CN102607061B - The flame stabilizer that a kind of geometry is variable - Google Patents
The flame stabilizer that a kind of geometry is variable Download PDFInfo
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- CN102607061B CN102607061B CN201210082409.3A CN201210082409A CN102607061B CN 102607061 B CN102607061 B CN 102607061B CN 201210082409 A CN201210082409 A CN 201210082409A CN 102607061 B CN102607061 B CN 102607061B
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Abstract
The invention discloses the flame stabilizer that a kind of geometry is variable, belong to aeroengine thrust augmentation flame combustion chamber stabilization technique field.The present invention is basic bluff body structure with V-type, be made up of main part and transfer motion power part, main part is installed vertically in after-burner casing, comprise the streamlined head in front, be with the blade A of rotating shaft A, the blade B being with rotating shaft B, rotating shaft support plate and mount pad, the two ends of streamlined head are fixedly connected between mount pad and rotating shaft support plate.By the change of flame stabilizer geometry provided by the invention, when needs, can effectively reduce its flow resistance; Or with short-term increase flow resistance for cost improves ignition success rate; Or regulate the geometry of flameholder with the best joint making it remain at flame stabilization and flow resistance loss in real time, to obtain the maximum thrust performance of after-burner.
Description
Technical field
The invention belongs to aeroengine thrust augmentation flame combustion chamber stabilization technique field, the flame stabilizer that a kind of geometry is variable specifically.
Background technology
After-burner technology becomes with the feature that it increases turbojet thrust in a short time the important means that engine increases thrust-weight ratio, and the engine with after-burner is widely used on various military aircraft, to improve its mobility.The gaseous-pressure of discharging after turbine in after-burner reduces greatly, speed improves, flowing extremely unstable, needs flame stabilizer to carry out the stable tissue with burning of flame.Traditional after-burner almost all adopts the flameholder of bluff body structure, in high velocity air, form recirculating zone make part fire high-temperature combustion product to produce reflux movement (namely with carry out flow path direction contrary) as the constant ignition source with auto-compensation ability, constantly to light the fresh flammable mixture do not fired, thus reach the object stabilized the flame.The design of development to flameholder of modern aeroengine technology is had higher requirement, the condition range of flameholder is than broader in the past, for the bluff body flameholder that after-burner adopts, make that it keeps optimum igniting in whole working range, steady flame, combustibility and minimum flow resistance loss are a very large design challenge.
On the other hand, when only having aircraft to carry out needing the motor-driven of high thrust and supersonic flight, the after-burner of the turbojet loaded just enters duty.When after-burner works, its flame stabilizer to bring flow losses to depend on be stabilize the flame the cost that must pay, but when after-burner does not work, the flow resistance loss that its flame stabilizer brings is useless completely, can only bring the reduction of thrust, flow resistance should be reduced to minimum by desirable flame stabilizer when not working.Therefore, being reduced in the flow resistance of after-burner flame stabilizer under " non-reinforcing " state is an important research direction of flameholder design.
In various bluff body flameholder, modal is V-flame stabilizer, and the cross section of V-flame stabilizer is V-shaped, and its structure and steady flame principle schematic are as shown in Figure 1.When combustion gas at a high speed mix gas 2 flow through V-arrangement bluff body 1 time, due to the effect of gas viscosity power, the air-flow in the hidden region after bluff body 1 is taken away, forms local depression district.Thus make bluff body 1 downstream part fraction under the effect of pressure differential, flow to the fallback area after bluff body 1 with the flow direction contrary with primary air, to keep the continuity flowed.Like this, recirculating zone 3 is created at bluff body 1 rear.Recirculating zone 3 is basic guarantees that bluff body stabilizer stabilizes the flame 4, and generally recirculating zone 3 length is larger, and its steady flame effect is better.And when blockage ratio one timing, recirculating zone 3 length L and stabilizer trailing edge width D are approximated to proportional relation, and the increase of trailing edge width D can make front face area increase, flow resistance increases.Because structure is very simple, easy for installation, therefore V-flame stabilizer is widely used in after-burner and punching engine.
In order to meet the ignition performance particularly high-altitude ignition performance of after-burner, this V-flame stabilizer needs higher flowing blockage ratio, and this causes higher flow resistance loss.Meanwhile, because V-flame stabilizer is installed in combustion chamber with fixing geometry, when after-burner does not work, larger useless flow losses can be brought.
Double V-shaped flameholder is the improvement project of V-flame stabilizer, as shown in Figure 2, its height is all substantially identical with general v-shaped stabilizer with width, difference is: except main stabilizer 6, a little stabilizer 5 is had at leading edge place, by the intussusception of size stabilizer, define twice air inlet gap at head.Recirculating zone structure after two V and general v-shaped flameholder as shown in Figure 3, compare with general v-shaped flameholder, the air flow structure of double V-shaped flameholder there occurs change: it is made up of two strands of air-flows, one is to bypass the main flow 7 of main stabilizer 6, and one is to bypass little stabilizer 5, flows into the pre-burning stream 8 of main stabilizer 6 inside.Recirculating zone after air flow structure change makes flameholder also there occurs change.It is inner that double V-shaped flameholder introduces main stabilizer 6 a small amount of pre-burning stream 8, and form a little recirculating zone, the large recirculating zone after general v-shaped flameholder still exists.When the width that cracks is 2.8mm, two combine into one in size recirculating zone, becomes a narrow and long large recirculating zone 9, extend to stabilizer downstream from stabilizer inside.Center of vorticity is in main stabilizer 6, and point of safes burning things which may cause a fire disaster is little stabilizer 5 trailing edges in main stabilizer 6, and flame 10 relies on the high-temperature product of pre-burning in stabilizer to enter recirculating zone and maintains.The design of this stabilizer is by certain type turbojet engine after-burner is adopted, and performance on probation shows that this stabilizer has that ignition performance is good, flow losses are little, efficiency of combustion advantages of higher.
Double V-shaped flameholder is under certain incoming flow parameter, the gap width that best flow field and size recirculating zone are combined into a recirculating zone can be formed to one should be had, but the working condition of engine is change, so can not ensure that the flow field after stabilizer is best always.Equally, the geometry of double V-shaped flameholder is fixed, and when after-burner does not work, can bring larger useless flow losses.
Summary of the invention
The flame stabilizer that the object of the invention is to solve fixed geometirc structure in existing after-burner flame stabilization technology can not keep the optimum steady flame performance of burning and the problem of flow resistance loss under different operating state, proposes the flame stabilizer that a kind of geometry is variable.
In existing after-burner flame stabilization technology, the bluff body flame stabilizer of fixed geometirc structure can not keep optimum steady flame performance and the problem of flow resistance loss under different operating state, the present invention proposes the variable flame stabilizer of a kind of geometry, solves above-mentioned technical problem by the geometry changing stabilising arrangement.
The variable flame stabilizer of geometry provided by the invention is basic bluff body structure with V-type, be made up of main part and transfer motion power part, main part is installed vertically in after-burner casing (18), described main part comprises the streamlined head in front (11), the blade A (12) of band rotating shaft A (16), the blade B (13) being with rotating shaft B (17), rotating shaft support plate (14) and mount pad (15), and the two ends of streamlined head (11) are fixedly connected between mount pad (15) and rotating shaft support plate (14); Described rotating shaft A (16) and the two ends of rotating shaft B (17) are each passed through the installing hole on mount pad (15) and rotating shaft support plate (14); Described mount pad (15) is fixedly connected with after-burner casing (18).Mount pad (15) one end countershaft A (16) and rotating shaft B (17) carry out rotating shaft axial limiting, and rotating shaft support plate (14) end keeps rotating shaft axially freely.
The present invention is owing to taking above technical scheme, and it has the following advantages:
(1) when after-burner does not work, by the change of flame stabilizer geometry, its flow resistance can effectively be reduced.
(2) when after-burner carries out high-altitude ignition, flow resistance can be increased by the change of flame stabilizer geometry with short-term and improve ignition success rate for cost.
(3) when after-burner is operated in large condition range, can pass through to regulate the geometry of flameholder with the best joint making it remain at flame stabilization and flow resistance loss in real time, to obtain the maximum thrust performance of after-burner.
(4) this geometry variable flame stabilising arrangement structure is simple, assembly is few, and realizability is strong, reliability is high.
Accompanying drawing explanation
Fig. 1 is V-flame stabilizer structure of the prior art and steady flame principle schematic;
Fig. 2 is double V-shaped flameholder structural representation in prior art;
Fig. 3 is the steady flame principle comparison diagram of double V-shaped flameholder and V-flame stabilizer;
Fig. 4 is the structural representation of geometry variable flame stabilizer provided by the invention;
Fig. 5 is geometry variable flame stabilizer operation principle schematic diagram provided by the invention;
Fig. 6 is the installation side view of geometry variable flame stabilizer provided by the invention;
Fig. 7 a and 7b is the moving vane open and close view of geometry variable flame stabilizer provided by the invention;
Fig. 8 is the motion schematic diagram of the actuating unit in the present invention, the top view after the unilateral expansion of mechanical outside wall surface;
Fig. 9 is the variable installation diagram of flame stabilizer testpieces on rectangular test platform of geometry of the present invention;
Figure 10 is the variation relation curve of flow resistance coefficient ψ with stabilizer trailing edge groove width D.
In figure:
1. bluff body; 2. combustion gas mixes gas; 3. recirculating zone; 4. stabilize the flame; 5. main stabilizer; 6. little stabilizer; 7. main flow; 8. pre-burning stream; 9. large recirculating zone; 10. flame; 11. heads; 12. blade A; 13. blade B; 14. rotating shaft support plates; 15. mount pads; 16. rotating shaft A; 17. rotating shaft B; 18. casings; 19. combustion gas incoming flows; 20. connection rod set; 21. power connecting rings; 22. hydraulic actuators; 23. turbine rear center cones; 24. rectangular test platforms.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Geometry variable flame stabilising arrangement provided by the invention, as shown in Figure 4, Figure 5, is specially:
Geometry variable flame stabilising arrangement provided by the invention is basic bluff body structure with V-type, is made up of stabilizer body part and transfer motion power part.Stabilizer body part as shown in Figure 4, comprise the streamlined head 11 in front, be with the rear moving vane A12 of rotating shaft A16, the rear moving vane B13 being with rotating shaft B17, rotating shaft support plate 14 and mount pad 15, the two ends of streamlined head 11 are fixedly connected between mount pad 15 and rotating shaft support plate 14.Described rotating shaft A16 and the two ends of rotating shaft B17 are each passed through the installing hole on mount pad 15 and rotating shaft support plate 14, only carry out rotating shaft axial limiting at mount pad 15 one end countershaft A16 and rotating shaft B17, rotating shaft support plate 14 end keeps rotating shaft axially freely, can avoid the stuck phenomenon that rotating shaft causes due to thermal expansion during variations in temperature on a large scale like this.The steady flame partial cross section of stabilizer body as shown in Figure 5, when A16 and rotating shaft B17 rotates with direction shown in Fig. 5 (a) blade A12 and blade B13 around the shaft respectively, trailing edge width D reduces, reflux area length reduces, steady flame performance reduces, but the front face area of stabilising arrangement reduces, flow resistance in the gas flow reduces.When the trailing edge of blade A12 and blade B13 contacts with each other, stabilizer cross section becomes accurate streamlined geometry, and as shown in Fig. 5 (b), now stabilizer has minimum flow resistance.When A16 and rotating shaft B17 rotates with direction shown in Fig. 5 (b) blade A12 and blade B13 around the shaft respectively, trailing edge width D increases, reflux area length increases, steady flame performance enhancement, but because front face area increases, then flow resistance in the gas flow increases, and the maximum of trailing edge width D is determined by engine augmentor actual size and concrete operating mode.The Breadth Maximum H of the streamlined head 11 in front is determined by the distance of two rotating shafts, and be the smaller the better in theory, in actual design, the installation that rotating shaft spacing is subject to rotating shaft diameter and transmission mechanism restricted, but Breadth Maximum H should be not more than 25mm.The width W of blade A12 and blade B13 is determined by actual demand, generally should select between 20mm to 40mm.Fig. 6 and Fig. 7 is the scheme of installation of this stabilising arrangement in after-burner, and Fig. 8 is actuating unit motion schematic diagram, is the top view after casing 18 outside wall surface planar development.Below in conjunction with these 3 accompanying drawings, the mounting means of stabilizer body part and actuating unit are described.Flame stabilizer main part is installed vertically in after-burner casing 18, and as shown in Figure 6, mount pad 15 is fixedly connected with after-burner casing 18, and stabilising arrangement rotating shaft A16, B17 are vertical with casing 18, and streamlined head 11 is just to combustion gas incoming flow 19 direction.Will along several flame stabilizers of the present invention of after-burner casing 18 circumference uniform distribution in practical application, quantity is determined by actual demand, sees Fig. 7.The transfer motion power part of this flame stabilizer is arranged on outside casing 18, be made up of connection rod set 20, power connecting ring 21 and hydraulic actuator 22, hydraulic actuator 22 drives power connecting ring 21 to do translational motion, and translation is converted to rotational motion and drives the rotating shaft of stabilising arrangement moving vane A16, B17 carry out corresponding rotational action thus change stabilising arrangement trailing edge width D by connection rod set 20.Fig. 7 (a) is stabilising arrangement blade open mode, and Fig. 7 (b) is stabilising arrangement blade closure state, and wherein 23 is engine turbine rear center cones.
Preferably, each transfer motion power part is for controlling the blade rotation of two the stable main parts be adjacent.
At rectangular test platform, the simulated test research of single cold conditions flow resistance is carried out to above-mentioned flame stabilizer testpieces, the installation of stabilizer as shown in Figure 9, the cross section of rectangular test platform 24 is wherein 170mm (x) × 150mm (y), H=24mm, W=30mm are chosen in the design of flame stabilizer testpieces, and the excursion of D is 13mm ~ 48mm.Test is carried out at normal temperatures and pressures, and the free stream Mach number chosen is 0.1,0.19 and 0.28, and result of the test as shown in Figure 10.In figure, ordinate ψ is flow resistance coefficient, and the flow resistance that flow resistance coefficient less explanation stabilizer brings is less; Abscissa D is stabilizer groove width.Can obtain drawing a conclusion from result of the test: flow resistance coefficient reduces along with the reduction of trailing edge groove width, and when trailing edge groove width is reduced to 13mm from 48mm, flow resistance coefficient is reduced to 0.37 from 0.85, and flow resistance characteristic obtains to be improved significantly.
Claims (4)
1. the flame stabilizer that a geometry is variable, it is characterized in that: described flame stabilizer is basic bluff body structure with V-type, be made up of main part and transfer motion power part, main part is installed vertically in after-burner casing (18), described main part comprises the streamlined head in front (11), the blade A (12) of band rotating shaft A (16), the blade B (13) of band rotating shaft B (17), rotating shaft support plate (14) and mount pad (15), the two ends of streamlined head (11) are fixedly connected between mount pad (15) and rotating shaft support plate (14), described rotating shaft A (16) and the two ends of rotating shaft B (17) are each passed through the installing hole on mount pad (15) and rotating shaft support plate (14), described mount pad (15) is fixedly connected with after-burner casing (18).
2. the flame stabilizer that a kind of geometry according to claim 1 is variable, it is characterized in that: mount pad (15) one end countershaft A (16) and rotating shaft B (17) carry out rotating shaft axial limiting, rotating shaft support plate (14) end keeps rotating shaft axially freely.
3. the flame stabilizer that a kind of geometry according to claim 1 is variable, it is characterized in that: rotating shaft A (16), B (17) are vertical with casing (18), streamlined head (11) is just to combustion gas incoming flow (19) direction.
4. the flame stabilizer that a kind of geometry according to claim 1 is variable, it is characterized in that: transfer motion power part is arranged on casing (18) outward, be made up of connection rod set (20), power connecting ring (21) and hydraulic actuator (22), hydraulic actuator (22) drives power connecting ring (21) to do translational motion, and translation is converted to rotational motion drive shaft A (16) by connection rod set (20), B (17) carries out corresponding rotational action thus change stabilising arrangement trailing edge width D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210082409.3A CN102607061B (en) | 2012-03-26 | 2012-03-26 | The flame stabilizer that a kind of geometry is variable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210082409.3A CN102607061B (en) | 2012-03-26 | 2012-03-26 | The flame stabilizer that a kind of geometry is variable |
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| CN102607061A CN102607061A (en) | 2012-07-25 |
| CN102607061B true CN102607061B (en) | 2016-03-02 |
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| CN201210082409.3A Expired - Fee Related CN102607061B (en) | 2012-03-26 | 2012-03-26 | The flame stabilizer that a kind of geometry is variable |
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| CN114151826A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Variable geometry combustion chamber |
| CN115127118B (en) * | 2022-06-17 | 2023-12-22 | 江苏科技大学 | V-shaped flame stabilizer with guide plate |
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| US5768886A (en) * | 1995-09-29 | 1998-06-23 | National Science Council | Twin-plate flameholder construction |
| JP2006242399A (en) * | 2005-02-28 | 2006-09-14 | Mitsubishi Heavy Ind Ltd | Combustion equipment and combustion method by combustion equipment |
| CN101334174A (en) * | 2008-06-19 | 2008-12-31 | 北京航空航天大学 | V -type cone flame holder for rotor engine |
| CN101776283A (en) * | 2009-01-13 | 2010-07-14 | 北京航空航天大学 | Flame stabilizer with jet injection |
| CN102200292A (en) * | 2010-03-26 | 2011-09-28 | 北京航空航天大学 | Flame stabilizing device and method for supporting plate with cavities |
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2012
- 2012-03-26 CN CN201210082409.3A patent/CN102607061B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5768886A (en) * | 1995-09-29 | 1998-06-23 | National Science Council | Twin-plate flameholder construction |
| JP2006242399A (en) * | 2005-02-28 | 2006-09-14 | Mitsubishi Heavy Ind Ltd | Combustion equipment and combustion method by combustion equipment |
| CN101334174A (en) * | 2008-06-19 | 2008-12-31 | 北京航空航天大学 | V -type cone flame holder for rotor engine |
| CN101776283A (en) * | 2009-01-13 | 2010-07-14 | 北京航空航天大学 | Flame stabilizer with jet injection |
| CN102200292A (en) * | 2010-03-26 | 2011-09-28 | 北京航空航天大学 | Flame stabilizing device and method for supporting plate with cavities |
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