CN108426267A - A kind of folding V-type bluff body eddy flameholder - Google Patents
A kind of folding V-type bluff body eddy flameholder Download PDFInfo
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- CN108426267A CN108426267A CN201810450776.1A CN201810450776A CN108426267A CN 108426267 A CN108426267 A CN 108426267A CN 201810450776 A CN201810450776 A CN 201810450776A CN 108426267 A CN108426267 A CN 108426267A
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- bluff body
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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
- F23R3/16—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
- F23R3/18—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- General Engineering & Computer Science (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
The invention discloses a kind of folding V-type bluff body eddy flameholders, belong to Thermal Energy and Power Engineering field, by the same or similar folding V-type bluff body eddy flameholder combination of monomers of several groups structure at, each flameholder monomer include two cross-sections, etc. the aerofoils of spanwise lengths angularly α is welded, or be directly prepared by high temperature alloy increasing material manufacturing；Combining form is radial, and circumferentially, or radial direction is mixed with circumferential.When work, incoming volume takes fuel and flows through two aerofoils, and fluid forms a pair in plane V-type bluff body downstream and flows to vortex, and incoming flows from the rim openings of two aerofoils to the central plane direction of two aerofoils, forms the vortex extended to distribution；It flows to vortex and opens up to the vortex of distribution and form a pair of of standing vortex in downstream, igniter is arranged in standing vortex center.Flame keeps stablizing, and it is wide to put out boundary, and total pressure recovery coefficient is high；It is easy to have model with aero-engine and is matched, improves existing aero-engine performance.
Description
Technical field
The invention belongs to Thermal Energy and Power Engineering field, specifically a kind of folding V-type bluff body eddy flameholder.
Background technology
After-burner is that military aviation gas-turbine unit is different from one of important feature of civil engine,
It is come further by being burnt using the uncombusted oxygen tissue regnition of main chamber in aero-engine jet pipe upstream
The fuel gas temperature and combustion gas speed that nozzle sprays are promoted, the motor power in the short time is made to be increased dramatically.
After-burner can improve opportunity of combat mobility comprehensively and expand flight envelope to improve airplane thrust weight ratio in the short time
(ceiling can be increased to 22~23km, maximum flight Mach number is increased to 2.5~3) promotes opportunity of combat short takeoff, system sky, cuts
Hit, critical capabilities, the performance such as prominent anti-and escape also directly influence the limiting performance of the weaponrys such as opportunity of combat, guided missile, often
In several minutes of afterbunring unlatching or even several seconds, it will just determine opportunity of combat and the final and decisive juncture of pilot, and determine guided missile
Prominent anti-success or failure and hit rate.However also just since after-burner is worked in always near Engine Limit operating mode, building ring
Border is also that engine thermal end pieces conditional one of is the most badly located, and severe operating mode gives aeroengine thrust augmentation Combustion chamber design
The matter of utmost importance brought is exactly combustion instability sex chromosome mosaicism.Such as bibliography [1]：《Combustion instability simulating experiment technique》；
Zhang Mengzheng writes, publishing house of Northwestern Polytechnical University, by the combustion instability of after-burner to be similar to the oscillation of acoustic resonance type
Form, be divided into low frequency, intermediate frequency and high-frequency combustion instability according to frequency.
Combustion instability in afterbunring room is other than leading to flame oscillation quenching (extinct), it is also possible to cause 1.
Combustion chamber part thermal force improves, and causes structural material deformation, ablation even entirely ineffective；2. the overload that flame pulsation generates carries
Lotus causes mechanical damage；3. causing engine performance off-design point, thrust big ups and downs will such as takeoff phase burning unstability
Cause thrust rapid drawdown, fatal crass serious accident；4. giving nozzle (the especially vectored thrust spray of new work engine
Pipe) it accurately controls and brings difficulty.Therefore, installation and engine design performance, design must be rationally designed in afterbunring room
The flameholder that operating mode matches, to ensure still to be able to preferably tissue igniting under severe conditions, stablize and burn.
The structure and layout of flameholder determine the ignition performance of after-burner, flame stabilization performance, burning effect
Rate and flow resistance also therefore promote the burning comprehensive performance of flameholder, reduce the resistance of flameholder, it will be able to
The performance for directly promoting after-burner, to improve the overall performance of engine.
If U.S. YF-120 is when prototype is researched and developed, it is big to overcome after-burner for the new method designed using three-dimensional flow
The problem of amount is easy to cause combustion oscillation using radial stabilizer, it is proposed that it is a kind of it is based on radial flameholder, in
The after-burner that thimble shape V-arrangement stabilizer and 12 root diameters are composed to stabilizer surely fires scheme；Bibliography [2]：《Aviation
Engine structure design analysis》, Chen Guangzhu.
The most common bluff body structure of military aero-engine after-burner flameholder is V-arrangement bluff body at present, i.e.,
The two-dimensional cell body structure of flameholder is v-shaped structure, and according to actual demand, in the axial direction draws two-dimentional V-arrangement cell cube
It is stretched into three-dimensional flameholder cell cube, finally by certain combining form, by these three-dimensional flameholder cell cubes
It is combined as the combination of annular flame stabilizer, radial flameholder or annular and radial direction, is practically used for forming flame on duty
Vapor flame holder can also regard a kind of V-arrangement bluff body of built-in oil gas jets as.
But the shortcomings that V-arrangement bluff body, is also very clear, i.e., the pitot loss of non-Afterburning condition is big, and flame holding is only by next
Oil-gas ratio control is flowed, igniting oil-gas ratio is high, and oil-poor stable combustion range is relatively narrow, and high-altitude goes booster poor reliability, flame stabilization
Wall temperature is uneven, is also easy to produce malformation etc..The simple modifications of early stage are to use gap V-type (double V-shaped) bluff body thus
Structure, bibliography [3]：The development of the double V-shaped flameholders of Zhang Hongbin, Wang Ji root and application [J] Push Technologies, 1994,
15(3):38-43.), double v-shaped flame stabilizers are almost the same with v-shaped flame stabilizer in terms of main design parameters, difference
The leading edge being in double v-shaped flame stabilizers increases a smaller V-arrangement stabilizer, passes through the set of size flameholder
It is folded, head formed twice one fixed width into air cleft.
Compared with v-shaped flame stabilizer, the air flow structure of double v-shaped flame stabilizers is changed：It is by two strands of air-flows
It is formed, one is to bypass the mainstream of main stabilizer, one is to bypass small stabilizer, flows into the pre-burning stream inside main stabilizer.
This two plume is dynamic to form respectively large and small two recirculating zones, and by the interaction of two recirculating zones, ultimately forms narrow and long
Big recirculating zone, the center of vorticity of this recirculating zone in main stabilizer, and igniter be arranged in main stabilizer, small stabilizer rear
Neighbouring position, flame is by the principle maintained as v-shaped flame stabilizer --- non-fuel vapor is involved in by recirculating zone
Fire region, it is ensured that combustion process continues.
The improvement maximum compared to v-shaped flame stabilizer of double V flameholders is reduction of blockage ratio and pitot loss, for
The other shortcomings of v-shaped flame stabilizer then improve a kind of limited, substantially to optimize closer to head vaporation-type flame stabilization
Device.At the same time, double V flameholders increase the complexity in structure and consequently lead to reduction and the structure weight of reliability
The increase of amount, this is then a kind of retroversion for the overall development trend of flameholder.So far to bluff body structure fire
Flame stabilizer is the most bold, radical and successful attempt to be that BJ University of Aeronautics ＆ Astronautics sings teaching inventive " THE BARCHAN DUNE VORTEX heartily
(BD) flameholder "；Bibliography [4]：Sing Theoretical and Experimental Study [J] of, Ning Huang In Stability of The Barchan Dune Vortex Flame heartily
Engineering Thermophysics journal, 1982, V3 (1):The operation principle of 89-95.BD flameholders is carried by shortening or collapsing whirlpool tail
High whirlpool tail region barometric gradient reduces the flow curvature of vortex adverse current turning point and increases shear velocity gradient at this, finally blunt
Vortex structure is formed between the ox horn of two, body downstream, significantly improves vortex stability, due to vortex homeostasis, in this region
Ignition also can get good combustion stability.
From performance, BD flameholders have significantly widened the two-dimensional cell body structure flame using V-arrangement bluff body as representative
The oil-poor of stabilizer puts out boundary, and reduces flow resistance about 75%~80%, solves multiple military whirlpools of emphasis model at that time
Fuel-injection engine after-burner flame stabilization problem；And in terms of design theory angle, the meaning of BD flameholders is then more prominent
Go out --- on the one hand, BD flameholders based on vortex Theory of Stability, bibliography [5]：It is locally steady about vortex to sing heartily
Qualitatively research [J] Engineering Thermophysics journals, 1981, V2 (4):394-400. really by the design of flameholder from based on
" the subjectivity design " of engineering experience driving has risen to " positive design and rational " level driven by eddy dynamic theory, this is boat
Great-leap-forward development of empty engine core part design methodology；On the other hand it is based on the phase interaction between three-dimensional vortex
With mechanism, " standing vortex " structure with stiff stability actively is constructed using the space three-dimensional solid in flow field, even more base in the past
In a quantum jump of the after-burner flameholder design theory of two-dimensional cell body structure.But undeniably, BD flames are steady
Determine the shortcomings that device limits its further development and application there is also some：
(1) wedge angle that both ends are shunk causes the circumferential flame that joins there are certain difficulty, and the curved design at maximum groove width is also unfavorable
In radially joining flame, need additionally to increase the connection flame structure between BD flameholder each unit bodies thus, it is multiple that this just brings structure
The increase of miscellaneous degree, the rising of reduction (connection flame structure is not easy to cool down, and is easy ablation) and construction weight of reliability.
(2) excessively stable vortex structure causes downstream tail shear layer diffusion angle less than normal, this is entirely adding to flame
The indoor propagation of power burning brings adverse effect, is susceptible to the problem of Exit temperature distribution unevenness, needs additionally to increase thus
Circumferential annular flame stabilizer.
(3) the BD flameholders of Modeling of Complex Surface and its vortex Theory of Stability relied on, directly bring and set
The problem of counting excessive parameter, design difficulty increase and model adaptability aspect, which also limits it to grind in follow-up fanjet
The further development and application in hair stage.
(4) it is different from v-shaped flame stabilizer structure, BD flameholders are added by the complex-curved structure being put together of two panels
Work craftsmanship is poor, and in the afterbunring room of high temperature and high speed high load, surface temperature distribution unevenness easily occurs, appearance becomes
Shape leads to problems such as steady fuel efficiency fruit decline even to fail, this is for a new generation for having high requirements in terms of reliability and maintainability
It is for military gas-turbine unit and unacceptable.
In several years thereafter, due to many, the either BD flameholders still rotation in relation to standing vortex mechanism
Whirlpool Theory of Stability, which all fails to obtain, to be continued and develops well, these defects of BD flameholders also fail really to solve,
And associated research work is also carried out seldom, this is very unluckily.
Invention content
In order to solve high speed, under unstable state inlet flow conditions, fuel ignition difficulty is big, flame is not easy to maintain to stablize combustion by the present invention
The problems such as burning, it is proposed that a kind of folding V-type bluff body eddy flameholder can be applied not only to military performance jet boat
Empty engine main combustion chamber and after-burner, guided missile (high-speed unmanned aerial vehicle) engine supersonic combustor and other requirements are in height
The field of power machinery for stablizing burning is realized in fast air-flow；It can also be used for civilian burner field.
The folding V-type bluff body eddy flameholder is stayed by the same or similar folding V-type bluff body of several groups structure
Whirlpool flameholder combination of monomers at, each flameholder monomer include two cross-sections, etc. spanwise lengths aerofoil, two
Aerofoil selects the design feature of the traditional straight flange V-type bluff body of two panels, that is, includes groove width D and apex angle ρ two parameters.
Groove width D is calculated according to after-burner flame holding formula：
VFHFor blow-off velocity；TtFor after-burner temperature of incoming flow；PsFHPressure is put out for after-burner；KstFor stabilization
Property parameter；Apex angle ρ rule of thumb values.
Meanwhile it folding V-type bluff body eddy flameholder and foring an angle of sweep α, angle of sweep α between two aerofoils
Angular range be 60 degree to 150 degree；It is related with standing vortex area size with the standing vortex position for wishing to be formed.Two aerofoils are angularly
α welding is put together, or is directly prepared by high temperature alloy increasing material manufacturing；The spanwise length of aerofoil is that L values are 4~8 times
Groove width；
Consider that the convenience of processing and assembly, each flameholder monomer further include monomer span-wise length A and flow to string
Two parameters of long d, have：
The combining form of several flameholder monomers is：Radial, circumferentially, or radial direction is mixed with circumferential, is installed on aviation
It is adopted according to the tube structure of after-burner the combination outer end of the after-burner section of engine, several flameholder monomers
It is connected with the cylinder of conventional structure and after-burner, conical inner body of the inner end close to after-burner.
Wherein radial combining form is divided into isometric group according to the working characteristics of different aeroengine thrust augmentation combustion chambers
It closes or combination of long drives and drop shots is combined.The folding V-flame of isometric combination 12~20 equal lengths of equidistantly distributed i.e. in a circumference
Stabilizer monomer, the folding V-flame stabilizer monomer of each equal length are fixed on the circle of after-burner by aerofoil end face
On wall；
Combination of long drives and drop shots includes equally spaced long flameholder combination of monomers and short flameholder combination of monomers, short flame
The length of stabilizer combination of monomers selects end-to-end 1~2 welded together flameholder monomer, long flame stabilizer monomer
The length of combination selects end-to-end 2~3 welded together flameholder monomer.
Combination of long drives and drop shots combination in the number of long flameholder combination of monomers and short flameholder combination of monomers according to add
The diameter of power combustion chamber determines, wherein the flameholder monomer numerical value selected in long flameholder combination of monomers, is less than
Equal to 2 times of a numerical value of short flameholder combination of monomers Flame stabilizer monomer.
The aerofoil end face of each long flameholder combination of monomers or short flameholder combination of monomers is fixed on reinforcing
On the circle wall of combustion chamber；
Circumferential combining form presses the first connected form by end face weld by the flameholder monomer of 8~20 equal lengths
It is connected together, is fixed on the circle wall of after-burner；The flameholder monomer number that circumferentially combines, flameholder monomer
Size by after-burner design requirement determine.Circumferential combining form and after-burner cylinder, sudden expansion can be with heat-resisting
Metal truss is attached.
The radial hybrid combining with circumferential direction had both contained circumferential flameholder monomer type of attachment, and had also contained diameter
To flameholder monomer type of attachment；And circumferential type of attachment is arranged as required to enclose for 1 circle~3, and mounted on whole
A composite structure is connect with the inside of radial flameholder monomer in the inner part, using welding manner, for realizing fire on duty
The functions such as flame maintenance.
The combination of above-mentioned flameholder monomer and assembly principle, directly continue to use original V-type bluff body arrangement mode,
Or it makes a change according to actual needs.
Operation principle and process：
Folding V-type bluff body eddy flameholder of the present invention, when work, incoming volume takes fuel and flows through two wings
Face is ρ since the section of flameholder is curvature, is highly the plane V-type bluff body of D, and fluid is inevitable from plane V-type bluff body point
From, and form a pair in plane V-type bluff body downstream and flow to vortex, due to fold V-type bluff body gather around there are two it is symmetrical, with after certain
Two aerofoils that sweep angle α, length L cross-sections stretch, on the orthogonal plane of plane V-type bluff body, and constitute a three-dimensional space
Between on whole V-type, therefore incoming will also flow from the rim openings of two aerofoils to the central plane direction of two aerofoils,
And form the vortex extended to distribution；
Fall off from plane V-type bluff body section flow to vortex and open up it is vertical to the vortex direction of distribution, interaction, finally
Form that a pair of of spatial position is stable, is not easy to change with inlet flow conditions and changes folding V-type bluff body flameholder downstream
Standing vortex.Igniter is arranged in standing vortex center, it can be ensured that flame stabilization burns, and plays blunt more than conventional planar V-type
The steady fuel efficiency fruit of body.
The advantage of the invention is that：
(1) a kind of folding V-type bluff body eddy flameholder, it is good to incoming adaptability, by adjusting bluff body design parameter
α, ρ, L, D can form spatial position not with incoming in incoming Ma=0.1~1, the condition range of Re=60000~200000
The stabilization standing vortex of change；
(2) a kind of folding V-type bluff body eddy flameholder, it is good to inherit the oil-poor firing characteristic of BD flameholders, surely
The good feature of combustion property can be completed to light a fire in oil-poor state, and when during which sudden change occurs for incoming operating mode, oil-gas ratio, flame can still be kept
Stablize, it is wide to put out boundary；
(3) a kind of folding V-type bluff body eddy flameholder compares BD flameholders, and connection flame is more preferable, and each monomer can
Annular that is seamless and being unified into complete closure ensures that circumferential flame distribution is uniform；
(4) a kind of folding V-type bluff body eddy flameholder, bluff body downstream gas mixing is good, when using radial structure,
Also it can realize the inside and outside effective blending for containing air-flow in not Afterburning condition；
(5) a kind of folding V-type bluff body eddy flameholder, flow resistance is small, and total pressure recovery coefficient is high；
(6) a kind of folding V-type bluff body eddy flameholder, structure are much simpler compared to BD flameholders, only than passing
System V-type bluff body flameholder increases two control parameters, is easy to completely grasp its flowing and burning under different operating modes
Characteristic, it is easier to have model with aero-engine and be matched, improve existing aero-engine performance.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram folding V-type bluff body eddy flameholder of the present invention；
Fig. 2 is a kind of Local map folding V-type bluff body eddy flameholder of the present invention；
Fig. 3 is a kind of schematic view of the mounting position folding V-type bluff body eddy flameholder of the present invention；
Fig. 4 is a kind of Radial Combinations schematic diagram folding V-type bluff body eddy flameholder of the present invention；
Fig. 5 is a kind of circumferential combination diagram folding V-type bluff body eddy flameholder of the present invention；
Fig. 6 is a kind of radial direction folding V-type bluff body eddy flameholder of the present invention and circumferential combination diagram.
Fig. 7 is a kind of different angle of sweep α vortex structure schematic diagrames folding V-type bluff body eddy flameholder of the present invention；
Fig. 8 a are that traditional V-type bluff body flameholder only has Shedding Vortex A and the separation vortex B schematic diagrames at both ends；
The standing vortex C that Fig. 8 b form a pair of of reverse rotation for present invention folding V-type bluff body eddy flameholder on head shows
It is intended to；
Fig. 9 a are the vortex structure schematic diagram of the invention at angle of sweep α=90 degree, Re=100000, obtained；
Fig. 9 b are the motion pattern schematic diagram of the invention at angle of sweep α=90 degree, Re=100000, obtained；
Figure 10 is the standing vortex position view that the present invention is obtained when angle of sweep α and Re take different value respectively.
Specific implementation mode
The specific implementation method of the present invention is described in detail below in conjunction with the accompanying drawings.
The present invention is on the basis of furtheing investigate standing vortex Steady burning mechanism, in conjunction with dune-shaped stationary-eddy flameholder and traditional V-type
A kind of advantage of flameholder respectively, it is proposed that bluff body eddy flameholder of the folding V-structure of Three-dimensional Flow.
The folding V-type bluff body eddy flameholder, as shown in Figure 1, by the same or similar folding of several groups structure
Folded V-type bluff body eddy flameholder combination of monomers at, each flameholder monomer include two cross-sections, etc. spanwise lengths
Aerofoil, as shown in Fig. 2, the design feature of traditional V-type bluff body is continued to use in V-type bluff body section, including groove width D and apex angle ρ two parameters.
Groove width D is calculated according to after-burner flame holding formula：
VFHFor blow-off velocity, Mach number M=0.1~0.35 is generally taken；TtFor after-burner temperature of incoming flow, according to inside and outside
Contain gas temperature, generally Tt=300K~900K, PsFHPressure is put out for after-burner, takes PsFH=69kpa, KstFor stabilization
Property parameter generally takes K according to domestic air mail engine modular design conditionst=5~9.
Apex angle ρ rule of thumb, generally takes at 30~45 degree.Value, which crosses conference, causes blockage ratio to increase severely with flow resistance, takes
It is worth too small, is unfavorable for the formation of recirculating zone.
But it is different from traditional straight flange V-type bluff body, one is formd between folding V-type bluff body two aerofoils of eddy flameholder
The angular range of a angle of sweep α, angle of sweep α are 60 degree to 150 degree, are had with standing vortex area size with the standing vortex position formed is wished
It closes.Angularly α welding is put together the straight flange V-type bluff body that two aerofoils select two panels traditional, or increases material by high temperature alloy
Manufacture is directly prepared into；The groove width that the spanwise length L values of aerofoil are 4~8 times；
Bibliography 6：Sing research [J] the Engineering Thermophysics journals of about vortex local stability, 1981, V2 (4) heartily:
394-400；It is unrelated with speed of incoming flow since the formation of standing vortex is to flow the performance of modelling according to vortex Theory of Stability, only with
It is related to fold V-type bluff body four design parameters of eddy flameholder, therefore when tri- parameters of L, D, ρ all determine, for ginseng
Counting the general rules of α is, as shown in fig. 7, as Re=40500, in α>At 90 °, α is bigger, longer, the exhibition that flows to length of standing vortex
It is narrower to width；At 60 °<α<At 90 °, standing vortex flow direction is first reduced with span-wise length, after be held essentially constant, stability is further
Enhancing；α<Then there is no significant fluidal textures at 60 °.
Consider that the convenience of processing and assembly, each flameholder monomer further include monomer span-wise length A and flow to string
Two parameters of long d.Obvious, have：
Compared to traditional V-type bluff body flameholder of only two parameter groove width D and apex angle ρ controls, folds V-type bluff body and stay
Whirlpool flameholder is practical to merely add span L and two parameters of angle of sweep α.
The combining form of several flameholder monomers is：Radial, circumferentially, or radial direction is mixed with circumferential, is installed on boat
The after-burner section of empty engine, as shown in figure 3, combination outer end (radial outside) basis of several flameholder monomers adds
The tube structure of power combustion chamber is connected, inner end (diameter using the cylinder of the conventional structures such as bolt, Tenon, key sheath and after-burner
Inwardly) close to the conical inner body of after-burner (sudden expansion).
Radial combining form, according to the working characteristics of different aeroengine thrust augmentation combustion chambers, be divided into isometric combination or
Combination of long drives and drop shots multiple combinations.The folding V-flame of isometric combination 12~20 equal lengths of equidistantly distributed i.e. in a circumference
Stabilizer monomer, equal length refer to the length or 2~3 flameholder monomers that length is single flameholder monomer
The end-to-end length being welded；The folding V-flame stabilizer monomer of each equal length, which is fixed on by aerofoil end face, to be added
On the circle wall of power combustion chamber；
As shown in figure 4, combination of long drives and drop shots includes equally spaced long flameholder combination of monomers and short flameholder monomer
Combination, the length of short flameholder combination of monomers select end-to-end 1~2 welded together flameholder monomer, long
The length of flame stabilizer combination of monomers selects end-to-end 2~3 welded together flameholder monomer.
Combination of long drives and drop shots combination in the number of long flameholder combination of monomers and short flameholder combination of monomers according to add
The diameter of power combustion chamber determines, wherein the flameholder monomer numerical value selected in long flameholder combination of monomers, is less than
Equal to 2 times of a numerical value of short flameholder combination of monomers Flame stabilizer monomer.
The aerofoil end face of each long flameholder combination of monomers or short flameholder combination of monomers is fixed on reinforcing
On the circle wall of combustion chamber；
As shown in figure 5, the shape that circumferential combining form is connected by the flameholder monomer of 8~20 equal lengths by first place
Formula welds together end face, is fixed on the circle wall of after-burner；The flameholder monomer number that circumferentially combines, flame
The size of stabilizer monomer is determined by the design requirement of after-burner.Circumferential combining form and after-burner cylinder are dashed forward
Expansion can be attached with heating resisting metal truss.
As shown in fig. 6, the radial hybrid combining with circumferential direction, is the equal of Radial Combinations and the mixing circumferentially combined, both wrapped
Contain circumferential flameholder monomer type of attachment, also contains radial flameholder monomer type of attachment；And it is circumferential
Type of attachment be arranged as required to for 1 circle~3 circle, and mounted on entire composite structure in the inner part, using welding manner with
The inside of radial flameholder monomer connects, for realizing functions such as flame on duty maintenances.
The combination of above-mentioned flameholder monomer and assembly principle, do not have area with traditional V-type bluff body or BD type bluff bodies
Not, original V-type bluff body arrangement mode can be directly continued to use, can also be made a change according to actual needs.
Operation principle and process：
Folding V-type bluff body eddy flameholder of the present invention, when work, incoming volume takes fuel, from side shown in Fig. 1
To flowing through two aerofoils, be ρ since the section of flameholder is curvature, be highly the plane V-type bluff body of D, fluid it is inevitable from
Plane V-type bluff body detaches, and forms a pair in plane V-type bluff body downstream and flow to vortex, as shown in Figure 8 a, traditional V-type bluff body fire
Flame stabilizer only has Shedding Vortex A and the separation vortex B at both ends, i.e., realizes igniting to the center of vorticity area of low pressure for flowing to vortex at this and fire
It burns.
And since folding V-type bluff body is gathered around, there are two two wings that are symmetrical, being stretched with certain angle of sweep α, length L cross-sections
Face on the orthogonal plane of plane V-type bluff body, and constitutes the whole V-type on a three dimensions, therefore incoming will also be from two
It is flowed to the central plane direction of two aerofoils at the rim openings of a aerofoil, and forms the vortex extended to distribution；
Numerical computations and experimental study show that as shown in Figure 8 b, what is fallen off from plane V-type bluff body section flows to vortex and exhibition
Vortex direction to distribution is vertical, interaction, finally forms a pair of of spatial position in folding V-type bluff body flameholder downstream
Stablize, be not easy the standing vortex to change with inlet flow conditions variation.
Standing vortex center of vorticity can be stable in the presence of bluff body downstream specific position, not change with incoming situation, only several with above-mentioned bluff body
What design parameter is related.According to this characteristic, at this to standing vortex center arrangement igniter, it can be ensured that extremely complicated, non-
Under permanent incoming operating mode, igniting is completed, and flame stabilization is kept to burn, play the steady combustion more than conventional planar V-type bluff body
Effect.
Embodiment：
For the folding V-type bluff body eddy flameholder of α=90 degree, carries out numerical experiment and obtained in Re=100000
As illustrated in fig. 9 to vortex structure figure, motion pattern is as shown in figure 9b.Studies have shown that flame can under the conditions of compared with high reynolds number,
Bluff body standing vortex and standing vortex downstream area stablize burning, and pitot loss is smaller, and efficiency of combustion is very high.
As shown in Figure 10, when Re distinguishes value 30000,40500,50600,60750,70900 and 81000, standing vortex position
It sets and does not change with speed of incoming flow.
Meanwhile when angle of sweep α takes 180 degree, on the span section of traditional V-type bluff body flameholder, it is seen that vortex is handed over
For disengaging；When angle of sweep, α takes 150 degree, vortex is detached from frequency and reduces.When angle of sweep, α takes 120 degree, standing vortex gradually forms；When
When angle of sweep α takes 90 degree, complete standing vortex is formed.When angle of sweep, α takes 60 degree, standing vortex reduces, and stability is reinforced.
Claims (6)
1. a kind of folding V-type bluff body eddy flameholder, which is characterized in that by the same or similar folding V of several groups structure
Type bluff body eddy flameholder combination of monomers at, each flameholder monomer include two cross-sections, etc. spanwise lengths
Aerofoil, two aerofoils select the design feature of the traditional straight flange V-type bluff body of two panels, including groove width D and apex angle ρ two parameters；
Groove width D is calculated according to after-burner flame holding formula：
VFHFor blow-off velocity；TtFor after-burner temperature of incoming flow；PsFHPressure is put out for after-burner；KstJoin for stability
Number；Apex angle ρ rule of thumb values；
Meanwhile it folding V-type bluff body eddy flameholder and foring an angle of sweep α between two aerofoils；Two aerofoils are pressed
Angle [alpha] welding is put together, or is directly prepared by high temperature alloy increasing material manufacturing；
The combining form of several flameholder monomers is：Radial, circumferentially, or radial direction is mixed with circumferential, is installed on aeroplane engine
The after-burner section of machine, several flameholder monomers combine tube structure of the outer end according to after-burner, using normal
The cylinder for advising structure and after-burner connects, conical inner body of the inner end close to after-burner；
Wherein radial combining form, according to the working characteristics of different aeroengine thrust augmentation combustion chambers, be divided into isometric combination or
Combination of long drives and drop shots is combined；
End face is welded on by the flameholder monomer of 8~20 equal lengths by end to end form by circumferential combining form
Together, it is fixed on the circle wall of after-burner；The ruler of the flameholder monomer number, flameholder monomer that circumferentially combine
The very little design requirement by after-burner determines；Circumferential combining form can use heating resisting metal with after-burner cylinder, sudden expansion
Truss is attached；
The radial hybrid combining with circumferential direction had both contained circumferential flameholder monomer type of attachment, had also contained radial
Flameholder monomer type of attachment；And circumferential type of attachment is arranged as required to enclose for 1 circle~3, and it is mounted on entire group
It closes structure in the inner part, is connect with the inside of radial flameholder monomer using welding manner.
2. a kind of folding V-type bluff body eddy flameholder as described in claim 1, which is characterized in that the angle of sweep α
Angular range be 60 degree to 150 degree.
3. a kind of folding V-type bluff body eddy flameholder as described in claim 1, which is characterized in that the aerofoil
The groove width that the value of spanwise length L is 4~8 times.
4. a kind of folding V-type bluff body eddy flameholder as claimed in claim 3, which is characterized in that each fire
Flame stabilizer monomer further includes monomer span-wise length A and flows to two parameters of chord length d, and formula is as follows：
5. a kind of folding V-type bluff body eddy flameholder as described in claim 1, which is characterized in that described isometric group
The folding V-flame stabilizer monomer of i.e. 12~20 equal lengths of equidistantly distributed in a circumference is closed, each equal length
V-flame stabilizer monomer is folded to be fixed on the circle wall of after-burner by aerofoil end face；
Combination of long drives and drop shots includes equally spaced long flameholder combination of monomers and short flameholder combination of monomers, short flame stabilization
The length of device combination of monomers selects end-to-end 1~2 welded together flameholder monomer, long flame stabilizer combination of monomers
Length select end-to-end 2~3 welded together flameholder monomer；Each long flameholder combination of monomers or
The aerofoil end face of short flameholder combination of monomers is fixed on the circle wall of after-burner；
The number of long flameholder combination of monomers and short flameholder combination of monomers is fired according to reinforcing in combination of long drives and drop shots combination
The diameter for burning room determines, wherein the flameholder monomer numerical value selected in long flameholder combination of monomers, is less than or equal to
2 times of a numerical value of short flameholder combination of monomers Flame stabilizer monomer.
6. a kind of folding V-type bluff body eddy flameholder as described in claim 1, which is characterized in that operation principle and mistake
Journey：
The folding V-type bluff body eddy flameholder, when work, incoming volume takes fuel and flows through two aerofoils, due to flame
The section of stabilizer is that curvature is ρ, is highly the plane V-type bluff body of D, and fluid is inevitable to be detached from plane V-type bluff body, and in plane
V-type bluff body downstream forms a pair and flows to vortex, due to fold V-type bluff body gather around there are two it is symmetrical, with certain angle of sweep α, length L
Two aerofoils that cross-section stretches, on the orthogonal plane of plane V-type bluff body, and constitute the whole V on a three dimensions
Type, therefore incoming will also flow from the rim openings of two aerofoils to the central plane direction of two aerofoils, and formed and extended
To the vortex of distribution；
Fall off from plane V-type bluff body section flow to vortex with open up it is vertical to the vortex direction of distribution, interaction, finally rolling over
Folded V-type bluff body flameholder downstream forms that a pair of of spatial position is stable, is not easy with inlet flow conditions variation and what is changed stay
Whirlpool；Igniter is arranged in standing vortex center, it can be ensured that flame stabilization burns, and plays more than conventional planar V-type bluff body
Steady fuel efficiency fruit.
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| CN201810450776.1A CN108426267B (en) | 2018-05-11 | 2018-05-11 | Folding V-shaped blunt body standing vortex flame stabilizer |
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| CN201810450776.1A CN108426267B (en) | 2018-05-11 | 2018-05-11 | Folding V-shaped blunt body standing vortex flame stabilizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274259A (en) * | 2019-06-13 | 2019-09-24 | 中国人民解放军空军工程大学 | A kind of plasma excitation Formula V type flameholder |
| CN113701191A (en) * | 2021-09-01 | 2021-11-26 | 南昌航空大学 | Staggered flow guide middle seam type V-shaped flame stabilizer |
| CN116025926A (en) * | 2023-03-10 | 2023-04-28 | 中国航发沈阳发动机研究所 | Afterburner of aeroengine |
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Cited By (4)
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|---|---|---|---|---|
| CN110274259A (en) * | 2019-06-13 | 2019-09-24 | 中国人民解放军空军工程大学 | A kind of plasma excitation Formula V type flameholder |
| CN113701191A (en) * | 2021-09-01 | 2021-11-26 | 南昌航空大学 | Staggered flow guide middle seam type V-shaped flame stabilizer |
| CN113701191B (en) * | 2021-09-01 | 2022-06-24 | 南昌航空大学 | Staggered flow guide middle seam type V-shaped flame stabilizer |
| CN116025926A (en) * | 2023-03-10 | 2023-04-28 | 中国航发沈阳发动机研究所 | Afterburner of aeroengine |
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| CN108426267B (en) | 2023-07-25 |
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