Patent ID: 7003961

Claim:
A trapped vortex combustor, said trapped vortex combustor comprising: (a) one or more trapped vortex cavities; (b) an air supply system to supply inlet air; (c) a fuel supply system for the supply of gaseous fuel, said fuel supply system comprising (i) a premix stage wherein fuel from said fuel supply system is mixed with said inlet air to provide a lean pre-mixture upstream of a first one of said one or more trapped vortex cavities; (ii) at least one fuel stage comprising one or more injectors in fluid communication with said fuel supply system, at least one of said one or more injectors configured to inject fuel into a first one of said one or more trapped vortex cavities; (d) said first one of said one or more trapped vortex cavities configured to provide a bulk fluid swirl in a predetermined direction; (e) said at least one of said one or more injectors that is configured to inject fuel into said first one of said one or more trapped vortex cavities oriented to provide a jet from said at least one injector to provide momentum of fuel and burning gases in opposition to said bulk fluid swirl predetermined direction.