# US 10,865,714 B2 · Gas turbine engine fuel injector

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- Number: US 10,865,714 B2
- Document ID: US10865714B2
- Status: Granted
- Kind: B2
- Application number: 15/928,700
- Filed: 2018-03-22
- Published: 2019-09-26
- Granted: 2020-12-15
- Earliest claimed: 2018-03-22
- Assignees: Woodward, Inc.
- Applicants: Woodward, Inc.
- Inventors: Mark G. Goeddeke; Michael Stratton
- Web page: https://patentgrep.com/patent/US10865714B2

## CPC

- F02C 7/222: {Fuel flow conduits, e.g. manifolds}
- F16L 11/20: Double-walled hoses
- F16L 11/22: Multi-channel hoses
- F23R 3/283: {Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances}
- F05D 2220/32: in gas turbines
- F23R 2900/00005: Preventing fatigue failures or reducing mechanical stress in gas turbine components
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

The subject matter of this specification can be embodied in, among other things, a fuel injector for a gas turbine engine includes a fuel injector housing, and an elongated fuel tube held in position in said housing by spaced apart joints and including an undulating tube surface along at least a portion of its length between said joints, said undulating tube surface being in contact with another surface disposed in said housing at one or more locations of said undulating tube surface.

## Claims

### Claim 1

A fuel injector for a gas turbine engine, comprising:
a fuel injector housing comprising an internal surface of an outer housing, the outer housing having uniform thickness; and
a first elongated fuel tube affixed to said fuel injector housing by spaced apart joints and including a first undulating tube outer surface along at least a portion of a length of the first elongated fuel tube between said spaced apart joints, said first undulating tube outer surface being in direct contact with the internal surface of the outer housing of said fuel injector housing at one or more undulations of said first undulating tube outer surface between said spaced apart joints, wherein the first undulating tube outer surface comprises one or more of a pseudo-random, sinusoidal, or serpentine shape.

### Claim 2 (depends on 1)

The fuel injector of claim 1 wherein opposite end regions of said first elongated fuel tube are held in position by said spaced apart joints and said first undulating tube outer surface extends from one of said opposite end regions to the other of said opposite end regions.

### Claim 3 (depends on 2)

The fuel injector of claim 2 wherein the opposite end regions of said first elongated fuel tube comprise metallurgically joined joints.

### Claim 4 (depends on 1)

The fuel injector of claim 1 wherein said internal surface comprises an inner surface of a second elongated fuel tube disposed about said first elongated fuel tube in said fuel injector housing.

### Claim 5 (depends on 1)

The fuel injector of claim 1 wherein said first undulating tube outer surface is also in direct contact with an outer surface of a second elongated fuel tube disposed inside said first elongated fuel tube in said fuel injector housing.

### Claim 6 (depends on 1)

The fuel injector of claim 1 wherein said internal surface defines a passage in an injector strut.

### Claim 7 (depends on 1)

The fuel injector of claim 1 wherein said first undulating tube outer surface forms a helical or spiral tube surface.

### Claim 8 (depends on 1)

The fuel injector of claim 1, further comprising a second elongated fuel tube held in position in said fuel injector housing by spaced apart second joints and including a second undulating tube surface along at least a portion of a length of the second elongated fuel tube between said spaced apart second joints, said second undulating tube surface being in contact with said internal surface defined by said fuel injector housing at one or more locations of said second undulating tube surface wherein the second undulating tube surface comprises one or more of another pseudo-random, sinusoidal, or serpentine shape.

### Claim 9 (depends on 8)

The fuel injector of claim 8 wherein said internal surface comprises an inner surface of a second undulating fuel tube disposed about said second elongated fuel tube in said fuel injector housing.