Granted Patent B2

US 6,845,621 · App. 10/275,049 · Granted Jan 25, 2005

Abstract

Claims (45)

1. An annular combustor comprising:

a) an annular inner shell having an inner surface and an outer surface;

b) a coaxial annular outer shell having an inner surface and an outer surface;

c) a dome end wall connecting the inner shell and outer shell, wherein the inner shell, the outer shell and the dome end wall define an annular combustion chamber having a chamber width between the inner surface of the outer shell and the outer surface of the inner shell, wherein the chamber extends along a longitudinal axis and has an exit end opposite the dome end wall;

d) a dam positioned between the dome end wall and the exit end and extending radially from at least one of the inner shell and the outer shell, wherein the dam defines a reduced flow area passageway within the combustion chamber, wherein the dam is generally perpendicular to one of the inner shell and the outer shell thereby defining a primary combustion zone between the dam and the dome, a secondary combustion zone adjacent to the dam and a dilution zone between the secondary combustion zone and the exit end of the chamber, and wherein the dam has a plurality of bores extending therethrough.

2. The annular combustor according to claim 1 wherein the dam protrudes radially outwardly from the inner shell.

3. The annular combustor according to claim 1 wherein the bores extend radially through the dam.

4. The annular combustor according to claim 3 wherein the dam has a circumferential face which is angled relative to the longitudinal axis such that the bores provide openings extending toward the exit end of the combustor.

5. The annular combustor according to claim 1 further including a deflector located along a circumferential edge of the dam and angled to direct fluid toward the exit end of the combustor.

6. The annular combustor according to claim 1 wherein the radially extending openings through the dam are spaced apart to provide an interrupted pattern at the face of the dam.

7. The annular combustor according to claim 1 wherein the dam protrudes radially inwardly from the outer shell.

8. The annular combustor according to claim 7 wherein the dam has a plurality of bores extending therethrough to permit fluid communication between the inner surface of the inner shell and the outer surface of the inner shell.

9. The annular combustor according to claim 8 wherein the bores extend radially through the dam.

10. The annular combustor according to claim 9 wherein the dam has an inner face which is angled relative to the longitudinal axis such that the bores provide openings extending toward the exit end of the combustor.

11. The annular combustor according to claim 9 further including a deflector located along a circumferential edge of the dam and angled to direct fluid toward the exit end of the combustor.

12. The annular combustor according to claim 8 wherein the radially extending openings through the dam are spaced apart to provide an interrupted pattern at the face of the dam.

13. The annular combustor according to claim 1 wherein a first dam protrudes radially outwardly from the inner shell and a second dam protrudes radially inwardly from the outer shell.

14. The annular combustor according to claim 13 wherein the dam has a plurality of openings extending therethrough to permit fluid communication between the inner surface of the inner shell and the outer surface of the inner shell.

15. The annular combustor according to claim 14 wherein the bores extend radially through the dam.

16. The annular combustor according to claim 15 wherein the dam has an inner face which is angled relative to the longitudinal axis such that the bores provide openings extending toward the exit end of the combustor.

17. The annular combustor according to claim 9 further including a deflector located along a circumferential edge of the dam and angled to direct fluid toward the exit end of the combustor.

18. The annular combustor according to claim 14 wherein the radially extending bores through the dam are spaced apart to provide an interrupted pattern at the face of the dam.

19. The annular combustor according to claim 1 wherein the dam extends circumferentially about the longitudinal axis.

20. The annular combustor according to claim 1 wherein the dam radially extends from one of the inner shell or the outer shell a distance of less than ½ the chamber width.

21. The annular combustor according to claim 20 wherein the dam radially extends a distance of approximately ⅓ the chamber width.

22. The annular combustor according to claim 1 wherein each dam is an integral part of the shell from which it extends.

23. An annular combustor comprising:

a) an annular inner shell having an inner surface and an outer surface;

b) a coaxial annular outer shell having an inner surface and an outer surface;

c) a dome end wall connecting the inner shell and outer shell, wherein the inner shell, the outer shell and the dome end wall define an annular combustion chamber having a chamber width between the inner surface of the outer shell and the outer surface of the inner shell, wherein the chamber extends along a longitudinal axis and has an exit end opposite the dome end wall;

d) a dam positioned between the dome end wall and the exit end and extending radially from at least one of the inner shell and the outer shell, wherein the dam defines a reduced flow area passageway within the combustion chamber, wherein the dam is generally perpendicular to one of the inner shell and the outer shell thereby defining a primary combustion zone between the dam and the dome, a secondary combustion zone adjacent to the dam and a dilution zone between the secondary combustion zone and the exit end of the chamber, and wherein the dam has a plurality of bores extending therethrough.

e) wherein the combustion chamber has:

i) a primary zone defined by a front portion of the inner shell, a front portion of the outer shell, a front surface of the dam and the inner surface of the dome end wall;

ii) a secondary zone defined by a circumferential surface of the dam and a coaxial portion of one or both of the inner shell or outer shell; and

iii) a dilution zone defined by a rear portion of the inner shell, a rear portion of the outer shell, and downstream adjacent to the secondary zone and exit end of the combustion chamber;

f) means for providing fuel and air or oxygen into the primary zone;

g) means for ignition provided in the primary zone;

h) a plurality of air or oxygen passageways defined in the secondary zone; and

i) a plurality of air or oxygen passageways provided in the dilution zone.

24. An annular combustor comprising:

a) an annular inner shell having an inner surface and an outer surface;

b) a coaxial annular outer shell having an inner surface and an outer surface;

c) a dome end wall connecting the inner shell and outer shell, wherein the inner shell, the outer shell and the dome end wall define an annular combustion chamber having a chamber width between the inner surface of the outer shell and the outer surface of the inner shell, wherein the chamber extends along a longitudinal axis and has an exit end opposite the dome end wall; and

d) a first dam and a second dam positioned between the dome end wall and the exit end, wherein the first dam extends radially from the inner shell and wherein the second dam extends radially from the outer shell to define a reduced flow area passageway within the combustion chamber, wherein each dam has a plurality of bores extending therethrough.

25. The annular combustor according to claim 24 wherein the first dam and second dam are coplanar with one another.

Assignments (6)