CN114183280A - Method for regulating combustion heat release distribution by plasma - Google Patents
Method for regulating combustion heat release distribution by plasma Download PDFInfo
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- CN114183280A CN114183280A CN202111514106.XA CN202111514106A CN114183280A CN 114183280 A CN114183280 A CN 114183280A CN 202111514106 A CN202111514106 A CN 202111514106A CN 114183280 A CN114183280 A CN 114183280A
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- heat release
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 10
- 239000000446 fuel Substances 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000002902 bimodal effect Effects 0.000 claims description 3
- 230000002925 chemical effect Effects 0.000 claims description 3
- 230000002195 synergetic effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000704 physical effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M27/00—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like
- F02M27/04—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like by electric means, ionisation, polarisation or magnetism
- F02M27/042—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like by electric means, ionisation, polarisation or magnetism by plasma
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a method for regulating combustion heat release distribution by plasma, which relates to the technical field of ramjet engines, wherein in an engine combustion chamber, discharge plasma acting on a combustion area is constructed, and the combustion heat release rate is improved by utilizing active particles in the discharge plasma; the space distribution of the active particles in the combustion zone is changed to influence the flame form development, so that the axial change of the combustion zone is caused, and the space distribution regulation of the combustion heat release rule is realized. The invention can realize the rapid regulation and control of the combustion heat release rate on a time scale and the combustion heat release intensity distribution in the combustion area on a space scale, and simultaneously reduces more thermodynamic energy consumption.
Description
Technical Field
The invention relates to the field of ramjet engines, in particular to an adjusting method for adjusting the heat release distribution rule in a combustion chamber of an engine.
Background
Aircraft engines have different flight performances under different incoming flows, heights and other conditions, and the flight performances are closely related to combustion structures in combustion chambers. Good combustion organization means stable combustion heat release in the combustion zone and good development of flame morphology, and the stability and controllability of the combustion heat release in the combustion zone have important value for safe operation of the engine, so that adjustment of the combustion heat release distribution in the combustion chamber of the engine is necessary. The combustion heat release distribution in the combustion chamber is generally changed by changing a fuel staged injection mode in the combustion chamber, namely, the change of the combustion heat release distribution is realized by changing the heat release quantity of fuel combustion and a heat release generation area through the adjustment and combination of modes such as fuel injection quantity, injection position, injection timing and the like under the coordination of airflow flowing conditions. However, the conventional mechanical thermal regulation method cannot rapidly regulate and control the combustion heat release rate on a time scale and the combustion heat release intensity distribution of a combustion area on a space scale.
Therefore, it is desirable to provide a new method for adjusting the heat release distribution of combustion in plasma to solve the above-mentioned problems in the prior art.
Disclosure of Invention
The invention aims to provide a method for adjusting combustion heat release distribution by using plasma, which is used for solving the problems in the prior art, realizing the rapid regulation and control of the combustion heat release rate on a time scale and the combustion heat release intensity distribution in a combustion area on a space scale, and reducing more thermodynamic energy consumption.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for regulating combustion heat release distribution by plasma, which comprises the steps of constructing discharge plasma acting on a combustion area in an engine combustion chamber, and improving the combustion heat release rate by utilizing active particles in the discharge plasma; the space distribution of the active particles in the combustion zone is changed to influence the flame form development, so that the axial change of the combustion zone is caused, and the space distribution regulation of the combustion heat release rule is realized.
Preferably, the discharge plasma is constructed and acts on a combustion area, active particles are injected into the central root of the flame in the initial stage of the formation of the diffusion flame, the combustion heat release rate of the action area is enhanced, and therefore the temperature change rate is improved;
under the synergistic action of airflow flow, the flame form is influenced to develop from a diffusion state to an active particle high-concentration region, so that the flame is adsorbed on a discharge end face to develop, namely, the spatial position of a combustion region is caused to move along the axial direction of the engine, the total temperature of each position along the engine is changed, and the spatial distribution regulation of a combustion heat release rule is formed.
Preferably, the discharge plasma has a plurality of different kinds of energetic active particles, and the progress of the combustion reaction can be accelerated through a physical effect level and a chemical effect level.
Preferably, the discharge plasma is generated by a plasma igniter fixed to a central position of the engine combustion chamber, and a discharge action region of the discharge plasma is located at a central axis of the engine combustion chamber.
Preferably, the plasma igniter is a plasma igniter generating a jet form, and the plasma igniter is fixed to a central position of the engine combustion chamber by a fixing structure.
Preferably, the fixing structure is a symmetrical structure.
Preferably, the injection position of the fuel in the engine combustion chamber is located on the front side of a discharge action region of the discharge plasma, and the fuel is horizontally injected in the direction of the discharge action region.
Preferably, the plasma igniter is externally connected with a power supply, the power supply comprises a direct current power supply and a pulse power supply, and the power supply is used independently or in a coupled mode.
Preferably, the current of the direct current power supply is 0.1A-200A;
the voltage of the pulse power supply is 0-10 kV, and the pulse repetition frequency can reach 100kHz at most.
Preferably, the engine combustion chamber is a scramjet engine combustion chamber, a sublagration ramjet engine combustion chamber or a bimodal engine combustion chamber.
Compared with the prior art, the invention has the following beneficial technical effects:
compared with the traditional combustion heat release distribution adjusting method in the engine combustion chamber, the method is quicker and more convenient, and the adjustment of the discharge parameters can realize the quick adjustment and control of the combustion heat release rate on a time scale and the combustion heat release intensity distribution of the combustion region on a space scale because the method directly acts on the flame of the combustion region, and simultaneously reduces more thermodynamic energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 shows a conventional flame combustion pattern in a combustion chamber of a scramjet engine;
FIG. 2 is a flame combustion pattern after a plasma igniter in a combustion chamber of a scramjet engine is turned on with a certain strong excitation power;
FIG. 3 is a conventional flame combustion pattern within a combustion chamber of a sub-combustion ramjet engine;
FIG. 4 is a flame combustion configuration after a plasma igniter in a combustion chamber of a sub-combustion ramjet is turned on with a certain strong excitation power;
FIG. 5 is a schematic diagram of the variation of the heat release profile along the way for a validation implementation of a scramjet engine;
wherein, 1 is the combustion chamber inner wall, 2 is fixed knot structure, and 3 is plasma body point firearm.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method for adjusting combustion heat release distribution by using plasma, which is used for solving the problems in the prior art, realizing the rapid regulation and control of the combustion heat release rate on a time scale and the combustion heat release intensity distribution in a combustion area on a space scale, and reducing more thermodynamic energy consumption.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 1-2, the present embodiment provides a method for adjusting the combustion heat release distribution by plasma, in a combustion chamber of an engine, constructing plasma acting on a combustion area, and utilizing a large amount of high-energy active particles therein to increase the combustion heat release rate; the flame form is influenced to develop from a diffusion state to an active particle high concentration region by changing the spatial distribution of high-energy active particles in the combustion region, so that the axial change of the main combustion region is caused, and the spatial distribution regulation of the combustion heat release rule is realized.
In the embodiment, the discharge plasma has a large amount of high-energy active particles of different types, and physical processes such as diffusion atomization of the fuel can be accelerated; because the active groups contained in the catalyst can accelerate the progress of combustion reaction at the chemical effect level, the combustion heat release rate of the action area of the catalyst is enhanced, and the temperature change rate is improved; the discharge plasma is constructed to directly act on the combustion area, the spatial distribution of the plasma is changed, and under the synergistic action of airflow flowing at a certain flow speed, the combustion area is induced to mainly occur in a space where the plasma exists, so that flame is adsorbed on the discharge end face to develop, namely, the spatial position of the main combustion area is caused to move along the axial direction of the engine, the total temperature of each position along the way of the engine can be changed, and the spatial distribution regulation of the combustion heat release rule is formed.
In this embodiment, a jet form of discharge plasma may be generated using a plasma igniter.
In this embodiment, the engine combustion chamber may be a scramjet combustion chamber, a sub-ramjet combustion chamber, or a dual-mode engine combustion chamber.
The present embodiment is performed as follows:
(1) air flows into the engine; (2) engine fuel injection into the engine; (3) combustion in a stable common flame form is formed in the engine combustion chamber; (4) the plasma igniter is switched to work with certain strong power.
The embodiment provides an engine combustion chamber layout based on the method for adjusting combustion heat release distribution by plasma, the engine combustion chamber is a scramjet engine combustion chamber, a plasma igniter 3 is fixed at the central position of the combustion chamber by a fixing structure 2, and an internal electrode of the plasma igniter 3 is connected with the output end of a power supply outside the scramjet engine combustion chamber; the injection position of the fuel in the combustion chamber of the scramjet engine is positioned at the front side of the discharge action area, and the fuel is horizontally injected towards the discharge action area.
In this embodiment, the fixing structure 2 is provided in the combustion chamber inner wall 1, and the plasma igniter 3 is fixed to the center position by the fixing structure 2, thereby keeping the plasma generated at the center axis position all the time.
The fixed structure 2 is preferably a symmetrical structure and comprises support plates which are symmetrical up and down, and the plasma igniter 3 is arranged between the support plates; alternatively, the fixing structure 2 may be another structure or an asymmetrical structure as long as the plasma igniter 3 can be fixed to the center of the combustion chamber.
In this embodiment, the power source is a DC and pulse power source, and the current range of the DC power source is 0.1A-50A; the voltage range of the pulse power supply is 0-10 kV, and the pulse repetition frequency can reach 100kHz at most.
Example two
The embodiment is an improvement on the basis of the first embodiment, and the improvement is as follows:
the engine combustion chamber is a sub-combustion ramjet engine combustion chamber, the combustion heat release distribution rule adjusting method is shown in figures 3-4, and the engine combustion chamber is generally in an equal straight section type.
EXAMPLE III
The embodiment is an improvement on the basis of the first embodiment or the second embodiment, and the improvement is as follows:
the engine combustion chamber is a bimodal ramjet combustion chamber, and the overall modeling structure of the combustion chamber is similar to that of a general scramjet engine.
The present example was verified as follows:
(1) air flows into the engine; (2) engine fuel injection into the engine; (3) the plasma igniter is started at a certain excitation intensity of a single power supply, and stable central flame combustion is formed in the engine combustion chamber; (4) the plasma igniter is switched on with a certain strong power of the coupled power supply.
According to the verification result of the operation of the steps, after the plasma igniter is started at a certain strong excitation power through the enhancement effect of the discharge plasma on the combustion heat release, the total temperature of the engine along the way is integrally higher than that of the engine along the way in the common flame form, as shown in fig. 5, it can be seen that: the heat release of the whole combustion in the combustion chamber is enhanced; the central flame configuration in the engine of fig. 1 can be promoted to the axially shifted flame configuration of the main combustion zone of fig. 2 by constructing the central discharge plasma to act on the flame root and adjust the discharge excitation parameters by using the change of the plasma distribution in the combustion zone, as shown in fig. 1-2. The variation location advance phenomenon is greatly enhanced by the heat release in the heat release profile of fig. 5, which realizes a change in the spatial distribution of the combustion heat release.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A method for regulating the heat release distribution of combustion by plasma is characterized in that: in an engine combustion chamber, constructing discharge plasma acting on a combustion area, and utilizing active particles in the discharge plasma to improve the combustion heat release rate; the space distribution of the active particles in the combustion zone is changed to influence the flame form development, so that the axial change of the combustion zone is caused, and the space distribution regulation of the combustion heat release rule is realized.
2. The method of claim 1, wherein the step of adjusting the heat release profile comprises: the discharge plasma is constructed and acts on a combustion area, active particles are injected into the central root of the flame at the initial stage of the formation of diffusion flame, the combustion heat release rate of the action area is enhanced, and therefore the temperature change rate is improved;
under the synergistic action of airflow flow, the flame form is influenced to develop from a diffusion state to an active particle high-concentration region, so that the flame is adsorbed on a discharge end face to develop, namely, the spatial position of a combustion region is caused to move along the axial direction of the engine, the total temperature of each position along the engine is changed, and the spatial distribution regulation of a combustion heat release rule is formed.
3. The method of claim 2, wherein the step of adjusting the heat release profile comprises: the discharge plasma has various kinds of high-energy active particles, and can accelerate the process of combustion reaction through a physical effect level and a chemical effect level.
4. The method of claim 1, wherein the step of adjusting the heat release profile comprises: and generating the discharge plasma by using a plasma igniter, wherein the plasma igniter is fixed at the central position of the engine combustion chamber, and the discharge action area of the discharge plasma is positioned at the central axis of the engine combustion chamber.
5. The method of claim 4, wherein the step of generating the plasma modified combustion heat release profile comprises: the plasma igniter is a plasma igniter which generates jet flow, and the plasma igniter is fixed at the central position of the engine combustion chamber through a fixing structure.
6. The method of claim 5, wherein the step of adjusting the heat release profile comprises: the fixing structure adopts a symmetrical structure.
7. The method of claim 4, wherein the step of generating the plasma modified combustion heat release profile comprises: the injection position of the fuel in the engine combustion chamber is positioned at the front side of a discharge action area of the discharge plasma, and the fuel is horizontally injected towards the direction of the discharge action area.
8. The method of claim 4, wherein the step of generating the plasma modified combustion heat release profile comprises: the plasma igniter is externally connected with a power supply, the power supply comprises a direct current power supply and a pulse power supply, and the power supply is used independently or in a coupling mode.
9. The method of claim 8, wherein the step of adjusting the heat release profile comprises:
the current of the direct current power supply is 0.1-200A;
the voltage of the pulse power supply is 0-10 kV, and the pulse repetition frequency can reach 100kHz at most.
10. The method of claim 1, wherein the step of adjusting the heat release profile comprises: the engine combustion chamber is a scramjet engine combustion chamber, a sublagration ramjet engine combustion chamber or a bimodal engine combustion chamber.
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| CN202111514106.XA CN114183280A (en) | 2021-12-13 | 2021-12-13 | Method for regulating combustion heat release distribution by plasma |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115628464A (en) * | 2022-10-12 | 2023-01-20 | 哈尔滨工业大学 | Three-channel scramjet engine combustion chamber |
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| CN109724107A (en) * | 2018-12-29 | 2019-05-07 | 哈尔滨工业大学 | A kind of method that high frequency pumping discharge side surface plasma inhibits combustion pressure pulsation |
| CN209562888U (en) * | 2018-10-22 | 2019-10-29 | 安徽工业大学 | Coaxial resonant microwave discharge plasma efficient combustion-supporting device |
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2021
- 2021-12-13 CN CN202111514106.XA patent/CN114183280A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100186368A1 (en) * | 2007-07-12 | 2010-07-29 | Imagineering, Inc. | Ignition/ chemical reaction promotion/ flame holding device, speed-type internal combustion engine, and furnace |
| CN102798149A (en) * | 2012-07-26 | 2012-11-28 | 中国人民解放军装备学院 | Plasma concave-cavity flame stabilizer for engine |
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| CN108151062A (en) * | 2017-12-20 | 2018-06-12 | 哈尔滨工业大学 | A kind of engine supersonic speed combustion chamber based on embedded central plasma torch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115628464A (en) * | 2022-10-12 | 2023-01-20 | 哈尔滨工业大学 | Three-channel scramjet engine combustion chamber |
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