CN109729634A - A kind of method that high frequency pumping discharge centers plasma inhibits combustion pressure pulsation - Google Patents
A kind of method that high frequency pumping discharge centers plasma inhibits combustion pressure pulsation Download PDFInfo
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- CN109729634A CN109729634A CN201811635818.5A CN201811635818A CN109729634A CN 109729634 A CN109729634 A CN 109729634A CN 201811635818 A CN201811635818 A CN 201811635818A CN 109729634 A CN109729634 A CN 109729634A
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Abstract
A kind of method that high frequency pumping discharge centers 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 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 in the flame root of combustion chamber, so that flame is dynamically influenced by plasma and is influenced to reduce by flow perturbation, heat release stability is accordingly improved, and the phase and frequency of flame heat release is adjusted, so that the magnification level of combustion chamber pulsation energy reduces, the condition of thermal acoustic oscillation is destroyed, and then realizes 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.
Traditional control method for combustion chamber thermal acoustic oscillation can be divided mainly into active control and passive control two
Kind method.Passively controlling extent is limited larger, often under operating condition only in a certain range effectively.Active control passes through
Actuator controls certain parameters of combustion system, to interfere heat release pulsation to cause the item of thermal acoustic oscillation in conjunction with Acoustic Disturbance
Part has system feedback good, there is preferable control effect, adaptable advantage；But traditional active control is (such as machinery simultaneously
Valve) there are still making, dynamic frequency insufficient (usually less than 100Hz), actuation time delay is big and there are mechanical losses etc. to ask
Topic.
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 centers plasma inhibition combustion pressure pulsation
Method.
High frequency pumping discharge centers plasma of the invention inhibit combustion pressure pulsation method be according to the following steps into
Capable:
Metal electrode is placed at the center of entry of combustion chamber, the output end of the power supply outside metal electrode and combustion chamber connects
It connects, flammable premix gas is passed through into combustion chamber and lights, it is simultaneously adjoint a degree of when generating thermal acoustic oscillation phenomenon in combustion chamber
When pressure fluctuation, start the power supply outside combustion chamber, enabling metal electrode, portion generates plasma discharge in the combustion chamber, and acts on
The root of thermal acoustic oscillation flame occurs in combustion chamber, the discharge frequency for adjusting plasma is the integer of flame pulsation frequency
Again (1kHz-50kHz), while the strength of discharge of plasma is adjusted, realizes the inhibition of internal pressure of combustion chamber pulsation.
The present invention generates plasma in the flame root of combustion chamber and makes flame dynamically by the thermal effect of plasma
Answer, the influence of chemical effect and galvanomagnetic-effect and influenced to reduce by flow perturbation, heat release stability is accordingly improved, and
The phase and frequency of flame heat release is adjusted, so that the magnification level of combustion chamber pulsation energy reduces, the item of thermal acoustic oscillation
Part is destroyed, and then realizes that the reduction of internal pressure of combustion chamber pulsation even disappears.
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 using the different power supply of different electrode forms, connection, adjusting different parameters can be obtained
A series of different chamber pressure pulsation of influence degrees inhibits, slows down effect.For a Dynamic Burning pressure fluctuation, have
Good feedback regulation implementation 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 at its root
Electric discharge, can significantly change flame heat release rule, thus break between combustion chamber flame heat release and acoustic pressure it is original,
Meet the formation condition of thermal acoustic oscillation, realizes slowing down for thermal acoustic oscillation phenomenon, pressure fluctuation is inhibited, and pressure fluctuation width
Degree 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 centers plasma and inhibit combustion pressure pulsation；
Fig. 2 is the method schematic diagram tested two medium-high frequencies excitation discharge centers plasma and inhibit combustion pressure pulsation；
Fig. 3 is the method schematic diagram tested three medium-high frequencies excitation discharge centers plasma and inhibit combustion pressure pulsation；
Fig. 4 is the enlarged drawing of region A in Fig. 3.
Specific embodiment
Specific embodiment 1: present embodiment is that a kind of high frequency pumping discharge centers plasma inhibits combustion pressure arteries and veins
Dynamic method specifically carries out according to the following steps:
Metal electrode is placed at the center of entry of combustion chamber, the output end of the power supply outside metal electrode and combustion chamber connects
It connects, flammable premix gas is passed through into combustion chamber and lights, it is simultaneously adjoint a degree of when generating thermal acoustic oscillation phenomenon in combustion chamber
When pressure fluctuation, start the power supply outside combustion chamber, enabling metal electrode, portion generates plasma discharge in the combustion chamber, and acts on
The root of thermal acoustic oscillation flame occurs in combustion chamber, the discharge frequency for adjusting plasma is the integer of flame pulsation frequency
Again (1kHz-50kHz), while the strength of discharge (by adjusting voltage) of plasma is adjusted, realizes internal pressure of combustion chamber pulsation
Inhibition.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: the metal electrode is gold
Belong to suspension single electrode, the lower end of metal suspension single electrode and the output end of the power supply outside combustion chamber are connected, made with infinite point
For ground electrode.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 metal electrode
For metal bipolar electrode, a pair of of metal bipolar electrode is mounted near the root of flame, is in positioned opposite, two electricity of metal bipolar electrode
Pole is connected with the output end of the power supply outside combustion chamber and ground wire respectively.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 metal
Electrode is DBD electrode, and the DBD electrode is made of the quartz wedge of two circular foil members and a correspondingly-sized, two
In positioned opposite, quartz wedge is arranged in two sheet metals and sticks in a circular foil member circular foil member,
Adhesion has the circular foil member of quartz wedge extreme as high-voltage electricity, connect with the output end of the power supply outside combustion chamber；It is another
Sheet metal is connected as ground terminal with ground wire.Other are identical as one of specific embodiment one to three.
Specific embodiment 5: present embodiment is unlike specific embodiment four: the power supply is pulse electricity
Source, low-temperature plasma electrical source or DC communication coupling power.Other are identical as specific embodiment four.
The present invention is verified with following tests:
Test one: this test is a kind of method that high frequency pumping discharge centers plasma inhibits combustion pressure pulsation, such as
Shown in Fig. 1, specifically carry out according to the following steps:
Metal single electrode 2 is placed at the center of 1 entrance of combustion chamber, the power supply 5 outside metal single electrode 2 and combustion chamber 1
Output end connection, the mixing gas 6 of methane air is passed through into combustion chamber 1 and is lighted, when in combustion chamber 1 generate thermoacoustic vibration
When swinging phenomenon and adjoint pressure fluctuation to a certain degree, start the power supply 5 outside combustion chamber, metal single electrode 2 is inside combustion chamber 1
Plasma discharge is generated, and acts on inside combustion chamber 1 root that thermal acoustic oscillation flame 7 occurs, adjusts putting for plasma
Electric frequency is the integral multiple of flame pulsation frequency, while adjusting the strength of discharge of plasma, realizes internal pressure of combustion chamber pulsation
Inhibition；
The lower end of the metal single electrode 2 is connect with the output end of the power supply 5 outside combustion chamber 1；
The power supply 5 is the pulse power；No. 3 are injection pipe, and 4 be constriction；
After in combustion chamber 1 a degree of thermal acoustic oscillation occurs for this test, opens power supply 5 and generated at metal electrode 2
Action of plasma is in the root of pulsating flame 7, and the frequency for adjusting plasma is the multiple of flame pulsation frequency, so that flame
7 by plasma fuel factor, chemical effect and galvanomagnetic-effect influenced and enable its by air-flow flow disturbance influenced reduce, release
Thermal stability is accordingly improved；And the hot release rule of flame 7 is adjusted, the amplification journey of energy so that combustion chamber 1 is pulsed
Degree reduces, i.e. the access of flow field influence of fluctuations combustion heat release rate fluctuation is separated, and then realizes that pressure fluctuation subtracts in combustion chamber 1
Small or even disappearance.
Test two: this test is a kind of method that high frequency pumping discharge centers plasma inhibits combustion pressure pulsation, such as
Shown in Fig. 2, specifically carry out according to the following steps:
Metal bipolar electrode 8 is placed at the center of 1 entrance of combustion chamber, metal bipolar electrode 8 respectively with the electricity outside combustion chamber 1
The output end in source 5 is connected with ground electrode, and the mixing gas 6 of methane air is passed through into combustion chamber 1 and is lighted, when in combustion chamber 1
When generating thermal acoustic oscillation phenomenon and adjoint pressure fluctuation to a certain degree, start the power supply 5 outside combustion chamber, metal bipolar electrode 8 exists
Plasma discharge is generated inside combustion chamber 1, and acts on inside combustion chamber 1 root that thermal acoustic oscillation flame 7 occurs, adjust etc.
The discharge frequency of gas ions is the integral multiple of flame pulsation frequency, while adjusting the strength of discharge of plasma, realizes combustion chamber
The inhibition of interior pressure fluctuation；
The power supply 5 is low-temperature plasma electrical source；No. 3 are injection pipe, and 4 be constriction.
Test three: this test is a kind of method that high frequency pumping discharge centers plasma inhibits combustion pressure pulsation, such as
Shown in Fig. 3 and 4, specifically carry out according to the following steps:
DBD electrode 9 is placed at the center of 1 entrance of combustion chamber, outside the extreme 9-1 of the high-voltage electricity of DBD electrode 9 and combustion chamber 1
The output end of the power supply 5 in portion connects, and dielectric 9-2, the ground electrode of DBD electrode 9 is arranged in the extreme 9-1 of the high-voltage electricity of DBD electrode 9
9-3 ground connection is held, the mixing gas 6 of methane air is passed through into combustion chamber 1 and is lighted, it is existing when generating thermal acoustic oscillation in combustion chamber 1
When as and with pressure fluctuation to a certain degree, start the power supply 5 outside combustion chamber, DBD electrode 9 generates inside combustion chamber 1 etc.
Plasma discharge, and the root that thermal acoustic oscillation flame 7 occurs is acted on inside combustion chamber 1, adjust the discharge frequency of plasma
For the integral multiple of flame pulsation frequency, while the strength of discharge of plasma is adjusted, realizes the inhibition of internal pressure of combustion chamber pulsation；
The power supply 5 is DC communication coupling power；No. 3 are injection pipe, and 4 be constriction.
Claims (10)
1. a kind of method that high frequency pumping discharge centers plasma inhibits combustion pressure pulsation, it is characterised in that high frequency pumping is put
Electrfic centre plasma inhibits the method for combustion pressure pulsation to carry out according to the following steps:
Metal electrode is placed at the center of entry of combustion chamber, metal electrode is connect with the output end of the power supply outside combustion chamber,
It is passed through gas into combustion chamber and lights, when generating pressure fluctuation in combustion chamber, starts the power supply outside combustion chamber, metal electricity
Portion generates plasma discharge in the combustion chamber for pole, and acts on the root that thermal acoustic oscillation flame occurs for combustion chamber, adjusts
The discharge frequency of plasma is the integral multiple of flame pulsation frequency, while adjusting the strength of discharge of plasma, realizes to combustion
Burn the inhibition of room pressure pulsation.
2. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the action of plasma that metal electrode generates in flame and influences flame, and plasma discharge frequency should impose
The integral multiple of flame pulsation basic frequency, is dynamically influenced in that flame, so that suspension flame is adsorbed in metal electrode nearby and enables flame
Pulsation changes to the responsiveness of flow perturbation, the frequency of flame heat release and phase rule, to break original flame
The thermal acoustic oscillation condition met between 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 centers 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 by the range of 200Hz.
4. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that plasma, as a kind of novel active control mode, the high frequency itself having makees dynamic characteristic, response is fast, has
Standby closed loop feedback implementation condition, no mechanical loss, when can preferably solve frequency limit and the actuation of Traditional control means
Between delay issue.
5. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the metal electrode is metal suspension single electrode, the lower end of metal suspension single electrode and the electricity outside combustion chamber
The output end in source connects, using infinite point as ground electrode.
6. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the metal electrode is metal bipolar electrode, a pair of of metal bipolar electrode is mounted near the root of flame, is in phase
To arrangement, two electrodes of metal bipolar electrode are connected with the output end of the power supply outside combustion chamber and ground wire respectively.
7. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the metal electrode is DBD electrode, the DBD electrode is by two circular foil members and a corresponding ruler
Very little quartz wedge composition, in positioned opposite, quartz wedge is arranged in two sheet metals and sticks in two circular foil members
In one circular foil member, adhesion has the circular foil member of quartz wedge extreme as high-voltage electricity, with the electricity outside combustion chamber
The output end in source connects；Another sheet metal is connected as ground terminal with ground wire.
8. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the power supply is the pulse power, voltage 0-10kV, pulse recurrence frequency maximum is up to 3kHz.
9. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the power supply is AC power source, output voltage 0-30kV, frequency range 1-100kHz.
10. the method that a kind of high frequency pumping discharge centers plasma according to claim 1 inhibits combustion pressure pulsation,
It is characterized in that the power supply is DC communication coupling power, i.e., a high-frequency and high-voltage alternating component is superimposed in high voltage direct current
Two power supplys formed, wherein Dc source power is 10kW, electric current maximum 0.3A；Ac power frequency is 1kHz~100kHz,
Voltage is 0-30kV.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111043623A (en) * | 2019-12-30 | 2020-04-21 | 哈尔滨工业大学 | Method for preventing combustion chamber from generating resonance based on closed-loop negative feedback regulation of electric field influencing flame root |
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