Patent ID: 6898937

Claim:
A premix fuel nozzle for use in a gas turbine comprising: a base; a first tube having a first outer diameter, a first inner diameter, and opposing first tube ends, said base fixed to said first tube at one of said first tube ends; a second tube coaxial with said first tube and having a second outer diameter, a second inner diameter, and opposing second tube ends, one of said second tube ends adjacent said base, said second outer diameter smaller than said first inner diameter thereby forming a first annular passage between said first and second tubes; a third tube coaxial with said second tube and having a third outer diameter, a third inner diameter, and opposing third tube ends, one of said third tube ends adjacent said base, said third outer diameter smaller than said second inner diameter thereby forming a second annular passage between said second and third tubes, said third tube having a third passage contained within said third inner diameter; an injector assembly fixed to each of said first and second tubes at said tube ends thereof opposite said base, said injector assembly having a plurality of radially extending fins, each of said fins having an outer surface, an axial length, a radial height, and a circumferential width, a radially extending slot within said fin, a set of first injector holes located in said outer surface of each of said fins and in fluid communication with said slot therein, a set of second injector holes located in said injector assembly such that said second injector holes are in fluid communication with said first passage and located between said base and said fins; a fourth tube coaxial with said third tube and of generally conical shape with a tapered outer surface and a fourth inner diameter, said fourth tube having opposing fourth tube ends, one of said fourth tube ends fixed to said injector assembly opposite said first and second tubes said fourth tube in sealing contact with said third tube at said fourth inner diameter; a cap assembly fixed to an opposing fourth tube end opposite said injector assembly and having fifth outer diameter and a fifth inner diameter, said cap assembly further comprising an effusion plate having a third set of injector holes; wherein each of said slots is in fluid communication with second passage.