Methods and apparatus for decreasing combustor emissions with swirl stabilized mixer

摘要

A combustor (30) for a gas turbine engine operates with high combustion efficiency, and low carbon monoxide and nitrous oxide emissions during low, intermediate, and high engine power operations. The combustor includes a fuel delivery system (160) that includes at least two fuel stages, at least one trapped vortex cavity (70), and at least one mixer assembly (96) radially inward from the trapped vortex cavity. The two fuel stages include a pilot fuel circuit (162) that supplies fuel to the trapped vortex cavity through a fuel injector assembly (90) and a main fuel circuit (164) that also supplies fuel to the mixer assembly with the fuel injector assembly.