Combustion liner
A liner for a combustor in a gas turbine engine and a related method. The liner includes a liner body having a cold side and a hot side. The liner includes a dilution array having a plurality of dilution passages, each dilution passage of the plurality of dilution passages having a concatenated geometry repeating in a predetermined pattern and extending circumferentially around the liner body. The dilution passage integrates a first dilution air flow flowing through the dilution passage from the cold side to the hot side and a second dilution air flow flowing through the dilution passage from the cold side to the hot side into an integrated dilution air flow and injects the integrated dilution air flow into a core primary combustion zone of the combustor to attain a predetermined combustion state of the combustor. The dilution array is repeated along an axial length of the liner body.
1. A liner for a combustor in a gas turbine engine, the liner comprising:
a liner body having a cold side and a hot side; and
a dilution array comprising a plurality of dilution passages repeating in a predetermined pattern circumferentially around the liner body, each dilution passage of the plurality of dilution passages having a concatenated geometry comprising:
a discrete hole configured to inject a first dilution air flow therethrough from the cold side to the hot side; and
a discrete slot configured to inject a second dilution air flow therethrough from the cold side to the hot side, wherein the discrete hole is located downstream of the discrete slot such that the discrete hole is configured to inject the first dilution air flow downstream of a location at which the discrete slot is configured to inject the second dilution air flow,
wherein the dilution array is configured (i) to integrate the first dilution air flow and the second dilution air flow into an integrated dilution air flow, and (ii) to inject the integrated dilution air flow into a core primary combustion zone of the combustor to attain a predetermined combustion state of the combustor,
wherein the dilution array is repeated along an axial length of the liner body,
wherein the discrete hole has a semi-circular cross section and a centerline extending through a center of a diameter of the semi-circular cross section, and
wherein a forward face of the discrete slot is coextensive with a plane parallel to the forward face and extends through the centerline of the discrete hole.
2. The liner of claim 1 , wherein the first dilution air flow is ten percent to ninety percent of a total flow through the plurality of dilution passages.
3. The liner of claim 1 , wherein the discrete slot has a first slot extension extending circumferentially in a first direction from a first side of the discrete hole and a second slot extension extending circumferentially in a second direction from a second side of the discrete hole, wherein the first direction opposes the second direction.
4. The liner of claim 3 , wherein the first slot extension and the second slot extension are each within a range of 0.5 times to fifteen times a slot width of the discrete slot.
5. The liner of claim 1 , wherein each of the plurality of dilution passages comprises a dilution insert extending radially inward from the hot side of the liner body.
6. The liner of claim 5 , wherein the dilution insert has a constant height from a forward side of the dilution insert to an aft side of the dilution insert.
7. The liner of claim 5 , wherein the dilution insert has a variable height from a forward side of the dilution insert to an aft side of the dilution insert.
8. The liner of claim 5 , wherein the dilution insert has a height within a range of 0.1 times to ten times the diameter of the discrete hole.
9. The liner of claim 5 , wherein the dilution insert has a slant cut along a forward side of the dilution insert.
10. The liner of claim 1 , wherein the predetermined pattern is a linear array.
11. The liner of claim 10 , wherein the linear array comprises the plurality of dilution passages arranged along a common axis around a circumference of the liner body.
12. The liner of claim 1 , wherein the predetermined pattern comprises a staggered array.
13. The liner of claim 12 , wherein the staggered array comprises a first row of the plurality of dilution passages and a second row of the plurality of dilution passages, a centerline of the plurality of dilution passages in the first row being axially offset from a centerline of the plurality of dilution passages in the second row.
14. A liner for a combustor in a gas turbine engine, the liner comprising:
a liner body having a cold side and a hot side; and
a dilution array comprising a plurality of dilution passages repeating in a predetermined pattern circumferentially around the liner body, each dilution passage of the plurality of dilution passages having a concatenated geometry comprising:
a discrete hole having a semi-circular cross section with a centerline extending through a center of a diameter of the semi-circular cross section, the discrete hole configured to inject a first dilution air flow therethrough from the cold side to the hot side; and
a discrete slot configured to inject a second dilution air flow therethrough from the cold side to the hot side, wherein the discrete slot is located downstream of the discrete hole such that the discrete slot is configured to inject the second dilution air flow downstream of a location at which the discrete hole is configured to inject the first dilution air flow and wherein an aft face of the discrete slot is coextensive with a plane parallel to the aft face and extends through the centerline of the discrete hole,
wherein the dilution array is configured (i) to integrate the first dilution air flow and the second dilution air flow into an integrated dilution air flow, and (ii) to inject the integrated dilution air flow into a core primary combustion zone of the combustor to attain a predetermined combustion state of the combustor, and
wherein the dilution array is repeated along an axial length of the liner body.
15. The liner of claim 14 , wherein the second dilution air flow fills a region of wakes formed behind a plurality of discrete jets of the first dilution air flow.
16. The liner of claim 14 , wherein the first dilution air flow is ten percent to ninety percent of a total flow through the plurality of dilution passages.
17. The liner of claim 14 , wherein the discrete slot has a first slot extension extending circumferentially in a first direction from a first side of the discrete hole and a second slot extension extending circumferentially in a second direction from a second side of the discrete hole, wherein the first direction opposes the second direction.
18. The liner of claim 14 , wherein each of the plurality of dilution passages comprises a dilution insert extending radially inward from the hot side of the liner body.
19. The liner of claim 14 , wherein the predetermined pattern is a linear array.
20. The liner of claim 14 , wherein the predetermined pattern comprises a staggered array.