Helmholtz damper system for combustor of gas turbine system and related combustor and fuel nozzle assembly

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.

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.