PREMIX FUEL NOZZLE ASSEMBLY

摘要

PROBLEM TO BE SOLVED: To reduce effects of purge air on a pilot flame provided by a pilot premix nozzle.SOLUTION: A pilot premix fuel nozzle assembly includes a premix tip having a plurality of premix tubes that each defines a premix passage and a fuel port. The premix passage of each premix tube is in fluid communication with the pilot air passage. The premix fuel nozzle assembly further includes a purge air cartridge assembly that extends axially within the pilot air passage. The purge air cartridge assembly includes a feed tube portion and a tip portion that define a purge air passage within the pilot air passage. The tip portion comprises an aft wall that extends at least partially through an opening defined by the premix tip. The aft wall includes a single axially extending orifice that is in fluid communication with the purge air passage.SELECTED DRAWING: Figure 1