Airblast fuel nozzle assembly
AssigneeParker-Hannifin Corporation
InventorsRobert R. Pelletier, Michael K. Teter
Life of this patent
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Abstract
An airblast fuel nozzle assembly (10) comprising a sleeve structure having a series of coaxial sleeves forming an inner-air circuit, an outer-air circuit, a main-fuel-feed circuit, and a pilot-fuel-feed circuit. The pilot-fuel-feed circuit includes a channel (44), and a discharge region (45) with exits (46). The exits (46) have a combined cross-sectional area that is substantially less than the cross-sectional area of the channel (44) upstream of the discharge region (45). In this manner, the pilot-fuel-feed circuit itself can provide a relatively large pressure drop across the channel region (44), and thereby assist in self atomization during ignition stages of engine operation.
Claims20
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 and the pilot-fuel-feed circuit merging with 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.
An airblast fuel nozzle assembly comprising a sleeve structure forming an inner-air circuit, an outer-air circuit, and a 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 fuel-feed circuit comprising a channel surrounding the inner-air-circuit central passageway, a prefilming surface surrounding the channel passageway, and a discharge region between the channel and the prefilming surface;
- the discharge region comprising passages extending radially outward in the downstream direction and each passage having a downstream end configured to direct fuel from the channel against the prefilming surface.
Dependencies are inferred from the claim text.