A fuel nozzle assembly includes a centerbody and a cartridge that extends axially through the centerbody. The cartridge defines a purge air passage within the centerbody. The cartridge includes a tip portion that is defined by a tip body. The tip body defines a throat portion and a mouth portion which is defined downstream from the throat portion. The tip body further defines a plurality of injection ports circumferentially spaced around the throat portion. The injection ports provide for fluid communication between the purge air passage and the throat portion of the tip body.