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A seal arrangement for a combustor is disclosed. The seal arrangement comprises a seal defining a first aperture, an inner combustor wall defining a second aperture, and an outer combustor wall defining a third aperture. The first and second apertures are arranged in line with each other to receive

A seal arrangement for a combustor is disclosed. The seal arrangement comprises a seal defining a first aperture, an inner combustor wall defining a second aperture, and an outer combustor wall defining a third aperture. The first and second apertures are arranged in line with each other to receive an article therethrough. The seal is arranged between the inner and outer combustor walls.

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We claim: 1. A seal arrangement for a combustor, the seal arrangement comprising a seal defining a first aperture and having a radially outwardly extending flange member, the combustor being defined by an inner annular wall defining a second aperture, and an outer annular wall defining a third aper

We claim: 1. A seal arrangement for a combustor, the seal arrangement comprising a seal defining a first aperture and having a radially outwardly extending flange member, the combustor being defined by an inner annular wall defining a second aperture, and an outer annular wall defining a third aperture, the first, second and third apertures being arranged in line with each other to receive an article therethrough, wherein the seal is secured to the combustor by the flange member being disposed between the inner and outer annular walls. 2. A seal arrangement according to claim 1, wherein the seal engages at least one of the inner and outer walls. 3. A seal arrangement according to claim 1 wherein the seal comprises an outwardly extending flange member to engage the, or each, annular wall. 4. A seal arrangement according to claim 3, wherein the outwardly extending flange member extends radially outwardly. 5. A seal arrangement according to claim 1, wherein holding means to hold the article are provided, the holding means extending through the aperture in the outer annular wall. 6. A seal arrangement according to claim 5, wherein the holding means comprises a guide member to guide the article into said apertures. 7. A seal arrangement according to claim 5, wherein the holding means is conical in configuration. 8. A seal arrangement according to claim 1, wherein the inner wall comprises a plurality of wall members. 9. A seal arrangement according to claim 8, wherein one of the wall members comprises a main portion and a spacer to space the main portion from the outer wall, the spacer extending around the second aperture. 10. A seal arrangement according to claim 1, wherein the inner wall defines cooling means around the second aperture. 11. A seal arrangement according to claim 10, wherein the cooling means comprises a plurality of cooling channels and a cooling fluid supply groove extending around the second aperture, wherein the cooling channels extend from the supply groove. 12. A seal arrangement according to claim 11, wherein the cooling channels comprise a plurality of holes extending through the inner wall. 13. A seal arrangement according to claim 11, wherein the cooling channels comprise a plurality of grooves extending along an outer surface of the inner wall to said second aperture therein. 14. A seal arrangement according to claim 11, wherein at least some of the cooling channels extend inwardly towards the second aperture. 15. A cooling arrangement according to claim 11 wherein at least some of the cooling channels extend at an acute angle to the second aperture. 16. A seal arrangement according to claim 11, wherein the second aperture is generally circular in configuration, at least some of the cooling channels are tangential to the second aperture. 17. A seal arrangement according to claim 11, wherein the cooling channels are arranged to provide an array of channels extending around the second aperture. 18. A sealing arrangement according to claim 17, wherein the array of channels is an annular array and comprises a plurality of rows of cooling channels. 19. A sealing arrangement according to claim 18, wherein one of said rows comprises a plurality of cooling grooves extending along the inner wall. 20. A sealing arrangement according to claim 18, wherein the plurality of rows of cooling channels comprises a plurality of rows of cooling holes extending through the inner wall. 21. A sealing arrangement according to claim 1 wherein the seal defines seal cooling means around the first aperture. 22. A sealing arrangement according to claim 21, wherein the seal cooling means comprises a plurality of seal cooling holes extending through an outwardly extending portion of the seal. 23. A sealing arrangement according to claim 22, wherein the seal cooling means comprises a plurality of seal cooling grooves in the outwardly extending portion, extending along a surface of the seal in contact with the inner wall. 24. A combustion arrangement comprising a combustor having a sealing arrangement as claimed in claim 1. 25. A gas turbine engine incorporating a combustion arrangement as claimed in claim 24. 26. A sealing arrangement according to claim 11 wherein the second aperture is generally circular in configuration, at least some of the cooling channels have a constant tangential component thereto. 27. A sealing arrangement according to claim 11 wherein the second aperture is generally circular in configuration, at least some of the cooling channels have a variable tangential component thereto. 28. A seal arrangement for a combustor, the seal arrangement comprising a seal defining a first aperture, an inner combustor wall defining a second aperture, and an outer combustor wall defining a third aperture, the first, second and third apertures being arranged in line with each other to receive an article therethrough, wherein the seal is arranged between the inner and outer combustor walls and wherein the seal engages both of the inner and outer walls and is secured between said walls by said inner and outer walls. 29. A seal arrangement for a combustor, the seal arrangement comprising a seal defining a first aperture, an inner combustor wall defining a second aperture, and an outer combustor wall defining a third aperture, the first, second and third apertures being arranged in line with each other to receive an article therethrough, wherein the seal is arranged between the inner and outer combustor walls and wherein the inner wall defines cooling means around the second aperture. 30. A seal arrangement according to claim 29, wherein the cooling means comprises a plurality of cooling channels and a cooling fluid supply groove extending around the second aperture, wherein the cooling channels extend from the supply groove. 31. A seal arrangement according to claim 30, wherein the cooling channels comprise a plurality of holes extending through the inner wall. 32. A seal arrangement according to claim 30, wherein the cooling channels comprise a plurality of grooves extending along an outer surface of the inner wall to said second aperture therein. 33. A seal arrangement according to claim 30, wherein at least some of the cooling channels extend inwardly towards the second aperture. 34. A cooling arrangement according to claim 30 wherein at least some of the cooling channels extend at an acute angle to the second aperture. 35. A seal arrangement according to claim 30, wherein the second aperture is generally circular in configuration, at least some of the cooling channels are tangential to the second aperture. 36. A seal arrangement according to claim 30, wherein the cooling channels are arranged to provide an array of channels extending around the second aperture. 37. A sealing arrangement according to claim 36, wherein the array of channels is an annular array and comprises a plurality of rows of cooling channels. 38. A sealing arrangement according to claim 37, wherein one of said rows comprises a plurality of cooling grooves extending along the inner wall. 39. A sealing arrangement according to claim 37, wherein the plurality of rows of cooling channels comprises a plurality of rows of cooling holes extending through the inner wall. 40. A sealing arrangement for a combustor, the seal arrangement comprising a seal defining a first aperture, an inner combustor wall defining a second aperture, and an outer combustor wall defining a third aperture, the first, second and third apertures being arranged in line with each other to receive an article therethrough, wherein the seal is arranged between the inner and outer combustor walls and wherein the seal defines seal cooling means around the first aperture. 41. A sealing arrangement according to claim 40, wherein the seal cooling means comprises a plurality of seal cooling holes extending through an outwardly extending portion of the seal. 42. A sealing arrangement according to claim 41, wherein the seal cooling means comprises a plurality of seal cooling grooves in the outwardly extending portion, extending along a surface of the seal in contact with the inner wall.