Acoustic damper for a gas turbine engine combustor

A combustor for a gas turbine engine disposed between a diffuser outlet downstream of a compressor outlet guide vane stage and a turbine inlet guide vane stage, said combustor comprising:

• an outer casing spaced apart from an inner casing and a combustion chamber therebetween,
• a combustor inlet at the diffuser outlet and a combustor outlet at the turbine inlet,
• an annularly disposed plurality of air/fuel mixture injectors radially disposed between said casings and axially disposed between said combustor inlet and said combustor outlet,
• an annularly disposed plurality of resonating tubes disposed around said combustion chamber,
• each of said tubes comprising;
• a closed end and an open end and a single cavity between said ends,
• a damping plate having a plurality of apertures therethrough disposed across said open end, and
• a means for mounting said tube on the engine so that said damping plate is essentially flush with said outer casing.

A combustor for a gas turbine engine disposed between a diffuser outlet downstream of a compressor outlet guide vane stage and a turbine inlet guide vane stage, said combustor comprising:

• an outer casing spaced apart from an inner casing and a combustion chamber therebetween,
• a combustor inlet at the diffuser outlet and a combustor outlet at the turbine inlet,
• an annularly disposed plurality of air/fuel mixture injectors radially disposed between said casings and axially disposed between said combustor inlet and said combustor outlet,
• an annularly disposed plurality of resonating tubes disposed around said combustion chamber,
• each of said tubes comprising;
• a closed end and an open end and a single cavity between said ends,
• a damping plate having a plurality of apertures therethrough disposed across said open end,
• a means for mounting said tube on the engine so that said damping plate is essentially flush with said outer casing, and
• wherein said annularly disposed plurality of resonating tubes is axially disposed between said plurality air/fuel mixture injectors and said combustor inlet.