Gas turbine combustor

A gas turbine combustor which combusts fuel with compressed air supplied from a compressor, and supplies a combustion gas to a turbine, the gas turbine combustor comprising:

• a casing coupled to a main housing of the turbine;
• a liner having a configuration in which a combustion chamber extending in an axial direction of the gas turbine combustor is formed inside the liner, an upstream portion including a head portion of the liner is accommodated in the casing, and a downstream portion located downstream of the upstream portion is accommodated in the main housing;
• a main burner provided at the head portion of the liner;
• a supplemental burner including an injection port located between the liner and the casing, the supplemental burner being configured to inject an air-fuel mixture in which supplemental burning fuel containing hydrogen and the compressed air taken into the supplemental burner through a space formed between the liner and the casing are mixed;
• and
• a duct including an entrance connected to the injection port of the supplemental burner and an exit which opens in the combustion chamber, the duct having a structure in which at least a portion of a region extending from the entrance to the exit extends in parallel with the axial direction.