CN106678870A - Three-level rotational flow structure of afterburner head - Google Patents
Three-level rotational flow structure of afterburner head Download PDFInfo
- Publication number
- CN106678870A CN106678870A CN201611006145.8A CN201611006145A CN106678870A CN 106678870 A CN106678870 A CN 106678870A CN 201611006145 A CN201611006145 A CN 201611006145A CN 106678870 A CN106678870 A CN 106678870A
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- support plate
- rectification support
- level
- rectification
- afterburner
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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
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/26—Controlling the air flow
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
The invention provides a three-level rotational flow structure of an afterburner head. A large-ranged recirculation zone can be generated by the structure in an afterburner, so that flame burning is stabilized, and meanwhile, the pressure loss can be reduced, the fuel oil atomization degree in the afterburner is reinforced, burning efficiency is improved, and the wall face can be effectively cooled; by reasonably setting the rotary angle of a whole flow supporting plate, an airflow reversely flows in a rotational-flow mode, so that shear force between fuel oil and air is increased, and the fuel oil atomization degree is improved; the flowing direction of the airflow is not suddenly changed, and thus flowing resistance is small; and an airflow rotational flow is subjected to wall-adherent movement, so that an air film is formed between the afterburner wall face and a burning zone, and the cooling effect of the afterburner wall face is guaranteed. The three-level rotational flow structure of the afterburner head has the advantages that the difficulty, caused by the over-high airflow speed in the afterburner, of igniting and maintaining stable burning of flame can be effectively improved, and the smaller pressure loss is achieved; and meanwhile, the fuel oil atomization level can be improved, and further efficient burning can be ensured.
Description
Technical field
The invention belongs to after-burner field, and in particular to change charge air flow flowing shape in a kind of after-burner
State, produces eddy flow, increases the head construction of after-burner Flame stability range
Background technology
After-burner is combustion gas or combustion gas and oil spout ignition in the gaseous mixture of outer culvert after turbine, to improve gas
Stream temperature, the device for increasing motor power in a short time.When reinforcing is started, the combustion gas after turbine enters afterbunring to fighter plane
Room, and the diffusion that slows down in diffuser first, the fuel oil for then spraying into nozzle blends to form fuel-air mixture.Air-flow Jing turbines
After expansion work, even if Jing diffuser deceleration diffusions, but compared with main chamber, remain that pressure is low, flow velocity is high, be difficult a little
Combustion.Even if light also easily being put out by upstream high velocity air.So flame stabilization measure must be taken to ensure in High Speed Flow Field
With stable incendiary source, the burning of mixed oil and gas in after-burner is able to maintain that.
Traditional after-burner flameholder includes v-stabilizer, standing vortex stabilizer, THE BARCHAN DUNE VORTEX stabilizer, suction
Enter formula stabilizer, preheating type stabilizer, vaporation-type stabilizer etc..Wherein v-stabilizer is most basic flameholder, mostly
The stable mechanism of number stabilizer is all similar with it, and has developed various improved forms on this basis and strengthened the structure side of performance
Case.V-shaped groove flameholder belongs to one kind of bluff body flameholder, and after bluff body, air-flow is divided high velocity air
Two strands of field, in the afterbody of bluff body low-pressure area is formed, and so as to produce adverse pressure gradient, will so cause airflow reflux, and then is produced
Recirculating zone, air velocity is reduced, so as to the stability for ensureing to burn.
Because V-shaped groove flameholder working range is narrower, and pitot loss is larger in the flow field of high speed, afterbunring
Using the design that rectification support plate is integrated with flameholder in room, conventional force flame combustion chamber stabilizer can be cancelled,
The flow resistance loss under non-reinforcing " cold conditions " will be greatly reduced, can effectively reduce the volume and length of flameholder, be shortened
After-burner length, reduces additional mass, improves the thrust-weight ratio of engine.
The design of rectification support plate be generally vertically with reinforcing inner cone wall, and parallel with air flow direction, i.e. rectification support plate
Without angle between air flow direction, air-flow does not change from rectification support plate into airflow direction during afterbunring chamber interior.
Air-flow produces low-pressure area in the cavity of rectification support plate afterbody, local return area is formed, so as to stablize flame combustion.Due to rectification
The size of support plate is limited, therefore the recirculating zone size that the cavity of rectification support plate afterbody is provided is limited.This secondary design it is integrated whole
Stream support plate structure, has innovated in the design of after-burner head construction, increases two-stage rectification support plate structure, changes reinforcing combustion
Chamber-head portion air flow state is burnt, so as to improve the recirculating zone size in afterbunring room, increases the space of stable burning, improved
After-burner combustion stability and efficiency of combustion.
The content of the invention
The technical problem to be solved in the present invention is that after-burner head can produce the three of swirling eddy increase recirculating zone
Level swirling inlet structure.Compared with prior art, the invention mainly carries out classification and installs rectification support plate additional in after-burner head,
Air-flow is entered after after-burner by passage not at the same level, produces eddy flow, and in after-burner, air-flow is by being classified rectification
After support plate, moved to combustor tail with the rotation mode of spiral involute, so that after-burner center produces back
Stream, therefore, it is possible to the region of the stable burning of effectively increase, it is ensured that the combustion stability and efficiency of combustion of after-burner.
Technical scheme
It is an object of the invention to provide a kind of after-burner head three swirler structure.
The object of the present invention is achieved like this：
After-burner entry position adopts three-level rectification support plate, wherein one or two grades of rectification support plate rotation directions are identical, it is suitable respectively
Hour hands rotate 30 ° and 35 °, 30 ° of third level rectification support plate rotate counterclockwise.Three-level rectification support plate total height accounts for after-burner and enters
The 1/3~1/2 of open height.The height of three-level rectification support plate is assigned as：The first order, second level rectification support plate highly account for rectification support plate
Total height 1/3~2/5, third level rectification support plate highly accounts for rectification support plate total height 1/3~1/5, wherein, third level rectification support plate
Height be less than the first order and the second collection rectification support plate height.First order rectification support plate axial length is 250mm~300mm,
Second level rectification support plate axial length is 450mm~500mm, and one or two grades of rectification support plate original positions are located at after-burner import
Position.Third level rectification support plate axial length is 450mm~500mm, and it is whole that third level rectification support plate original position is located at the first order
Stream support plate afterbody.
Rectification support plate blade profile adopts streamlined design, global shape to be similar to sub warhead.Rectification plate thickness be 40mm~
50mm, wherein blade profile are symmetrical curve, and wherein side curve is the minor arc part of the circular arc that radius is 2000mm~2500mm.It is whole
Stream support plate nose curve is the minor arc part of the circular arc that radius is 2mm, and it is 20mm~30mm circular arcs that rectification support plate afterbody is radius
Minor arc part.Rectification support plate is uniformly distributed in after-burner in circumferential, the 12 rectification support plates of distribution in a week.
Following beneficial effect can use to obtain using the present invention：
1. the present invention can effectively be changed into reinforcing combustion using the after-burner head construction of multi-stage rectifying support plate
Burn the flow regime of room air-flow.Multi-stage rectifying support plate carries certain angle, revolves can the air-flow that enter after-burner
Turn, air-flow is rotationally advancing in after-burner, and gradually can make afterbunring Shi Nei centers to the diffusion of after-burner wall
Part produces low-pressure area such that it is able to produce recirculating zone at after-burner center such that it is able to air-flow velocity is greatly reduced, carries
For the region of stable burning.
2. air-flow is oppositely oriented between the second level and third level rectification support plate, so as to be entered by the second level and third level rectification support plate
Larger shearing force can be produced between the air for entering, so that fuel oil can faster carry out primary atomization process.Meanwhile, drop
While atomization, blended with the air-flow of rotation, atomization and vaporization is further occurred such that it is able to accelerate fuel-oil atmozation
Journey, improves the uniformity coefficient that fuel oil mixes with air such that it is able to ensure higher efficiency of combustion and combustion stability.
3. three-level rectification support plate is more compared with single stage power conversion support plate air inflow, therefore the tolerance of abundance ensure that burning is abundant
Carrying out, efficiency of combustion can effectively improve.
4. when into after-burner, air motion track is gradually to open helix to air after rectification support plate, therefore
The passage that more air are entered between Shockproof heat insulation screen and after-burner wall is had, therefore the present invention can lift reinforcing combustion
Burn the wall cooling effect of room.
Description of the drawings
Fig. 1：Three swirler head stereoscopic figure；
Fig. 2：Three swirler head lateral view；
Fig. 3：The positive figure of three swirler head；
Fig. 4：After-burner overall diagram；
Fig. 5：Rectification support plate sectional view
In Fig. 4：1- first order rectification support plates, 2- second level rectification support plate, 3- third level rectification support plates
Specific embodiment
In conjunction with accompanying drawing, the invention will be further described：
With reference to Fig. 1, Fig. 2 and Fig. 3, the invention provides one kind can change inlet air flow flowing shape in after-burner
State, improves the three-level rectification support plate structure of combustion stability and efficiency of combustion in after-burner.Fig. 1 is three-level rectification support plate
Stereogram, Fig. 2 is rectification support plate lateral view, and Fig. 3 is the positive figure of rectification support plate, it can be clearly seen that the height of three-level rectification support plate
Distribution.Fig. 4 is the structure chart of whole after-burner.
In after-burner, due to charge air flow speed soon, and pressure is relatively low, lights a fire and maintain the stable burning of flame
Room is very difficult, and this is accomplished by installing flame stabilizer additional in after-burner to reduce air velocity, so as to ensure flame
Do not put out by high velocity air, while being able to maintain that the sustained combustion of flame.In traditional after-burner, typically using V-arrangement
The bluff body flameholder of the deformed shape of groove or V-shaped groove, takes bluff-body stabilized flame to cause excessive pitot loss.Together
When, the flame-stabilizing area domain of V-shaped groove flameholder is less, so to ensure to be burnt in flame stabilization interior on a large scale, often arranging
Multiple rows of V-shaped groove flameholder, this will cause bigger pitot loss, be unfavorable for that what is burnt is fully carried out.Take three-level rectification
Support plate structure, can on the whole change the internal flow state of after-burner such that it is able to produce large-scale recirculating zone,
Increase the scope of flame stabilization.Meanwhile, with reverse rectification support plate the air stream shear forces between two-stage rectification support plate can in the same direction increased
Plus, strengthen the process of broken atomization and the blending of fuel oil such that it is able to ensure fully carrying out for burning.
Air-flow is entered after after-burner, and after rectification support plate, air flow state changes, wherein by first
Level (1 and 2 in Fig. 4) identical with the air-flow rotation direction of second level rectification support plate, wherein 5 ° of anglec of rotation difference, first order rectification support plate
Air inflow is less with respect to second level rectification support plate.Third level rectification support plate (3 in Fig. 4) revolves with the first order and second level rectification support plate
To contrary.In after-burner overall structure shown in Fig. 4, air-flow after the first order and second level rectification support plate, air-flow spiral shell
Rotation is advanced so that after-burner near wall air velocity it is high and central gas stream speed is low, adherent swirling eddy pair
The air at center has Involving velocity so that after-burner center pressure is low, and after-burner rear portion is rotated
The Involving velocity of air-flow is weaker, therefore pressure is of a relatively high, so that forming negative sequence harmonic in after-burner, and then is adding
Power combustion chamber middle part produce recirculating zone ensure flame stable burning, air-flow after third level rectification support plate, rotation direction with pass through
The air-flow of second level rectification support plate is conversely, therefore can produce larger shearing force so as to accelerate the primary atomization journey of fuel oil
Degree, meanwhile, air-flow presses close to the motion of after-burner wall after third level rectification support plate, therefore can be in after-burner
Wall position forms air film such that it is able to play a part of to cool down after-burner wall.
Claims (4)
1. after-burner head three swirler structure, it is characterised in that：Afterbunring chamber inlet rectification support plate is divided into three-level, its
Middle three-level rectification support plate highly accounts for the 1/3~1/2 of afterbunring chamber inlet total height.The height of three-level rectification support plate is assigned as：
The first order, second level rectification support plate highly account for rectification support plate total height 1/3~2/5, and third level rectification support plate highly accounts for rectification
Plate total height 1/3~1/5, wherein, the height of third level rectification support plate is less than the first order and second level rectification support plate height.
2. after-burner head three swirler structure according to claim 1, it is characterised in that：Three-level rectification support plate revolves
Gyration is different, and wherein first order rectification support plate turns clockwise 30 °, and second level rectification support plate turns clockwise 35 °, the third level
Rectification support plate is oppositely oriented with the first order and second level rectification support plate, is 30 ° of rotate counterclockwise.
3. after-burner head three swirler structure according to claim 1, it is characterised in that：First order rectification support plate
Axial length is：First order rectification support plate axial length is 250mm~300mm, and second level rectification support plate axial length is 450mm
~500mm, one or two grades of rectification support plate original positions are located at after-burner entrance location；Third level rectification support plate axial length is
450mm~500mm, third level rectification support plate original position is located at first order rectification support plate afterbody.
4. the after-burner head three swirler structure according to claim 1,2 or 3, it is characterised in that：Three-level rectification
Support plate blade profile adopts airflow design, and its global shape is similar to bullet.Rectification plate thickness is 40mm, and wherein blade profile is symmetrical bent
Line, wherein side curve are the minor arc part of the circular arc that radius is 2000mm~2500mm.Rectification support plate nose curve is radius
For the minor arc part of the circular arc of 2mm, rectification support plate afterbody is the minor arc part that radius is 30mm circular arcs.Rectification support plate is in reinforcing combustion
Burn in room and be uniformly distributed in circumferential, the 12 rectification support plates of distribution in a week.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611006145.8A CN106678870A (en) | 2016-11-16 | 2016-11-16 | Three-level rotational flow structure of afterburner head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611006145.8A CN106678870A (en) | 2016-11-16 | 2016-11-16 | Three-level rotational flow structure of afterburner head |
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| Publication Number | Publication Date |
|---|---|
| CN106678870A true CN106678870A (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611006145.8A Pending CN106678870A (en) | 2016-11-16 | 2016-11-16 | Three-level rotational flow structure of afterburner head |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112303664A (en) * | 2020-10-26 | 2021-02-02 | 西北工业大学 | Integrated afterburner of preheating double-oil-way annular flame stabilizer |
| CN113310071A (en) * | 2021-06-16 | 2021-08-27 | 哈尔滨工程大学 | Coaxial staged combustor for low-pollution combustion chamber of gas fuel gas turbine |
| CN115200038A (en) * | 2022-07-21 | 2022-10-18 | 中国航发沈阳发动机研究所 | Afterburner adopting air-cooled serial support plate for rectification |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112303664A (en) * | 2020-10-26 | 2021-02-02 | 西北工业大学 | Integrated afterburner of preheating double-oil-way annular flame stabilizer |
| CN113310071A (en) * | 2021-06-16 | 2021-08-27 | 哈尔滨工程大学 | Coaxial staged combustor for low-pollution combustion chamber of gas fuel gas turbine |
| CN115200038A (en) * | 2022-07-21 | 2022-10-18 | 中国航发沈阳发动机研究所 | Afterburner adopting air-cooled serial support plate for rectification |
| CN115200038B (en) * | 2022-07-21 | 2023-08-22 | 中国航发沈阳发动机研究所 | Afterburner adopting air-cooled serial support plates for rectification |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170517 |
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| RJ01 | Rejection of invention patent application after publication |