F23R - Definition 
Definition statement
This subclass covers:
Combustion chambers that are specially adapted for generation of gaseous combustion products of high pressure or high velocity, and therefore suitable for use as a source of motive power rather than merely a source of heat. Examples of such special adaptations are:
- Specialised configuration in order to be incorporated in a power plant, for example as a combustion chamber between the compressor stage and the turbine stage of a gas turbine plant, or as an afterburner in a jet engine;
- Specialised construction for tolerating high temperatures, for example film cooling or diffusion cooling;
- Specialised arrangements for supplying combustion air, cooling air or dilution air;
- Specialised arrangements for fuel injection.
Methods of combustion in combustion chambers that are specially adapted for generation of combustion products of high pressure or high velocity.
Relationship between large subject matter areas
This subclass is to be seen as an application place in relation to the function-oriented aspects covered by other subclasses of F23. If a method or apparatus is of general interest for combustion it should be classified in other subclasses of F23, for example subclasses F23C(Methods or apparatus for combustion using fluent fuel) and F23D(Burners). If a detail is of general interest for combustion apparatus it should also be classified in other subclasses of F23, for example subclasses F23K(Feeding fuel to combustion apparatus) or F23N(Regulating or controlling combustion). It is sometimes difficult to decide whether an apparatus or a detail is specially adapted or not. In doubtful situations classification should therefore be made in both this subclass and other subclasses of F23.
This subclass covers the configuration of single combustion chambers or flame tubes, or the mutual (for example annular) arrangement of several combustion chambers or flame tubes. The incorporation or arrangement of combustion chambers within a power plant is classified in the place for the power plant as a whole, for example in subclasses F02C(Gas-turbine plants) or F02K(Jet-propulsion plants).
When the control of the combustion is integrated in the control system of an entire power plant it is classified in the place for the control system as a whole, for example in groups F02C 9/00 or F02K 3/08.
References relevant to classification in this subclass
This subclass does not cover:
Fluidised bed combustion chambers specially adapted for operation at superatmospheric pressures | F23C 10/16 |
Combined gas-turbine and steam-turbine plants | F01K 23/00 |
Gas-turbine plants | F02C |
e.g. | F02C 3/14, F02C 5/02 |
Combustion-product positive-displacement engine plants | F02G |
Jet-propulsion plants | F02K |
e.g. | F02K 3/10 |
Combustion chambers for rocket engine plants, i.e. plants carrying both fuel and oxidant therefor | F02K 9/00 |
Starting of engines by supplying pressure fluid generated directly by combustion | F02N 9/02 |
Informative references
Attention is drawn to the following places, which may be of interest for search:
Generation of pressure gas by chemical means | C06D 5/00 |
Gas turbines | F01D |
Combustion chambers for internal-combustion engines, combustion in internal-combustion engines | F02B |
Cooling of gas turbine plants | F02C 7/12 |
Mounting or supporting of gas turbine plants, accommodating heat expansion or creep in gas turbine plants | F02C 7/20 |
Arrangement of seals in gas turbine plants | F02C 7/28 |
Cylinders for combustion engines | F02F 1/00 |
Supplying combustion engines in general with combustible mixtures or constituents thereof | F02M |
Steam generation using combustion under pressure substantially exceeding atmospheric pressure | F22B 1/22 |
Methods or apparatus for combustion using fluent fuel in general | F23C |
Air supply to combustion chambers in general | F23C 7/00, F23L |
Burners in general | F23D |
Feeding fuel to combustion apparatus in general | F23K |
Details of combustion chambers in general | F23M |
e.g. walls | F23M 5/00 |
Regulating or controlling combustion in general | F23N |
Igniting | F23Q |
Glossary of terms
In this subclass, the following terms or expressions are used with the meaning indicated:
| Flame tube | The portion of a combustion chamber downstream of the zone where fuel and primary air are mixed. |