CN109737450B - Combustion chambers burn oscillation control device and combustion chambers burn oscillation control method - Google Patents
Combustion chambers burn oscillation control device and combustion chambers burn oscillation control method Download PDFInfo
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- CN109737450B CN109737450B CN201811509406.7A CN201811509406A CN109737450B CN 109737450 B CN109737450 B CN 109737450B CN 201811509406 A CN201811509406 A CN 201811509406A CN 109737450 B CN109737450 B CN 109737450B
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Abstract
The present invention relates to the energy and dynamic field, disclosing a kind of combustion chambers burn oscillation control device and combustion chambers burn oscillation control method, the combustion chambers burn oscillation control device includes: the inlet casing and burner inner liner of tapering transition structure and coaxial arrangement；The caliber of burner inner liner is greater than inlet casing, and the inlet end of burner inner liner is connected to the bigger diameter end of tapering transition structure, and the miner diameter end of tapering transition structure is connected to the outlet side of inlet casing；The inner wall fitting flame front of tapering transition structure is flowed to along flame to be arranged.Flame subtended angle of the present invention according to flame in its natural state, change the shape of burner inner liner restriction of domain, eliminate the area burner inner liner Jiao Wo, to reduce influence of the large scale eddy structure to flame, and the movement of flame is limited, the effect for inhibiting combustion oscillation is finally played, practice finds the device to single swirl flame, layering swirl flame etc. has significant effect, has preferable versatility.
Description
Technical field
The present invention relates to the energy and dynamic field, in particular to a kind of combustion chambers burn oscillation control device and combustion chamber combustion
Burn oscillation control method.
Background technique
The burning of fossil fuel is still the main power of the mankind and energy source.It is answered in the energy and many of dynamic field
In, combustion oscillation is the common major technical challenge of all kinds of burners, is widely present in boiler, heater, wall-hung boiler, combustion gas
The burners such as water heater, aero-engine and gas-turbine combustion chamber.Especially in the emission request being increasingly stringenter at present
Under, in order to reduce the pollutant emission based on nitrogen oxides (NOx), present advanced burner frequently with poor oil firing's mode,
Flame, which usually works, is closing on flame-out operating condition, is easy to be generated the pulsation of heat release rate by external disturbance.When heat release rate is pulsed
(can simply be interpreted as meeting Rayleigh criterion) when coupling with combustion system acoustics, then be easy cause significantly heat release rate pulsation and
Pressure fluctuation, gently then influences the stable operation range of burner, heavy then cause burner or other component hardware damage, sternly
Important place can also threaten the operational safety of whole system.Therefore, combustion oscillation is that modern advanced burner must make efforts to evade
's.
Solution to the problems described above can be divided into passive control and two class of active control.Active control is using external
Active actuator initiatively apply suitable external drive according to signals such as pressure fluctuations in the combustion system monitored
(inlet air or fuel are supplied etc.), suppress or eliminate the coupling between the pulsation of heat release rate and sound wave.But such methods need
Additional control system and actuator, the requirement to control algolithm is also very high, will increase additional cost, and it is limited to be applicable in scene.
Passive control refers to is added fixedly certain devices in combustion system, to suppress or eliminate combustion oscillation.It common are each
Class acoustics component, such as Helmholtz resonator, can inhibit the combustion oscillation of specific frequency.The disadvantage is that volume is larger, and
It is only capable of effective to specific frequency, a large amount of experiment and debugging need to be done in advance.Another method is to directly act on to flame itself,
By changing the kinetic property of flame, reduce the pulsation of flame itself in wider working range, heat release rate is allowed to pulse certainly
It so is decoupled with system acoustic, or amplitude very little coupling, is not enough to excite the combustion oscillation of combustion system.It is this kind of direct
The passive control methods of flame itself, adaptable strong, at low cost advantage are acted on, but existing burner is rare directly
By change flame kinetic property come solve the problems, such as combustion oscillation this, propose that one kind is able to solve combustion based on this application
The combustion chambers burn oscillation control device and combustion chambers burn oscillation control method that combustion shock is swung.
Summary of the invention
(1) technical problems to be solved
The present invention provides a kind of combustion chambers burn oscillation control device and combustion chambers burn oscillation control method, existing to solve
The problems such as coupling of combuster flame and large scale whirlpool causes combustion oscillation reduces flame and system acoustic to realize
Coupling inhibit combustion oscillation purpose.
(2) technical solution
To solve the above problems, the present invention provides a kind of combustion chambers burn oscillation control device, comprising: tapering transition structure
And the inlet casing and burner inner liner of coaxial arrangement；The caliber of the burner inner liner be greater than the inlet casing, the burner inner liner into
Gas end is connected to the bigger diameter end of the tapering transition structure, the miner diameter end of the tapering transition structure and going out for the inlet casing
The connection of gas end；Wherein, the inner wall fitting flame front of the tapering transition structure is flowed to along flame is arranged.
Further, the inlet end inner wall of the burner inner liner is equipped with the area a Quan Jiaowo sprue, the area Jiao Wo sprue
Inside is equipped with bellmouth, and to form the tapering transition structure in the burner inner liner, the bigger diameter end of the bellmouth is towards institute
State burner inner liner, the miner diameter end of the bellmouth is towards the inlet casing.
Further, further includes: head of combustion chamber, the head of combustion chamber and the inlet casing are coaxially disposed, fixed
In the inlet casing.
Further, the angle of the tapering transition structure respective side inner wall is 40~150 °.
Further, rounded company between the miner diameter end of the tapering transition structure and the outlet side of the inlet casing
It connects.
To solve the above problems, including the following steps: the present invention also provides a kind of combustion chambers burn oscillation control method
Step S1: the average image in burner inner liner is obtained, determines flame in the natural subtended angle of the burner inner liner；
Step S2: by the natural subtended angle, tapering transition structure is designed, the inner wall of the tapering transition structure is bonded
Flame front is flowed to along flame to be arranged；
Step S3: the bigger diameter end of the tapering transition structure is connected to the inlet end of the burner inner liner, by the taper
The miner diameter end of transition structure is connected to the outlet side of inlet casing.
Further, the specific steps of the step S2 include: by the natural subtended angle, in the air inlet of the burner inner liner
It holds and the area Jiao Wo sprue is set on inner wall, to form the tapering transition structure in the burner inner liner；Wherein, the area Jiao Wo is stifled
The inside of block is equipped with bellmouth, and the bigger diameter end of the bellmouth is towards the burner inner liner, and the miner diameter end of the bellmouth is towards institute
State inlet casing.
Further, the specific steps of the step S2 include: to design the tapering transition knot by the natural subtended angle
Structure makes the angle of the tapering transition structure respective side inner wall be greater than or equal to the natural subtended angle.
Further, the step of step S3 includes sub-step: adjusting the tapering transition structure, makes the taper mistake
Cross rounded connection between the miner diameter end of structure and the outlet side of the inlet casing.
Further, the angle of the tapering transition structure respective side inner wall is 40~150 °.
(3) beneficial effect
The present invention provides a kind of combustion chambers burn oscillation control device and combustion chambers burn oscillation control method, the combustion chamber
Combustion oscillation control device is connected the inlet end of burner inner liner and the bigger diameter end of tapering transition structure by setting tapering transition structure
It is logical, the miner diameter end of tapering transition structure is connected to the outlet side of inlet casing, and the inner wall of tapering transition structure is made to be bonded fire
Flamjne front face is flowed to along flame to be arranged, and according to the flame subtended angle of flame in its natural state, is changed the shape of burner inner liner restriction of domain, is disappeared
Except the area burner inner liner Jiao Wo, to reduce influence of the large scale eddy structure to flame, and the movement of flame is limited, finally played
Inhibit the effect of combustion oscillation, practice finds the device to single swirl flame, and being layered swirl flame etc. has significant effect, has
There is preferable versatility.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the combustion chambers burn oscillation control device provided in first preferred embodiment of the invention；
Fig. 2 is the partial schematic diagram of combustion chambers burn oscillation control device in Fig. 1；
Fig. 3 is the structural schematic diagram of the combustion chambers burn oscillation control device provided in second preferred embodiment of the invention；
Fig. 4 is the structural schematic diagram of conventional dump combustion chamber；
Fig. 5 is the combustion oscillation number of the burner inner liner and the burner inner liner for being provided with tapering transition structure of conventional dump combustion chamber
According to；
Wherein, 1: head of combustion chamber；2: inlet casing；3 tapering transition structures；4: burner inner liner；5: air；6: flame front
Face；7: unburned mixture；8: angle；10: Jiao Wo area's sprue；11: flame；12: natural subtended angle；The area 13: Jiao Wo；14: fillet.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of combustion chambers burn oscillation control device, as shown in Figure 1, the combustion chambers burn vibrates
Control device includes:
Tapering transition structure 3 and the inlet casing 2 and burner inner liner 4 of coaxial arrangement.The caliber of burner inner liner 4 is greater than inlet casing
The inlet end of 2 caliber, burner inner liner 4 is connected to the bigger diameter end of tapering transition structure 3, the miner diameter end of tapering transition structure 3 with into
The outlet side of mechanism of qi casket 2 is connected to, and inlet casing 2 is connected to by tapering transition structure 3 with burner inner liner 4.Wherein, tapering transition structure
3 can be realized by modification 4 type face of burner inner liner.The inner wall fitting flame front 6 of tapering transition structure 3 is set along flame flow direction
It sets.
In the present embodiment, the combustion chambers burn oscillation control device further include: head of combustion chamber 1, head of combustion chamber 1 with into
Mechanism of qi casket 2 is coaxially disposed, and is fixed in inlet casing 2.
In the course of work, it is arranged due to flowing to the inner wall fitting flame front 6 of tapering transition structure 3 along flame, air inlet
Casing 2 enters air 5, is based on Kang Enda effect, and tapering transition structure 3 constitutes transition restriction of domain, the sky that head of combustion chamber 2 exports
The unburned mixture 7 of gas and fuel can be bonded the flowing of tapering transition structure 3, so that flame front 6 will be as much as possible close to cone
The inner wall of shape transition structure 3 flows, to reduce the pulsation of heat release rate, decouples it with combustion system sound system, final to inhibit
Combustion oscillation.
The embodiment of the present invention provides a kind of combustion chambers burn oscillation control device, and the combustion chambers burn oscillation control device is logical
Setting tapering transition structure 3 is crossed, the inlet end of burner inner liner 4 is connected to the bigger diameter end of tapering transition structure 3, by tapering transition knot
The miner diameter end of structure 4 is connected to the outlet side of inlet casing 2, and the inner wall of tapering transition structure 3 is made to be bonded flame front 6 along flame
Flow direction setting changes the shape of 4 restriction of domain of burner inner liner according to the flame subtended angle of flame in its natural state, eliminates 4 jiaos of burner inner liner
Whirlpool area to reduce influence of the large scale eddy structure to flame, and limits the movement of flame, finally plays inhibition burning vibration
The effect swung, practice find the device to single swirl flame, and being layered swirl flame etc. has significant effect, has preferable logical
The property used.
Based on the above embodiment, in a preferred embodiment, as shown in Fig. 2, to be imitated to greatest extent using Kang Enda
It answers, in the present embodiment, rounded 14 connection, impulse- free robustness between the miner diameter end of tapering transition structure 3 and the outlet side of inlet casing 2
And wedge angle, so that unburned mixture 7 is bonded the inner wall flowing of tapering transition structure 3, to limit the movement of flame front 6.
Based on the above embodiment, in a preferred embodiment, in conventional combustion chamber, burner inner liner 4 generally all can
Using sudden expansion structure, as shown in figure 3, the area Jiao Wo sprue 10 can be inserted in the area Jiao Wo of burner inner liner 4, in 4 inlet end of burner inner liner
One area Quan Jiaowo sprue 10 is set on inner wall, and the inside of the area Jiao Wo sprue 10 is equipped with bellmouth, to form taper in burner inner liner 4
Transition structure 3, the bigger diameter end of bellmouth is towards burner inner liner 4, and the miner diameter end of bellmouth is towards inlet casing 2, to make taper mistake
The inner wall fitting flame front 6 for crossing structure 3 is flowed to along flame to be arranged.
Wherein, the angle 8 of 3 respective side inner wall of tapering transition structure, the i.e. angle 8 of transition restriction of domain, mainly pass through flame
It is obtained in the natural subtended angle of burner inner liner 4, the nature of the angle 8 and flame of 3 respective side inner wall of tapering transition structure in burner inner liner 4
Subtended angle is close, and the angle 8 for the 3 respective side inner wall of tapering transition structure generally chosen should be greater than or be equal to nature subtended angle.Preferably,
The angle 8 of 3 respective side inner wall of tapering transition structure is 40~150 °.
Be different from above-described embodiment, the present embodiment by the way that the area Jiao Wo sprue 10 is arranged on the inner wall of 4 inlet end of burner inner liner,
Tapering transition structure 3 is formed in burner inner liner 4, is flowed to so that the inner wall of tapering transition structure 3 be made to be bonded flame front 6 along flame
Setting changes the shape of 4 restriction of domain of burner inner liner according to the flame subtended angle of flame in its natural state, eliminates 4 jiaos of whirlpools of burner inner liner
Area to reduce influence of the large scale eddy structure to flame, and limits the movement of flame, finally plays inhibition combustion oscillation
Effect.
The embodiment of the present invention also provides a kind of combustion chambers burn oscillation control method, as shown in Figures 1 to 5, the combustion chamber
Combustion oscillation control method includes the following steps:
Step S1: the average image in burner inner liner 4 is obtained, determines flame 11 in the natural subtended angle 12 of burner inner liner 4.
Specifically, as shown in figure 4, burner inner liner 4 in conventional dump combustion chamber, in the area Jiao Wo 13, there are the whirlpools of large scale
Whirlpool.In such burner inner liner 4, the average image of flame 11 under natural conditions is measured, so that it is determined that flame 11 is in burner inner liner 4
In natural subtended angle 12.
Step S2: by natural subtended angle 12, designing tapering transition structure 3, and the inner wall of tapering transition structure 3 is made to be bonded flame
Sharp side 6 is flowed to along flame to be arranged.
After nature subtended angle 12 has been determined, by natural subtended angle 12, tapering transition structure 3 is designed, keeps tapering transition structure 3 right
The angle 8 of side inner wall is answered to be greater than or equal to nature subtended angle 12.Main method be by obtain the flame image of conventional burner inner liner 4 come
Design tapering transition structure 3.Compare the fire in the burner inner liner 4 of conventional dump combustion chamber and the burner inner liner 4 with tapering transition structure 3
11 image of flame.For example, it is 56 ° that nature subtended angle 12 is presented in the burner inner liner 4 of conventional sudden expansion, tapering transition structure 3 is designed accordingly
The angle 8 of respective side inner wall is 60 °, and unburned mixture 7 has been bonded the inner wall of tapering transition structure 3, flame front 6 completely at this time
It is consistent with the angle 8 of tapering transition structure 3.
Wherein, the angle 8 of 3 respective side inner wall of tapering transition structure mainly passes through flame 11 in the natural subtended angle of burner inner liner 4
12 obtain, and the angle 8 and flame 11 of tapering transition structure 3 respective side inner wall are close in the natural subtended angle of burner inner liner 4, general to select
The angle 8 of the 3 respective side inner wall of tapering transition structure taken should be greater than or be equal to nature subtended angle 12.Preferably, tapering transition structure 3
The angle 8 of respective side inner wall is 40~150 °.
In addition, also the area Jiao Wo sprue 10 can be arranged on the inner wall of 4 inlet end of burner inner liner by nature subtended angle 12, with
Tapering transition structure 3 is formed in burner inner liner 4, so that the inner wall of tapering transition structure 3 is bonded flame front 6 and is set along the flow direction of flame 11
It sets.Wherein, the inside of the area Jiao Wo sprue 10 is equipped with bellmouth, and the bigger diameter end of bellmouth is towards burner inner liner 4, the miner diameter end of bellmouth
Towards inlet casing 2.
Step S3: the bigger diameter end of tapering transition structure 3 is connected to the inlet end of burner inner liner 4, by tapering transition structure 3
Miner diameter end is connected to the outlet side of inlet casing 2；Wherein, the caliber of burner inner liner 4 is greater than the caliber of inlet casing 2.
After the angle that tapering transition structure 3 has been determined, then by the air inlet of the bigger diameter end of tapering transition structure 3 and burner inner liner 4
End connection, the miner diameter end of tapering transition structure 3 is connected to the outlet side of inlet casing 2.
In the course of work, it is arranged due to flowing to the inner wall fitting flame front 6 of tapering transition structure 3 along flame 11, into
Mechanism of qi casket 2 enters air 5, is based on Kang Enda effect, and tapering transition structure 3 constitutes transition restriction of domain, what head of combustion chamber 2 exported
The unburned mixture 7 of air and fuel can be bonded tapering transition structure 3 flowing, thus flame front 6 will as much as possible close to
The inner wall of tapering transition structure 3 flows, to reduce the pulsation of heat release rate, decouples it with combustion system sound system, final to press down
Combustion oscillation processed.As shown in figure 5, being pressed in the burner inner liner 4 in conventional combustion chamber under the frequency unanimous circumstances of pressure fluctuation
Power pulses amplitude for 279Pa, and the amplitude of pressure fluctuation for being provided with the burner inner liner 4 of tapering transition structure 3 is 20.2Pa.It can see
Out, the burner inner liner 4 in the present embodiment provided with tapering transition structure 3 inhibits combustion oscillation significantly, meanwhile, according to current
Experiment, the burner with tapering transition structure 3 that the present invention designs are suitable for common working range, such as equivalent proportion 0.50
In the range of~0.70, it can inhibit significant combustion oscillation.
It is to sum up told, the embodiment of the present invention provides a kind of combustion chambers burn oscillation control method, by the way that tapering transition is arranged
The inlet end of burner inner liner 4 is connected to by structure 3 with the bigger diameter end of tapering transition structure 3, by the miner diameter end of tapering transition structure 4 with
The outlet side of inlet casing 2 is connected to, and so that the inner wall of tapering transition structure 3 is bonded flame front 6 and is flowed to along flame 11 and be arranged, root
According to 11 subtended angle of flame of flame 11 in its natural state, change the shape of 4 restriction of domain of burner inner liner, eliminates 4 area Jiao Wo of burner inner liner, from
And influence of the large scale eddy structure to flame 11 is reduced, and limit the movement of flame 11, finally play inhibition combustion oscillation
Effect, practice finds the device to single swirl flame, and being layered swirl flame etc. has significant effect, has preferable general
Property.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (4)
1. a kind of combustion chambers burn oscillation control method, which comprises the steps of:
Step S1: the average image in burner inner liner is obtained, determines flame in the natural subtended angle of the burner inner liner；
Step S2: by the natural subtended angle, tapering transition structure is designed, the folder of the tapering transition structure respective side inner wall is made
Angle is greater than or equal to the natural subtended angle, and the inner wall fitting flame front of the tapering transition structure is flowed to along flame to be arranged；
Step S3: the bigger diameter end of the tapering transition structure is connected to the inlet end of the burner inner liner, by the tapering transition
The miner diameter end of structure is connected to the outlet side of inlet casing；Wherein, the caliber of the burner inner liner is greater than the pipe of the inlet casing
Diameter.
2. combustion chambers burn oscillation control method according to claim 1, which is characterized in that the specific step of the step S2
Suddenly include:
By the natural subtended angle, the area Jiao Wo sprue is set on the inlet end inner wall of the burner inner liner, in the burner inner liner
It is interior to form the tapering transition structure；Wherein, the inside of the area Jiao Wo sprue is equipped with bellmouth, the bigger diameter end of the bellmouth
Towards the burner inner liner, the miner diameter end of the bellmouth is towards the inlet casing.
3. combustion chambers burn oscillation control method according to claim 1, which is characterized in that the step of step S3 wraps
Enclosed tool step:
The tapering transition structure is adjusted, is made between the miner diameter end of the tapering transition structure and the outlet side of the inlet casing
Rounded connection.
4. combustion chambers burn oscillation control method according to claim 1, which is characterized in that the tapering transition structure pair
The angle for answering side inner wall is 40~150 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811509406.7A CN109737450B (en) | 2018-12-11 | 2018-12-11 | Combustion chambers burn oscillation control device and combustion chambers burn oscillation control method |
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| CN201811509406.7A CN109737450B (en) | 2018-12-11 | 2018-12-11 | Combustion chambers burn oscillation control device and combustion chambers burn oscillation control method |
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| CN111271732B (en) * | 2020-02-20 | 2021-01-15 | 北京航空航天大学 | Distributed multi-nozzle combustion chamber |
| CN113757720B (en) * | 2021-09-18 | 2023-01-31 | 北京航空航天大学 | Combustion oscillation control device and method and combustion chamber |
| CN113757719B (en) * | 2021-09-18 | 2023-05-05 | 北京航空航天大学 | Combustion oscillation control method for combustion chamber and combustion chamber |
| CN114413283B (en) * | 2021-12-28 | 2023-05-12 | 北京动力机械研究所 | Integrated structure of cyclone sleeve and head plate |
| CN114811651B (en) * | 2022-06-01 | 2023-03-24 | 清华大学 | Electric heating stable combustion system, method and storage medium |
| CN115325564B (en) * | 2022-07-21 | 2023-06-30 | 北京航空航天大学 | Method and device for suppressing combustion oscillation by combining pneumatic diversion |
| CN115435336B (en) * | 2022-09-01 | 2024-04-09 | 中国航发贵阳发动机设计研究所 | Flame stabilizer structure with adjustable blocking ratio |
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