COMBUSTOR

A combustor is configured such that an outer liner defines a combustion chamber configured such that fuel and air are supplied thereto from an upstream end side, the fuel is subjected to combustion, and a combustion gas flows out to a downstream end side, an inner liner extends to be concentric with the outer liner inside the outer liner, a sub burner is defined between the outer liner and the inner liner, a main burner is defined on the downstream end side, the fuel is supplied at an equivalence ratio and is subjected to combustion in the sub burner, and the fuel and the air are supplied to the main burner through a region provided radially inward of the inner liner and are subjected to combustion while being mixed with a burnt gas.