CN103123122A - Lean oil pre-mixing and pre-evaporating low-pollution combustion chamber capable of ejecting main-stage fuel oil directly - Google Patents
Lean oil pre-mixing and pre-evaporating low-pollution combustion chamber capable of ejecting main-stage fuel oil directly Download PDFInfo
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Abstract
The invention relates to a lean oil pre-mixing and pre-evaporating low-pollution combustion chamber capable of ejecting main-stage fuel oil directly, and belongs to the field of aero-engines. The core idea of the lean oil pre-mixing and pre-evaporating low-pollution combustion chamber is air classification and fuel oil classification. The lean oil pre-mixing and pre-evaporating low-pollution combustion chamber is composed of an on-duty stage/subsidiary mold and a mainstage / main mold, wherein the on-duty stage is composed of a first-stage axial swirler (8), a second-stage axial swirler (9), a sleeve (10) and an on-duty stage contraction and expansion segment (20), realizes diffusive combustion and provides a stable ignition source; and the main stage comprises a main-stage swirler (11), a main-stage oil supply pipe (15), an oil collection cavity (16), a fuel oil direct-injection type nozzle (17), a main-stage contraction and expansion segment (12) and a main-stage pre-mixing annular cavity (22) and is used for combusting a part of pre-mixed and pre-evaporated lean oil and lowering a high-temperature hotspot so as to reduce the emission of thermal nitric oxide (NOX). The lean oil pre-mixing and pre-evaporating low-pollution combustion chamber is in the mode of lean oil pre-mixing and pre-evaporating combustion with a central classification idea, other properties of the chamber cannot be sacrificed, and the emission of pollutants, including the NOX, smoke, carbon oxide (CO) and unburned hydrocarbon (UHC), of an aero-engine chamber can be effectively lowered at the same time.
Description
Technical field
The present invention relates to a kind of lean premixed preevaporated low contamination combustion chamber of main fuel direct injection, belong to the aero engine technology field.
Background technology
At present, the civil aviation engine is increasing to the pollutant of airborne release, and atmosphere pollution also is on the rise.The impact that environment is caused in order to control aircraft engine emission, civil aircraft combustion chamber emission requirement satisfies the ICAO CAEP of International Civil Aviation Organization standard, and that carry out at present is CAEP6, particularly to NO
XEmission request is more and more stricter.In order to satisfy the CAEP standard, each large aero-engine company and research institution all carry out the research of combustion with reduced pollutants technology, GE company has developed dicyclo premixed swirl (Twin Annular Premixing Swirler, TAPS) combustion technology, discharge capacity approximately hangs down 65% than ICAO standard in 1996; Pu Hui company adopts the RQL combustion technology to develop the 3rd generation TALON III combustion chamber.
What tradition military secret main chamber adopted is diffusion combustion, and under 100% operating mode, main combustion zone oil-gas ratio is the appropriate oil-gas ratio design of chemistry, and efficiency of combustion is high, but the primary zone fuel gas temperature is very high, therefore can produce a large amount of thermal NO x; And when the slow train operating mode, efficiency of combustion is low, incomplete combustion, so pollutant CO and UHC generate many.Therefore, conventional diffusion combustion mode is difficult to reach at present or low pollution emission requirement in the future.At present, mainly adopt the lean premixed preevaporated low contamination combustion system at the civil aviation engine chamber that grinds, most crucial thought is that air and fuel oil are carried out classification, air enters head of combustion chamber from main/main mould and level/secondary mould on duty respectively, the general low discharge pressure atomized fog jet that adopts of level on duty carries out diffusion combustion mode, and main is generally carried out partly-premixed burning, thereby realizes the lean premixed preevaporated burning in combustion chamber, because the main-stage combustion temperature is even, thereby reduce pollutant NO
XDischarging.
Summary of the invention
The present invention is directed to the deficiency of the problems referred to above, a kind of lean premixed preevaporated low contamination combustion chamber of main fuel direct injection is proposed, is satisfying under the performance condition of aero-engine this combustion chamber, can effectively reduce aeroengine combustor buring chamber contamination discharging, comprises NOx, smolders, CO and UHC.
the present invention is that the technical scheme that solves the problems of the technologies described above proposition is: a kind of lean premixed preevaporated low contamination combustion chamber of main fuel direct injection, comprise head of combustion chamber, burner inner liner, ring passage (25) in the combustion chamber, combustion chamber outer ring channel (24), Fuel Injector Bar (21) and casing, Fuel Injector Bar (21) is arranged on casing (6), head of combustion chamber is connected with casing by Fuel Injector Bar (21), and head of combustion chamber, in the combustion chamber, ring passage (25) and combustion chamber outer ring channel (24) are by the design of assignment of traffic rule, described Fuel Injector Bar (21) is provided with two oil line pipes of level swirl atomizer (7) on duty and main fuel feed pump (15), described head of combustion chamber is circular dicyclo cavity configuration, be divided into level/secondary mould on duty (1) and main/main mould (2) two parts, and described main (2) is looped around the outer shroud of level on duty (1), described level on duty comprises one-level axial swirler (8), secondary axial swirler (9), sleeve (10) and level on duty are received and are expanded section (20), one-level axial swirler (8) and secondary axial swirler (9) rotation direction can be identical also can be opposite, described one-level axial swirler (8) is looped around outside swirl atomizer (7), and secondary axial swirler (9) is looped around the outside of one-level axial swirler (8), connection value class's receipts expansion sections (20) between described one-level axial swirler (8) and secondary axial swirler (9), and level on duty is received and is expanded the exit that section (20) is positioned at one-level axial swirler (8), and sleeve (10) is arranged on the outside of secondary axial swirler (9), main comprises main cyclone (11), main fuel feed pump (15), collection chamber (16), fuel oil direct-injection type spout (17), main is received and is expanded section (12) and main premix ring cavity (22), described main cyclone (11) is looped around the outside of sleeve (10), and Fuel Injector Bar (21), main fuel feed pump (15), collection chamber (16), fuel oil direct-injection type spout (17), main cyclone (11), main premix ring cavity (22) connects successively, and fuel oil direct-injection type spout 17 is arranged in the blade path of main cyclone 11, simultaneously described main is received and is expanded the outlet that section (12) is arranged on main premix ring cavity (22).
Further: be provided with ring cooling package (3) in head between described main and level on duty, air encircles in head that in head on cooling package (3), the cooling aperture of ring (18) enters, and impacts cooling to ring shelves splash basins (19) in head; And being provided with head outer shroud cooling package (4) between described main and burner inner liner, the head outer shroud cooling aperture (13) of air on head outer shroud cooling package (4) enters, and impacts cooling to head outer shroud shelves splash basins (14).
preferably: the blade of described one-level axial swirler (8), level on duty is received the expansion section and is crossed whole machining with the blade pass of secondary axial swirler (9), the mode such as monoblock cast or welding is processed to form, sleeve (10) links with level shelves splash basin (19) on duty and head interior ring cooling package (3) welding, in head, ring cooling package (3) links by welding or links by bolt with main (2), main (2) is welded to each other with head outer shroud cooling package (4) or bolt is connected, main collection chamber and main (2) can interconnect by welding or bolt.
Preferably: the distributed quantity of described fuel oil direct-injection type spout (17) on annulus is 6～36.
Preferably: the eddy flow angle of described level one-level axial swirler on duty (8) is 20 °～45 °, the lobe numbers of one-level axial swirler (8) is 8～16, and the rotation direction of one-level axial swirler (8) blade can be clockwise or counterclockwise along airflow direction, and is opposite with the spraying rotation direction in principle; Described level secondary axial swirler (9) blade angle on duty is 25 °～45 °, and lobe numbers is 8～20; Secondary axial swirler (9) vane cyclone setting angle is opposite or identical with one-level axial swirler (8) vane cyclone setting angle.
Preferably: the expansion angle of described sleeve (10) is 8 °～20 °.
Preferably: described main cyclone (11) is radial swirler or axial swirler; Described radial swirler blade angle is 40 °～60 °, and lobe numbers is 12～40; Described axial swirler blade angle is 30 °～70 °, and lobe numbers is 6～48.
Preferably: the air capacity of described head of combustion chamber accounts for 50%～85% of combustion chamber total air, and wherein main combustion stage accounts for 60%～90% of head air capacity, and pre-combustion grade accounts for 10%～40% of head air capacity.
Preferably: the cooling employing all standing air film of described burner inner liner (5) is cooling, impact and disperse cooling or other Compound cooling mode, and described burner inner liner rear portion is furnished with a plurality of blending hole according to actual needs.
The course of work of the present invention:
After entering the combustion chamber from the air of high-pressure compressor from diffuser (23), divide afterwards three the tunnel to enter respectively in the combustion chamber ring passage (25), head of combustion chamber and combustion chamber outer ring channel (24), the air of inner and outer rings passage blending hole and the film cooling holes from the burner inner liner (5) respectively enters burner inner liner.In the combustion chamber, burning use gas major part feeds from the head, and other all feeds from burner inner liner with gas.And head of combustion chamber comprises level (1) and main (2) on duty.in level on duty (1), fuel oil (account for total fuel oil 5%～50%) sprays and carries out primary atomization through swirl atomizer (7), be subject to from the shock that is looped around its one-level axial swirler (8) air-flow on every side broken, form secondary-atomizing, following level receipts expansion sections on duty (20) outlet is subjected to the shearing-crushing of one-level axial swirler (8) and secondary axial swirler (9) exit flow to carry out three atomizings, gas mixture after blending enters combustor primary zone and carries out the part diffusion combustion, forms the point of safes burning things which may cause a fire disaster, for main, fuel oil (account for total fuel oil 50%～95%) enters main collection chamber (16) from fuel feed pump (15), spray through main fuel oil direct projection spout (17) respectively again, can regulate main fuel oil direct-injection type spout spray angle and axial location, regulate main fuel-oil atmozation situation, because main fuel oil direct-injection type spout (17) is arranged in the main blade path, and because the fuel oil injection direction is mutually vertical or relative with the primary air flow direction, fuel oil is under the main Aerodynamic force action, realize broken, atomizing, enter afterwards main premix ring cavity (22), fuel oil continues in premix ring cavity (22) with air to mix and partly enters the combustion zone after evaporation, form lean premixed burning.
The lean premixed preevaporated low contamination combustion chamber of a kind of main fuel direct injection of the present invention compared to existing technology, has following beneficial effect:
1. because level on duty is comprised of one-level or two-stage (comprise in the same way or oppositely) axial swirler and pressure atomized fog jet, form diffusion flame, so the point of safes burning things which may cause a fire disaster can be provided, take into account igniting/extinguishment characteristics and slow train operating mode efficiency of combustion problem.
2. because main is comprised of a radial swirler or axial swirler, cavity and a plurality of fuel direct injections holes, thereby carries out partly-premixed prevapourising and evenly burn, reduce high temperature hotspot, thereby reduce NO under large operating mode
X、Smolder, CO and UHC discharging, simultaneously and the main fuel-oil atmozation mode of the type simple in structure.
3. account for 40%～70% left and right of whole diffuser air inlet due to the main combustion stage air inlet, and fuel oil accounts for 50%～95% of total fuel oil, and carried out partly-premixed prevapourising in cavity, therefore substantially realize the premix and pre-evaporation burning, reduce pollutant emission, level simultaneously on duty provides reliable and stable incendiary source.
4. level on duty is received expansion section (20), main is received and expanded section (12) owing to being provided with, thereby effectively prevents lean premixed preevaporated aflame tempering, nozzle carbon distribution problem.
5. encircle in the head on cooling package (3) the cooling aperture of ring (18) in head enters due to air, impact cooling to ring shelves splash basins (19) in head, the head outer shroud cooling aperture (13) of air on head outer shroud cooling package (4) enters simultaneously, head outer shroud shelves splash basins (14) are impacted cooling, thereby the service life of prolonging combustion chamber head.
Cooling due to the cooling employing all standing air film of burner inner liner (5), impact and to disperse cooling or other Compound cooling mode, thereby control the flame tube wall surface temperature, thereby extend burner inner liner service life; Arrange according to actual needs blending hole at the burner inner liner rear portion, thereby control combustion chamber outlet temperature distributes.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the head of combustion chamber structure enlarged drawing of Fig. 1;
wherein: 1. level/secondary mould on duty, 2. main/main mould, 3. encircle cooling package in head, 4. head outer shroud cooling package, 5. burner inner liner, 6. casing, 7. level on duty swirl atomizer, 8. one-level axial swirler, 9. secondary axial swirler, 10. sleeve, 11. main cyclone, 12. receiving, main expands section, 13. the cooling aperture of head outer shroud, 14. head outer shroud shelves splash basin, 15. main fuel feed pump, 16. collection chamber, 17. fuel oil direct-injection type spout, 18. the cooling aperture of ring in head, 19. ring shelves splash basin in head, 20. receiving, level on duty expands section, 21. Fuel Injector Bar, 22. main premix ring cavity, 23. diffuser, 24. combustion chamber outer ring channel, 25. ring passage in the combustion chamber.
The specific embodiment
Accompanying drawing discloses the structural representation of a preferred embodiment of the invention without limitation, explains technical scheme of the present invention below with reference to accompanying drawing.
Embodiment
lean premixed preevaporated low contamination combustion chamber such as Fig. 1 of a kind of main fuel direct injection of the present embodiment, shown in 2, comprise head of combustion chamber, burner inner liner 5, ring passage 25 in the combustion chamber, combustion chamber outer ring channel 24, Fuel Injector Bar 21 and casing, Fuel Injector Bar 21 is arranged on casing 6, be the head of combustion chamber fuel feeding on the one hand, bear on the other hand a part of mechanical force, head of combustion chamber is connected with casing 6 by Fuel Injector Bar 21, and head of combustion chamber, in the combustion chamber, ring passage 25 and combustion chamber outer ring channel 24 are by the design of assignment of traffic rule, in, the air of outer ring channel blending hole and the film cooling holes from the burner inner liner 5 respectively enters burner inner liner, described Fuel Injector Bar 21 is provided with two oil line pipes of level swirl atomizer 7 on duty and main fuel feed pump 15, described head of combustion chamber is circular dicyclo cavity configuration, be divided into level/secondary mould 1 on duty and main/main mould 2 two parts, and described main 2 is looped around the outer shroud of level 1 on duty, described level on duty comprises one-level axial swirler 8, secondary axial swirler 9, sleeve 10 and level on duty are received and are expanded section 20, one-level axial swirler 8 and secondary axial swirler 9 rotation directions can be identical also can be opposite, described one-level axial swirler 8 is looped around level on duty swirl atomizer 7 outsides, and secondary axial swirler 9 is looped around the outside of one-level axial swirler 8, between described one-level axial swirler 8 and secondary axial swirler 9, connection value class receives and expands section 20, and level on duty is received and is expanded the exit that section 20 is positioned at one-level axial swirler 8, level on duty is received expansion section 20 and is equivalent to Venturi tube, the design of its contraction section angle and expansion segment angle is all very important, can effectively prevent tempering, the nozzle carbon distribution, and sleeve 10 is arranged on the outside of secondary axial swirler 9, main comprises that main cyclone 11, main fuel feed pump 15, collection chamber 16, fuel oil direct-injection type spout 17, main receipts expand section 12 and main premix ring cavity 22, described main cyclone 11 is looped around the outside of sleeve 10, and Fuel Injector Bar 21, main fuel feed pump 15, collection chamber 16, fuel oil direct-injection type spout 17, main cyclone 11, main premix ring cavity 22 connect successively, and fuel oil direct-injection type spout 17 is arranged in the blade path of main cyclone 11, and simultaneously described main is received and expanded the outlet that section 12 is arranged on main premix ring cavity 22.
Be provided with ring cooling package 3 in head between described main 2 and level on duty 1, air encircle in head that in head on cooling package 3, the cooling aperture 18 of ring enters, and impacts cooling to a ring grade splash basin 19 in head; And being provided with head outer shroud cooling package 4 between described main and burner inner liner, the cooling aperture 13 of the head outer shroud of air on head outer shroud cooling package 4 enters, and impacts cooling to head outer shroud shelves splash basin 14.
The blade of described one-level axial swirler 8, level receipts expansion section on duty are crossed the modes such as whole machining, monoblock cast or welding and are processed to form with the blade pass of secondary axial swirler 9, sleeve 10 links with level shelves splash basin 19 on duty and 3 welding of the interior ring of head cooling package, in head, ring cooling package 3 links by welding or links by bolt with main 2, main 2 is welded to each other with head outer shroud cooling package 4 or bolt is connected, and main collection chamber and main 2 can interconnect by welding or bolt.
Distributed quantity, spray angle and the axial distance of described fuel oil direct-injection type spout 17 on annulus can be determined according to required duty and main lobe numbers, the distributed quantity of described fuel oil direct-injection type spout 17 on annulus is 6～36, the spray angle of fuel oil direct-injection type spout 17 is between-45 °～45 °, so that the air-fuel mixture in main premix chamber 22 is more even; And different according to operating mode, the number that fuel oil direct-injection type spout 17 is opened can be controlled.
The eddy flow angle of described level one-level axial swirler 8 on duty is 20 °～45 °, the lobe numbers of one-level axial swirler 8 is 8～16, specifically determine according to actual conditions, the rotation direction of one-level axial swirler 8 blades can be clockwise or counterclockwise along airflow direction, opposite with the spraying rotation direction in principle; Described level secondary axial swirler on duty 9 blade angles are 25 °～45 °, and lobe numbers is 8～20; Secondary axial swirler 9 vane cyclone setting angles are opposite or identical with one-level axial swirler 8 vane cyclone setting angles.
The expansion angle of described sleeve 10 is 8 °～20 °.
Described main cyclone 11 is radial swirler or axial swirler; Described radial swirler blade angle is 40 °～60 °, and lobe numbers is 12～40; Described axial swirler blade angle is 30 °～70 °, and lobe numbers is 6～48.
The air capacity of described head of combustion chamber accounts for 50%～85% of combustion chamber total air, and wherein main combustion stage accounts for 60%～90% of head air capacity, and pre-combustion grade accounts for 10%～40% of head air capacity.
The cooling employing all standing air film of described burner inner liner 5 is cooling, impact and disperse cooling or other Compound cooling mode, thereby can control the flame tube wall surface temperature, thereby extends burner inner liner service life; Described burner inner liner rear portion is furnished with a plurality of blending hole according to actual needs, thus control combustion chamber outlet temperature distribution.
The course of work of the present invention:
After entering the combustion chamber from the air of high-pressure compressor from diffuser 23, divide afterwards three the tunnel to enter respectively in the combustion chamber ring passage 25, head of combustion chamber and combustion chamber outer ring channel 24, the air of inner and outer rings passage blending hole and the film cooling holes from the burner inner liner 5 respectively enters burner inner liner.In the combustion chamber, burning use gas major part feeds from the head, and other all feeds from burner inner liner with gas, and head of combustion chamber comprises level 1 on duty and main 2.in level 1 on duty, fuel oil (account for total fuel oil 5%～50%) sprays and carries out primary atomization through swirl atomizer 7, be subject to from the shock that is looped around its one-level axial swirler 8 air-flows on every side broken, form secondary-atomizing, following level receipts expansion section on duty 20 outlets is subjected to the shearing-crushing of one-level axial swirler 8 and secondary axial swirler 9 exit flows to carry out three atomizings, gas mixture after blending enters combustor primary zone and carries out the part diffusion combustion, forms the point of safes burning things which may cause a fire disaster, for main, fuel oil (account for total fuel oil 50%～95%) enters main collection chamber 16 from fuel feed pump 15, again respectively through 17 ejections of main fuel oil direct projection spout, can regulate main fuel oil direct-injection type spout spray angle and axial location, regulate main fuel-oil atmozation situation, because main fuel oil direct-injection type spout 17 is arranged in the blade path of main cyclone 11, and because the fuel oil injection direction is mutually vertical or relative with the primary air flow direction, fuel oil is under the main Aerodynamic force action, realize broken, atomizing, enter afterwards main premix ring cavity 22, fuel oil mixes and partly enters the combustion zone after evaporation in the interior continuation of premix ring cavity 22 with air, form lean premixed burning.
The above's preferred specific embodiment of described the present invention by reference to the accompanying drawings only is used for the explanation embodiments of the present invention; rather than as the restriction to aforementioned goal of the invention and claims content and scope; every foundation technical spirit of the present invention all still belongs to the technology of the present invention and rights protection category to any simple modification made for any of the above embodiments, equivalent variations and modification.
Claims (9)
1. the lean premixed preevaporated low contamination combustion chamber of a main fuel direct injection, comprise head of combustion chamber, burner inner liner, ring passage (25) in the combustion chamber, combustion chamber outer ring channel (24), Fuel Injector Bar (21) and casing, Fuel Injector Bar (21) is arranged on casing (6), head of combustion chamber is connected with casing by Fuel Injector Bar (21), and head of combustion chamber, in the combustion chamber, ring passage (25) and combustion chamber outer ring channel (24) distribute the rule design by air mass flow, described Fuel Injector Bar (21) is provided with two oil line pipes of level swirl atomizer (7) on duty and main fuel feed pump (15), it is characterized in that: described head of combustion chamber is circular dicyclo cavity configuration, be divided into level/secondary mould on duty (1) and main/main mould (2) two parts, and described main (2) is looped around the outer shroud of level on duty (1), described level on duty comprises one-level axial swirler (8), secondary axial swirler (9), sleeve (10) and level on duty are received and are expanded section (20), one-level axial swirler (8) and secondary axial swirler (9) rotation direction can be identical also can be opposite, described one-level axial swirler (8) is looped around outside swirl atomizer (7), and secondary axial swirler (9) is looped around the outside of one-level axial swirler (8), connection value class's receipts expansion sections (20) between described one-level axial swirler (8) and secondary axial swirler (9), and level on duty is received and is expanded the exit that section (20) is positioned at one-level axial swirler (8), and sleeve (10) is arranged on the outside of secondary axial swirler (9), main comprises main cyclone (11), main fuel feed pump (15), collection chamber (16), fuel oil direct-injection type spout (17), main is received and is expanded section (12) and main premix ring cavity (22), described main cyclone (11) is looped around the outside of sleeve (10), and Fuel Injector Bar (21), main fuel feed pump (15), collection chamber (16), fuel oil direct-injection type spout (17), main cyclone (11), main premix ring cavity (22) connects successively, and fuel oil direct-injection type spout 17 is arranged in the blade path of main cyclone 11, simultaneously described main is received and is expanded the outlet that section (12) is arranged on main premix ring cavity (22).
2. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 1, it is characterized in that: be provided with ring cooling package (3) in head between described main and level on duty, air encircles in head that in head on cooling package (3), the cooling aperture of ring (18) enters, and impacts cooling to ring shelves splash basins (19) in head; And being provided with head outer shroud cooling package (4) between described main and burner inner liner, the head outer shroud cooling aperture (13) of air on head outer shroud cooling package (4) enters, and impacts cooling to head outer shroud shelves splash basins (14).
3. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 2, it is characterized in that: the blade of described one-level axial swirler (8), level on duty is received the expansion section and is crossed whole machining with the blade pass of secondary axial swirler (9), the mode such as monoblock cast or welding is processed to form, sleeve (10) links with level shelves splash basin (19) on duty and head interior ring cooling package (3) welding, in head, ring cooling package (3) links by welding or links by bolt with main (2), main (2) is welded to each other with head outer shroud cooling package (4) or bolt is connected, main collection chamber and main (2) can interconnect by welding or bolt.
4. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 3, it is characterized in that: the distributed quantity of described fuel oil direct-injection type spout (17) on annulus is 6～36.
5. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 4, it is characterized in that: the eddy flow angle of described level one-level axial swirler on duty (8) is 20 °～45 °, the lobe numbers of one-level axial swirler (8) is 8～16, and the rotation direction of one-level axial swirler (8) blade can be clockwise or counterclockwise along airflow direction, and is opposite with the spraying rotation direction in principle; Described level secondary axial swirler (9) blade angle on duty is 25 °～45 °, and lobe numbers is 8～20; Secondary axial swirler (9) vane cyclone setting angle is opposite or identical with one-level axial swirler (8) vane cyclone setting angle.
6. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 5, it is characterized in that: the expansion angle of described sleeve (10) is 8 °～20 °.
7. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 6, it is characterized in that: described main cyclone (11) is radial swirler or axial swirler; Described radial swirler blade angle is 40 °～60 °, and lobe numbers is 12～40; Described axial swirler blade angle is 30 °～70 °, and lobe numbers is 6～48.
8. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 7, it is characterized in that: the air capacity of described head of combustion chamber accounts for 50%～85% of combustion chamber total air, wherein main combustion stage accounts for 60%～90% of head air capacity, and pre-combustion grade accounts for 10%～40% of head air capacity.
9. the lean premixed preevaporated low contamination combustion chamber of main fuel direct injection according to claim 8, it is characterized in that: the cooling employing all standing air film of described burner inner liner (5) is cooling, impact and disperse cooling or other Compound cooling mode, and described burner inner liner rear portion is furnished with a plurality of blending hole according to actual needs.
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| CN201210589590.7A CN103123122B (en) | 2012-12-31 | 2012-12-31 | The lean premixed preevaporated low contamination combustion chamber that a kind of main fuel oil directly sprays |
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| CN201210589590.7A CN103123122B (en) | 2012-12-31 | 2012-12-31 | The lean premixed preevaporated low contamination combustion chamber that a kind of main fuel oil directly sprays |
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| WO2022193067A1 (en) * | 2021-03-15 | 2022-09-22 | 北京航空航天大学 | Combustion chamber for suppressing combustion oscillation, and combustor |
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