# US 9,435,538 B2 · Annular combustion chamber of a gas turbine

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- Number: US 9,435,538 B2
- Document ID: US9435538B2
- Status: Granted
- Kind: B2
- Application number: 13/746,467
- Filed: 2013-01-22
- Published: 2013-08-01
- Granted: 2016-09-06
- Earliest claimed: 2012-01-31
- Assignees: Rolls-Royce Deutschland Ltd & Co KG
- Applicants: Rolls-Royce Deutschland Ltd & Co KG
- Inventors: Carsten Clemen
- Web page: https://patentgrep.com/patent/US9435538B2

## CPC

- F23R 3/28: characterised by the fuel supply (burners F23D)
- F23C 5/00: Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus (F23C1/00, F23C15/00 take precedence)
- F23R 3/50: Combustion chambers comprising an annular flame tube within an annular casing (toroidal combustion chambers F23R3/52)
- 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)
- F23C: METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN {A CARRIER GAS OR} AIR (burners F23D)

## Abstract

The present invention relates to an annular combustion chamber of a gas turbine with—relative to the engine axis—a radially outer combustion chamber wall and a radially inner combustion chamber wall, with the combustion chamber walls forming an annular combustion space, with a combustion chamber head having a plurality of fuel nozzles and air inlet openings, with the respective central axes of the fuel nozzles forming an envelope rotationally symmetrical to the engine axis, the envelope dividing the combustion chamber into an annular and radially outer area and an annular and radially inner area, with the radially outer area and the radially inner area having the same volumes.

## Claims

### Claim 1

An annular combustion chamber of a gas turbine, comprising:
a radially outer combustion chamber wall relative to an engine axis;
a radially inner combustion chamber wall;
an annular combustion space formed between the radially inner and outer combustion chamber walls;
a combustion chamber head including a plurality of fuel nozzles and air inlet openings, with respective central axes of the fuel nozzles forming an envelope rotationally symmetrical to the engine axis, the envelope dividing the combustion chamber into an annular radially outer region and an annular radially inner region, with the annular radially outer region and the annular radially inner region being equal in volume;
wherein, at each position along envelop in an axial direction of the gas turbine, a respective conical section around the combustion chamber is defined, with the respective conical section being centered on the engine axis and perpendicular to each of the central axes of the fuel nozzles, with the annular radially outer region and the annular radially inner region being equal in area in each respective conical section.

### Claim 2 (depends on 1)

The annular combustion chamber of a gas turbine in accordance with claim 1, wherein the respective central axes of the fuel nozzles are inclined relative to the engine axis by an angle.

### Claim 3 (depends on 2)

The annular combustion chamber of a gas turbine in accordance with claim 2, wherein radii of the radially outer and inner combustion chamber walls are defined as follows:
radius of radially inner combustion chamber wall relative to the engine axis at position X along the engine axis:
R
1
⁡
(
x
)
=
R
⁡
(
x
)
2
-
0.5
·
A
⁡
(
x
)
π
radius of radially outer combustion chamber wall relative to the engine axis at position X along the engine axis:
R
A
⁡
(
x
)
=
R
⁡
(
x
)
2
+
0.5
·
A
⁡
(
x
)
π
with:
L=length of the combustion chamber,
X=position along the engine axis, where X=0 at a combustion chamber inlet of the fuel nozzle and X=L at a combustion chamber outlet,
R(x)=radius of a combustion chamber centerline relative to the engine axis at position X along the engine axis,
A(x)=cross-sectional area of the combustion chamber relative to the combustion chamber centerline at position X on the combustion chamber centerline,
α=inclination angle of the respective central axes of the fuel nozzles relative to the engine axis, and with
X1(x)=x−(R1(x)−R(x))·tan α
XA(x)=x−(RA(x)−R(x))·tan α.