CN109724107A - A kind of method that high frequency pumping discharge side surface plasma inhibits combustion pressure pulsation - Google Patents
A kind of method that high frequency pumping discharge side surface plasma inhibits combustion pressure pulsation Download PDFInfo
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- CN109724107A CN109724107A CN201811639692.9A CN201811639692A CN109724107A CN 109724107 A CN109724107 A CN 109724107A CN 201811639692 A CN201811639692 A CN 201811639692A CN 109724107 A CN109724107 A CN 109724107A
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Abstract
A kind of method that high frequency pumping discharge side surface plasma inhibits combustion pressure pulsation is related to a kind of method for inhibiting pressure fluctuation in thermal acoustic oscillation phenomenon.The present invention uses side plasma to regulate and control the pressure fluctuation state that combustion chamber occurs in combustion process under certain operating condition as a kind of dynamic, the mode of active.The present invention generates plasma using dielectric impedance (DBD) electric discharge in the flame side of combustion chamber, by adjusting flame concentrated area, change distance of the main heat release area of flame relative to combustor exit, the return path length for enabling internal pressure of combustion chamber pulsation reflect from combustor exit changes, pressure fluctuation and the phase difference of flame heat release rate change, so that the condition for originally meeting thermal acoustic oscillation is destroyed, and then realize that the reduction of internal pressure of combustion chamber pulsation even disappears.
Description
Technical field
The present invention relates to a kind of methods for inhibiting combustion pressure pulsation.
Background technique
Under certain operating condition, combustion chamber will generate some unexpected unstable situations, i.e., when acoustic pressure and
Between+90 ° and -90 °, the energy of combustion system will be amplified relative phase between unsteady heat release.If this
The energy of amplification is greater than the energy to dissipate on the boundary of combustion chamber, then the average net energy that a cycle of oscillation of combustion chamber accumulates
Amount just will increase, and eventually lead to the generation of thermal acoustic oscillation phenomenon.On the one hand, this wild effect can promote fuel-sky
The blending of gas enhances mixed effect, is conducive to the progress of burning；But on the other hand, this will lead to additional pressure, flow field and
The high amplitude of flame vibrates, and thermic load increases, and pollutant, which generates, to be aggravated, and the normal work of combustion chamber and system is centainly influenced,
It also will cause system unit damage when serious and destroy.
In above formula, particle rapidity is indicated, indicate pressure, be density, acoustic velocity and the rate of heat release for being unit volume.Deng
The formula left side (LHS) item describes the change rate of total sound energy (the sum of potential energy and kinetic energy) in combustion chamber volume V, first item on the right of equation
(RHS) indicate the energy exchange between unstable heat release and acoustic jamming, last indicate border surface etc. of combustion chamber because
Energy loss caused by element.Between the relative phase between acoustic pressure and unsteady heat release is spent between+90 degree and -90, it is
The energy of system can be amplified.It dissipates on the boundary of combustion chamber if the acoustic energy as provided by rough burning is greater than
Energy then the average energy of a cycle of oscillation of combustion chamber just will increase, and eventually leads to the generation of combustion instability.
Traditional control method for combustion chamber thermal acoustic oscillation can be divided mainly into active control and passive control two
Kind method.Passive control is directed to above formula right end Section 2, and controlling extent is limited larger, often operation item only in a certain range
Under part effectively.Active control is directed to above formula right end first item, i.e., certain parameters of combustion system are controlled by actuator, with interference
Heat release pulsation causes the condition of thermal acoustic oscillation in conjunction with Acoustic Disturbance, has system feedback good, there is preferable control effect,
Adaptable advantage；But traditional active control (such as machinery valve) is insufficient (usually less than there are still dynamic frequency is made simultaneously
100Hz), the problems such as actuation time delay is greatly and there are mechanical losses.
Summary of the invention
The present invention is to solve the existing method presence for inhibiting combustion pressure pulsation to make dynamic frequency deficiency, the actuation time prolongs
Late the technical issues of big and mechanical loss, and provide a kind of high frequency pumping discharge side surface plasma inhibition combustion pressure pulsation
Method.
High frequency pumping discharge side surface plasma of the invention inhibit combustion pressure pulsation method be according to the following steps into
Capable:
The DBD electrode of annular is disposed around on the side wall of combustion chamber, and height is located at the surrounding of flame, annular DBD
Electrode is connect with the output end of the power supply outside combustion chamber, and flammable premix gas is passed through into combustion chamber and is lighted, when in combustion chamber
When generating thermal acoustic oscillation phenomenon and adjoint a degree of pressure fluctuation, start the power supply outside combustion chamber, enables the DBD electricity of annular
Portion generates plasma discharge in the combustion chamber for pole, and acts on the side that thermal acoustic oscillation flame occurs for combustion chamber, adjusts
The discharge frequency of plasma is the integral multiple (1kHz-50kHz) of flame pulsation frequency, while the electric discharge for adjusting plasma is strong
Degree realizes the inhibition of internal pressure of combustion chamber pulsation.
The present invention, which generates plasma in the flame side of combustion chamber, will change the main heat release area (flame body) of flame relatively
In the distance of combustor exit, even the return path length that internal pressure of combustion chamber pulsation is reflected from combustor exit changes, pressure
Power is pulsed to change with the phase difference of flame heat release rate.Break the thermoacoustic vibration met between original flame heat release and acoustic pressure
Condition is swung, and then realizes the inhibition of internal pressure of combustion chamber pulsation.
The invention has the advantages that making flowing mode compared to traditional active control such as machinery valve etc., the present invention utilizes etc. from
Daughter can since the high frequency of its own makees dynamic characteristic (usually thousand hertz) as a kind of novel active control mode
The perfect frequency limit for solving traditional active control means and actuation time delay and the problems such as there are mechanical losses.From
It is seen in phenomenon, starting plasma can be seen burning interior flame and can obviously be adsorbed near electrode, and flame forms are stablized,
It is influenced by flow perturbation small.By connecting different power supplys, a series of influence degrees differences can be obtained by adjusting different parameters
Chamber pressure pulsation inhibit, slow down effect.For a Dynamic Burning pressure fluctuation, there is good feedback regulation to implement
Condition realizes the inhibition of optimum pressure pulsation, slows down effect by adjusting every relevant parameter.
The present invention meets one the flame of thermal acoustic oscillation condition in the combustion chamber, applies plasma in its lateral position
Electric discharge, can significantly change the phase difference of pressure fluctuation and rate of heat release, to break combustion chamber flame heat release and sound
Formation condition that is original between pressure, meeting thermal acoustic oscillation realizes slowing down for thermal acoustic oscillation phenomenon, and pressure fluctuation is inhibited,
And pressure fluctuation amplitude can slow down as 1/10th before.
Detailed description of the invention
Fig. 1 is the method schematic diagram tested medium-high frequency excitation discharge side surface plasma and inhibit combustion pressure pulsation；
Fig. 2 is the enlarged drawing of region A in Fig. 1.
Specific embodiment
Specific embodiment 1: present embodiment is that a kind of high frequency pumping discharge side surface plasma inhibits combustion pressure arteries and veins
Dynamic method specifically carries out according to the following steps:
The DBD electrode of annular is disposed around on the side wall of combustion chamber, and height is located at the surrounding of flame, annular DBD
Electrode is connect with the output end of the power supply outside combustion chamber, and flammable premix gas is passed through into combustion chamber and is lighted, when in combustion chamber
When generating thermal acoustic oscillation phenomenon and adjoint a degree of pressure fluctuation, start the power supply outside combustion chamber, enables the DBD electricity of annular
Portion generates plasma discharge in the combustion chamber for pole, and acts on the side that thermal acoustic oscillation flame occurs for combustion chamber, adjusts
The discharge frequency of plasma is the integral multiple (1kHz-50kHz) of flame pulsation frequency, while adjusting the electric discharge of plasma
Intensity realizes the inhibition of internal pressure of combustion chamber pulsation.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: the DBD electrode of the annular
By high-voltage electricity, extreme, dielectric and ground electrode end are formed；High-voltage electricity is extremely connect with the output end of the power supply outside combustion chamber,
Ground electrode end ground connection, dielectric are tightly attached to the inner wall of combustion chamber in a ring, and high-voltage electricity is extremely tightly attached to dielectric in a ring
Inner wall, ground electrode end is tightly attached to the inner wall of dielectric in a ring, and high-voltage electricity extremely holds row and high-field electrode level with both hands with ground electrode
End is located at the top at ground electrode end.Other are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: the power supply is arteries and veins
Power supply is rushed, voltage is 0~10kV, and pulse recurrence frequency maximum is up to 3kHz.Other are the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: the power supply
For AC power source, output voltage is 0~30kV, and frequency range is 1kHz~100kHz.Other and specific embodiment one to three
One of it is identical.
Specific embodiment 5: present embodiment is unlike specific embodiment four: the power supply is direct current friendship
Coupling power is flowed, i.e., is superimposed the power supply that a high-frequency and high-voltage alternating component two is formed in high voltage direct current, wherein DC power supply function
Rate is 10kW, electric current maximum 0.3A；Ac power frequency is 1kHz~100kHz, voltage 0-30kV.Other and specific implementation
Mode four is identical.
The present invention is verified with following tests:
Test one: this test is that a kind of high frequency pumping discharge centers plasma and side plasma body cooperative inhibit to burn
The method of pressure fluctuation specifically carries out according to the following steps as illustrated in fig. 1 and 2:
The DBD electrode 2 of annular is disposed around on the side wall of combustion chamber 1, and height is located at the surrounding of flame 7, it is annular
DBD electrode 2 is connect with the output end of the power supply 5 outside combustion chamber 1, the power supply 5 outside annular DBD electrode 2 and combustion chamber 1
Output end connection, flammable premix gas 6 is passed through into combustion chamber 1 and is lighted, when generation thermal acoustic oscillation phenomenon and adjoint in combustion chamber 1
When a degree of pressure fluctuation, start the power supply 5 outside combustion chamber 1, the DBD electrode 2 of annular is enabled to generate inside combustion chamber 1
Plasma discharge, and the side that thermal acoustic oscillation flame 7 occurs is acted on inside combustion chamber 1, adjust the electric discharge frequency of plasma
Rate is the integral multiple (1kHz-50kHz) of flame pulsation frequency, while adjusting the strength of discharge of plasma, realizes in combustion chamber 1
The inhibition of pressure fluctuation.
The DBD electrode 2 of the annular is made of the extreme 2-1 of high-voltage electricity, dielectric 2-2 and ground electrode end 2-3；High pressure
Electrode tip 2-1 is connect with the output end of the power supply 5 outside combustion chamber 1, ground electrode end 2-3 ground connection, and dielectric 2-2 is tight in a ring
It is affixed on the inner wall of combustion chamber 1, the extreme 2-1 of high-voltage electricity is tightly attached to the inner wall of dielectric 2-2 in a ring, and ground electrode end 2-3 is in ring
Shape is tightly attached to the inner wall of dielectric 2-2, and the extreme 2-1 of high-voltage electricity is parallel with ground electrode end 2-3 and the extreme 2-1 of high-voltage electricity is located at ground
The top of electrode tip 2-3；
The power supply 5 is AC power source；No. 3 are injection pipe, and 4 be constriction；
After in combustion chamber 1 a degree of thermal acoustic oscillation occurs for this test, power supply 5 is opened at the DBD electrode 2 of annular
Action of plasma is generated in the side of pulsating flame 7, the frequency for adjusting plasma is the integral multiple of flame pulsation frequency,
So that flame 7 is influenced by the fuel factor, chemical effect and galvanomagnetic-effect of plasma and enables it by the shadow of air-flow flow disturbance
It rings and reduces, heat release stability is accordingly improved；And the hot release rule of flame 7 is adjusted, the energy so that combustion chamber 1 is pulsed
Magnification level reduce, i.e., flow field influence of fluctuations combustion heat release rate fluctuation access separated, and then realize combustion chamber 1 in pressure
The reduction of pulsation even disappears.
Claims (8)
1. a kind of method that high frequency pumping discharge side surface plasma inhibits combustion pressure pulsation, it is characterised in that high frequency pumping is put
Electric side plasma inhibits the method for combustion pressure pulsation to carry out according to the following steps:
The DBD electrode of annular is disposed around on the side wall of combustion chamber, and height is located at the surrounding of flame, annular DBD electrode
It connect, flammable premix gas is passed through into combustion chamber and lights with the output end of the power supply outside combustion chamber, when being generated in combustion chamber
When thermal acoustic oscillation phenomenon and adjoint pressure fluctuation, start the power supply outside combustion chamber, adjusts the discharge frequency of plasma as fire
The integral multiple of flame ripple frequency, enabling annular DBD electrode, portion generates plasma discharge in the combustion chamber, and acts on combustion chamber
The side of thermal acoustic oscillation flame occurs for inside, and plasma adsorbs flame in the sidewall locations of combustion chamber, makes flame heat release collection
Middle area change, pressure fluctuation and the phase difference of flame heat release rate change, and realize the inhibition of internal pressure of combustion chamber pulsation；
Frequency, voltage or the current amplitude of plasma excitation power supply are adjusted, realizes that combustion pressure pulsation slows down or inhibits.
2. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the action of plasma that generates of the DBD electrode of annular in flame side and influence flame, and plasma is defeated
Enter energy to reache a certain level, flame body can be adsorbed near the DBD electrode of wall surface annular, the main heat release region of flame
Variation, and then change internal pressure of combustion chamber pulsation return path length, become the phase difference of pressure fluctuation and rate of heat release
Change, break the thermal acoustic oscillation condition met between original flame heat release and acoustic pressure, realizes the inhibition of internal pressure of combustion chamber pulsation.
3. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that plasma as a kind of novel active control mode, itself has, input energy is adjustable, no mechanical loss
The advantages of, capable of preferably solving the problem of the sphere of action of Traditional control means, small there are mechanical loss.
4. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that annular DBD electrode height position is controllable, different discharge positions can make plasma absorption flame body in not
At wall surface electrode, flame heat release concentrated area is adjustable along airflow direction position, the return path so that internal pressure of combustion chamber is pulsed
Length is adjustable, and the phase difference of pressure fluctuation and rate of heat release can be adjusted accordingly.
5. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the DBD electrode of the annular is by high-voltage electricity, extreme, dielectric and ground electrode end are formed；High-voltage electricity extremely with
The output end of power supply outside combustion chamber connects, and ground electrode end ground connection, dielectric is tightly attached to the inner wall of combustion chamber in a ring, high
Piezoelectricity is extremely tightly attached to the inner wall of dielectric in a ring, and the inner wall of dielectric, high-voltage electricity are tightly attached in ground electrode end in a ring
Extremely hold the top that capable and high-voltage electricity is extremely located at ground electrode end level with both hands with ground electrode；Multiple groups annular DBD electrode is along premixed gas stream
Dynamic direction is arranged in flame surrounding evenly and at intervals, realizes the adsorption effect in flame different height.
6. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the selection gist of plasma discharge frequency comprehensively consider combustion chamber heat sound oscillation basic frequency be 50Hz~
Plasma discharge frequency range is set as 1kHz~50kHz, plasma is enable effectively to adsorb flame body part by 200Hz
In wall surface annular DBD surrounding them.
7. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the power supply is the pulse power, voltage is 0~10kV, and pulse recurrence frequency maximum is up to 3kHz.
8. the method that a kind of high frequency pumping discharge side surface plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the power supply is AC power source, output voltage is 0~30kV, frequency range 1-100kHz.
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| CN114110664A (en) * | 2021-10-29 | 2022-03-01 | 南京航空航天大学 | Plasma synthetic jet combustion chamber |
| CN114183280A (en) * | 2021-12-13 | 2022-03-15 | 哈尔滨工业大学 | Method for regulating combustion heat release distribution by plasma |
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| CN112253317A (en) * | 2020-11-10 | 2021-01-22 | 上海电气燃气轮机有限公司 | Closed-loop combustion control system and control method thereof |
| CN112683542A (en) * | 2020-12-15 | 2021-04-20 | 上海交通大学 | Flame luminescence-based speed field measurement system and method |
| CN114110664A (en) * | 2021-10-29 | 2022-03-01 | 南京航空航天大学 | Plasma synthetic jet combustion chamber |
| CN114183280A (en) * | 2021-12-13 | 2022-03-15 | 哈尔滨工业大学 | Method for regulating combustion heat release distribution by plasma |
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