GAS GENERATOR

A gas generator (GG includes an injector (1) for injecting a fuel and an oxidizer; and a combustor (2) for mixing and burning the fuel and the oxidizer injected from the injector (1), and for supplying a combustion gas of the fuel and the oxidizer as the driving fluid to the turbine of the turbopump. The injector (1) includes a plurality of injection elements (11) arranged on a same plane (10a). Each of the injection elements (11) includes one or more fuel injection nozzles (15) for combustion and one or more oxidizer injection nozzles (13) for combustion, which mix and burn each jet of the fuel and the oxidizer at a combustion point (CP) in front of the plane (10a) in the combustor (2), and one or more injection nozzles (17) for dilution, each mixing an oxidizer for dilution injected toward a dilution point (DP) located forward further than the combustion point (CP) and in front of the plane (10a) in the combustor (2), with a combustion gas generated at the combustion point (CP).