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Embodiments of the invention relate to a combustor flow sleeve for a turbine engine. The flow sleeve can be configured to optimize cooling and airflow distribution. The flow sleeve can include first and second sets of openings. A first set of openings can be provided for impingement cooling the area

Embodiments of the invention relate to a combustor flow sleeve for a turbine engine. The flow sleeve can be configured to optimize cooling and airflow distribution. The flow sleeve can include first and second sets of openings. A first set of openings can be provided for impingement cooling the areas of the liner that are subjected to high thermal loads. The second set of openings can be provided to more evenly distribute the airflow into the combustor head-end. By focusing the cooling on the areas of need and by making the airflow more uniform, embodiments of the invention can reduce the system pressure drop and enhance the performance and power of the engine.

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What is claimed is: 1. A combustor for a turbine engine comprising: a combustor head-end; a liner extending from the head-end; a flow sleeve having an axial upstream end and an axial downstream end, the downstream end of the flow sleeve being secured to the combustor head-end, at least a portion of

What is claimed is: 1. A combustor for a turbine engine comprising: a combustor head-end; a liner extending from the head-end; a flow sleeve having an axial upstream end and an axial downstream end, the downstream end of the flow sleeve being secured to the combustor head-end, at least a portion of the liner extending into the flow sleeve, wherein a substantially annular flow passage to the head-end is defined therebetween, the flow passage having an axial inlet formed between the axial upstream end of the flow sleeve and the liner; wherein the flow sleeve includes a plurality of openings distributed about the flow sleeve in a region defined between the axial downstream end and an axially central location of the flow sleeve, the openings permitting fluid communication between the exterior of the flow sleeve and the flow passage, whereby an uneven distribution of the flow into the head-end through the passage is made substantially uniform. 2. The combustor of claim 1 wherein the plurality of openings are located in an axially central region of the flow sleeve. 3. The combustor of claim 1 wherein each of the plurality of openings is substantially circular. 4. The combustor of claim 1 wherein at least one of the plurality of openings is substantially non-circular. 5. The combustor of claim 1 wherein at least one of the plurality of openings is larger than the other openings. 6. The combustor of claim 1 wherein the plurality of openings are substantially identical. 7. The combustor of claim 1 wherein the plurality of openings are arranged in at least one row about the periphery of the flow sleeve. 8. A combustor for a turbine engine comprising: a combustor head-end; a liner extending from the head-end; and a flow sleeve having an axial upstream end and an axial downstream end, the downstream end of the flow sleeve being secured to the combustor head-end, at least a portion of the liner extending into the flow sleeve, wherein a substantially annular flow passage to the head-end is defined therebetween, the flow passage having an axial inlet formed between the axial upstream end of the flow sleeve and the liner; wherein the flow sleeve includes a first plurality of openings distributed about the flow sleeve in a region defined between the axial upstream end and an axially central location of the flow sleeve, the first plurality of openings permitting fluid communication between the exterior of the flow sleeve and the flow passage, whereby air flowing through the first plurality of openings provides impingement cooling to those portions of the liner directly beneath the first plurality of openings, wherein the flow sleeve includes a second plurality of openings distributed about the flow sleeve in a region defined between the axial downstream end and an axially central location of the flow sleeve, the second plurality of openings permitting fluid communication between the exterior of the flow sleeve and the flow passage, whereby an uneven distribution of the flow into the head-end through the passage is made substantially uniform. 9. The combustor of claim 8 wherein the second plurality of openings are located in an axially central region of the flow sleeve. 10. The combustor of claim 8 wherein each of the second plurality of openings is substantially circular. 11. The combustor of claim 8 wherein at least one of the openings in the second plurality of openings is substantially non-circular. 12. The combustor of claim 8 wherein at least one of the second plurality of openings is larger than the other openings. 13. The combustor of claim 8 wherein the second plurality of openings are substantially identical. 14. The combustor of claim 8 wherein the second plurality of openings are arranged in at least one row about the periphery of the flow sleeve. 15. The combustor of claim 8 wherein the flow passage is substantially sealed upstream of the first set of openings, whereby cross-flow between the air flowing into the first plurality of openings and the air that enters the passage through the upstream end of the flow sleeve is minimized. 16. The combustor of claim 15 wherein the flow passage is substantially sealed by one of a plate, sealing material, piston rings, sprung cloth seals and spring seals. 17. The combustor of claim 8 wherein each of the second plurality of openings is larger than each of the first plurality of openings. 18. The combustor of claim 8 wherein each of the first plurality of openings is substantially circular. 19. The combustor of claim 8 wherein the first plurality of openings are arranged in at least one row about the periphery of the flow sleeve. 20. The combustor of claim 8 wherein the head-end further includes a pilot nozzle and a flame extending therefrom, wherein the flame extends inside of the liner to a flame end, wherein the first plurality of openings are radially superimposed along the axial length of the flow sleeve so as to substantially correspond with the flame end. 21. A combustor for a turbine engine comprising: a liner; and a flow sleeve having an axial upstream end and an axial downstream end, at least a portion of the liner extending into the flow sleeve, wherein a substantially annular flow passage is defined therebetween, wherein the flow sleeve includes a first plurality of openings distributed about the flow sleeve in a region defined between the axial upstream end and an axially central location of the flow sleeve, the first plurality of openings permitting fluid communication between the exterior of the flow sleeve and the flow passage, whereby air flowing through the first plurality of openings provides impingement cooling to those portions of the liner directly beneath the first plurality of openings, wherein the flow sleeve includes a second plurality of openings distributed about the flow sleeve in a region defined between the axial downstream end and an axially central location of the flow sleeve, the second plurality of openings permitting fluid communication between the exterior of the flow sleeve and the flow passage, at least one opening of the second plurality of openings being larger than each opening in the first plurality of openings.