CN103343983B - Supersonic-speed stable combustion method based on strong magnetic field stable electric arc - Google Patents
Supersonic-speed stable combustion method based on strong magnetic field stable electric arc Download PDFInfo
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- CN103343983B CN103343983B CN201310328927.3A CN201310328927A CN103343983B CN 103343983 B CN103343983 B CN 103343983B CN 201310328927 A CN201310328927 A CN 201310328927A CN 103343983 B CN103343983 B CN 103343983B
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Abstract
The invention relates to a supersonic-speed stable combustion method based on a strong magnetic field stable electric arc, relates to a supersonic-speed combustion method of an engine combustion chamber, and aims at solving the problems in the existing supporting plate/concave cavity-type combustion method that the geometric dimension is large, the flow loss is large and the supersonic speed combustion performance is low. The method comprises the following steps of: A, plating a ceramic film on each of the inner surfaces of a first through hole, a second through hole, a third through hole, a fourth through hole, a fifth through hole and a sixth through hole; B, connecting a fuel injection hole with a fuel pipe, respectively placing three first electrodes into the first through hole, the second through hole and the third through hole, and respectively placing a second electrode into each of the fourth through hole, the fifth through hole and the sixth through hole; C, injecting fuel into the engine combustion chamber from the fuel injection hole; D, respectively connecting the three first electrodes with a negative electrode of a direct-current high-voltage power supply, and respectively connecting the three second electrodes with a positive electrode of the direct-current high-voltage power supply; E, arranging a magnetic field in the direction which is vertical to the axial direction of the engine main combustion chamber. The supersonic-speed stable combustion method is used for the supersonic-speed combustion.
Description
Technical field
The present invention relates to a kind of engine chamber supersonic combustion method, be specifically related to a kind of stable supersonic combustion method based on high-intensity magnetic field stable arc.
Background technology
In supersonic combustion technology, flame stabilization measure is the necessary mode of supersonic combustion.Incoming flow is in a combustion chamber with supersonic flows, and the viscous flow time only has several milliseconds, and igniting and the smooth combustion that will realize fuel within the short time like this are very difficult.
Traditional engine chamber supersonic combustion flame stabilizing method has support plate/cavity formula combustion method and utilizes the method for plasma-activated effect smooth combustion.Support plate/cavity formula combustion method at present conventionally stabilizes the flame method, in order to stabilize the flame, require that the geometric scale of support plate/cavity is comparatively large, to build the low speed whirlpool district of large scale, be beneficial to fuel gas at this region sufficient dwell time to form stable thermal-flame.The low speed whirlpool district building large scale in supersonic speed combustion chamber often brings larger flow losses, reduces supersonic combustion efficiency.
Plasma technique is applied to supersonic combustion and causes extensive concern, and this technology utilizes the activation of plasma to bring out the chain combustion reaction of fuel, enhanced burning reaction speed, reduces the ignition delay time of fuel.By supersonic flows transport effect, plasma-induced formed extensive chemical active group can spread to downstream, and then make plasma excitation active region often be distributed in certain space, it can not concentrate on certain region, high density plasma district can not be formed, or strong combustion zone.This distribution characteristics is that the action of plasma under supersonic combustion brings certain use constraint.
Summary of the invention
The object of the invention is for solving geometric scale in existing support plate/cavity formula combustion method larger, cause that flow losses are large, supersonic combustion performance is low, and adopt due to the problem that plasma diffusion causes plasma effect to lose in jet plasma ignition method, and a kind of stable supersonic combustion method based on high-intensity magnetic field stable arc is proposed.
The inventive method is realized by following steps:
Step one, center line on any sidewall of engine main chamber is processed with injection hole, the first through hole is processed with after injection hole, second through hole, third through-hole, fourth hole, fifth hole and the 6th through hole, the center of the first through hole, the center of the second through hole and the center of third through-hole are on same straight line, the center of fourth hole, the center of fifth hole and the center of the 6th through hole are on same straight line, first through hole and fourth hole are symmetrical arranged with center line, first through hole, second through hole, third through-hole, fourth hole, the inner surface of fifth hole and the 6th through hole is all coated with ceramic membrane,
Step 2, the input of injection hole to be connected with fuel pipe, three first electrodes to be separately positioned in the first through hole, the second through hole and third through-hole, three second electrodes to be separately positioned in fourth hole, fifth hole and the 6th through hole;
Step 3, fuel oil is injected in engine chamber by injection hole;
Step 4, three first electrodes to be all connected with DC high-voltage power supply negative pole, three second electrodes are all connected with DC high-voltage power supply positive pole, wherein, high-voltage power voltage is 500V ~ 1000V, electric current is 10A ~ 100A, and high electrical breakdown burning indoor gas produces electric arc, and then produces a large amount of energetic plasmas by electric arc, through injection hole inject fuel in region by plasma rapid fire, realize supersonic flow condition down-firing and smooth combustion;
Step 5, on the axial direction perpendicular to engine main chamber, arrange magnetic field, the direction in magnetic field is vertical with the direction of incoming flow, and wherein, magnetic induction intensity is 0.5T ~ 2T; Plasma in arc zone is subject to the magnetic field force contrary with carrying out flow path direction, assembles a large amount of plasmas in arc zone, forms reliable burning.
The present invention compared with prior art has following beneficial effect: one, the present invention is not coming to increase any support plate and cavity in circulation road, there is not low speed whirlpool district, there are not flow losses; The present invention utilizes high-intensity magnetic field to carry out the spatial distribution characteristic of stable arc plasma, form the high density plasma in certain area, produce the supersonic combustion district of local strengthening, to form the antihunt means of supersonic speed flame, reduce flow losses, improve supersonic combustion performance; Electric arc produces a large amount of plasma, and the activation of plasma is used for igniting, and stressed make of arc current in magnetic field assembles a large amount of energetic plasma in zonule, can reduce the time needed for igniting in large quantities; Two, stability and the voltage strength of electric arc is only depended in the smooth combustion of incoming flow; Three, adopt magnetic field plasma to retrain, also not exist when utilizing plasma igniting in supersonic flow owing to spreading damnous phenomenon.
Accompanying drawing explanation
Fig. 1 is injection hole 1-1 in the step one, two of the specific embodiment of the present invention one, the first through hole 1-2, the second through hole 1-3, third through-hole 1-4, fourth hole 1-5, fifth hole 1-6, the 6th through hole 1-7, the first electrode 3 and the second electrode 4 position view (marking 7 in figure for fuel oil stream), Fig. 2 is the A-A sectional view of Fig. 1.
Detailed description of the invention
Detailed description of the invention one: composition graphs 1 and Fig. 2 illustrate present embodiment, and present embodiment is realized by following steps:
Step one, center line N-N on any sidewall of engine main chamber 1 is processed with injection hole 1-1, the first through hole 1-2 is processed with after injection hole 1-1, second through hole 1-3, third through-hole 1-4, fourth hole 1-5, fifth hole 1-6 and the 6th through hole 1-7, the center of the first through hole 1-2, the center of the second through hole 1-3 and the center of third through-hole 1-4 are on same straight line, the center of fourth hole 1-5, the center of fifth hole 1-6 and the center of the 6th through hole 1-7 are on same straight line, first through hole 1-2 and fourth hole 1-5 is symmetrical arranged with center line N-N, first through hole 1-2, second through hole 1-3, third through-hole 1-4, fourth hole 1-5, the inner surface of fifth hole 1-6 and the 6th through hole 1-7 is all coated with ceramic membrane, the voltage request at electrode two ends can puncture the gas in main chamber, forms electric arc, the effect mainly insulating effect of ceramic membrane.
Step 2, the input of injection hole 1-1 to be connected with fuel pipe 2, three first electrodes 3 are separately positioned in the first through hole 1-2, the second through hole 1-3 and third through-hole 1-4, three second electrodes 4 are separately positioned in fourth hole 1-5, fifth hole 1-6 and the 6th through hole 1-7;
Step 3, fuel oil is injected in engine chamber 1 by injection hole 1-1; The position of injection hole 1-1 should enable fuel flow through electric arc region.
Step 4, three first electrodes 3 to be all connected with DC high-voltage power supply negative pole, three second electrodes 4 are all connected with DC high-voltage power supply positive pole, wherein, high-voltage power voltage V is 500V ~ 1000V, electric current is 10A ~ 100A, and high electrical breakdown burning indoor gas produces electric arc, and then produces a large amount of energetic plasmas by electric arc, through injection hole 1-1 inject fuel in electric arc region 6 by plasma rapid fire, realize supersonic flow condition down-firing and smooth combustion; It is active that plasma in electric arc region 6 has very extensive chemical, the active group that induction generation is a large amount of, and then form the active combustion district, local depending on plasma, enhances supersonic combustion speed.And this combustion flame can on engine wall stable existence, thus realize supersonic flow condition down-firing and smooth combustion.
Step 5, on the axial direction perpendicular to engine main chamber 1, arrange magnetic field, the direction of magnetic field B is vertical with the direction of incoming flow K, and wherein, magnetic induction intensity is 0.5T ~ 2T; According to left hand rule, left hand is put into magnetic field, allow magnetic induction line vertically penetrate the palm of the hand, the palm of the hand is towards N pole, and four refer to point to electric current direction, then the direction of thumb is exactly the stressed direction of conductor; Plasma in arc zone 5 is subject to the magnetic field force contrary with incoming flow K direction, guarantee that arc energy remains in arc zone 5, in arc zone 5, assemble a large amount of plasmas, avoid the loss caused due to the diffusion of plasma, form reliable burning.The arrangement of magnetic field B should make electric arc constrain in a narrow regions.Such design make to start owner burn in this zonule in assemble a large amount of energetic plasma, reduce the time needed for igniting.
Detailed description of the invention two: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is the first through hole 1-2 in step one, the second through hole 1-3, third through-hole 1-4, fourth hole 1-5, fifth hole 1-6 and the 6th through hole 1-7 the thickness of inner surface ceramic membrane be 0.1mm ~ 0.2mm.Ceramic membrane achieves the insulating effect between plasma and wall, and ceramic membrane can produce secondary under the collision of plasma, is conducive to plasma stable propagation in through-holes.Other step is identical with detailed description of the invention one.
Detailed description of the invention three: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is the first through hole 1-2 in step one, the second through hole 1-3, third through-hole 1-4, fourth hole 1-5, fifth hole 1-6 and the 6th through hole 1-7 the thickness of inner surface ceramic membrane be 0.15mm.Ceramic membrane achieves the insulating effect between plasma and wall, and ceramic membrane can produce secondary under the collision of plasma, is conducive to plasma stable propagation in through-holes.Other step is identical with detailed description of the invention two.
Detailed description of the invention four: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is the axis that the arrangement of the first electrode 3 in step 2 and the second electrode 4 should make sense of current vertical engine.Magnetic field intensity is enough to constraint arc, and the sense of current should arranged according to step one and left hand rule determine the direction in magnetic field.Such design makes plasma be constrained on one comparatively in zonule.Other step and detailed description of the invention one, two or three identical.
Detailed description of the invention five: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is that the diameter of the first electrode 3 and the second electrode 4 in step 2 is 3mm ~ 6mm.Such design forms high-intensity magnetic field after making electrode add high voltage in a combustion chamber.Other step is identical with detailed description of the invention four.
Detailed description of the invention six: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is that the diameter of the first electrode 3 and the second electrode 4 in step 2 is 5mm.Other step is identical with detailed description of the invention five.
Detailed description of the invention seven: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is that the voltage at the first electrode 3 and the second electrode 4 two ends in step 4 is 700V.Other step is identical with detailed description of the invention six.
Detailed description of the invention eight: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is that the voltage at the first electrode 3 and the second electrode 4 two ends in step 4 is 850V.Other step is identical with detailed description of the invention six.
Detailed description of the invention nine: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is the magnetic induction intensity in step 5 is 1T.Such design makes the plasma in region of discharge be subject to magnetic field force effect can be gathered in a zonule.Other step and detailed description of the invention one, seven or eight identical.
Detailed description of the invention ten: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is the magnetic induction intensity in step 5 is 1.5T.Such design makes the plasma in region of discharge be subject to magnetic field force effect can be gathered in a zonule.Other step and detailed description of the invention one, seven or eight identical.
Claims (10)
1. based on a stable supersonic combustion method for high-intensity magnetic field stable arc, it is characterized in that: described method is realized by following steps:
Step one, center line (N-N) on any sidewall of engine main chamber (1) is processed with injection hole (1-1), after injection hole (1-1), is processed with the first through hole (1-2), second through hole (1-3), third through-hole (1-4), fourth hole (1-5), fifth hole (1-6) and the 6th through hole (1-7), the center of the first through hole (1-2), the center of the second through hole (1-3) and the center of third through-hole (1-4) on same straight line, the center of fourth hole (1-5), the center of fifth hole (1-6) and the center of the 6th through hole (1-7) are on same straight line, first through hole (1-2) and fourth hole (1-5) are symmetrical arranged with center line (N-N), the first through hole (1-2), second through hole (1-3), third through-hole (1-4), fourth hole (1-5), the inner surface of fifth hole (1-6) and the 6th through hole (1-7) is all coated with ceramic membrane,
Step 2, the input of injection hole (1-1) to be connected with fuel pipe (2), three first electrodes (3) are separately positioned in the first through hole (1-2), the second through hole (1-3) and third through-hole (1-4), three second electrodes (4) are separately positioned in fourth hole (1-5), fifth hole (1-6) and the 6th through hole (1-7);
Step 3, fuel oil is injected in engine chamber (1) by injection hole (1-1);
Step 4, three first electrodes (3) to be all connected with DC high-voltage power supply negative pole, three second electrodes (4) are all connected with DC high-voltage power supply positive pole, wherein, high-voltage power voltage is 500V ~ 1000V, electric current is 10A ~ 100A, high electrical breakdown burning indoor gas produces electric arc, and then produce a large amount of energetic plasmas by electric arc, the fuel injected through injection hole (1-1) by plasma rapid fire, realizes supersonic flow condition down-firing and smooth combustion in region (6);
Step 5, on the axial direction perpendicular to engine main chamber (1), arrange magnetic field, the direction of magnetic field (B) is vertical with the direction of incoming flow (K), and wherein, magnetic induction intensity is 0.5T ~ 2T; Plasma in arc zone (5) is subject to the magnetic field force contrary with incoming flow (K) direction, assembles a large amount of plasmas, form reliable burning in arc zone (5).
2. according to claim 1 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: the thickness of the inner surface ceramic membrane of the first through hole (1-2) in described step one, the second through hole (1-3), third through-hole (1-4), fourth hole (1-5), fifth hole (1-6) and the 6th through hole (1-7) is 0.1mm ~ 0.2mm.
3. according to claim 2 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: the thickness of the inner surface ceramic membrane of the first through hole (1-2) in described step one, the second through hole (1-3), third through-hole (1-4), fourth hole (1-5), fifth hole (1-6) and the 6th through hole (1-7) is 0.15mm.
4. according to claim arbitrary in claims 1 to 3 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: the first electrode (3) in described step 2 and the arrangement of the second electrode (4) should make the axis of sense of current vertical engine.
5. according to claim 4 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: in described step 2, the diameter of the first electrode (3) and the second electrode (4) is 3mm ~ 6mm.
6. according to claim 5 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: in described step 2, the diameter of the first electrode (3) and the second electrode (4) is 5mm.
7. according to claim 6 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: in described step 4, the voltage at the first electrode (3) and the second electrode (4) two ends is 700V.
8. according to claim 6 based on the stable supersonic combustion method of high-intensity magnetic field stable arc, it is characterized in that: in described step 4, the voltage at the first electrode (3) and the second electrode (4) two ends is 850V.
9. according to claim 1,7 or 8 based on the stable supersonic combustion method of stable arc, it is characterized in that: the magnetic induction intensity in described step 5 is 1T.
10. according to claim 1,7 or 8 based on the stable supersonic combustion method of stable arc, it is characterized in that: the magnetic induction intensity in described step 5 is 1.5T.
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| CN108151062B (en) * | 2017-12-20 | 2019-06-11 | 哈尔滨工业大学 | A kind of engine supersonic speed combustion chamber based on embedded central plasma torch |
| CN109059044A (en) * | 2018-07-13 | 2018-12-21 | 湖南云顶智能科技有限公司 | A kind of supporting plate spray burner and ignition method being provided with pulse firing source |
| CN109462928B (en) * | 2018-12-29 | 2021-06-29 | 哈尔滨工业大学 | Method for cooperatively inhibiting combustion pressure pulsation by high-frequency excitation discharge central plasma and side plasma |
| CN111623374B (en) * | 2020-04-30 | 2022-01-07 | 中国人民解放军空军工程大学 | Device and method for regulating and controlling tail edge flow of v-shaped flame stabilizer by surface arc plasma excitation |
| CN111706877B (en) * | 2020-05-29 | 2022-07-15 | 中国人民解放军空军工程大学 | Sliding arc plasma excitation type concave cavity flame stabilizer |
| CN111794865B (en) * | 2020-05-29 | 2021-12-10 | 中国人民解放军空军工程大学 | Linear plasma igniter and ignition method for flow direction of scramjet combustion chamber |
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