherein the partial slot is disposed in a transition inlet ring. 7. The combustor-to-transition seal of claim 5, wherein the partial slot is formed by a U-shaped retainer attached to the combustor. 8. The combustor-to-transition seal of claim 5, wherein a sealing member, comprising the sealing surface is provided between the combustor and the first spring metal ring, and wherein the sealing surface is disposed on a radially outer surface of the sealing member and is in sealing contact with the first spring metal ring. 9. The combustor-to-transition seal of claim 8, wherein the ring assembly is an offset defined leakage ring set wherein the first spring metal ring and the second spring metal ring each comprises a circumferential gap and the circumferential gaps are circumferentially offset from each other. 10. The combustor-to-transition seal of claim 1, wherein the spring clip assembly is attached to the combustor and the partial slot is formed by a U-shaped retainer attached to the combustor. 11. The combustor-to-transition seal of claim 10, comprising a ring assembly comprising the first spring metal ring and a second spring metal ring, the second spring metal ring comprising a plurality of grooves, wherein the plurality of grooves operate together with the first spring metal ring to define the plurality of defined passages. 12. A gas turbine engine comprising the combustor-to-transition seal of claim 1. 13. A gas turbine engine comprising the combustor-to-transition seal of claim 11. 14. The combustor-to-transition seal of claim 1, wherein a radially outer surface of a downstream end of the spring clip assembly comprises the sealing surface in sealing contact with the first spring metal ring. 15. The combustor-to-transition seal of claim 1, wherein a radially outer surface of the combustor comprises the sealing surface in sealing contact with the first spring metal ring. 16. A combustor-to-transition seal comprising: a spring clip assembly comprising a circular arrangement of leaf springs adapted to provide a first seal between a combustor and a transition, the spring clip assembly comprising an inner layer and an outer layer of said leaf springs, each layer having respective slots between adjacent leaf springs, the slots of the inner layer being offset to the slots of the outer layer, wherein the spring clip assembly is attached to the combustor and is effective to mutually support the combustor and the transition and to allow a flow of cooling fluid to pass through the spring clip assembly;a sealing member, positioned on a radially outer surface of the spring clip assembly and comprising a sealing surface; anda ring assembly, positioned downstream of the spring leaves, in contact with the sealing surface, and partially within a partial slot in a transition inlet ring, comprising a first spring metal ring and a second spring metal ring, each said spring metal ring comprising a circumferential gap, the respective circumferential gaps being circumferentially offset one to the other, the second spring metal ring comprising a plurality of grooves, wherein the plurality of grooves abut the first spring metal ring and are effective to regulate the flow of cooling fluid there through and to cool the ring assembly;wherein the first and the second spring metal rings are biased toward the sealing surface to form a second seal against the sealing surface,wherein the combustor-to-transition seal is configured to permit relative radial motion between the combustor and the transition, andwherein the first spring metal ring is free to move radially within the partial slot to accommodate the relative radial motion. 17. A combustor-to-transition seal comprising: a spring clip assembly comprising a circular arrangement of leaf springs adapted to provide a first seal between a combustor and a transition, the spring clip assembly comprising an inner layer and an outer layer of said leaf springs, each layer having respective slots between adjacent leaf springs, the slots of the inner layer being offset to the slots of the outer layer, wherein the spring clip assembly is attached to the combustor and is effective to mutually support the combustor and the transition and to allow a flow of cooling fluid to pass through the spring clip assembly;a ring assembly, positioned downstream of the spring leaves and partially within a U-shaped retainer attached to the combustor, comprising a first spring metal ring and a second spring metal ring, each said spring metal ring comprising a gap, the respective gaps offset one to the other, the second spring metal ring comprising a plurality of grooves, wherein the plurality of grooves are oriented toward the first spring metal ring and the flow of cooling fluid passes through the plurality of grooves, the grooves effective to regulate the flow of cooling fluid there through and to cool the ring assembly;wherein the first spring metal ring and the second spring metal ring are biased against an inner surface of the transition to form a second seal,wherein the combustor-to-transition seal is configured to permit relative radial motion between the combustor and the transition, andwherein the first spring metal ring and the second spring metal ring are free to move radially within the U-shaped retainer to accommodate the relative radial motion.