Patent ID: 8661824
Filing Date: 2014-03-04
Classification: F23D,F23R

Abstract:
1. An airblast fuel nozzle assembly comprising a sleeve structure forming an inner-air circuit, an outer-air circuit, a main-fuel-feed circuit, and a pilot-fuel-feed circuit; the inner-air circuit including a central passageway through the sleeve structure extending to a nozzle outlet; the outer-air circuit including an annular passageway radially surrounding the central passageway and extending to the nozzle outlet; the pilot-fuel-feed circuit comprising a channel surrounding the inner-air-circuit central passageway, a prefilming surface surrounding the inner-air-circuit central passageway, and a discharge region with exits configured to convey pilot-feed fuel from the channel against the prefilming surface; the main-fuel-feed circuit, the pilot-fuel-feed circuit, the inner-air circuit and the outer-air circuit being arranged such that flows through the main-fuel-feed circuit and the pilot-fuel-feed circuit merge with flows through the inner-air circuit and the outer-air circuit downstream of the prefilming surface; the pilot-fuel-feed-circuit exits having a combined cross-sectional area that is substantially less than the cross-sectional area of the channel upstream of the discharge region; and the pilot-fuel-feed-circuit and the main-fuel-feed-circuit downstream of the discharge region are separated by and immediately adjacent a sleeve.