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US 2007/0163263 A1Published application
System and method for cooling a staged airblast fuel injector
AssigneeGoodrich - Delavan Turbine Fuel Technologies
InventorNeal Thomson
Life of this patent
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Abstract
A staged fuel injector is disclosed that includes a main fuel circuit for delivering fuel to a main fuel atomizer and a pilot fuel circuit for delivering fuel to a pilot fuel atomizer located radially inward of the main fuel atomizer. The pilot fuel circuit is in close proximity to the main fuel circuit enroute to the pilot fuel atomizer so that the pilot fuel flow cools stagnant fuel located within the main fuel circuit during low engine power operation to prevent coking.
Claims19
A staged fuel injector comprising:
- a) a main fuel circuit for delivering fuel to a main fuel atomizer;
- and
- b) a pilot fuel circuit for delivering fuel to a pilot fuel atomizer located radially inward of the main fuel atomizer, wherein the pilot fuel circuit is in thermal contact with the main fuel circuit enroute to the pilot fuel atomizer.
A staged fuel injector comprising:
- a) a main fuel atomizer including a radially outer prefilmer having an outer diametrical surface and a radially inner fuel swirler having an outer diametrical surface;
- b) a main fuel circuit formed in the main fuel atomizer and including an outer main fuel circuit portion formed in the outer diametrical surface of the prefilmer and an inner main fuel circuit portion formed in the outer diametrical surface of the fuel swirler;
- c) a pilot fuel circuit formed in the main fuel atomizer and including an outer pilot fuel circuit portion formed in the outer diametrical surface of the prefilmer and an inner pilot fuel circuit portion formed in the outer diametrical surface of the fuel swirler;
- and
- d) a pilot fuel atomizer axially located within the main fuel atomizer, and communicating with the pilot fuel circuit.
2 more elements
A method of cooling a staged fuel injector comprising:
- a) providing a main fuel circuit for delivering fuel to a main fuel atomizer;
- b) providing a pilot fuel circuit for delivering fuel to a pilot fuel atomizer located radially inward of the main fuel atomizer;
- and
- c) directing fuel through the pilot fuel circuit to cool stagnant fuel located within the main fuel circuit during low engine power operation to prevent coking.
1 more element
Dependencies are inferred from the claim text.