# US 8,784,051 B2 · Strut for a gas turbine engine

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- Number: US 8,784,051 B2
- Document ID: US8784051B2
- Status: Granted
- Kind: B2
- Application number: 12/164,565
- Filed: 2008-06-30
- Published: 2009-12-31
- Granted: 2014-07-22
- Earliest claimed: 2008-06-30
- Assignees: Pratt & Whitney Canada Corp.
- Applicants: Remo Marini; Edward Vlasic; Jonathon Peter Findlay
- Inventors: Remo Marini; Edward Vlasic; Jonathon Peter Findlay
- Web page: https://patentgrep.com/patent/US8784051B2

## CPC

- F01D 1/02: with stationary working-fluid guiding means and bladed or like rotor, {e.g. multi-bladed impulse steam turbines}(F01D1/24 takes precedence; without stationary working-fluid guiding means F01D1/18)
- F01D 9/065: {Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids (see also F01D25/16, F01D25/24 and F01D25/26)}
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)

## Abstract

The strut is for use in a gas turbine engine has body, typically having an airfoil shape, having a leading edge and a trailing edge. The leading edge has at least one gas inlet in direct fluid communication with at least one outlet located in the trailing edge through which gas may be redirected from the leading edge to the trailing edge through the strut for injection back into a wake region downstream of the strut.

## Claims

### Claim 1

A gas turbine engine comprising:
an annular gas path defined through the engine;
at least one strut extending generally radially relative to the engine from an inner gas path wall to an outer gas path wall and composed by a peripheral wall enveloping an empty inner space, the strut thereby spanning the gas path, the strut having a leading edge located upstream relative to the annular gas path with a plurality of inlet apertures being radially spaced apart from one another, a trailing edge located downstream relative to the annular gas path with a plurality of outlet apertures being radially spaced apart from one another, the trailing edge being located at a wake effect zone; and
at least one strut gas path defined by at least an internal passageway in the empty inner space of the strut, the passageway extending through the empty inner space of the strut between the leading edge and trailing edge apertures, wherein the strut gas path extends in a substantially unobstructed line between the inlet and outlet apertures and through the empty inner space to converge with the annular gas path in the wake effect zone.

### Claim 2 (depends on 1)

The gas turbine engine of claim 1 wherein the passageway provides a substantially straight line path between the inlet and outlet apertures.

### Claim 3 (depends on 1)

The gas turbine engine of claim 1 wherein the strut has a cross-sectional shape which is substantially airfoil-shaped.

### Claim 4 (depends on 1)

The gas turbine engine of claim 1 wherein the strut spans the gas path downstream of a final outlet of a turbine section.

### Claim 5 (depends on 1)

The gas turbine engine of claim 1 wherein the strut spans the gas path upstream of a combustor section.

### Claim 6 (depends on 1)

The gas turbine engine of claim 1 wherein the gas path is defined through a bypass duct of a turbofan engine.

### Claim 7 (depends on 1)

The gas turbine engine of claim 1 wherein the inlet apertures are located at a leading edge stagnation point of the strut.

### Claim 8 (depends on 1)

The gas turbine engine of claim 1 wherein the strut is in a turbine exhaust case.

### Claim 9 (depends on 8)

The gas turbine engine of claim 8 wherein the strut is a deswirler configured to deswirl the gas path flow prior to the exiting the engine.

### Claim 10

A gas turbine engine comprising:
an annular gas path defined through the engine;
at least one strut extending generally radially relative to the engine from an inner gas path wall to an outer gas path wall, the strut thereby spanning the gas path, the strut having a leading edge located upstream relative to the annular gas path with a plurality of radially spaced-apart inlet apertures and a trailing edge located downstream relative to the annular gas path at a wake effect zone with a plurality of radially spaced-apart outlet apertures, the strut composed of a peripheral wall enveloping a substantially unobstructed and empty space therein; and
at least one strut gas path defined by an open internal passageway in the substantially unobstructed space, the strut gas path extending through the strut fluidly connecting the leading edge and trailing edge apertures to converge with the annular gas path in the wake effect zone.

### Claim 11 (depends on 10)

The gas turbine engine of claim 10 wherein the strut is provided in a turbine exhaust case downstream of a final exit of a turbine section of the engine.

### Claim 12 (depends on 10)

The gas turbine engine of claim 10 wherein the inlet apertures are located at a leading edge stagnation point of the strut.

### Claim 13 (depends on 10)

The gas turbine engine of claim 10 wherein the inlet apertures are sized and configured to ingest air from the gas path.