CN115478938B - Large-area mixed gas pretreatment combustion control method and system - Google Patents
Large-area mixed gas pretreatment combustion control method and system Download PDFInfo
- Publication number
- CN115478938B CN115478938B CN202211260034.5A CN202211260034A CN115478938B CN 115478938 B CN115478938 B CN 115478938B CN 202211260034 A CN202211260034 A CN 202211260034A CN 115478938 B CN115478938 B CN 115478938B
- Authority
- CN
- China
- Prior art keywords
- electrode
- pretreatment
- area
- discharge
- mixed gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000004048 modification Effects 0.000 claims abstract description 11
- 238000012986 modification Methods 0.000 claims abstract description 11
- 230000004888 barrier function Effects 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 36
- 238000007781 pre-processing Methods 0.000 abstract description 5
- 230000000051 modifying effect Effects 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- -1 electrons Chemical class 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B51/00—Other methods of operating engines involving pretreating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines
- F02B51/04—Other methods of operating engines involving pretreating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines involving electricity or magnetism
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Plasma Technology (AREA)
Abstract
The invention discloses a combustion control method and a combustion control system for preprocessing a large-area mixed gas, wherein the combustion control method is used for modifying the mixed gas by exciting a dielectric barrier electrode through high-frequency high-voltage fast pulse; the large-area mixed gas pretreatment system comprises a high-frequency high-voltage fast pulse generator and a large-area body pretreatment electrode, wherein the large-area pretreatment electrode is arranged in a combustor; the invention excites the dielectric barrier electrode by high-frequency high-voltage fast pulse, when the burner is at lower chamber pressure, a large-area low-temperature plasma discharge channel is generated in the combustion chamber, the discharge channel can carry out modification treatment on the mixed gas, and the activity of the mixed gas is controlled, so that the whole combustion process is controlled.
Description
Technical Field
The invention relates to the technical field of power devices such as internal combustion engines, in particular to a large-area mixed gas pretreatment combustion control method and system.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The unbalanced plasma auxiliary combustion technology is a novel combustion technology which is rapidly rising in recent years. The technology can greatly improve the reactivity by ionizing neutral gaseous molecules into charged heavy ions and electrons under a certain voltage, thereby improving the reactivity of reactants and expanding the lean limit. However, the method has a problem that the discharge effect of the unbalanced plasma discharge is greatly affected by the gas pressure condition, and it is difficult to achieve effective ionization under the high pressure condition. For example, at the moment of ignition of an internal combustion engine, the in-cylinder pressure is high, and therefore, the technical route of adopting unbalanced plasma ignition in the engine cylinder, which is related to the related patent, is difficult to realize.
By contrast, the method of ionizing fuel, air or mixed gas under the low pressure condition of the air inlet channel position by adopting the means of unbalanced plasma combustion supporting can improve the reactivity of reactants, and has the potential of improving the ignition capability of the lean-burn internal combustion engine and improving the economy and the emission of the internal combustion engine. However, the method has the problems that an ionization device is arranged at the inlet valve, the treatment time is limited, the air inlet time is long, and the loss of plasma active particles is more after the treatment gas enters the cylinder.
Since the charged ions, electrons, radicals and thermal effects generated by the discharge exist for a short time, generally in the order of microseconds and milliseconds, the effect of the mode of externally generating plasma and then injecting the plasma into the combustion chamber for combustion supporting is not ideal, the active particles are rapidly reduced before ignition, and the combustion enhancing capability is reduced. Therefore, how to provide a combustion control method capable of ensuring that a cylinder has enough active particles and stronger thermal effect so as to improve the ignition capability and flame propagation speed when a combustion chamber is lean-burn, thereby improving the economy of combustion and reducing emission is a problem to be solved at present.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a large-area mixed gas pretreatment combustion control method and a system, which control the activity of the mixed gas by carrying out modification pretreatment on the mixed gas so as to control the whole combustion process.
The technical scheme of the invention is as follows:
In a first aspect of the present invention, a control method for pretreating and burning a large-area gas mixture is provided, wherein a dielectric barrier electrode is excited by high-frequency high-voltage fast pulse, and the gas mixture is subjected to modification treatment, which specifically comprises the following steps:
selecting a pretreatment low-pressure section according to the working pressure range of the burner;
Obtaining limit value ranges of discharge parameters under different pressures according to the electrode parameters and the mixed gas parameters;
the pretreatment parameters are set according to the working condition and the combustion control requirement of the burner.
In some embodiments of the present invention, the low-voltage pretreatment stage is selected based on the principle that a large discharge area can be generated under the pulse operation parameters, and the discharge reduced field intensity satisfies the following conditions: E/N >20Td.
In some embodiments of the invention, the gas mixture parameters include temperature, composition, humidity.
In some embodiments of the invention, the discharge parameters include pulse time width, pulse time interval, pulse amplitude, pulse number.
In some embodiments of the invention, the limit value range of the discharge parameter is selected in such a way that a fire pit is formed in the range, and the discharge parameter cannot be exceeded during the pretreatment.
In some embodiments of the present invention, setting the preprocessing parameters specifically includes the steps of:
according to the working process and working condition of the burner, determining the time-varying condition of the low-pressure section of the pretreatment, and further determining the pretreatment duration;
the pretreatment pressure or pressure segment and the discharge parameters at that pressure or pressure segment are determined based on the combustion control requirements.
In some embodiments of the invention, the discharge parameters are changed as the pressure segment is preconditioned.
In a second aspect of the invention, a large area gas mixture pretreatment system is provided that includes a high frequency high voltage fast pulse generator and a large area bulk pretreatment electrode disposed within a combustor.
In some embodiments of the invention, the large area preconditioning electrode comprises an outer electrode, an inner electrode, and an insulating medium; the external electrode is arranged at the central shaft of the large-area pretreatment electrode, one end of the external electrode extends out of one side of the large-area pretreatment electrode and is electrically connected with the positive electrode or the negative electrode of the high-frequency high-voltage pulse generator, and the other end of the external electrode extends out of the other side of the large-area pretreatment electrode in a truncated cone-shaped structure; the inner electrode is connected with the negative electrode of the high-frequency high-voltage pulse generator electrically or positively.
In some embodiments of the invention, the insulating medium comprises an insulating thin layer and an insulating structure, and in the working area, the inner electrode and the outer electrode are separated by the insulating thin layer, and in other areas, the inner electrode and the outer electrode are separated by the insulating structure.
One or more of the technical schemes of the invention has the following beneficial effects:
(1) The control method for the pretreatment combustion of the large-area mixed gas provided by the invention directly excites the mixed gas in the combustion chamber to generate active particles and a thermal effect, and has better combustion-supporting effect. The ignition device can ensure that enough active particles and stronger thermal effect are possessed in the cylinder at the ignition moment, and can improve the ignition capability and flame propagation speed of the combustion chamber during lean combustion, thereby improving the economy of combustion and reducing emission.
(2) The large-area mixed gas pretreatment system provided by the invention has the advantages that the high-frequency nanosecond pulse dielectric barrier discharge can generate a large-area discharge area, the plasma can be uniformly distributed on the surface of the electrode, the discharge current can reach tens of amperes, and the energy of the input mixed gas under the same pulse parameters is equivalent to that of arc discharge. Because the energy distribution is not concentrated enough, and the dielectric layer blocks the formation of sparks, the high-frequency nanosecond pulse dielectric blocks the temperature of discharge plasma to be very low, but the chemical activity of the mixed gas can be excited, the discharge is not ignited, the mixed gas is modified, and the combustion process of the mixed gas is controlled.
(3) The large-area pretreatment electrode provided by the invention has the advantages that the internal electrode and the external electrode cannot be completely broken down due to the existence of an inter-electrode insulating medium, and the voltage between the two electrodes is higher during discharge; and the discharge channels are distributed along the junction medium, the gap between the discharge channels and the inner electrode is small, and the reduced field intensity of the discharge channels is high. The non-equilibrium plasma of the discharge channel can generate a large amount of active free radicals, and simultaneously, the mixed gas is rapidly heated to trigger the low-temperature chemical reaction of the fuel, so that the fuel is modified under the condition of no ignition, and the chemical activity of the mixed gas is increased.
(4) The large-area pretreatment electrode is arranged in the combustion chamber to directly pretreat the mixed gas, and the interval time between the combustion and pretreatment time processes is short, so that the concentration of active free radicals of the pretreatment gas is higher, the chemical activity is better, and the heating effect generated by discharge can also influence the combustion process.
(5) The combustion control method provided by the invention is used for preprocessing the mixed gas when the combustion chamber is at a lower pressure, so that a large-area discharge channel can be generated under a relatively lower pulse amplitude, the mixed gas preprocessing effect is enhanced, and the performance requirement of a preprocessing system on the high-frequency high-voltage pulse generator is reduced.
(6) In the invention, under the excitation of fast pulse, a plurality of wire-shaped discharge channels can be generated at the edge of the external electrode which is centrosymmetric, so that a large-area low-temperature plasma channel is formed, the pretreatment area is increased, and the pretreatment modification effect is enhanced.
(7) The discharge channel can be developed and increased along the surface of the insulating medium to form a large-range discharge channel; after pretreatment modification, the activity of the mixed gas is changed, the mixed gas is maintained in a high-activity state within a certain time range, the combustion speed of the mixed gas is increased, and the ignition delay of the mixed gas is reduced.
(8) The invention can conveniently control the combustion effect, including the magnitude and the maintenance time of the activity of the fire gas mixture, by regulating and controlling the fast pulse parameters, thereby controlling the combustion speed and the ignition delay; the parameters can be adjusted in real time according to the working condition of the engine, and the combustion of the engine is optimized.
Drawings
FIG. 1 is a schematic diagram of a large-area gas mixture pretreatment system according to the present invention;
FIG. 2 is a schematic diagram of a large area preconditioning electrode in accordance with the present invention;
FIG. 3 (a) is a schematic bottom view of the large area preconditioning electrode of FIG. 2;
FIG. 3 (b) is a schematic bottom view of the large area preconditioning electrode of FIG. 2;
FIG. 3 (c) is a schematic bottom view of the large area preconditioning electrode of FIG. 2;
FIG. 4 is a schematic view of a large area preconditioning electrode in accordance with the present invention;
FIG. 5 is a schematic view of a large area preconditioning electrode in accordance with the present invention;
FIG. 6 (a) is a schematic bottom view of the large area preconditioning electrode of FIG. 5;
FIG. 6 (b) is a schematic view of a bottom view of the large area preconditioning electrode of FIG. 5;
FIG. 6 (c) is a schematic bottom view of the large area preconditioning electrode of FIG. 5;
FIG. 7 is a schematic view of a large area preconditioning electrode of the invention;
FIG. 8 is a contrast of a schlieren image of the effect of the presence or absence of pretreatment in a constant volume projectile on the combustion process;
FIG. 9 is a graph of a discharge effect of a large area preconditioning electrode of the invention;
FIG. 10 (a) shows the control of the ignition effect by the high-voltage fast pulse parameters at different pulse numbers at the time intervals after the pretreatment;
fig. 10 (b) shows the control of the ignition effect by the high-voltage fast pulse parameters at different ignition time intervals after the pretreatment.
In the figure: 1. an insulating thin layer; 2. an external electrode; 2.1, annular external electrode with round edge; 2.2, annular external electrodes with hexagonal edges; 2.3, annular external electrodes with serrated edges; 2.4, a solid outer electrode with a round edge; 2.5, solid external electrodes with hexagonal edges; 2.6, solid external electrode with serrated edge; 3. an inner electrode; 4. an insulating structure.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
For convenience of description, the words "upper", "lower", "left" and "right" in the present invention, if they mean only that the directions are consistent with the upper, lower, left, and right directions of the drawings per se, and do not limit the structure, only for convenience of description and simplification of the description, but do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
In a typical implementation mode of the invention, a large-area mixed gas pretreatment combustion control method is provided, and the mixed gas is subjected to modification treatment by exciting a dielectric barrier electrode through high-frequency high-voltage fast pulse, and specifically comprises the following steps:
selecting a pretreatment low-pressure section according to the working pressure range of the burner; because the non-equilibrium plasma discharge area and the generated active components are influenced by pressure, the discharge area is reduced under high pressure, and the generation of the active components is difficult, the proper pretreatment low-pressure section is required to be selected according to the working pressure range of the burner, the selection principle of the pretreatment low-pressure section is that the discharge area with large area can be generated under the pulse working parameters, the discharge reduction field intensity is in a higher state, and the discharge reduction field intensity meets the following conditions: E/N >20Td.
Obtaining limit value ranges of discharge parameters under different pressures according to the electrode parameters and the mixed gas parameters; the electrode parameters comprise electrode diameter, electrode curvature radius, insulating layer thickness, electrode material, electrode structure and the like, the gas mixture parameters comprise temperature, components, humidity and the like, the discharge parameters comprise pulse time width, pulse time interval, pulse amplitude, pulse number and the like, the discharge parameters are combinations of a plurality of parameters, the limit value range of the discharge parameters is selected in such a principle that a fire core can be formed in the range, and the discharge parameters cannot exceed the range during pretreatment.
The pretreatment parameters are set according to the working condition and the combustion control requirement of the burner. The pretreatment parameter setting specifically comprises the following steps:
firstly, determining the time-varying condition of a pretreatment low-pressure section according to the working process and working condition of a burner, and further determining the pretreatment duration; then, the preconditioning pressure or pressure segment and the discharge parameters (pulse time width, pulse time interval, pulse amplitude, pulse number, etc.) at that pressure or pressure segment are determined based on the combustion control requirements. If the pretreatment is performed in the pressure section, the discharge parameters may be changed as the pressure changes.
According to the control method for the pretreatment combustion of the large-area mixed gas, the dielectric barrier electrode is excited by high-frequency high-voltage fast pulse, when the burner is at a lower chamber pressure, a large-area low-temperature plasma discharge channel is generated in the burner, the discharge channel can carry out modification treatment on the mixed gas, and the activity of the mixed gas is controlled, so that the whole combustion process is controlled. The method can realize the regulation and control of the combustion speed according to the working condition of the burner by controlling the high-frequency high-voltage fast pulse parameters (voltage amplitude, frequency, pulse number, pulse width and the like).
Taking a combustion constant volume bomb as an example, the combustion control method is described:
the initial temperature is 300K, the equivalence ratio phi=1, the pretreatment electrode is arranged on the right side wall surface of the constant volume bomb, the pretreatment pressure is determined to be a constant value of 1bar, the working processes of different combustors are different, the pretreatment pressure section selection is also different, for example, the gas inlet process and the compression process of a gasoline engine, the in-cylinder pressure is continuously changed from 1bar to 14bar, and the proper pretreatment pressure section can be selected according to the requirement. Fig. 8 is a contrast of a schlieren image of the presence or absence of pretreatment in a constant volume projectile, PI indicating pulse interval (us) and PN indicating pulse number. By image comparison, a thermal effect area and a chemical activity enhancement area can be formed on the pretreated electrode side after pretreatment, so that obvious wrinkles are formed on the flame surface, and the flame propagation is accelerated.
In order to achieve the aim of the mixture pretreatment, the mixture cannot be ignited during the pretreatment, so that it is necessary to determine the limit value of the discharge parameter, which is a combination of parameters, for example, a set of limit values of the discharge parameter under the experimental conditions of —pulse amplitude (15 kV), pulse interval (80 us), pulse number (200), pulse time width (40 ns) ]. The real-time regulation and control of the combustion effect can be realized by regulating and controlling the parameters (pulse amplitude, pulse frequency, pulse time width, pulse number and ignition interval) of the high-voltage fast pulse; fig. 10 (a) and 10 (b) show the control of the high-voltage fast pulse parameters to the ignition effect at different pulse numbers and at different time intervals between the ignition time and the pre-treatment time, respectively, wherein fig. 10 (a) shows the combustion at different pulse numbers, fig. 10 (b) shows the combustion at different ignition time intervals, PI shows the pulse interval, PN shows the pulse number, and TI shows the time interval between the ignition time and the pre-treatment end time. As can be seen from fig. 10, as the number of pulses increases, the thermal effect region and the chemical active region significantly increase, and the combustion speed increases; along with the increase of the ignition time interval, the pretreatment enhancement effect is gradually weakened, the combustion speed is gradually reduced, and the adjustable parameters of the high-frequency high-voltage fast pulse generator can form various combinations, so that the device is suitable for different working conditions and achieves the expected combustion effect.
Example 2
In an exemplary embodiment of the present invention, a large area gas mixture pretreatment system is provided, as shown in FIG. 1, comprising a high frequency high voltage fast pulse generator and a large area bulk pretreatment electrode, the large area pretreatment electrode being disposed within a combustor; the large-area pretreatment electrode comprises an outer electrode 2, an inner electrode 3 and an insulating medium; the external electrode 2 is arranged at the central axis of the large-area pretreatment electrode, one end of the external electrode 2 extends out of one side of the large-area pretreatment electrode and then is connected with the positive electrode of the high-frequency high-voltage pulse generator, and the other end of the external electrode extends out of the other side of the large-area pretreatment electrode in a truncated cone-shaped structure; the inner electrode 3 is connected with the negative electrode of the high-frequency high-voltage pulse generator, and the polarities of the electrodes can be exchanged.
The insulating medium comprises an insulating thin layer 1 and an insulating structure 4, and in the working area, the inner electrode and the outer electrode are separated by the insulating thin layer 1, and other areas are separated by the insulating structure 4.
The high frequency high voltage fast pulse generator of fig. 1 can generate high frequency (> 5 kHz) high voltage fast pulses (voltage rise rate >1kV/us including but not limited to repeated ns pulses, high frequency AC, etc.) whose discharge parameters (pulse amplitude, pulse frequency, pulse time width, pulse number) are adjustable. The high-voltage fast pulse is applied to the large-area low-temperature plasma pretreatment electrode to generate large-area multichannel discharge unbalanced plasma, so that a plurality of discharge channels are formed, and the large-area mixed gas modification treatment is realized.
As shown in fig. 2-7, the large area bulk preconditioning electrodes can take a variety of different configurations.
As shown in fig. 2, the large-area body pretreatment electrode comprises an insulating thin layer 1, an outer electrode 2, an inner electrode 3 and an insulating structure 4, wherein the insulating thin layer and the insulating structure can be made of glass, ceramic or heat-resistant high polymer materials. The outer electrode adopts an annular outer electrode, the annular outer electrode is positioned at the axis, the inner electrode is positioned at the periphery, the range of the inner electrode is larger than that of the outer electrode, and the discharge channel diverges from the outer edge of the inner ring to the outer ring of the outer electrode. When high-voltage fast pulses (voltage rise rate >1kV/us, including but not limited to repeated ns pulses, high-frequency AC, etc.) with high frequency (> 5 kHz) are applied to both ends of the inner and outer electrodes, a plurality of wire-like discharge channels are generated on the surface of the insulating thin layer 1, and the discharge effect is as shown in FIG. 9, and white dendrites are discharge wires.
As shown in fig. 3 (a) - (c), the edge of the protruding part of the external electrode can be designed to have different curvatures, for example, an annular external electrode 2.1 with a round edge, an annular external electrode 2.2 with a hexagonal edge, and an annular external electrode 2.3 with a sawtooth-shaped edge, and the edge can also be designed to have other non-centrosymmetric shapes with stronger electric fields where the curvature is large, so that the discharge channels are more easily broken down, the number of the discharge channels is controlled, and a large-area discharge is formed. Therefore, the number and distribution of the discharge channels can be changed by adjusting the number and distribution of the high-curvature parts, the treatment area and intensity can be controlled, and the combustion enhancement effect can be further adjusted.
As shown in fig. 4, the inner electrode and the insulating thin layer in the working area may not be planar, and this structure may reduce the relative contact area between the surface of the discharge wire and the insulating thin layer, reduce heat dissipation, increase the contact area between the discharge wire and the fresh gas mixture, and improve the gas mixture modifying effect.
As shown in fig. 5 and 6, the outer electrode may be a solid electrode, and also the edge of the protruding portion of the outer electrode may be designed with different curvatures, for example, a solid outer electrode 2.4 with a circular edge, a solid outer electrode 2.5 with a hexagonal edge, and a solid outer electrode 2.6 with a serrated edge.
As shown in fig. 7, the positions of the inner and outer electrodes can be exchanged, the outer electrode 2 is wider than the inner electrode 3, and the discharge channel is developed from the inner edge of the outer electrode toward the center. This structure can limit the maximum distribution range of the discharge wire by changing the size of the external electrode.
The large-area body pretreatment electrodes with different structures can be combined for use, and the large-area mixed gas pretreatment system provided by the embodiment designs the structure of the electrode, changes the number and distribution of discharge channels by adjusting the number and distribution of high-curvature parts, controls the treatment area and intensity, and further adjusts the combustion enhancement effect.
According to the large-area mixed gas pretreatment system provided by the embodiment, the mixed gas pretreatment effect is controlled by controlling the high-frequency high-voltage fast pulse parameters, wherein the parameters comprise pulse time width, pulse interval time, pulse amplitude, pulse number and the like, when the high-frequency high-voltage fast pulse is applied to the two ends of the inner electrode and the outer electrode, a plurality of wire discharge channels which develop along the surface of the insulating thin layer are generated at the edge of the protruding part of the outer electrode, so that large-area low-temperature plasma is formed, the mixed gas is subjected to modification treatment, and the chemical activity of the mixed gas is increased. According to the application scene, the control of the combustion process, such as flame combustion speed and ignition delay, is realized by controlling the high-frequency high-voltage fast pulse parameters and the structural design of the large-area low-temperature plasma pretreatment electrode.
While the foregoing embodiments have been described in detail in connection with the embodiments of the invention, it should be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like made within the principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The combustion control method of the large-area mixed gas pretreatment system comprises a high-frequency high-voltage fast pulse generator and a large-area body pretreatment electrode, wherein the large-area pretreatment electrode is arranged in a combustor;
The large-area pretreatment electrode comprises an outer electrode, an inner electrode and an insulating medium; the external electrode is arranged at the central axis of the large-area pretreatment electrode, one end of the external electrode extends out of one side of the large-area pretreatment electrode and is connected with the positive electrode or the negative electrode of the high-frequency high-voltage pulse generator, the external electrode adopts an annular external electrode, the annular external electrode is positioned at the axis, the internal electrode is positioned at the periphery, the range of the internal electrode is larger than that of the external electrode, and the discharge channel diverges from the outer edge of the internal ring to the outer edge of the external electrode; the inner electrode is connected with a negative electrode or a positive electrode of the high-frequency high-voltage pulse generator;
The method is characterized in that the control method excites the dielectric barrier electrode through high-frequency high-voltage fast pulse to carry out modification treatment on the mixed gas, and specifically comprises the following steps:
selecting a pretreatment low-pressure section according to the working pressure range of the burner;
Obtaining limit value ranges of discharge parameters under different pressures according to the electrode parameters and the mixed gas parameters;
Setting pretreatment parameters according to the working condition and the combustion control requirement of the burner;
the selection principle of the pretreatment low-voltage section is that a large-area discharge area can be generated under the pulse working parameters, and meanwhile, the discharge reduced field intensity meets the following conditions: E/N >20Td;
The pretreatment parameter setting specifically comprises the following steps:
according to the working process and working condition of the burner, determining the time-varying condition of the low-pressure section of the pretreatment, and further determining the pretreatment duration;
Determining a pretreatment pressure or pressure section and a discharge parameter at the pressure or pressure section according to the combustion control demand; the limit value range of the discharge parameter is selected in such a way that a fire core is formed in the range, and the discharge parameter cannot exceed the range during pretreatment.
2. The method for combustion control of a large area gas mixture pretreatment system as recited in claim 1, wherein said gas mixture parameters include temperature, composition, humidity.
3. The method of combustion control of a large area gas mixture pretreatment system of claim 1, wherein said discharge parameters comprise pulse time width, pulse time interval, pulse amplitude, pulse number.
4. The combustion control method of a large area gas mixture pretreatment system according to claim 1, wherein the discharge parameter is changed with a pressure change when the pressure section is pretreated.
5. The combustion control method of the large-area gas mixture pretreatment system according to claim 1, wherein the insulating medium comprises an insulating thin layer and an insulating structure, and in the working area, the inner electrode and the outer electrode are separated by the insulating thin layer, and the other area is isolated by the insulating structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211260034.5A CN115478938B (en) | 2022-10-14 | 2022-10-14 | Large-area mixed gas pretreatment combustion control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211260034.5A CN115478938B (en) | 2022-10-14 | 2022-10-14 | Large-area mixed gas pretreatment combustion control method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115478938A CN115478938A (en) | 2022-12-16 |
| CN115478938B true CN115478938B (en) | 2024-08-09 |
Family
ID=84395992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211260034.5A Active CN115478938B (en) | 2022-10-14 | 2022-10-14 | Large-area mixed gas pretreatment combustion control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115478938B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357048A (en) * | 2021-07-28 | 2021-09-07 | 中国人民解放军国防科技大学 | Scramjet engine combustion enhancement device based on dielectric barrier discharge |
| CN114704416A (en) * | 2022-04-12 | 2022-07-05 | 山东大学 | Multichannel discharge large-area distributed ignition system and method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080054395A (en) * | 2005-09-09 | 2008-06-17 | 비티유 인터내셔날, 인코포레이티드 | Microwave combustion system for internal combustion engines |
| JP5119879B2 (en) * | 2007-11-16 | 2013-01-16 | 日産自動車株式会社 | Non-equilibrium plasma discharge control device and non-equilibrium plasma discharge control method for internal combustion engine |
| US20090165436A1 (en) * | 2007-12-28 | 2009-07-02 | General Electric Company | Premixed, preswirled plasma-assisted pilot |
| CN112377322B (en) * | 2020-05-26 | 2021-10-22 | 北京礴德恒激光科技有限公司 | Piston discharge structure for plasma cloud excitation homogeneous uniform combustion engine |
| US11346317B1 (en) * | 2021-05-19 | 2022-05-31 | Hyundai Motor Company | Ignition system for dual mode ignition and engine having the same |
| CN114718765A (en) * | 2022-04-19 | 2022-07-08 | 南京理工大学 | Arc igniter for micro-nano satellite |
-
2022
- 2022-10-14 CN CN202211260034.5A patent/CN115478938B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357048A (en) * | 2021-07-28 | 2021-09-07 | 中国人民解放军国防科技大学 | Scramjet engine combustion enhancement device based on dielectric barrier discharge |
| CN114704416A (en) * | 2022-04-12 | 2022-07-05 | 山东大学 | Multichannel discharge large-area distributed ignition system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115478938A (en) | 2022-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2256534C (en) | Traveling spark ignition system and ignitor therefor | |
| JP4731591B2 (en) | Ignition system and method for generating and sustaining a corona discharge for igniting a combustible gas mixture | |
| JP5062629B2 (en) | High frequency plasma spark plug | |
| US6321733B1 (en) | Traveling spark ignition system and ignitor therefor | |
| US10550820B2 (en) | Time-varying spark current magnitude to improve spark plug performance and durability | |
| KR101932367B1 (en) | An ignition assembly and a method of igniting a combustible fuel mixture in a combustion chamber of an internal combustion piston engine | |
| CN1556564A (en) | Ultra high energy spark plug | |
| KR20140045340A (en) | System, circuit, and method for controlling combustion | |
| WO2016075361A1 (en) | Lean-burn internal combustion gas engine provided with a dielectric barrier discharge plasma ignition device within a combustion prechamber | |
| WO2016075358A1 (en) | A prechamber assembly adaptable in a cylinder head of an internal combustion engine and a cylinder head | |
| WO2017093598A1 (en) | A microwave plasma ignition assembly | |
| KR20060032626A (en) | Plasma-jet spark plug | |
| CN115478938B (en) | Large-area mixed gas pretreatment combustion control method and system | |
| KR20230037235A (en) | System of controlling multi- ignition coil | |
| EP2743496B1 (en) | Plasma generating device, and internal combustion engine | |
| JP2000110697A (en) | Lean burn gas engine | |
| CN114704416A (en) | Multichannel discharge large-area distributed ignition system and method | |
| Jose et al. | Review on performance of high energy ignition techniques | |
| CN112004304B (en) | Corona composite dielectric barrier discharge plasma jet generating device | |
| JP3297328B2 (en) | Ignition device for internal combustion engine | |
| CN113464313B (en) | Parallel type multipath sliding arc plasma igniter and scramjet engine | |
| KR101634094B1 (en) | Lean-burn method using plasma jet | |
| RU2343651C1 (en) | Pulse-periodic plasmatron | |
| US5569976A (en) | Ion emmiter based on cold cathode discharge | |
| RU2731462C1 (en) | Method of preparing gaseous fuel and air before feeding into fuel-burning device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |