초록

A gas turbine engine combustor liner having a plurality of holes defined therein for directing air into the combustion chamber. The plurality of holes provide a greater cooling air flow in regions intermediate each diffuser pipe than in other areas of the combustor liner.

대표청구항 ▼

The invention claimed is: 1. A gas turbine engine combustor housed in a plenum defined at least partially by a casing of the gas turbine engine and supplied with compressed air from a compressor via a plurality of diffuser pipes in fluid flow communication therewith, the combustor comprising a line

The invention claimed is: 1. A gas turbine engine combustor housed in a plenum defined at least partially by a casing of the gas turbine engine and supplied with compressed air from a compressor via a plurality of diffuser pipes in fluid flow communication therewith, the combustor comprising a liner enclosing a combustion chamber therewithin, the liner including a dome portion at a first end thereof and at least one annular liner wall extending from and circumscribing said dome portion, said liner wall having a plurality of holes defined therein to form an annular cooling band extending around said liner wall proximate exits of said diffuser pipes, said annular cooling band extending at least downstream from said exits relative to compressed air flow exiting said diffuser pipes, said plurality of holes within said annular cooling band directing cooling air from the plenum into the combustion chamber, said plurality of holes including a first set of cooling holes disposed within circumferentially spaced apart regions located at least between each of said diffuser pipes and a second set of cooling holes disposed outside said regions, wherein said regions having said first set of cooling holes provide a greater cooling air flow therethrough than similarly sized areas of said combustor liner having said second set of cooling holes therein. 2. The combustor as defined in claim 1, wherein said regions define a substantially rectangular shaped area having a length extending downstream from said exit of said diffuser pipes and a circumferentially extending width, said length being greater said width. 3. The combustor as defined in claim 1, wherein said first set of cooling holes are defined within said regions in a spacing density greater than that of said second set of cooling holes. 4. The combustor as defined in claim 3, wherein axial and circumferential spacing density of said first set of cooling holes within said regions are greater than those of said second set of cooling holes. 5. The combustor as defined in claim 1, wherein each hole of said first set of cooling holes defines a larger cross-sectional opening than that of said second set of cooling holes. 6. The combustor as defined in claim 1, wherein said plurality of holes are effusion cooling holes. 7. The combustor as defined in claim 1, wherein said combustor is an annular reverse flow combustor, and wherein said at least one annular wall comprises an outer and an inner annular wall portion spaced apart such that the dome circumscribed thereby and disposed therebetween is annular, said plurality of holes being located in the outer annular wall portion. 8. The combustor as defined in claim 1, wherein said second set of cooling holes are disposed in areas of said liner wall circumferentially aligned with said exit of said diffuser pipes. 9. A gas turbine engine combustor comprising an annular liner enclosing a combustion chamber, the liner receiving compressed air about an outer surface thereof from a plurality of diffuser pipes in fluid flow communication with a compressor, the liner having means for directing said compressed air into the combustion chamber for cooling, said means being disposed in at least first and second regions of the liner, said first regions being located between exits of said diffuser pipes and which extend downstream from said exits relative to air flow exiting said diffuser pipes, said second regions being located outside said first regions, said means disposed in said first regions providing more cooling air flow into the combustion chamber than said means disposed in said second regions. 10. The combustor as defined in claim 9, wherein said means comprise a plurality of cooling holes, said plurality of holes including first cooling holes disposed within said first regions and second cooling holes disposed within said second regions, wherein said first cooling holes provide a greater cooling air flow therethrough than similarly sized areas of said liner having said second cooling holes therein. 11. The combustor as defined in claim 10, wherein said first cooling holes within said regions are disposed in a spacing density greater than that of said second cooling holes. 12. The combustor as defined in claim 10, wherein each of said first cooling holes defines a larger cross-sectional opening than that of said second cooling holes. 13. The combustor as defined in claim 10, wherein said plurality of holes define an annular cooling band extending around said combustor liner immediately downstream from said exits relative to air flow exiting said diffuser pipes, said annular cooling band having said regions circumferentially spaced throughout, and said second cooling holes being defined within said annular cooling band between each of said first regions. 14. The combustor as defined in claim 13, wherein said second cooling holes are substantially circumferentially aligned with said exits of said diffuser pipes. 15. A gas turbine engine including at least a compressor, a combustor and a turbine in serial flow communication, the compressor including a plurality of diffuser pipes directing compressed air to a plenum surrounding said combustor, the combustor comprising: combustor walls including an inner liner and an outer liner spaced apart to define at least a portion of a combustion chamber therebetween; and a plurality of cooling apertures defined through at least one of said inner and outer liners for delivering said compressed air from said plenum into said combustion chamber, said plurality of cooling apertures defining an annular cooling band extending around said outer liner immediately downstream from each exit of said diffuser pipes relative to flow of said compressed air therethrough, said cooling apertures being disposed in a first spacing density in first regions of said annular cooling band located between each of said exits of said diffuser pipes, said cooling apertures being disposed in a second spacing density in second regions of said annular cooling band located outside said first regions and being substantially aligned with each of said exits of said diffuser pipes, said annular cooling band having said first regions circumferentially spaced throughout and said second regions disposed between each of said first regions, and wherein said first spacing density is greater than said second spacing density. 16. The gas turbine engine as defined in claim 15, wherein said plurality of cooling apertures are defined through said outer liner of said combustor walls. 17. The gas turbine engine as defined in claim 16, wherein said outer liner defines an axial length between an upstream end and a downstream end thereof, said exits of said diffuser pipes being located therebetween. 18. The gas turbine engine as defined in claim 15, wherein said plurality of cooling apertures are effusion cooling holes. 19. The gas turbine engine as defined in claim 15, wherein said first regions define a substantially rectanguler shaped area having a length axially extending downstream from said exits of said diffuser pipes and a circumferentially extending width, said length being greater said width. 20. The gas turbine engine as defined in claim 15, wherein said combustor is an annular reverse flow combustor, wherein said inner liner and said outer liner are radially spaced apart such that an upstream dome portion of the combustor which is circumscribed thereby and disposed therebetween is annular, said plurality of cooling apertures are defined through said outer liner.