Combustor and gas turbine equipped with the same

A combustor comprising:

• a combustion tube which has a tubular shape around an axis and is able to burn fuel;
• a primary fuel nozzle which is able to inject a primary fuel in a direction toward a distal end of the combustion tube in an axial direction along the axis, inside the combustion tube;
• a secondary fuel nozzle which is attached to the combustion tube at a position closer to the distal end of the combustion tube than the primary fuel nozzle and is able to inject a secondary fuel in a radially inner direction with respect to the axis, inside the combustion tube;
• a fuel manifold which is disposed external to the combustion tube, has an annular shape with respect to the axis, and defines a fuel space which is able to temporarily store the secondary fuel and is in communication with the secondary fuel nozzle;
• a support which supports the fuel manifold with a gap extending radially from the combustion tube;
• a first acoustic attenuator;
• and
• a second acoustic attenuator,
• wherein:
• the support has a support plate which is separated from the combustion tube by the gap and spreads in a circumferential direction with respect to the axis, and a support leg which is attached to the combustion tube and supports the support plate to define the gap between the support plate and the combustion tube;
• the fuel manifold is disposed on a radially outer side of the support plate and is supported by the support;
• the first acoustic attenuator has a first acoustic cover that defines a first acoustic space along an outer surface of the combustion tube;
• the first acoustic cover has a first top plate that extends in the circumferential direction, is spaced radially apart from the combustion tube, and defines an edge of a radially outer side of the first acoustic space, and a first side peripheral plate that extends in the circumferential direction, connects an end of the first top plate in the axial direction and the combustion tube, and defines an edge of the first acoustic space in the axial direction;
• the support plate is made up of the first top plate;
• the support leg is made up of the first side peripheral plate;
• and
• the second acoustic attenuator is disposed on a radially outer side of the first acoustic attenuator.