US20170370591A1 - Turbine engine combustion assembly - Google Patents
Turbine engine combustion assembly Download PDFInfo
- Publication number
- US20170370591A1 US20170370591A1 US15/543,563 US201615543563A US2017370591A1 US 20170370591 A1 US20170370591 A1 US 20170370591A1 US 201615543563 A US201615543563 A US 201615543563A US 2017370591 A1 US2017370591 A1 US 2017370591A1
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- United States
- Prior art keywords
- injection
- flame tube
- combustion assembly
- injector
- wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/38—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising rotary fuel injection means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/04—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying action being obtained by centrifugal action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/46—Combustion chambers comprising an annular arrangement of several essentially tubular flame tubes within a common annular casing or within individual casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/52—Toroidal combustion chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/35—Combustors or associated equipment
Definitions
- the invention relates to the field of combustion assemblies for turbine engines, and more particularly to devices for injecting fuel into the combustion chamber of these assemblies.
- a turbine engine generally comprises, from upstream to downstream in the gas flow direction, a fan, one or more compressor stages, for example a high-pressure compressor and a low-pressure compressor, a combustion chamber, one or more turbine stages, for example a high-pressure turbine and a low-pressure turbine, and a gas exhaust nozzle.
- FIG. 1 illustrates schematically a longitudinal section view of the combustion assembly 1 of an embodiment of a turbine engine according to the prior art.
- the combustion assembly 1 is in communication upstream (to the left in FIG. 1 ) with a compressor (not shown), which supplies it with air under pressure through a diffuser, and is connected downstream to a distributor which is itself connected to a high-pressure turbine (not shown in the figures).
- the combustion assembly 1 is delimited by annular external casing 2 and internal casing 3 , one extending inside the other along a longitudinal axis X-X′.
- the combustion assembly 1 comprises a “flame tube” or “combustion chamber” 4 which is the gas combustion site.
- the flame tube 4 is positioned between the two casings, external 2 and internal 3 , and is provided with front 5 and rear 6 walls of revolution which extend generally one inside the other around the longitudinal axis X-X′.
- the front 5 and rear 6 walls have a bent annular shape and are connected, upstream, to the inner casing 3 , on either side of a centrifugal injection wheel 7 , and downstream, to the outer casing 2 and to the inner casing 3 respectively.
- This type of flame tube is called “annular” and extends around the longitudinal axis X-X′ of the combustion assembly 1 .
- the front and rear walls 5 and 6 are generally positioned at a distance from the outer and inner casings 2 and 3 , so as to form an annular air supply duct 8 surrounding the flame tube 4 .
- the flame tube 4 comprises several successive zones from upstream to downstream, namely a primary zone 9 wherein the injection wheel 7 leads and an intermediate zone 10 at the bend in the tube, wherein are located several dilution tubes 11 .
- the air penetrates into the flame tube 4 through a plurality of air intake openings 12 provided through the front wall 5 and a plurality of air intake openings 13 provided through the rear wall 6 , this opposite a portion of the primary zone 9 .
- the centrifugal injection tube 7 is mounted on an engine shaft 15 , and is driven in rotation thereby.
- the engine shaft 15 is coaxial with the longitudinal axis X-X′ of the combustion assembly 1 .
- the combustion assembly is also equipped with a plurality of injectors 16 distributed regularly around the engine shaft 15 . These injectors 16 are positioned between the engine shaft 15 and the inner casing 3 which also constitutes the bottom (or “inner side”) of the flame tube 4 (with respect to the longitudinal axis X-X′).
- Each injector 16 is positioned so as to project fuel axially (see arrow i), parallel to the longitudinal axis X-X′, onto the front face 17 of the injection wheel 7 , that is the upstream-oriented face of the combustion assembly 1 .
- the film of fuel which comes into contact with the front face 17 is subjected to centrifugal force and is displaced radially toward the outside of the wheel (see arrow j).
- the annular peripheral edge 18 of the wheel 7 is bored at regular intervals with several radially oriented holes 19 .
- the fuel subjected to centrifugal force passes through the holes 19 and is projected radially relative to the engine shaft 15 into the flame tube 4 (arrow k) and is atomized into very fine droplets, which favors its mixing with the compressed air located there.
- This type of combustion assembly with a centrifugal injection wheel has numerous advantages, particularly for small engines such as helicopter engines. These advantages are the following:
- this type of combustion assembly also has disadvantages connected with the position of the injectors, which are placed below the flame tube in proximity with the engine shaft and therefore toward the interior of the combustion assembly.
- Now turbine engines are employed with increasingly higher temperature rise cycles to reduce their specific fuel consumption, which causes coking (that is solidification) of the fuel. It is therefore necessary to clean more and more frequently the injection system and the numerous labyrinth seals positioned around it so as to avoid failures (such as blocking of the shaft by solidified fuel (“coke”), premature wear of the hot parts due to poor fuel distribution, or failure of the engine to start due to blockage of fuel intake).
- the diameter of the injection wheel is considerable, because it is necessary to leave sufficient space between the engine shaft 15 and the edge of the wheel 7 to place the injectors 16 .
- This injection wheel has considerable mass and is subjected to considerable forces due to the speed of rotation.
- the invention has as its purpose to provide a combustion assembly of the aforementioned type, but which resolves the disadvantages mentioned above.
- the invention has as its purpose to propose a combustion assembly wherein the injector(s) of the flame tube is/are easily disassembled without it being necessary to disassemble the entire turbine engine and remove it from the airframe of the helicopter.
- the invention relates to a turbine engine combustion assembly comprising:
- said injector is positioned through said upstream zone of the front wall or through said upstream wall of the rear wall of the flame tube and in such a manner that its injection opening leads inside this tube opposite to the portion of said injection wheel which is located in said flame tube.
- said injector is positioned through the upstream zone of the front wall of the flame tube, said injection wheel is curved at its perimeter upstream of the combustion assembly, so as to have an annular edge, this annular edge being bored with several radial injection holes and said injector leads into the flame tube opposite the front face of the annular peripheral portion of said injection wheel which is located in the flame tube.
- said injector is positioned through the upstream zone of the rear wall of the flame tube, while the injection wheel is curved at its perimeter downstream of the combustion assembly, so as to have an annular edge, this annular edge being bored with several radial injection holes and said injector leads into the flame tube opposite the rear face of the annular peripheral portion of said injection wheel which is located in the flame tube.
- said injection wheel is solid and has an annular fuel receiving radial face which protrudes into the flame tube and the injector leads into the flame tube opposite this annular fuel receiving face.
- the injector is oriented so as to project fuel tangentially onto said fuel receiving face of the injection wheel.
- the fuel receiving face of the injection wheel prefferably forms an angle ⁇ with the axis of the injection opening of the injector, this angle ⁇ being comprised between 90° and 180°.
- the axis of the injection opening of the injector extends in a plane which includes the axis of the injection wheel and which is perpendicular to the median plane of the wheel perpendicular to the axis of the injection wheel.
- the axis of the injection opening of the injector is not perpendicular to the median plane of the wheel perpendicular to the axis of the injection wheel.
- the invention also relates to a turbine engine comprising a combustion assembly as aforementioned.
- FIG. 1 is a longitudinal section view of a combustion assembly according to one embodiment of the prior art
- FIGS. 2 and 3 are schematic views, in longitudinal section, of two embodiments of a turbine engine combustion assembly conforming to the invention
- FIG. 4 is a schematic view of the combustion assembly, taken along a section plane embodied in line IV-IV of FIG. 3 .
- FIG. 2 is a schematic of a combustion assembly 20 which is simplified with relation to that of FIG. 1 because it shows only the flame tube and the injection assembly.
- the flame tube 21 comprises a bottom 22 (or inner side of the flame tube), a front wall 23 and a rear wall 24 .
- the bottom 22 connects the front wall 23 and the rear wall 24 .
- the flame tube 21 is annular and extends around the longitudinal axis X-X′ of the combustion assembly 20 .
- the bottom 22 is bored with an opening 25 allowing passage of a portion of the injection wheel 26 into the interior of the flame tube 21 .
- the injection wheel 26 protrudes partially into the bottom of the flame tube 21 .
- the front wall 23 has an upstream zone 230 , oriented upstream of the combustion assembly and of the turbine engine (to the left in FIG. 2 ), bored with a plurality of air intake openings 27 , opposite the primary combustion zone 28 of the flame tube.
- the rear wall 24 has an upstream zone 240 , oriented upstream of the combustion assembly and the turbine engine, bored with a plurality of air intake openings 29 opposite the primary combustion zone 28 of the flame tube.
- the injection wheel 26 is driven in rotation by the engine shaft 30 , coaxial with the longitudinal axis X-X′. It has a front face 31 , oriented upstream of the combustion assembly and an opposite rear face 32 oriented downstream.
- This injection wheel 26 is curved at its perimeter so as to define a peripheral annular edge 33 bored, preferably at regular intervals, with holes 34 oriented radially with respect to the longitudinal axis X-X′ of the combustion assembly 20 .
- These holes 34 can be orifices or slots.
- the injection wheel 26 penetrates further inside the flame tube 21 because not only is its annular peripheral edge 33 complete inside, but also an annular peripheral portion 260 of the disk that constitutes the wheel 26 .
- This annular portion 260 is located in the extension of the edge 33 .
- the inner face of the annular edge 33 is thus located at a distance D 1 from the bottom 22 of the flame tube 21 which is, for its part, opposite the engine shaft 30 .
- the combustion assembly also comprises one or more injectors 35 , of which only one is visible in FIG. 2 .
- This injector 35 is connected to a fuel feed tube 36 , itself connected to a fuel source not shown in the figure.
- the injector 35 has an injection opening 37 .
- the injector 35 is positioned so as to pass through the front wall 23 of the flame tube 21 , preferably its upstream zone 230 , through which the air intake openings 27 are provided. In addition, this injector 35 is positioned so that its injection opening 37 leads to the interior of the flame tube 21 .
- the distance Dl is sufficient to allow passage of the fuel jet leaving the injection end 37 of the injector 35 .
- the injection operation is as follows.
- the fuel leaving the injector 35 leaves through the injection opening 37 and is projected against the front face 31 of the portion 260 of the injection wheel 26 , where it forms a fuel film F.
- the fuel film Under the influence of centrifugal force due to the rotation of the injection wheel 26 , the fuel film is displaced toward the perimeter of the wheel and passes through the holes 34 , which has the effect, in contact with the air surrounding the wheel, of pulverizing or atomizing the fuel into very fine droplets G, distributed in the interior of the flame tube 21 .
- the injector 31 is positioned through the front wall 23 of the flame tube facilitates its disassembly.
- its configuration will be adapted so as to provide for its extraction through this front wall 23 .
- the injection wheel 26 has a smaller diameter than that of the prior art shown in FIG. 1 , because the bottom 22 of the flame tube 21 can be positioned nearer the engine shaft 30 . It will be noted in this regard that FIGS. 1 and 2 are not shown at the same scale.
- the injection wheel 26 having a smaller diameter, its mass is smaller than that of a wheel of the prior art and its mechanical strength is also improved as a result.
- the injection wheel bears the reference number 41 . It is driven in rotation by the engine shaft 30 .
- injection wheel 26 differs from the injection wheel 26 in that it is solid, that is it is not bored with injection holes 34 . Its peripheral edge 42 is flared so as to define a circular radial face 43 , preferably flat, for receiving the fuel film F.
- the injector 35 is positioned so that its injection opening 37 is opposite this face 43 .
- the axis of the injection opening 37 forms an angle ⁇ (alpha) with the fuel receiving face 43 .
- This angle ⁇ is advantageously comprised between 90° and 180°. When it is 180°, fuel injection occurs tangentially to the face 43 .
- the axis of the injection opening 37 of an injector 35 extends in a plane P 1 which is both perpendicular to P and including the axis of the engine shaft 30 .
- the plane P 1 corresponds to the plane of the paper of the figure and in FIG. 4 , the plane P 1 is shown by a dotted straight line.
- this axis is referred to as X 1 -X′ 1 .
- the injector 35 is advantageously inserted less deeply into the flame tube 21 than in the embodiment of FIG. 2 , because it is not necessary for its injection opening to reach the zone located below the annular edge 33 of the injection wheel. It is sufficient that the injector allows the projection of fuel onto the face 43 . The disassembly of the injection 35 is thereby facilitated.
- the fuel film F is subjected to the centrifugal force generated by the wheel 41 and is atomized in the form of fuel droplets G.
- This embodiment of the invention makes it possible to have an injection wheel 41 which has a structure with great simplicity and good mechanical endurance because it is not bored with through holes. Its diameter is also smaller than in the prior art because the bottom 22 of the flame tube 21 can be brought closer to the engine shaft 30 . Finally, combustion occurs substantially on only one side of the injection wheel 41 , to the left in FIG. 3 here.
- the injector 35 can be positioned through the rear wall 24 of the flame tube 21 , preferably through its upstream zone 240 .
- the flame tube 21 is made in several portions, assembled using a flange 50 which facilitates disassembly.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
- The invention relates to the field of combustion assemblies for turbine engines, and more particularly to devices for injecting fuel into the combustion chamber of these assemblies.
- A turbine engine generally comprises, from upstream to downstream in the gas flow direction, a fan, one or more compressor stages, for example a high-pressure compressor and a low-pressure compressor, a combustion chamber, one or more turbine stages, for example a high-pressure turbine and a low-pressure turbine, and a gas exhaust nozzle.
- The appended
FIG. 1 illustrates schematically a longitudinal section view of thecombustion assembly 1 of an embodiment of a turbine engine according to the prior art. - The
combustion assembly 1 is in communication upstream (to the left inFIG. 1 ) with a compressor (not shown), which supplies it with air under pressure through a diffuser, and is connected downstream to a distributor which is itself connected to a high-pressure turbine (not shown in the figures). - The
combustion assembly 1 is delimited by annularexternal casing 2 andinternal casing 3, one extending inside the other along a longitudinal axis X-X′. - The
combustion assembly 1 comprises a “flame tube” or “combustion chamber” 4 which is the gas combustion site. - The flame tube 4 is positioned between the two casings, external 2 and internal 3, and is provided with front 5 and rear 6 walls of revolution which extend generally one inside the other around the longitudinal axis X-X′.
- The front 5 and rear 6 walls have a bent annular shape and are connected, upstream, to the
inner casing 3, on either side of a centrifugal injection wheel 7, and downstream, to theouter casing 2 and to theinner casing 3 respectively. - This type of flame tube is called “annular” and extends around the longitudinal axis X-X′ of the
combustion assembly 1. - The front and
rear walls 5 and 6 are generally positioned at a distance from the outer andinner casings air supply duct 8 surrounding the flame tube 4. - The flame tube 4 comprises several successive zones from upstream to downstream, namely a
primary zone 9 wherein the injection wheel 7 leads and anintermediate zone 10 at the bend in the tube, wherein are locatedseveral dilution tubes 11. - The air penetrates into the flame tube 4 through a plurality of
air intake openings 12 provided through the front wall 5 and a plurality ofair intake openings 13 provided through therear wall 6, this opposite a portion of theprimary zone 9. - The centrifugal injection tube 7 is mounted on an
engine shaft 15, and is driven in rotation thereby. Theengine shaft 15 is coaxial with the longitudinal axis X-X′ of thecombustion assembly 1. - The combustion assembly is also equipped with a plurality of
injectors 16 distributed regularly around theengine shaft 15. Theseinjectors 16 are positioned between theengine shaft 15 and theinner casing 3 which also constitutes the bottom (or “inner side”) of the flame tube 4 (with respect to the longitudinal axis X-X′). - Each
injector 16 is positioned so as to project fuel axially (see arrow i), parallel to the longitudinal axis X-X′, onto thefront face 17 of the injection wheel 7, that is the upstream-oriented face of thecombustion assembly 1. - As the injection wheel 7 is driven in rotation, the film of fuel which comes into contact with the
front face 17 is subjected to centrifugal force and is displaced radially toward the outside of the wheel (see arrow j). - The annular
peripheral edge 18 of the wheel 7 is bored at regular intervals with several radially orientedholes 19. - The fuel subjected to centrifugal force passes through the
holes 19 and is projected radially relative to theengine shaft 15 into the flame tube 4 (arrow k) and is atomized into very fine droplets, which favors its mixing with the compressed air located there. - This type of combustion assembly with a centrifugal injection wheel has numerous advantages, particularly for small engines such as helicopter engines. These advantages are the following:
-
- it is not necessary to have a preferred type of injector,
- these injectors are insensitive to the viscosity of the fuel, which is linked to the type of fuel and to the ambient temperature,
- the casing of the turbine has a simple structure with low mass and consequently low cost,
- it is possible to obtain a compromise between nitrogen monoxide (NOx) on the one hand, and emissions of carbon monoxide (CO) and unburned hydrocarbons (HC) on the other hand, which is such that the emissions are among the lowest of all aeronautical combustion systems.
- However, this type of combustion assembly also has disadvantages connected with the position of the injectors, which are placed below the flame tube in proximity with the engine shaft and therefore toward the interior of the combustion assembly. Now turbine engines are employed with increasingly higher temperature rise cycles to reduce their specific fuel consumption, which causes coking (that is solidification) of the fuel. It is therefore necessary to clean more and more frequently the injection system and the numerous labyrinth seals positioned around it so as to avoid failures (such as blocking of the shaft by solidified fuel (“coke”), premature wear of the hot parts due to poor fuel distribution, or failure of the engine to start due to blockage of fuel intake).
- It is then necessary to disassemble a large portion of the turbine engine (and thus to remove the helicopter engine) to be able to have access to the injectors situated in a central location, clean and/or replace them and gain access to the labyrinth seals positioned in proximity to the injection wheel. It is in fact not possible to change the injector when the engine is in place, which leads to additional handling and costs and increases the down-time of the helicopter.
- In addition, in a combustion assembly like that shown in
FIG. 1 , the diameter of the injection wheel is considerable, because it is necessary to leave sufficient space between theengine shaft 15 and the edge of the wheel 7 to place theinjectors 16. The result is that this injection wheel has considerable mass and is subjected to considerable forces due to the speed of rotation. - Document U.S. Pat. No. 4,040,251 describes a combustion assembly of the aforementioned type, wherein the injector and its feed tube are positioned within the thickness of the inner casing and of the bottom of the flame tube. The spraying opening of the injector leads into the opening provided in the bottom for passage of the injection wheel.
- As with the combustion assembly described previously, access to the injector is difficult and its maintenance is therefore complex and costly.
- The invention has as its purpose to provide a combustion assembly of the aforementioned type, but which resolves the disadvantages mentioned above.
- In particular, the invention has as its purpose to propose a combustion assembly wherein the injector(s) of the flame tube is/are easily disassembled without it being necessary to disassemble the entire turbine engine and remove it from the airframe of the helicopter.
- To this end, the invention relates to a turbine engine combustion assembly comprising:
-
- an annular flame tube, comprising a front wall equipped with an upstream zone oriented upstream of the combustion assembly, a rear wall provided with an upstream zone oriented upstream of the combustion assembly and a bottom positioned opposite an engine shaft,
- an injection wheel driven in rotation by said engine shaft coaxial with the longitudinal axis X-X′ of the combustion assembly, said injection wheel protruding partially into the flame tube through its bottom and being configured to centrifugally atomize fuel into the flame tube,
- at least one injector capable of depositing a film of fuel onto said injection wheel.
- In conformity with the invention, said injector is positioned through said upstream zone of the front wall or through said upstream wall of the rear wall of the flame tube and in such a manner that its injection opening leads inside this tube opposite to the portion of said injection wheel which is located in said flame tube.
- Thanks to these features of the invention, it is much easier to disassemble the injectors because it is no longer necessary to have access to an area located between the bottom of the flame tube and the drive shaft of the injection wheel. This disassembly can be carried out on the site where the machine (the helicopter for example) equipped with this combustion assembly is located.
- Advantageously and according to a first variant embodiment, said injector is positioned through the upstream zone of the front wall of the flame tube, said injection wheel is curved at its perimeter upstream of the combustion assembly, so as to have an annular edge, this annular edge being bored with several radial injection holes and said injector leads into the flame tube opposite the front face of the annular peripheral portion of said injection wheel which is located in the flame tube.
- Advantageously and according to another variant embodiment, said injector is positioned through the upstream zone of the rear wall of the flame tube, while the injection wheel is curved at its perimeter downstream of the combustion assembly, so as to have an annular edge, this annular edge being bored with several radial injection holes and said injector leads into the flame tube opposite the rear face of the annular peripheral portion of said injection wheel which is located in the flame tube.
- Advantageously and according to yet another variant embodiment, said injection wheel is solid and has an annular fuel receiving radial face which protrudes into the flame tube and the injector leads into the flame tube opposite this annular fuel receiving face.
- In the preferred case, the injector is oriented so as to project fuel tangentially onto said fuel receiving face of the injection wheel.
- It is also possible for the fuel receiving face of the injection wheel to form an angle α with the axis of the injection opening of the injector, this angle α being comprised between 90° and 180°.
- According to a first variant, in the combustion assembly according to the invention, the axis of the injection opening of the injector extends in a plane which includes the axis of the injection wheel and which is perpendicular to the median plane of the wheel perpendicular to the axis of the injection wheel.
- According to a second variant, in the combustion assembly according to the invention, the axis of the injection opening of the injector is not perpendicular to the median plane of the wheel perpendicular to the axis of the injection wheel.
- The invention also relates to a turbine engine comprising a combustion assembly as aforementioned.
- Other features and advantages of the invention will appear from the description that will now be made of it, with reference to the appended drawings which represent, indicatively but without limitation, different possible embodiments of it.
- In these drawings:
-
FIG. 1 is a longitudinal section view of a combustion assembly according to one embodiment of the prior art, -
FIGS. 2 and 3 are schematic views, in longitudinal section, of two embodiments of a turbine engine combustion assembly conforming to the invention, -
FIG. 4 is a schematic view of the combustion assembly, taken along a section plane embodied in line IV-IV ofFIG. 3 . - A first embodiment of the invention will now be described in connection with
FIG. 2 . - This
FIG. 2 is a schematic of acombustion assembly 20 which is simplified with relation to that ofFIG. 1 because it shows only the flame tube and the injection assembly. - The
flame tube 21 comprises a bottom 22 (or inner side of the flame tube), afront wall 23 and arear wall 24. The bottom 22 connects thefront wall 23 and therear wall 24. - As for the
previous combustion assembly 1, theflame tube 21 is annular and extends around the longitudinal axis X-X′ of thecombustion assembly 20. - The bottom 22 is bored with an
opening 25 allowing passage of a portion of theinjection wheel 26 into the interior of theflame tube 21. In other words, theinjection wheel 26 protrudes partially into the bottom of theflame tube 21. - The
front wall 23 has anupstream zone 230, oriented upstream of the combustion assembly and of the turbine engine (to the left inFIG. 2 ), bored with a plurality ofair intake openings 27, opposite theprimary combustion zone 28 of the flame tube. - Likewise, the
rear wall 24 has anupstream zone 240, oriented upstream of the combustion assembly and the turbine engine, bored with a plurality ofair intake openings 29 opposite theprimary combustion zone 28 of the flame tube. - The
injection wheel 26 is driven in rotation by theengine shaft 30, coaxial with the longitudinal axis X-X′. It has a front face 31, oriented upstream of the combustion assembly and an oppositerear face 32 oriented downstream. - This
injection wheel 26 is curved at its perimeter so as to define a peripheralannular edge 33 bored, preferably at regular intervals, withholes 34 oriented radially with respect to the longitudinal axis X-X′ of thecombustion assembly 20. Theseholes 34 can be orifices or slots. - In comparison with the injection wheel 7 of the prior art (see
FIG. 1 ), it will be noted that here theinjection wheel 26 penetrates further inside theflame tube 21 because not only is its annularperipheral edge 33 complete inside, but also an annular peripheral portion 260 of the disk that constitutes thewheel 26. This annular portion 260 is located in the extension of theedge 33. - The inner face of the
annular edge 33 is thus located at a distance D1 from the bottom 22 of theflame tube 21 which is, for its part, opposite theengine shaft 30. - The combustion assembly also comprises one or
more injectors 35, of which only one is visible inFIG. 2 . - This
injector 35 is connected to afuel feed tube 36, itself connected to a fuel source not shown in the figure. - The
injector 35 has aninjection opening 37. - Unlike the prior art, the
injector 35 is positioned so as to pass through thefront wall 23 of theflame tube 21, preferably itsupstream zone 230, through which theair intake openings 27 are provided. In addition, thisinjector 35 is positioned so that itsinjection opening 37 leads to the interior of theflame tube 21. - To this end, it will be noted that the distance Dl is sufficient to allow passage of the fuel jet leaving the injection end 37 of the
injector 35. - The injection operation is as follows. The fuel leaving the
injector 35 leaves through the injection opening 37 and is projected against the front face 31 of the portion 260 of theinjection wheel 26, where it forms a fuel film F. - Under the influence of centrifugal force due to the rotation of the
injection wheel 26, the fuel film is displaced toward the perimeter of the wheel and passes through theholes 34, which has the effect, in contact with the air surrounding the wheel, of pulverizing or atomizing the fuel into very fine droplets G, distributed in the interior of theflame tube 21. - The fact that the injector 31 is positioned through the
front wall 23 of the flame tube facilitates its disassembly. Preferably, its configuration will be adapted so as to provide for its extraction through thisfront wall 23. - Also advantageously, it will be noted that the
injection wheel 26 has a smaller diameter than that of the prior art shown inFIG. 1 , because the bottom 22 of theflame tube 21 can be positioned nearer theengine shaft 30. It will be noted in this regard thatFIGS. 1 and 2 are not shown at the same scale. - The
injection wheel 26 having a smaller diameter, its mass is smaller than that of a wheel of the prior art and its mechanical strength is also improved as a result. - Another embodiment of the invention will now be described in connection with
FIG. 3 . The same elements bear the same numerical references and will therefore not be described in detail again. - The injection wheel bears the
reference number 41. It is driven in rotation by theengine shaft 30. - It differs from the
injection wheel 26 in that it is solid, that is it is not bored with injection holes 34. Itsperipheral edge 42 is flared so as to define a circularradial face 43, preferably flat, for receiving the fuel film F. - The
injector 35 is positioned so that itsinjection opening 37 is opposite thisface 43. - The axis of the injection opening 37 forms an angle α (alpha) with the
fuel receiving face 43. This angle α is advantageously comprised between 90° and 180°. When it is 180°, fuel injection occurs tangentially to theface 43. - It will also be noted that, in this case, considering the median plane P of the wheel (41) to be perpendicular to the axis of the
engine shaft 30 driving this wheel, then the axis of the injection opening 37 of aninjector 35 extends in a plane P1 which is both perpendicular to P and including the axis of theengine shaft 30. InFIG. 3 , the plane P1 corresponds to the plane of the paper of the figure and inFIG. 4 , the plane P1 is shown by a dotted straight line. - However, it is also possible to orient the axis of the injection opening 37 so that it is not perpendicular to P. In other words, this axis then protrudes or separates from the plane P1 corresponding to the plane of
FIG. 3 . InFIG. 4 , this axis is referred to as X1-X′ 1. - In this embodiment, it will be noted that the
injector 35 is advantageously inserted less deeply into theflame tube 21 than in the embodiment ofFIG. 2 , because it is not necessary for its injection opening to reach the zone located below theannular edge 33 of the injection wheel. It is sufficient that the injector allows the projection of fuel onto theface 43. The disassembly of theinjection 35 is thereby facilitated. - As before, the fuel film F is subjected to the centrifugal force generated by the
wheel 41 and is atomized in the form of fuel droplets G. - This embodiment of the invention makes it possible to have an
injection wheel 41 which has a structure with great simplicity and good mechanical endurance because it is not bored with through holes. Its diameter is also smaller than in the prior art because the bottom 22 of theflame tube 21 can be brought closer to theengine shaft 30. Finally, combustion occurs substantially on only one side of theinjection wheel 41, to the left inFIG. 3 here. - Moreover, it will be noted that variant embodiments of the invention are possible. In particular, the
injector 35 can be positioned through therear wall 24 of theflame tube 21, preferably through itsupstream zone 240. - In this case, and when the
injection wheel 26 is made according to the embodiment ofFIG. 2 , itsannular edge 33 is turned downstream of thecombustion assembly 20 and fuel injection occurs on therear face 32 of the wheel. - When the injector is positioned through the
rear wall 24 and theinjection wheel 41 conforms to the embodiment ofFIG. 3 , then its receivingface 43 is oriented toward therear wall 24. - The different possible inclinations of the axis of the injection opening 37 and the different values of the angle α previously described also apply to this variant embodiment.
- Finally, according to another variant embodiment, it is possible to provide that the
flame tube 21 is made in several portions, assembled using aflange 50 which facilitates disassembly.
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1550314A FR3031767B1 (en) | 2015-01-15 | 2015-01-15 | COMBUSTION ASSEMBLY OF TURBOMACHINE. |
FR1550314 | 2015-01-15 | ||
PCT/FR2016/050047 WO2016113495A1 (en) | 2015-01-15 | 2016-01-12 | Turbine engine combustion assembly |
Publications (1)
Publication Number | Publication Date |
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US20170370591A1 true US20170370591A1 (en) | 2017-12-28 |
Family
ID=53404641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/543,563 Abandoned US20170370591A1 (en) | 2015-01-15 | 2016-01-12 | Turbine engine combustion assembly |
Country Status (9)
Country | Link |
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US (1) | US20170370591A1 (en) |
EP (1) | EP3245452A1 (en) |
JP (1) | JP2018508733A (en) |
KR (1) | KR20170104517A (en) |
CN (1) | CN107208897A (en) |
CA (1) | CA2971988A1 (en) |
FR (1) | FR3031767B1 (en) |
RU (1) | RU2017127312A (en) |
WO (1) | WO2016113495A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE958165C (en) * | 1942-08-28 | 1957-07-11 | Karl Leist Dr Ing | Combustion chamber for continuous combustion |
BE507258A (en) * | 1950-12-02 | |||
US4040251A (en) * | 1975-06-04 | 1977-08-09 | Northern Research And Engineering Corporation | Gas turbine combustion chamber arrangement |
CN86200959U (en) * | 1986-02-21 | 1986-12-03 | 中国人民解放军第五七○六工厂 | Inner combustion type heavy oil burner with double atomization nozzle |
US8776525B2 (en) * | 2009-12-29 | 2014-07-15 | Rolls-Royce North American Technologies, Inc. | Gas turbine engine and combustor |
CN103062797B (en) * | 2013-01-10 | 2014-12-10 | 北京航空航天大学 | Combustor central-cyclone oxygen supplement structure for reliable ignition in high-altitude low-temperature low pressure environment |
CN103411217B (en) * | 2013-08-10 | 2017-02-08 | 东营玺诺石油科技有限公司 | Fuel autoignition burner |
-
2015
- 2015-01-15 FR FR1550314A patent/FR3031767B1/en active Active
-
2016
- 2016-01-12 WO PCT/FR2016/050047 patent/WO2016113495A1/en active Application Filing
- 2016-01-12 JP JP2017537358A patent/JP2018508733A/en active Pending
- 2016-01-12 RU RU2017127312A patent/RU2017127312A/en not_active Application Discontinuation
- 2016-01-12 EP EP16701838.1A patent/EP3245452A1/en not_active Withdrawn
- 2016-01-12 CA CA2971988A patent/CA2971988A1/en not_active Abandoned
- 2016-01-12 CN CN201680005937.5A patent/CN107208897A/en active Pending
- 2016-01-12 KR KR1020177021316A patent/KR20170104517A/en unknown
- 2016-01-12 US US15/543,563 patent/US20170370591A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
CA2971988A1 (en) | 2016-07-21 |
JP2018508733A (en) | 2018-03-29 |
WO2016113495A1 (en) | 2016-07-21 |
EP3245452A1 (en) | 2017-11-22 |
FR3031767B1 (en) | 2018-10-19 |
CN107208897A (en) | 2017-09-26 |
KR20170104517A (en) | 2017-09-15 |
RU2017127312A (en) | 2019-02-20 |
FR3031767A1 (en) | 2016-07-22 |
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