Dilution air inlets with notched tip and slotted tail for combustor

Patent metadata

Field	Value
Publication number	US-11965653-B2
Application number	US-202117355689-A
Country	US
Kind code	B2
Filing date	Jun 23, 2021
Priority date	Jun 23, 2021
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A combustor for a gas turbine engine has a combustor liner that has a cold surface side and a hot surface side, the liner defining an upstream end and a downstream end, and a dilution opening through the combustor liner. The dilution opening includes a main dilution hole portion having an upstream edge and a downstream edge, a notched portion disposed at the upstream edge and extending upstream from the upstream edge, the notched portion being in fluid communication with the main dilution hole portion, and a slotted portion disposed at the downstream edge and extending downstream of the downstream edge, the slotted portion being in fluid communication with the main dilution hole portion.

First claim

We claim:

1. A combustor for a gas turbine engine, the combustor comprising:
a combustor liner having a cold surface side and a hot surface side, the combustor liner defining an upstream end and a downstream end and defining a combustion chamber on the hot surface side;
a bypass oxidizer flow passage on the cold surface side of the combustor liner, the bypass oxidizer flow passage being defined between the cold surface side of the combustor liner and an outer casing of the combustor, the bypass oxidizer flow passage supplying a flow of oxidizer therethrough from the upstream end of the combustor liner to the downstream end of the combustor liner; and
a dilution opening through the combustor liner, the dilution opening comprising:
a cylindrical main dilution hole portion having an upstream edge and a downstream edge, a centerline axis extending through a centerpoint of the cylindrical main dilution hole portion;
a notched portion disposed at the upstream edge and extending upstream from the upstream edge, the notched portion being in fluid communication with the main dilution hole portion, and the notched portion, in a plan view of the cold surface side of the combustor liner, defining a V-shaped notch with an apex thereof arranged upstream of the upstream edge and the apex being arranged on the centerline axis, a width of a base of the V-shaped notch, with respect to the centerline axis at an intersection of the base with the upstream edge on the cold surface side of the combustor liner being less than a diameter of the cylindrical main dilution hole portion; and
a slotted portion disposed at the downstream edge and extending downstream of the downstream edge, the slotted portion being in fluid communication with the main dilution hole portion, and the slotted portion, in the plan view of the cold surface side of the combustor liner, defining a generally rectangular shape with a curved downstream end.

2. The combustor according to claim 1 , wherein the cylindrical main dilution hole portion extends through the combustor liner from the cold surface side to the hot surface side, and
wherein the notched portion extends partially through the combustor liner from the cold surface side.

3. The combustor according to claim 2 , wherein the notched portion extends partially through the combustor liner at a slant angle from the apex at the cold surface side to a junction with the cylindrical main dilution hole portion.

4. The combustor according to claim 1 , wherein a first intersection of the notched portion and the cylindrical main dilution hole portion defines a first fillet, and a second intersection of the notched portion and the cylindrical main dilution hole portion defines a second fillet, and
wherein a radius of the first fillet and a radius of the second fillet has a range from 2.5% to 20% of a diameter of the cylindrical main dilution hole portion.

5. The combustor according to claim 3 , wherein the slant angle is an acute angle having a range from five to sixty degrees with respect to a centerline axis of the cylindrical main dilution hole portion.

6. The combustor according to claim 1 , wherein a spread angle of the V-shaped notch has a range from fifteen to ninety degrees.

7. The combustor according to claim 1 ,
wherein a width of the slotted portion has a range from 5% to 40% of the diameter of the cylindrical main dilution hole portion.

8. The combustor according to claim 1 ,
wherein a length of the slotted portion has a range from 10% to 200% of the diameter of the cylindrical main dilution hole portion.

9. The combustor according to claim 1 , wherein a first intersection of the slotted portion and the cylindrical main dilution hole portion defines a first slot fillet, and a second intersection of the slotted portion and the cylindrical main dilution hole portion defines a second slot fillet, and
wherein a radius of the first slot fillet and a radius of the second slot fillet has a range from 2.5% to 20% of the diameter of the cylindrical main dilution hole portion.

10. The combustor according to claim 1 , wherein the slotted portion, in a plan view of the cold surface side, is arranged at an acute angle with respect to a flow axis defined by the upstream end and the downstream end.

11. The combustor according to claim 1 , wherein the slotted portion comprises a plurality of slots, a first slot of the plurality of slots nearest the main dilution hole portion is in fluid communication with the main dilution hole portion, and others of the plurality of slots are separated from the first slot.

12. The combustor according to claim 1 , wherein the slotted portion comprises a plurality of slots each in fluid communication with the main dilution hole portion, and
wherein the plurality of slots is arranged, in a plan view of the cold surface side of the combustor liner, in any one of parallel to one another extending downstream from the downstream edge, and arranged at an angle diverging from one another extending downstream from the downstream edge.

13. The combustor according to claim 1 , wherein at least a portion of a sidewall of the slotted portion, in a downstream looking cross-sectional view, converges toward the hot surface side of the combustor liner.

14. A combustor liner for a combustor of a gas turbine engine, the combustor liner comprising:
a liner having a cold surface side and a hot surface side, the liner defining an upstream end and a downstream end; and
a dilution opening through the liner, the dilution opening comprising:
a cylindrical main dilution hole portion having an upstream edge and a downstream edge, a centerline axis extending through a centerpoint of the cylindrical main dilution hole portion;
a notched portion disposed at the upstream edge and extending upstream from the upstream edge, the notched portion being in fluid communication with the main dilution hole portion, wherein the notched portion defines, in a plan view of the cold surface side of the liner, a V-shaped notch with an apex thereof arranged upstream of the upstream edge and the apex being arranged on the centerline axis, a width of a base of the V-shaped notch, with respect to the centerline axis, at an intersection of the base with the upstream edge on the cold surface side of the liner being less than a diameter of the cylindrical main dilution hole portion; and
a slotted portion disposed at the downstream edge and extending downstream of the downstream edge, the slotted portion being in fluid communication with the main dilution hole portion, and the slotted portion, in the plan view of the cold surface side of the liner, defining a generally rectangular shape with a curved downstream end.

Assignees

• Gen Electric

Inventors

• Chiranthan Ranganatha Narasimha
• Rangrej Rimple
• Singh Saket
• Naik Pradeep
• Boardman Gregory A

Classifications

• F23R3/06 Primary

  Arrangement of apertures along the flame tube · CPC title

• F23R2900/03045

  Convection cooled combustion chamber walls provided with turbolators or means for creating turbulences to increase cooling · CPC title

• F23R3/04 Primary

  Air inlet arrangements · CPC title