Helmholtz damper system for combustor of gas turbine system and related combustor and fuel nozzle assembly
A Helmholtz damper system includes damper element(s) that include a tube positioned in a hollow mount in a cap assembly of a combustor. The hollow mount has an aft end in fluid communication with a combustion chamber. The tube has a hollow body having an aft end in fluid communication with the combustion chamber, a forward end, and a volume therein. A damping volume control member is coupled to the tube and has a perforated member positioned to at least partially define a damping volume. The damping volume may be defined between the perforated member and another perforated member at the aft end of the tube or just within the control member. The damping volume controls a frequency dampened by the damper element and can be adjusted to the exact frequency requiring damping by adjusting the control member size and/or shape.
1 . A Helmholtz damper system for a combustor of a gas turbine system, the Helmholtz damper system comprising:
at least one damper element in a cap assembly of the combustor, each damper element including:
a tube configured to be positioned in a hollow mount in a cap assembly of the combustor, wherein the hollow mount has a mount aft end in fluid communication with a combustion chamber of the combustor and a mount forward end opposing the mount aft end, wherein the tube has a hollow body having an aft end having a first perforated member in fluid communication with the combustion chamber, a forward end opposite the aft end, and a volume between the aft end and the forward end; and
a damping volume control member coupled to the tube and having a second perforated member positioned to selectively define a damping volume from the volume of the tube, the damping volume defined between the second perforated member and the aft end of the hollow body of the tube, wherein the damping volume controls a frequency dampened by the respective damper element,
wherein the damping volume control member includes a tubular insert configured to be positioned in the forward end of the tube to define the damping volume by reducing the volume of the tube and to increase a damping frequency of the respective damper element, wherein the second perforated member is disposed between the forward and aft ends of the tube.
2 . The Helmholtz damper system of claim 1 , wherein the tube has a perforated divider member between the aft end and the forward end dividing the damping volume into a forward damping volume between the second perforated member of the damping volume control member and the perforated divider member and an aft damping volume between the perforated divider member and the first perforated member of the tube.
3 . The Helmholtz damper system of claim 1 , wherein at least a portion of the tubular insert and at least a portion of the forward end of the tube have mating threaded surfaces, wherein the tubular insert is threadedly connected in at least the forward end of the tube.
4 . The Helmholtz damper system of claim 1 , wherein the damping volume control member includes an externally threaded surface configured to threadedly connect in an internally threaded surface in the tube.
5 . The Helmholtz damper system of claim 4 , wherein the forward end of the tube is aft of the forward end of the hollow mount.
6 . The Helmholtz damper system of claim 1 , further comprising a damping weight positioned in the aft end of the tube.
7 . The Helmholtz damper system of claim 1 , wherein the second perforated member of the damping volume control member fluidly couples the damping volume and an air plenum defined forward of the cap assembly.
8 . The Helmholtz damper system of claim 1 , wherein the tube includes an external positioning member between the aft end and the forward end thereof, the external positioning member interacting with the forward end of the hollow mount to position the tube relative to the hollow mount.
9 . The Helmholtz damper system of claim 1 , further comprising a plurality of cooling passages defined at least partially longitudinally in the tube, each cooling passage having an inlet in fluid communication with an air plenum defined forward of the cap assembly and an outlet in fluid communication with the combustion chamber.
10 . The Helmholtz damper system of claim 9 , wherein at least one of the plurality of cooling passages includes a length extending radially inward toward a center of the tube, and wherein the tubular insert includes a recess in an exterior surface thereof to receive the length of the at least one of the plurality of cooling passages.
11 . The Helmholtz damper system of claim 9 , wherein the outlet of each cooling passage is directed radially outwardly from the tube.
12 . The Helmholtz damper system of claim 1 , wherein the damping volume control member is additively manufactured.
13 . The Helmholtz damper system of claim 1 , wherein the damping volume control member is removably fastened to at least the tube with at least one of a threaded fastener, a threaded joint, a weld, a twist-lock mechanism, or a pinned connection.
14 . The Helmholtz damper system of claim 1 , wherein the tube is removably fastened to the hollow mount with at least one of a threaded fastener, a threaded joint, a weld, a twist-lock mechanism, or a pinned connection.
15 . A fuel nozzle assembly including the Helmholtz damper system of claim 1 , wherein the cap assembly includes a plurality of premixing tubes positioned adjacent the hollow mount of the at least one damper element.
16 . A combustor including the fuel nozzle assembly of claim 15 and the combustion chamber downstream of the fuel nozzle assembly.
17 . A Helmholtz damper system for a combustor of a gas turbine system, the Helmholtz damper system comprising:
at least one damper element in a cap assembly of the combustor, each damper element including:
a tube configured to be positioned in a hollow mount in a cap assembly of the combustor, wherein the hollow mount has an aft end in fluid communication with a combustion chamber of the combustor and a forward end opposing the aft end, wherein the tube has a hollow body having an aft end in fluid communication with the combustion chamber, a forward end opposite the aft end, and a volume between the aft end and the forward end; and
a damping volume control member having a tubular body coupled to and extending at least a length of the tube, the damping volume control member further having a first perforated member positioned at an aft end of the tubular body and within the tube and a second perforated member positioned forward of the first perforated member to selectively define a damping volume between the first and second perforated members, wherein the damping volume controls a frequency dampened by the respective damper element.
18 . The Helmholtz damper system of claim 17 , wherein the second perforated member is positioned aft of the forward end of the tube, and the damping volume is between the forward and aft ends of the tube.
19 . The Helmholtz damper system of claim 17 , wherein the second perforated member is positioned forward of the forward end of the tube, and the damping volume is partially between the forward and aft ends of the tube and partially forward of the forward end of the tube.
20 . A fuel nozzle assembly including the Helmholtz damper system of claim 17 , wherein the cap assembly includes a plurality of premixing tubes positioned adjacent the hollow mount of the at least one damper element.
21 . A combustor including the fuel nozzle assembly of claim 20 , and the combustion chamber downstream of the fuel nozzle assembly.
22 . A Helmholtz damper system for a combustor of a gas turbine system, the Helmholtz damper system comprising:
at least one damper element in a cap assembly of the combustor, each damper element including:
a tube configured to be positioned in a hollow mount in the cap assembly of the combustor, wherein the hollow mount has a mount aft end in fluid communication with a combustion chamber of the combustor and a mount forward end opposing the mount aft end, wherein the tube has a hollow body having an aft end having a first perforated member in fluid communication with the combustion chamber, a forward end opposite the aft end, and a volume between the aft end and the forward end; and
a damping volume control member coupled to the tube and having a second perforated member positioned to selectively define a damping volume from the volume of the tube, the damping volume defined between the second perforated member and the aft end of the hollow body of the tube, wherein the damping volume controls a frequency dampened by the respective damper element,
wherein the damping volume control member includes a volume enlarging member configured to be positioned at the forward end of the tube to define the damping volume by increasing the volume of the tube and to decrease a damping frequency of the respective damper element, wherein the second perforated member is disposed forward of the forward end of the tube.
23 . The Helmholtz damper system of claim 22 , further comprising a plurality of cooling passages defined at least partially longitudinally in the tube, each cooling passage having an inlet in fluid communication with an air plenum defined forward of the cap assembly and an outlet in fluid communication with the combustion chamber.
24 . The Helmholtz damper system of claim 23 , wherein the first perforated member of the tube includes a plurality of cooling members extending from an inner surface toward a center of the tube at the aft end thereof, each cooling member including a portion of a respective cooling passage defined therein and the outlet of the respective cooling passage directed into the combustion chamber.