US 2019/0170355 A1Published application

Fuel injector

AssigneeROLLS-ROYCE plc

InventorsLuca TENTORIO, Hua Wei HUANG, Carl MULDAL, Juan Carlos ROMAN CASADO

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Abstract

A lean burn fuel injector comprises a fuel feed arm and a fuel injector head. The fuel feed arm has a single pilot fuel supply passage and a single main fuel supply passage extending there-through. The fuel injector head has a coaxial arrangement of an inner pilot air-blast fuel injector and a coaxially arranged outer main air-blast fuel injector. The inner pilot air-blast fuel injector comprises a coaxial arrangement of a pilot inner air swirler passage and a pilot outer air swirler passage. The outer main air-blast fuel injector comprises a coaxial arrangement of a main inner air swirler passage and a main outer air swirler passage. The single main fuel supply passage is arranged to supply main fuel to the main inner air swirler passage. The single pilot fuel supply passage is arranged to supply pilot fuel onto the pre-filming surfaces in the pilot inner and outer air swirler passages.

Claims25

Dependent claims

A fuel injector comprising a fuel feed arm and a fuel injector head,

the fuel feed arm having a fuel supply passage extending there-through,
the fuel injector head having an air-blast fuel injector, the air-blast fuel injector comprising, in order radially outwardly, a coaxial arrangement of an inner air swirler passage and an outer air swirler passage, the inner air swirler passage and the outer air swirler passage being arranged immediately adjacent each other,
an annular member defining the radially outer extremity of the outer air swirler passage, a downstream end of the annular member defining the radially outer extremity of the outer air swirler passage being frustoconical, the downstream end of the annular member defining the radially outer extremity of the outer air swirler passage being convergent in a downstream direction,
the fuel supply passage being arranged to supply a first portion of the fuel into the inner air swirler passage and to supply a second portion of the fuel into the outer air swirler passage, the inner air swirler passage having a pre-filming surface, the outer air swirler passage having a pre-filming surface, the fuel supply passage being arranged to supply fuel onto the pre-filming surface in the inner air swirler passage, the fuel supply passage being arranged to supply fuel onto the pre-filming surface in the outer air swirler passage.

1 more element

A method of operating a fuel injector, the fuel injector comprising a fuel feed arm and a fuel injector head,

the fuel feed arm having a fuel supply passage extending there-through,
the fuel injector head having an air-blast fuel injector, the air-blast fuel injector comprising, in order radially outwardly, a coaxial arrangement of an inner air swirler passage and an outer air swirler passage, the inner air swirler passage and the outer air swirler passage being arranged immediately adjacent each other,
an annular member defining he radially outer extremity of the outer air swirler passage, a downstream end of the annular member defining the radially outer extremity of the outer air swirler passage being frustoconical, the downstream end of the annular member defining the radially outer extremity of the outer air swirler passage being convergent in a downstream direction,
the fuel supply passage being arranged to supply a first portion of the fuel into the inner air swirler passage and to supply a second portion of the fuel into the outer air swirler passage, the inner air swirler passage having a pre-filming surface, the outer air swirler passage having a pre-filming surface,
the method comprising supplying a first portion of the fuel to the pre-filming surface in the inner air swirler passage and supplying a second portion of the fuel to the pre-filming surface in the outer air swirler passage.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/188,352Filed 13 Nov 2018
Priority: GB 1720167.44 Dec 2017
Published: 6 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F23R 3/14
Inducing a vortex: by using swirl vanes
F23D 11/107
Medium and fuel meeting at the burner outlet: at least one of both being subjected to a swirling motion
F23R 3/28
Continuous combustion chambers using liquid or gaseous fuel: characterised by the fuel supply
F23R 3/286
Characterised by the fuel supply: having fuel-air premixing devices

Family

No related US applications are recorded in the indexed filing history.

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