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A seal apparatus in a gas turbine engine between a transition duct and a vane structure in a first row vane assembly. The seal apparatus includes a transition seal structure associated with the transition duct and a vane seal structure associated with the vane structure. The transition seal structur

A seal apparatus in a gas turbine engine between a transition duct and a vane structure in a first row vane assembly. The seal apparatus includes a transition seal structure associated with the transition duct and a vane seal structure associated with the vane structure. The transition seal structure includes a transition base portion that defines a first axially facing surface, a first transition lip member extending axially from the first axially facing surface, and a second transition lip member radially spaced from the first transition lip member and extending axially from the first axially facing surface. The vane seal structure includes a vane base portion that defines a second axially facing surface, a first vane lip member extending axially from the second axially facing surface, and a second vane lip member radially spaced from the first vane lip member and extending axially from the second axially facing surface.

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1. A seal apparatus in a gas turbine engine between a transition duct and a vane structure in a first row vane assembly, said seal apparatus comprising: a transition seal structure associated with the transition duct, said transition seal structure comprising: a transition base portion associated wi

1. A seal apparatus in a gas turbine engine between a transition duct and a vane structure in a first row vane assembly, said seal apparatus comprising: a transition seal structure associated with the transition duct, said transition seal structure comprising: a transition base portion associated with the transition duct and defining a first axially facing surface;a first transition lip member extending axially from said first axially facing surface of said transition base portion; anda second transition lip member radially spaced from said first transition lip member and extending axially from said first axially facing surface of said transition base portion such that a transition channel is located between said first transition lip member, said second transition lip member, and said transition base portion;a vane seal structure associated with the vane structure, said vane seal structure comprising: a vane base portion associated with the vane structure and defining a second axially facing surface;a first vane lip member extending axially from said second axially facing surface of said vane base portion; anda second vane lip member radially spaced from said first vane lip member and extending axially from said second axially facing surface of said vane base portion such that a vane channel is located between said first vane lip member, said second vane lip member, and said vane base portion;wherein said first transition lip member overlaps said first vane lip member in an axial direction and said second transition lip member overlaps said second vane lip member in the axial direction;wherein one of: a transition lip member is received in said vane channel; anda vane lip member is received in said transition channel; andwherein said transition channel and said vane channel define a labyrinth path for fluids passing through the seal apparatus. 2. The seal apparatus of claim 1, further comprising a seal member located in at least one of said transition channel and said vane channel, said seal member limiting a leakage of fluids through the seal apparatus. 3. The seal apparatus of claim 2, wherein said seal member comprises a flexible portion and a rigid portion and includes at least one point of contact with said transition seal structure and said seal member includes at least one point of contact with said vane seal structure. 4. The seal apparatus of claim 3, wherein said seal member comprises at least three total points of contact with said transition seal structure and said vane seal structure, said at least three total points of contact separated by points of non-contact, wherein at least one of said at least three total points of contact comprises contact with one of said lip members. 5. The seal apparatus of claim 1, wherein said vane seal structure includes a rim member that extends from said first vane lip member toward a hot gas path to shield the vane structure from hot working gases in the hot gas path. 6. The seal apparatus of claim 1, wherein the transition duct comprises a first radially facing surface that faces a centerline of the transition duct and said transition seal structure comprises a second radially facing surface that faces the centerline of the transition duct, said second radially facing surface of said transition seal structure located radially further from the centerline of the transition duct than said first radially facing surface of the transition duct. 7. The seal apparatus of claim 6, wherein said vane seal structure comprises a third radially facing surface that faces the centerline of the transition duct, said third radially facing surface of said vane seal structure located radially further from the duct. 8. The seal apparatus of claim 1, wherein one of: both said first and second vane lip members are located in said transition channel; andboth said first and second transition lip members are located in said vane channel. 9. The seal apparatus of claim 8, wherein one of: said transition channel defines a first transition passage between said first transition lip member and said first vane lip member and said transition channel defines a second transition passage between said second transition lip member and said second vane lip member, said first and second transition passages at least partially defining said labyrinth path; andsaid vane channel defines a first vane passage between said first vane lip member and said first transition lip member and said vane channel defines a second vane passage between said second vane lip member and said second transition lip member, said first and second vane passages at least partially defining said labyrinth path. 10. The seal apparatus of claim 1, wherein one of: said first vane lip member is received in said transition channel and said second transition lip member is received in said vane channel; andsaid first transition lip member is received in said vane channel and said second vane lip member is received in said transition channel. 11. The seal apparatus of claim 10, wherein one of: said transition channel defines a first transition passage between said first transition lip member and said first vane lip member and said vane channel defines a first vane passage between said second transition lip member and said second vane lip member, said first transition passage and said first vane passage at least partially defining said labyrinth path; andsaid vane channel defines a first vane passage between said first vane lip member and said first transition lip member and said transition channel defines a first transition passage between said second vane lip member and said second transition lip member, said first vane passage and said first transition passage at least partially defining said labyrinth path. 12. The seal apparatus of claim 11, wherein a portion of said transition channel that does not include said first transition passage and a portion of said vane channel that does not include said first vane passage cooperate to define a common channel that further defines said labyrinth path. 13. The seal apparatus of claim 1, further comprising an auxiliary seal structure associated with one of the transition duct and the vane structure, said auxiliary seal structure comprising: an auxiliary base portion associated with the one of the transition duct and the vane structure, said auxiliary base portion defining a third axially facing surface;a first auxiliary lip member extending axially from said third axially facing surface of said auxiliary base portion; anda second auxiliary lip member radially spaced from said first auxiliary lip member and extending axially from said third axially facing surface of said auxiliary base portion such that an auxiliary channel is defined between said first auxiliary lip member, said second auxiliary lip member, and said auxiliary base portion, wherein: said first auxiliary lip member abuts one of said second transition lip member and said second vane lip member;said first auxiliary lip member is located within one of said transition channel and said vane channel; andsaid auxiliary channel further defines said labyrinth path. 14. The seal apparatus of claim 1, wherein at least one of said first transition lip member, said second transition lip member, said first vane lip member, and said second vane lip member comprises at least one of an abradable coating and a thermal barrier coating. 15. A seal apparatus in a gas turbine engine between a transition duct and a vane structure in a first row vane assembly, said seal apparatus comprising: a transition seal structure associated with the transition duct, said transition seal structure comprising: a transition base portion associated with the transition duct and defining a first axially facing surface;a first transition lip member extending axially from said first axially facing surface; anda second transition lip member radially spaced from said first transition lip member and extending axially from said first axially facing surface;a vane seal structure associated with the vane structure, said vane seal structure comprising: a vane base portion associated with the vane structure and defining a second axially facing surface;a first vane lip member extending axially from said second axially facing surface; anda second vane lip member radially spaced from said first vane lip member and extending axially from said second axially facing surface;a seal member located between said transition seal structure and said vane seal structure, said seal member limiting a leakage of fluids through the seal apparatus; andwherein said first transition lip member overlaps said first vane lip member in an axial direction and said second transition lip member overlaps said second vane lip member in the axial direction. 16. The seal apparatus of claim 15, wherein: a transition channel is defined between said first transition lip member, said second transition lip member, and said transition base portion;a vane channel is defined between said first vane lip member, said second vane lip member, and said vane base portion; andsaid transition and vane channels define a labyrinth path for fluids passing through the seal apparatus. 17. The seal apparatus of claim 16, wherein: said seal member is located in at least one of said transition channel and said vane channel;said seal member comprises at least one point of contact with said transition seal structure; andsaid seal member comprises at least one point of contact with said vane seal structure. 18. The seal apparatus of claim 17, wherein said seal member comprises a rigid portion and a flexible portion and includes at least three total points of contact with said transition seal structure and said vane seal structure. 19. The seal apparatus of claim 15, wherein: the transition duct comprises a first radially facing surface that faces a centerline of the transition duct;said transition seal structure comprises a second radially facing surface that faces said centerline of the transition duct;said vane seal structure comprises a third radially facing surface that faces said centerline of the transition duct;said second radially facing surface of said transition seal structure is located radially further from said centerline of the transition duct than said first radially facing surface of the transition duct; andsaid third radially facing surface of said vane seal structure is located radially further from said centerline of the transition duct than said first radially facing surface of the transition duct. 20. The seal apparatus of claim 15, wherein one of: both said first and second vane lip members are located in said transition channel;both said first and second transition lip members are located in said vane channel;said first vane lip member is received in said transition channel and said second transition lip member is received in said vane channel; andsaid first transition lip member is received in said vane channel and said second vane lip member is received in said transition channel.