High frequency acoustic damper for combustor liners
AssigneeGeneral Electric Company
InventorsKwanwoo Kim, Changjin Yoon, John Thomas Herbon
Life of this patent
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Abstract
An acoustic damping device is provided that includes a resonating tube defining a resonating cavity with a predetermined characteristic length and a tube end defining a cavity opening, as well as a case configured to reversibly secure the tube end in fluidic communication with a fluid volume enclosed by a liner. The cavity opening is connected with the resonating cavity. The case includes a vented ferrule adpressed over a perforated region of the liner. The vented ferrule defines a ferrule opening that is aligned with the perforated region of the liner and the cavity opening to form the fluidic communication between the fluid volume and the resonating cavity.
Claims20
An acoustic damping device comprising:
- a resonating tube defining a resonating cavity with a predetermined characteristic length, and a tube end defining a cavity opening, said cavity opening connected with said resonating cavity;
- and
- a case configured to reversibly secure said tube end in fluidic communication with a fluid volume enclosed by a liner, said case comprising a vented ferrule adpressed over a perforated region of said liner, said vented ferrule defining a ferrule opening, wherein said perforated region of said liner, said ferrule opening, and said cavity opening are aligned to form said fluidic communication between said fluid volume and said resonating cavity.
A method of damping pressure fluctuations within a fluid volume enclosed by a liner, the method comprising:
- forming a perforated region through the liner, the perforated region comprising a plurality of openings between an outer surface of the liner and an inner surface of the liner adjacent the fluid volume;
- coupling an acoustic damping device to the outer surface aligned with the perforated region, the acoustic damping device comprising a case and a resonating tube including a resonating cavity formed of a predetermined characteristic length and a first end defining a cavity opening;
- adpressing the case to the outer surface over the perforated region, the case comprising a vented ferrule defining a ferrule opening;
- and
- coupling the first end to the case, with the perforated region, the ferrule opening, and the cavity opening aligned to form a fluidic communication between the fluid volume and the resonating chamber.
A gas turbine engine comprising a combustor coupled in flow communication with a compressor, said combustor comprising a combustor liner including at least one plurality of openings in a perforated region, said combustor liner enclosing a combustion zone, said combustor comprising at least one acoustic damping device, each said acoustic damping device attached over each corresponding plurality of openings of said at least one plurality of openings, each acoustic damping device comprising:
- a resonating tube defining a resonating cavity with a predetermined characteristic length, said resonating tube comprising an open tube end;
- and
- a case configured to reversibly secure said open tube end in fluidic communication with said combustion region, said case comprising a vented ferrule adpressed over one perforated region of said combustor liner, said vented ferrule defining a ferrule opening, wherein said one perforated region of said liner, said ferrule opening, and said open tube end are aligned to form said fluidic communication between said combustion zone and said resonating chamber.
Dependencies are inferred from the claim text.