Combustor for a gas turbine

A combustor for a gas turbine, the combustor comprising:

• a combustor axis about which is arranged in flow sequence,
• a radial swirler,
• a pre-chamber and
• a combustion chamber,
• wherein the radial swirler comprises:
• a base plate,
• an annular array of swirler vanes, defining swirler slots, arranged around the base plate,
• a main fuel injector for injecting a main fuel and
• a pilot fuel injector for injecting a pilot fuel,
• wherein the combustor further comprises:
• a premixer nozzle located in the combustion chamber, the radial swirler disposed upstream relative to the premixer nozzle and in fluid communication with the pre-chamber, the premixer nozzle comprising:
• a housing,
• an array of tubes within the housing of the premixer nozzle, and
• a first fuel gallery for supplying a first fuel,
• each tube of the array of tubes comprising an inlet, an outlet, a first aperture and a second aperture, wherein the first aperture and the second aperture of each tube of the array of tubes are respectively disposed relatively closer to the inlet than to the outlet, wherein the inlet of each tube of the array of tubes is fluidly connected to receive compressed air from a compressor connected to the gas turbine,
• wherein the first fuel gallery is arranged to supply the first fuel to the first aperture and/or the second aperture of each tube of the array of tubes,
• wherein the premixer nozzle further comprises a second fuel gallery for supplying a second fuel to the second aperture, wherein, in use, a first portion of the compressed air is arranged to pass through the radial swirler to be conveyed directly from the pre-chamber to the combustion chamber, and a second portion of the compressed air is directly conveyed to the premixer nozzle to pass through the tubes of the array of tubes from the inlet to the outlet, wherein the second portion of the compressed air mixes with the first fuel and the second fuel as the second portion of the compressed air travels from the inlet to the outlet of each tube of the array of tubes within the housing of the premixer nozzle.