US20140339339A1 - Airblast injectors for multipoint injection and methods of assembly - Google Patents
Airblast injectors for multipoint injection and methods of assembly Download PDFInfo
- Publication number
- US20140339339A1 US20140339339A1 US13/665,568 US201213665568A US2014339339A1 US 20140339339 A1 US20140339339 A1 US 20140339339A1 US 201213665568 A US201213665568 A US 201213665568A US 2014339339 A1 US2014339339 A1 US 2014339339A1
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- Prior art keywords
- fluid
- injector
- fuel
- distributor
- conical surface
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 title claims description 13
- 239000007924 injection Substances 0.000 title claims description 13
- 239000012530 fluid Substances 0.000 claims abstract description 90
- 238000005304 joining Methods 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 claims description 80
- 238000002955 isolation Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 239000000571 coke Substances 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005219 brazing Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- 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
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/106—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting at the burner outlet
- F23D11/107—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting at the burner outlet at least one of both being subjected to a swirling motion
-
- 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
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/11101—Pulverising gas flow impinging on fuel from pre-filming surface, e.g. lip atomizers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49428—Gas and water specific plumbing component making
- Y10T29/49432—Nozzle making
Definitions
- the present invention relates to airblast injection nozzles, and more particularly, to systems and methods for assembling components of airblast injection nozzles for multipoint injection.
- Multipoint lean direct injection for gas turbine engines is well known in the art.
- Multipoint refers to the use of a large number of small airblast injector nozzles to introduce the fuel and air into the combustor.
- By using many very small airblast injector nozzles there is a reduction of the flow to individual nozzles, therein reducing the diameter of the nozzle.
- the volume of recirculation zone downstream of the nozzle is thought to be a controlling parameter for the quantity of NO x produced in a typical combustor.
- a larger nozzle will produce greater fuel flow, but also a greater emission index of NO X (EINO X ).
- conventional construction of small sized injectors, nozzles, atomizers and the like includes components bonding together with braze.
- the components have milled slots or drilled holes to control the flow of fuel and prepare the fuel for atomization.
- the components are typically nested within one another and form a narrow diametric gap which is filled with a braze alloy.
- the braze alloy is applied as a braze paste, wire ring, or as a thin sheet shim on the external surfaces or within pockets inside the assembly. The assembly is then heated and the braze alloy melts and flows into the narrow diametric gap and securely bonds the components together upon cooling.
- braze alloy When using traditional brazing techniques, the braze alloy must flow from a ring or pocket to the braze area. In doing so, it is prone to flow imprecisely when melted. It is also not uncommon for braze fillets to be formed on or in certain features. In some instances intricate or narrow passages can become plugged if too much braze is used. These fillets and plugs can negatively affect nozzle performance. There is higher chance fillet formation of and plugs as the nozzle components become smaller, as in multipoint applications. The difficulties in controlling braze flow employing traditional brazing techniques is a limiting factor in the design of fuel and air flow passages. That is, the shape and size of the passages is limited by the ability to control the flow of braze.
- the subject invention is directed to a new and useful method of assembling an airblast injector.
- the method includes forming a fluid passage on an internal conical surface of a first nozzle component and/or on an outer conical surface of a second nozzle component configured and adapted to mate with the first nozzle component to form at least a portion of a fluid circuit therebetween.
- the fluid passage is configured and adapted to provide passage for fluid in the fluid circuit between the first and second nozzle components.
- the method further includes joining the first and second nozzle components together by engaging the second nozzle component within the first nozzle component.
- the step of joining can include engaging the second nozzle component into the first nozzle component in an interference fit. It is also possible for the step of forming a fluid passage to include forming a thread around at least a portion the internal conical surface of the first nozzle component and/or the outer conical surface of the second nozzle component. In addition, the step of forming a fluid passage can include forming a multiple-start thread around at least a portion of the internal conical surface of the first nozzle component and/or the outer conical surface of the second nozzle component for providing multiple individual outlets for the fluid circuit. It is also possible for the method to include a step of applying braze directly to the joint location on at least one of the first and second nozzle components. The method can also include a step of applying heat to the braze to form a braze joint at the joint location. The method can also include a step of welding the first and second nozzle components together at the joint location to form a weld joint.
- the invention also provides an injector comprising a fuel distributor with a fluid inlet, and a fluid outlet.
- a fluid circuit is provided for fluid communication between the fluid inlet and the fluid outlet and includes a passage defined along a cone.
- the fuel distributor can include an outer distributor ring and an inner distributor ring mounted within the outer distributor ring.
- the fluid circuit can be formed between the inner and outer distributor rings.
- the outer distributor ring can include an internal conical surface with a helically threaded fluid passage defined therein.
- the fluid circuit can be defined between the helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring.
- the internal conical surface of the outer distributor ring can include a multiple-start helically threaded fluid passage defined therein, wherein the fluid circuit is defined between the multiple-start helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring.
- the fuel distributor can also include a braze or a weld joint mounting the inner and outer distributor rings together.
- the braze or weld joint bounds the fluid circuit for confining fluid flowing therethrough.
- the invention also provides an injector for use in a multipoint fuel injection system.
- the injector includes first and second nozzle components, assembled as described above, to form a fuel distributor.
- the injector includes an inner heat shield mounted inboard of the second nozzle component for thermal isolation of fuel in the fuel distributor from compressor discharge air inboard of the inner heat shield.
- the injector further includes a core air swirler mounted inboard of the inner heat shield for swirling compressor discharge air inboard of the fuel distributor for atomizing fuel issued from the fuel distributor.
- the injector includes an outer heat shield assembly mounted outboard of the first nozzle component for thermal isolation of fuel in the fuel distributor from compressor discharge air outboard of the fuel distributor.
- the outer heat shield assembly can define an outer air circuit configured and adapted to issue compressor discharge air outboard of fuel issued from the fuel distributor.
- the outer air circuit can be configured and adapted to issue a swirl-free flow of air therethrough. It is also contemplated that, the outer air circuit can be configured and adapted to issue a converging flow of air therethrough to enhance swirl imparted on a flow of compressor discharge air issued from the core air swirler.
- FIG. 1 is a perspective view of an exemplary embodiment of an airblast injector constructed in accordance with the present invention
- FIG. 2 is an exploded perspective view of the airblast injector of FIG. 1 , showing how the fuel distributor constructed in accordance with the present invention can be assembled;
- FIG. 3 is a cross-sectional side elevation view of the airblast injector of FIG. 1 , showing components of the fuel distributor mounted together at a braze joint;
- FIG. 4 is an enlarged cross-section side elevation view of a portion of the airblast injector of FIG. 1 , showing a fluid circuit between an internal conical surface of an outer distributor ring and an outer conical surface of an inner distributor ring.
- FIG. 1 a partial view of an exemplary embodiment of the airblast injectors for multipoint injection in accordance with the invention is shown in FIG. 1 and is designated generally by reference character 100 .
- FIGS. 2-4 Other embodiments of the airblast injectors for multipoint injection in accordance with the invention, or aspects thereof, are provided in FIGS. 2-4 , as will be described.
- Airblast injector is adapted and configured for delivering fuel to the combustion chamber of a gas turbine engine.
- Nozzles used in conventional multipoint LDI configurations were pressure atomizing air assist nozzles.
- the conventional pressure atomizing air assist nozzles were generally inexpensive and light weight. In such conventional LDI configurations, it was found that the air assist nozzles had to be very small in order to allow a very large number of nozzles, for example nozzles in excess of 1000, in order to achieve the target low NO x emissions.
- the invention provides an injector 100 for use in a multipoint fuel injection system.
- Injector 100 includes first and second nozzle components, shown as outer and inner distributor rings 102 and 104 , respectively, to form a fuel distributor 106 .
- Injector 100 includes an inner heat shield 108 mounted inboard of inner distributor ring 104 for thermal isolation of fuel, as shown in FIG. 4 , in fuel distributor 106 from compressor discharge air inboard of inner heat shield 108 .
- Injector 100 further includes a core air swirler 109 mounted inboard of inner heat shield 108 for swirling compressor discharge air inboard of fuel distributor 106 for atomizing fuel issued from fuel distributor 106 .
- injector 100 includes an outer heat shield assembly 112 mounted outboard of first nozzle component 102 for thermal isolation of fuel in fuel distributor 106 from compressor discharge air outboard of fuel distributor 106 .
- outer heat shield assembly 112 allows injector 100 to be rotated to avoid spraying fluid on adjacent walls while still permitting sealing thereof within a cylindrical sealing feature to permit axial travel during thermal growth and contraction of the combustor.
- outer heat shield assembly 112 defines an outer air circuit 114 configured and adapted to issue compressor discharge air outboard of fuel issued from fuel distributor 106 .
- Outer air circuit 114 is configured and adapted to issue a swirl-free flow of air therethrough. Since outer air circuit 114 converges toward the central axis, outer air circuit 114 issues a converging flow of air therethrough to enhance swirl imparted on a flow of compressor discharge air issued from core air swirler 109 .
- fuel distributor 106 includes a fluid inlet 116 , and fluid outlet 118 , and a fluid circuit 120 .
- Fluid circuit 120 is for fluid communication between fluid inlet 116 and fluid outlet 118 and includes a three-start helically threaded fluid passage 128 , defined along a cone, i.e. internal conical surface 125 of outer distributor ring 102 .
- Fluid circuit 120 is defined between three-start helically threaded fluid passage 128 of internal conical surface 125 of outer distributor ring 102 and an outer conical surface 127 of inner distributor ring 104 .
- the passage can be any suitable number of starts for a given application. Typically, it is contemplated that one start should be provided for every 1-inch (2.54 cm) or circumference of the passage, however, any other suitable spacing can be used without departing from the spirit and scope of the invention.
- the multiple-start thread and multiple individual outlets provide enhanced performance when operating at low pressure, for example, the multiple-starts and multiple outlets of thread allow for even fuel distribution.
- the circumferential distribution of the fuel was aided by the use multiple-start threaded passages 128 because their inherent flow resistance divided very small quantities of fuel uniformly between fluid circuit 120 .
- the velocity of the fuel through fluid circuit 120 was substantially higher than it would be in a conventional airblast nozzle without threads 132 .
- High velocity and fluid friction increase fuel cooling ability and helps to keep the metallic walls temperature adjacent to threads 132 cool without overheating the fuel. Therefore, permitting the multiple-start threaded passages 128 maintain an extremely small wetted surface area of the nozzle as compared to conventional airblast nozzles. The smaller the wetted surface of the nozzle, the less coke contamination occurs.
- the use of the multiple-start threaded passage along a conical surface i.e. internal conical surface 125 and/or outer conical surface 127 , reduces the profile of wetted components and thus permits more space for air through the interior of the nozzle.
- the geometry of the multiple-start threaded passages 128 inherently imparts high degrees of swirl to the exiting fuel.
- the fuel flows nearly circumferentially at the exit 118 of the threads 132 and forms a uniform film on a short downstream lip of the nozzle. Intensely co-swirling air helps distribute the fuel circumferentially while it progresses to the final exit.
- the fuel film helps keep the short filming lip cool as it intervenes between the lip and the hot core air.
- fuel distributor 106 also includes a braze joint 130 mounting together inner and outer distributor rings, 104 and 102 .
- Braze joint 130 bounds fluid circuit 120 for confining fluid flowing therethrough. Since distributor 106 includes multiple-start helically threaded fluid passages 128 , braze joint 130 bounds fluid circuit 120 for confining fluid flowing therethrough.
- the method includes forming a fluid passage, i.e. multiple start helically threaded fluid passage 128 , on an at least one of an internal conical surface, i.e. internal conical surface 125 , of a first nozzle component, i.e. outer distributor ring 102 , and an outer conical surface, i.e. outer conical surface 127 , of a second nozzle component, i.e. inner distributor ring 104 .
- fluid passage 128 formed on internal conical surface 125 of outer distributor ring 102
- fluid passage 128 e.g. including a multiple-start thread as described above
- the inner distributor ring is configured and adapted to mate with the outer distributor ring to form at least a portion of a fluid circuit, i.e. fluid circuit 120 , therebetween.
- the fluid passage is configured and adapted to provide passage for fluid in the fluid circuit between the outer and inner distributor rings.
- the method further includes joining the outer and inner distributor rings together by engaging the inner distributor ring within first the nozzle component.
- Joining inner and outer distributor rings together also includes engaging the inner distributor ring into the outer distributor ring in an interference fit.
- the inner distributor ring can be engaged in an interference fit with the outer distributor ring by forcefully pulling the inner distributor ring towards the outlet of the outer distributor ring.
- an interference fit is not required, for example, the inner distributor ring can be disposed within the outer distributor ring and fixed with a weld or braze at joint 130 .
- inner distributor ring can be employed to form the inner wetted surface. It can be easily slid into position from the upstream end of the nozzle. The threads are cut on an adjacent conical surface, i.e. internal conical surface 125 of outer distributor ring 102 , which provides a stop for the inner distributor ring. Once the inner distributor ring is in position, it can be tacked into place at a joint location, i.e. joint location 130 , while pressing against the threads. The upstream end at the joint location is then brazed or welded to keep the ring in position and to seal the fluid circuit. Those having skill in the art will readily appreciate that this permits a purely mechanical placement.
- Inner distributor ring is so short, it minimizes weight it is effectively cooled by fuel. Reducing or minimizing the wetted surface of the nozzle reduces the length of the heat shield, i.e. inner or outer heat shields 108 and 112 , respectively, required to keep the wetted surface carrying components cool. It can also be appreciated that the heat shielding was functionally integrated into the components of injector 100 .
- Inner heat shield 108 forms the shroud for inner air swirler 109 into which swirler 109 could be brazed or welded. It also forms the inside of the heat shield for the feed tube of fuel circuit 120 .
- outer heat shield 112 can form the inner air shroud for outer air circuit 114 .
- Both inner and outer heat shields, 108 and 112 can be configured to attach together at the back of injector 100 where an air sealing weld or braze could be located.
- the heat shields, 108 and 112 thermally encapsulate inner and outer distributor rings 104 and 102 , allowing them to remain at around fuel temperature even if the air is at a much higher temperature as it arrives from the compressor. Gaps between adjacent shells permit the hot components to grow radially and axially unimpeded by the cold components. Zones where hot air can touch the fuel conveying components are reduced to an absolute minimum.
- the heat shielding is kept at a reduced weight as compared to conventional injectors. Combining functionality of heat shields 108 and 112 keep cost of the components to a minimum.
- the method also includes applying braze directly to the joint location on at least one of the outer and inner distributor rings.
- the braze is applied over tack beads between the outer and inner distributor rings at the braze location, i.e. braze joint 130 .
- Heat is then applied to the braze to form a braze joint at the joint location.
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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)
Abstract
Description
- This application claims priority to U.S. Provisional Patent Application No. 61/555,363 filed Nov. 3, 2011 which is incorporated by reference herein in its entirety.
- This invention was made with government support under contract number NNC11CA15C awarded by NASA. The government has certain rights in the invention.
- 1. Field of the Invention
- The present invention relates to airblast injection nozzles, and more particularly, to systems and methods for assembling components of airblast injection nozzles for multipoint injection.
- 2. Description of Related Art
- Multipoint lean direct injection (LDI) for gas turbine engines is well known in the art. Multipoint refers to the use of a large number of small airblast injector nozzles to introduce the fuel and air into the combustor. By using many very small airblast injector nozzles there is a reduction of the flow to individual nozzles, therein reducing the diameter of the nozzle. The volume of recirculation zone downstream of the nozzle is thought to be a controlling parameter for the quantity of NOx produced in a typical combustor. If the recirculation volume is proportional to the cube of the diameter of the mixer, and if the NOX produced is proportional to the recirculation volume, and the fuel flow is taken to be proportional to the square of the diameter of the mixer, then a larger nozzle will produce greater fuel flow, but also a greater emission index of NOX (EINOX).
- In addition, conventional construction of small sized injectors, nozzles, atomizers and the like, includes components bonding together with braze. The components have milled slots or drilled holes to control the flow of fuel and prepare the fuel for atomization. The components are typically nested within one another and form a narrow diametric gap which is filled with a braze alloy. The braze alloy is applied as a braze paste, wire ring, or as a thin sheet shim on the external surfaces or within pockets inside the assembly. The assembly is then heated and the braze alloy melts and flows into the narrow diametric gap and securely bonds the components together upon cooling.
- Such conventional methods and systems generally have been considered satisfactory for their intended purpose. However, when using traditional brazing techniques, the braze alloy must flow from a ring or pocket to the braze area. In doing so, it is prone to flow imprecisely when melted. It is also not uncommon for braze fillets to be formed on or in certain features. In some instances intricate or narrow passages can become plugged if too much braze is used. These fillets and plugs can negatively affect nozzle performance. There is higher chance fillet formation of and plugs as the nozzle components become smaller, as in multipoint applications. The difficulties in controlling braze flow employing traditional brazing techniques is a limiting factor in the design of fuel and air flow passages. That is, the shape and size of the passages is limited by the ability to control the flow of braze.
- There remains a need in the art for a method and system of assembling nozzles that will eliminate or greatly reduce fillet formation and/or plugging and allow for formation of intricate internal fuel and air flow passages. There also remains a need in the art for such a method and system that are easy and inexpensive to make and use. The present invention provides a solution for these problems.
- The subject invention is directed to a new and useful method of assembling an airblast injector. The method includes forming a fluid passage on an internal conical surface of a first nozzle component and/or on an outer conical surface of a second nozzle component configured and adapted to mate with the first nozzle component to form at least a portion of a fluid circuit therebetween. The fluid passage is configured and adapted to provide passage for fluid in the fluid circuit between the first and second nozzle components. The method further includes joining the first and second nozzle components together by engaging the second nozzle component within the first nozzle component.
- The step of joining can include engaging the second nozzle component into the first nozzle component in an interference fit. It is also possible for the step of forming a fluid passage to include forming a thread around at least a portion the internal conical surface of the first nozzle component and/or the outer conical surface of the second nozzle component. In addition, the step of forming a fluid passage can include forming a multiple-start thread around at least a portion of the internal conical surface of the first nozzle component and/or the outer conical surface of the second nozzle component for providing multiple individual outlets for the fluid circuit. It is also possible for the method to include a step of applying braze directly to the joint location on at least one of the first and second nozzle components. The method can also include a step of applying heat to the braze to form a braze joint at the joint location. The method can also include a step of welding the first and second nozzle components together at the joint location to form a weld joint.
- The invention also provides an injector comprising a fuel distributor with a fluid inlet, and a fluid outlet. A fluid circuit is provided for fluid communication between the fluid inlet and the fluid outlet and includes a passage defined along a cone.
- The fuel distributor can include an outer distributor ring and an inner distributor ring mounted within the outer distributor ring. The fluid circuit can be formed between the inner and outer distributor rings. It is possible for the outer distributor ring to include an internal conical surface with a helically threaded fluid passage defined therein. The fluid circuit can be defined between the helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring. The internal conical surface of the outer distributor ring can include a multiple-start helically threaded fluid passage defined therein, wherein the fluid circuit is defined between the multiple-start helically threaded fluid passage of the internal conical surface of the outer distributor ring and an outer conical surface of the inner distributor ring.
- The fuel distributor can also include a braze or a weld joint mounting the inner and outer distributor rings together. The braze or weld joint bounds the fluid circuit for confining fluid flowing therethrough.
- The invention also provides an injector for use in a multipoint fuel injection system. The injector includes first and second nozzle components, assembled as described above, to form a fuel distributor. The injector includes an inner heat shield mounted inboard of the second nozzle component for thermal isolation of fuel in the fuel distributor from compressor discharge air inboard of the inner heat shield. The injector further includes a core air swirler mounted inboard of the inner heat shield for swirling compressor discharge air inboard of the fuel distributor for atomizing fuel issued from the fuel distributor. In addition, the injector includes an outer heat shield assembly mounted outboard of the first nozzle component for thermal isolation of fuel in the fuel distributor from compressor discharge air outboard of the fuel distributor.
- The outer heat shield assembly can define an outer air circuit configured and adapted to issue compressor discharge air outboard of fuel issued from the fuel distributor. The outer air circuit can be configured and adapted to issue a swirl-free flow of air therethrough. It is also contemplated that, the outer air circuit can be configured and adapted to issue a converging flow of air therethrough to enhance swirl imparted on a flow of compressor discharge air issued from the core air swirler.
- These and other features of the systems and methods of the subject invention will become more readily apparent to those skilled in the art from the following detailed description of the preferred embodiments taken in conjunction with the drawings.
- So that those skilled in the art to which the subject invention appertains will readily understand how to make and use the devices and methods of the subject invention without undue experimentation, preferred embodiments thereof will be described in detail herein below with reference to certain figures, wherein:
-
FIG. 1 is a perspective view of an exemplary embodiment of an airblast injector constructed in accordance with the present invention; -
FIG. 2 is an exploded perspective view of the airblast injector ofFIG. 1 , showing how the fuel distributor constructed in accordance with the present invention can be assembled; -
FIG. 3 is a cross-sectional side elevation view of the airblast injector ofFIG. 1 , showing components of the fuel distributor mounted together at a braze joint; and -
FIG. 4 is an enlarged cross-section side elevation view of a portion of the airblast injector ofFIG. 1 , showing a fluid circuit between an internal conical surface of an outer distributor ring and an outer conical surface of an inner distributor ring. - Reference will now be made to the drawings wherein like reference numerals identify similar structural features or aspects of the subject invention. For purposes of explanation and illustration, and not limitation, a partial view of an exemplary embodiment of the airblast injectors for multipoint injection in accordance with the invention is shown in
FIG. 1 and is designated generally byreference character 100. Other embodiments of the airblast injectors for multipoint injection in accordance with the invention, or aspects thereof, are provided inFIGS. 2-4 , as will be described. Airblast injector is adapted and configured for delivering fuel to the combustion chamber of a gas turbine engine. - Nozzles used in conventional multipoint LDI configurations were pressure atomizing air assist nozzles. The conventional pressure atomizing air assist nozzles were generally inexpensive and light weight. In such conventional LDI configurations, it was found that the air assist nozzles had to be very small in order to allow a very large number of nozzles, for example nozzles in excess of 1000, in order to achieve the target low NOx emissions.
- Conventional pressure atomizing air assist nozzle systems generally have been considered satisfactory for their intended purpose, however it is desired to reduce cost, complexity and poor low power operability since the fuel had to be divided among so many nozzles. The air blast nozzle approach is advantageous in multipoint applications because of its ability to mix fuel and air more efficiently, permitting the use of larger nozzles. Fewer air blast nozzles are required than with the pressure atomizing types while still achieving low NOx. This contravenes the idea that larger nozzles produce higher NOx emissions index (EINOx). However it was found that continuing to increase the diameter of the conventional air blast nozzles in order to reduce the total number, again caused higher NOx emissions. This means that there is an optimum size associated with nozzles to reduce emissions and that air blast nozzles have had an advantage over conventional pressure atomizing air assist permitting fewer nozzles.
- One source of difficulty associated with conventional air blast nozzles is the way fuel is distributed. Fuel cannot be exposed to excessive heat, for example wall temperatures exceeding 400° F., without destabilizing and depositing coke in the channel. Coke can block the channel and impede nozzle performance of the nozzle. In conventional pressure atomizing air assist nozzles, as discussed above, fuel emanates from a small centrally located hole. The channels feeding the hole are usually located in a symmetrical, location which is easily insulated from heat. In conventional air blast nozzles, fuel is distributed over a large diameter near the exit of the nozzle. The fuel feed channels in conventional air blast nozzles tend to be much larger than in the conventional pressure atomizing air assist nozzles and they are generally adjacent to substantial hot air channels which heat the nozzle. Keeping the fuel cool in conventional air blast nozzles requires the use of substantial amounts of heat shielding which adds to the cost and weight. In addition, the necessity of flowing air through the core of the nozzle requires an asymmetric fuel feed channel be utilized which adds additional complexity. In general, in order to increase the ultimate mixing rate with air at the exit, the spread of fuel flow segregated from air within the geometry of the conventional air blast nozzle makes the nozzle much more vulnerable to fuel overheating and coke contamination. It is desired to reduce complexity of manufacture, weight, cost and coke contamination of conventional air blast nozzles.
- With reference to
FIGS. 1 and 2 , the invention provides aninjector 100 for use in a multipoint fuel injection system.Injector 100 includes first and second nozzle components, shown as outer and inner distributor rings 102 and 104, respectively, to form afuel distributor 106.Injector 100 includes aninner heat shield 108 mounted inboard ofinner distributor ring 104 for thermal isolation of fuel, as shown inFIG. 4 , infuel distributor 106 from compressor discharge air inboard ofinner heat shield 108.Injector 100 further includes acore air swirler 109 mounted inboard ofinner heat shield 108 for swirling compressor discharge air inboard offuel distributor 106 for atomizing fuel issued fromfuel distributor 106. In addition,injector 100 includes an outerheat shield assembly 112 mounted outboard offirst nozzle component 102 for thermal isolation of fuel infuel distributor 106 from compressor discharge air outboard offuel distributor 106. Those having skill in the art will readily appreciate that the spherical shape of outerheat shield assembly 112 allowsinjector 100 to be rotated to avoid spraying fluid on adjacent walls while still permitting sealing thereof within a cylindrical sealing feature to permit axial travel during thermal growth and contraction of the combustor. - With reference now to
FIG. 3 , outerheat shield assembly 112 defines anouter air circuit 114 configured and adapted to issue compressor discharge air outboard of fuel issued fromfuel distributor 106.Outer air circuit 114 is configured and adapted to issue a swirl-free flow of air therethrough. Sinceouter air circuit 114 converges toward the central axis,outer air circuit 114 issues a converging flow of air therethrough to enhance swirl imparted on a flow of compressor discharge air issued fromcore air swirler 109. - With reference now
FIGS. 3 and 4 ,fuel distributor 106 includes afluid inlet 116, andfluid outlet 118, and afluid circuit 120.Fluid circuit 120 is for fluid communication betweenfluid inlet 116 andfluid outlet 118 and includes a three-start helically threadedfluid passage 128, defined along a cone, i.e. internalconical surface 125 ofouter distributor ring 102.Fluid circuit 120 is defined between three-start helically threadedfluid passage 128 of internalconical surface 125 ofouter distributor ring 102 and an outerconical surface 127 ofinner distributor ring 104. Although shown and described herein as a three-start helically threaded fluid passage, those skilled in the art will readily appreciate that the passage can be any suitable number of starts for a given application. Typically, it is contemplated that one start should be provided for every 1-inch (2.54 cm) or circumference of the passage, however, any other suitable spacing can be used without departing from the spirit and scope of the invention. Those having skill in the art will readily appreciate that the multiple-start thread and multiple individual outlets provide enhanced performance when operating at low pressure, for example, the multiple-starts and multiple outlets of thread allow for even fuel distribution. - In addition, the circumferential distribution of the fuel was aided by the use multiple-start threaded
passages 128 because their inherent flow resistance divided very small quantities of fuel uniformly betweenfluid circuit 120. Therein, the velocity of the fuel throughfluid circuit 120 was substantially higher than it would be in a conventional airblast nozzle withoutthreads 132. High velocity and fluid friction increase fuel cooling ability and helps to keep the metallic walls temperature adjacent tothreads 132 cool without overheating the fuel. Therefore, permitting the multiple-start threadedpassages 128 maintain an extremely small wetted surface area of the nozzle as compared to conventional airblast nozzles. The smaller the wetted surface of the nozzle, the less coke contamination occurs. In addition, the use of the multiple-start threaded passage along a conical surface, i.e. internalconical surface 125 and/or outerconical surface 127, reduces the profile of wetted components and thus permits more space for air through the interior of the nozzle. - Further, the geometry of the multiple-start threaded
passages 128 inherently imparts high degrees of swirl to the exiting fuel. The fuel flows nearly circumferentially at theexit 118 of thethreads 132 and forms a uniform film on a short downstream lip of the nozzle. Intensely co-swirling air helps distribute the fuel circumferentially while it progresses to the final exit. Those having skill in the art would readily appreciate that the fuel film helps keep the short filming lip cool as it intervenes between the lip and the hot core air. - Now referring to
FIG. 4 ,fuel distributor 106 also includes a braze joint 130 mounting together inner and outer distributor rings, 104 and 102. Braze joint 130 boundsfluid circuit 120 for confining fluid flowing therethrough. Sincedistributor 106 includes multiple-start helically threadedfluid passages 128, braze joint 130 boundsfluid circuit 120 for confining fluid flowing therethrough. - With reference now to
FIG. 2 , a method of assembling an airblast injector, i.e.injector 100, is described. The method includes forming a fluid passage, i.e. multiple start helically threadedfluid passage 128, on an at least one of an internal conical surface, i.e. internalconical surface 125, of a first nozzle component, i.e.outer distributor ring 102, and an outer conical surface, i.e. outerconical surface 127, of a second nozzle component, i.e.inner distributor ring 104. While shown herein in the exemplary context offluid passage 128 formed on internalconical surface 125 ofouter distributor ring 102, those skilled in the art will readily appreciate thatfluid passage 128, e.g. including a multiple-start thread as described above, in addition or instead, can be formed on outerconical surface 127 ofinner distributor ring 104. The inner distributor ring is configured and adapted to mate with the outer distributor ring to form at least a portion of a fluid circuit, i.e.fluid circuit 120, therebetween. The fluid passage is configured and adapted to provide passage for fluid in the fluid circuit between the outer and inner distributor rings. - With continued reference to
FIG. 2 , the method further includes joining the outer and inner distributor rings together by engaging the inner distributor ring within first the nozzle component. Joining inner and outer distributor rings together also includes engaging the inner distributor ring into the outer distributor ring in an interference fit. The inner distributor ring can be engaged in an interference fit with the outer distributor ring by forcefully pulling the inner distributor ring towards the outlet of the outer distributor ring. Those skilled in the art will readily appreciate that due to the conical surfaces involved joining the outer and inner distributor rings together, an interference fit is not required, for example, the inner distributor ring can be disposed within the outer distributor ring and fixed with a weld or braze at joint 130. Those skilled in the art will readily appreciate that without the inner and outer rings joined together in an interference fit, fuel will still follow the helically threadedfluid passage 128 due to the pressure differential between theinlet 116 andoutlet 118. In addition, those having skill in the art will readily appreciate that due to the conical surfaces involved joining the outer and inner distributor rings together does not require thermal resizing to tightly fit the inner distributor ring over the threads to seal the fuel, thereby permitting more efficient and cost effective manufacture and assembly. - With reference now to
FIGS. 2 and 3 , inner distributor ring can be employed to form the inner wetted surface. It can be easily slid into position from the upstream end of the nozzle. The threads are cut on an adjacent conical surface, i.e. internalconical surface 125 ofouter distributor ring 102, which provides a stop for the inner distributor ring. Once the inner distributor ring is in position, it can be tacked into place at a joint location, i.e.joint location 130, while pressing against the threads. The upstream end at the joint location is then brazed or welded to keep the ring in position and to seal the fluid circuit. Those having skill in the art will readily appreciate that this permits a purely mechanical placement. - In addition, those having skill in the art will appreciate that because the inner distributor ring is so short, it minimizes weight it is effectively cooled by fuel. Reducing or minimizing the wetted surface of the nozzle reduces the length of the heat shield, i.e. inner or
outer heat shields injector 100.Inner heat shield 108 forms the shroud forinner air swirler 109 into which swirler 109 could be brazed or welded. It also forms the inside of the heat shield for the feed tube offuel circuit 120. - In reference to
FIGS. 1 and 2 ,outer heat shield 112 can form the inner air shroud forouter air circuit 114. Both inner and outer heat shields, 108 and 112, can be configured to attach together at the back ofinjector 100 where an air sealing weld or braze could be located. Once attached, the heat shields, 108 and 112, thermally encapsulate inner and outer distributor rings 104 and 102, allowing them to remain at around fuel temperature even if the air is at a much higher temperature as it arrives from the compressor. Gaps between adjacent shells permit the hot components to grow radially and axially unimpeded by the cold components. Zones where hot air can touch the fuel conveying components are reduced to an absolute minimum. By keepinginjector 100 components small, the heat shielding is kept at a reduced weight as compared to conventional injectors. Combining functionality ofheat shields - Now with reference to
FIG. 3 , the method also includes applying braze directly to the joint location on at least one of the outer and inner distributor rings. The braze is applied over tack beads between the outer and inner distributor rings at the braze location, i.e. braze joint 130. Heat is then applied to the braze to form a braze joint at the joint location. Those having skill in the art will readily appreciate that by applying braze directly to the braze joint, there is less chance for the braze to form fillets on or in certain features, for example, the fluid circuit. - While shown and described in the exemplary context of multipoint injection for gas turbine engines, those skilled in the art will readily appreciate that the apparatus and method described herein can be used for any other suitable application. Moreover, while the apparatus is shown in the exemplary process described herein, those skilled in the art will readily appreciate that it can be made by any other suitable process or processes without departing from the scope of the invention.
- The methods and systems of the present invention, as described above and shown in the drawings, provide for systems and methods for assembling components of airblast injection nozzles for multipoint injection with superior properties including reduced formation of fillets and plugs during brazing. While the apparatus and methods of the subject invention have been shown and described with reference to preferred embodiments, those skilled in the art will readily appreciate that changes and/or modifications may be made thereto without departing from the spirit and scope of the subject invention.
Claims (18)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/665,568 US20140339339A1 (en) | 2011-11-03 | 2012-10-31 | Airblast injectors for multipoint injection and methods of assembly |
EP12191139.0A EP2589866B1 (en) | 2011-11-03 | 2012-11-02 | Airblast injectors for multipoint injection |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161555363P | 2011-11-03 | 2011-11-03 | |
US13/665,568 US20140339339A1 (en) | 2011-11-03 | 2012-10-31 | Airblast injectors for multipoint injection and methods of assembly |
Publications (1)
Publication Number | Publication Date |
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US20140339339A1 true US20140339339A1 (en) | 2014-11-20 |
Family
ID=47227496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/665,568 Abandoned US20140339339A1 (en) | 2011-11-03 | 2012-10-31 | Airblast injectors for multipoint injection and methods of assembly |
Country Status (2)
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US (1) | US20140339339A1 (en) |
EP (1) | EP2589866B1 (en) |
Cited By (13)
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US20130256431A1 (en) * | 2012-03-30 | 2013-10-03 | Solar Turbines Incorporated | Air blocker ring assembly with blocker ring protrusions |
US9897321B2 (en) | 2015-03-31 | 2018-02-20 | Delavan Inc. | Fuel nozzles |
US10132500B2 (en) | 2015-10-16 | 2018-11-20 | Delavan Inc. | Airblast injectors |
EP3499127A1 (en) * | 2017-12-15 | 2019-06-19 | Delavan, Inc. | Tapered helical fuel distributor |
US10385809B2 (en) | 2015-03-31 | 2019-08-20 | Delavan Inc. | Fuel nozzles |
US20190309949A1 (en) * | 2018-04-10 | 2019-10-10 | Delavan Inc. | Fuel injectors for turbomachines having inner air swirling |
US10876477B2 (en) | 2016-09-16 | 2020-12-29 | Delavan Inc | Nozzles with internal manifolding |
US10982856B2 (en) | 2019-02-01 | 2021-04-20 | Pratt & Whitney Canada Corp. | Fuel nozzle with sleeves for thermal protection |
US11067278B2 (en) * | 2015-06-24 | 2021-07-20 | Delavan Inc. | Cooling in staged fuel systems |
US11118785B2 (en) * | 2018-10-26 | 2021-09-14 | Delavan Inc. | Fuel injectors for exhaust heaters |
US11131458B2 (en) * | 2018-04-10 | 2021-09-28 | Delavan Inc. | Fuel injectors for turbomachines |
US11143406B2 (en) * | 2018-04-10 | 2021-10-12 | Delavan Inc. | Fuel injectors having air sealing structures |
US20220099298A1 (en) * | 2017-07-21 | 2022-03-31 | Delavan Inc. | Fuel injectors and methods of making fuel injectors |
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US9188063B2 (en) | 2011-11-03 | 2015-11-17 | Delavan Inc. | Injectors for multipoint injection |
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US11131458B2 (en) * | 2018-04-10 | 2021-09-28 | Delavan Inc. | Fuel injectors for turbomachines |
US11143406B2 (en) * | 2018-04-10 | 2021-10-12 | Delavan Inc. | Fuel injectors having air sealing structures |
US11118785B2 (en) * | 2018-10-26 | 2021-09-14 | Delavan Inc. | Fuel injectors for exhaust heaters |
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Also Published As
Publication number | Publication date |
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EP2589866B1 (en) | 2022-01-12 |
EP2589866A2 (en) | 2013-05-08 |
EP2589866A3 (en) | 2017-01-25 |
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