Multi-capacitor parallel pulse type plasma excitation device

Abstract

The invention provides a multi-capacitor parallel pulse type plasma excitation device, which comprises a high-voltage pulse power supply, a direct-current power supply, a signal generator, an energy storage capacitor, an electronic switch, a diode, a protective resistor, an electrode matrix, an insulating flat plate, a circuit probe and a signal amplifier, the device can generate high-frequency and high-energy arc excitation on the premise that single pulse excitation energy is not reduced, meanwhile, the excitation intensity, the excitation frequency, the discharge power and the working time can be regulated and controlled, and the device is fast in response, low in power consumption and high in energy utilization rate; the method is not limited by the discharge frequency, the control capability is higher, the control energy input is more flexible, and the application range of the plasma exciter in the technical field of wide-area aircraft flow control is greatly expanded.

Description

Technical Field

[0001] The present invention relates to a plasma generating device, and more particularly to a pulsed plasma excitation device. Background Art

[0002] The efficient and stable operation of a wide-range aircraft depends on efficient flow control. Especially in off-design conditions, applying effective flow control technology is the key to achieving a stable transition in wide-range flight and is recognized as one of the key technologies in the development of wide-range aircraft. Plasma excitation, as an active flow control method, is becoming an effective means to improve flow separation, instability, shock wave drag, friction drag, boundary layer control, shock wave control, and shock wave boundary layer interference control of wide-range aircraft. Currently, the circuit device based on the pulsed plasma excitation active control method mainly relies on a capacitor to provide energy input. It is carried out in a single-capacitor, large-energy supply mode, and there is a mutual restriction relationship between the excitation frequency and energy. This leads to a stable control effect of plasma arc excitation only in the laminar transition under low Reynolds number conditions and in the interference between shock waves / laminar boundary layers. However, it is still difficult to meet the flow control requirements of wide-range aircraft under all working conditions, especially the shock wave turbulent boundary layer interference flow under high Reynolds number conditions. There is an urgent need for innovative technical solutions. Internationally, quite a lot of research on plasma excitation in the field of shock wave / boundary layer interference flow has been carried out, but most of them are limited to the research scope of low Reynolds number laminar interference or low turbulence interference. On the one hand, it is because the turbulent boundary layer under high Reynolds number conditions has a strong ability to resist disturbances. On the other hand, it is also because of the lack of effective large-energy, ultra-high-frequency control means. Most of the shock wave / turbulent boundary layer interference flows on the aircraft surface are high Reynolds number turbulent interferences, and there is no report on the control of related plasma excitation under high Reynolds number conditions. Secondly, the current pulsed arc plasma excitation still cannot meet the needs of practical applications and must be improved. The previous circuits mainly used single-capacitor energy storage, but the charging and discharging frequency of the capacitor could not keep up with the excitation frequency. Research shows that the time required for the capacitor to be fully charged again (95% is approximately considered to be the fully charged state) after a single discharge is in the millisecond order of magnitude. The disadvantage of this discharge circuit device is that the energy of a single pulsed discharge is limited by the charging and discharging frequency of the capacitor, resulting in its decrease as the excitation frequency increases. Relevant papers have made explanations [1-2], and it is difficult to produce a high-frequency, large-energy stable control effect under high Reynolds number conditions.

[0003] [1]Gan, T., & Wang, Q.. (2022). Manipulation of ramp-induced shock using an array of surface arc plasma actuators. International Journal of Heat and Fluid Flow, 93, 4, paragraph 2.

[0004] [2]Tian, G., Yun, W., Zhengzhong, S., Di, J., Huimin, S., & Min, J.. (2018). Shockwave boundary layer interaction controlled by surface arc plasma actuators. Physics of Fluids, 30(5), 055107 - 8, paragraph 2.

[0005] Currently, the discharge circuit devices used in traditional plasma actuators all adopt single - capacitor energy storage. At the same time, under the condition of supersonic incoming flow, the air pressure is very low and the breakdown voltage required is very high. Therefore, two power supplies are equipped in the circuit. One pulse power supply is responsible for breaking down the air and generating high - frequency pulse signals, and one DC power supply is responsible for continuously charging the capacitor and supplying it to the actuator to form local energy deposition. Wang, L., Xia, Z. X., Luo, Z. B., & Chen, J.. (2014). Three - electrode plasma synthetic jet actuator for high - speed flow control. Aiaa Journal, 52(4), 880Figure2. However, this circuit device cannot meet the compatibility of working frequency and discharge energy. In addition, although in the power supply design, the high - voltage pulse power supply also considers the design of parallel capacitors, its design purpose is only to increase the excitation frequency, but it does not perform timing control on the capacitor charge and discharge, and cannot achieve efficient excitation. Currently, there is no circuit design for arc actuators specifically for high - frequency, high - energy, and high - efficiency discharge.

[0006] In summary, at present, the discharge circuit device of the plasma actuator based on single - capacitor parallel connection still has prominent problems in supersonic flow control, such as the incompatibility between excitation frequency and discharge energy, and the low energy utilization rate of the power supply. Summary of the Invention

[0007] To overcome the problems existing in the prior art, the present invention discloses a device capable of generating high-frequency and high-energy plasma excitation. The basic idea is as follows: A signal generator and its control switch circuit are added to the capacitor bank. According to the excitation frequency signal of the pulse power supply, the signal generator is controlled to output a low level to complete the sequential discharge of the capacitors, so as to increase the excitation frequency without reducing the single-shot discharge energy. After using this device, the operating frequency of the exciter can be greatly increased while ensuring that the single-shot energy does not decay, so as to meet the control requirements of turbulent flow under supersonic / hypersonic and high Reynolds number conditions.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A multi-capacitor parallel pulse-type plasma excitation device includes: a high-voltage pulse power supply, a DC power supply, a signal generator, energy storage capacitors, electronic switches, diodes, protection resistors, an electrode matrix, an insulating plate, a circuit probe, and a signal amplifier. The positive pole of the DC power supply is connected to the protection resistor. After passing through the protection resistor, one path passes through the electronic switch and the energy storage capacitor and then is connected to the negative pole of the DC power supply, and the other path is connected to the positive pole of the diode. After passing through the negative pole of the diode, it is divided into two paths. One path passes through the next-level electronic switch and the energy storage capacitor and then is connected to the negative pole of the DC power supply, and the other path is connected to the positive pole of the next-level diode. After passing through the negative pole of the next-level diode, it is divided into two paths again. This is repeated n times. After passing through the last diode, it is divided into two paths. One path is connected to the positive pole of the high-voltage pulse power supply, passes through the negative pole of the high-voltage pulse power supply and is connected to the negative pole of the DC power supply, and the other path is connected to one end of the electrode matrix and the input end of the circuit probe. The other end of the electrode matrix is grounded, the grounding end of the circuit probe is grounded, and the output end of the circuit probe is connected to the input end of the signal amplifier. The signal generator outputs n control signals to the electronic switches.

[0010] Furthermore, there are n energy storage capacitors; there are n electronic switches, and triodes, MOS tubes or IGBTs can be selected. As long as the model with a control frequency above 50 kHz can meet the requirements; the insulating plate is made of organic plastic or boron nitride ceramic, with internal openings, and the aperture size matches the electrode diameter; the number of electrodes in the electrode matrix is comprehensively considered according to the supersonic oncoming flow conditions and the set voltage of the high-voltage pulse power supply. The electrodes are inserted into the electrode mounting holes on the insulating plate, and the upper ends are flush with the upper surface of the insulating plate. The circuit probe is a current sensor or a voltage sensor; the electrode matrix is installed on the openings of the insulating plate, and the electrodes are made of tungsten electrodes or copper electrodes resistant to arc ablation.

[0011] Further, the anode of the electrode in the first row and first column of the electrode matrix is connected to the output terminal of the last diode through the lower surface of the insulating plate. The cathode of the electrode in the first row and first column and the anode of the electrode in the second row and first column are connected by a wire on the lower surface of the insulating plate. And so on, the cathode of the electrode in the y-th row and first column is grounded and connected to the negative pole of the power supply by a wire on the lower surface of the insulating plate. Similarly, the anode of the electrode in the first row and second column is connected to the output terminal of the last diode through the lower surface of the insulating plate. The cathode of the electrode in the first row and second column and the anode of the electrode in the second row and second column are connected by a wire on the lower surface of the plate. And so on to the x-th column.

[0012] Further, there are 24 energy storage capacitors and 24 electronic switches.

[0013] Further, the electrode matrix has 4 columns and 4 rows. The distance between the anode and cathode of the electrode is 4 mm, and the column pitch is 10 mm. It is composed of 32 electrodes.

[0014] Further, the insulating plate is made of organic plastic PMMA (polymethyl methacrylate), with a pore diameter of 4 mm and a thickness of 20 mm. The circuit probe is a voltage sensor Tektronix P6015A high-voltage probe.

[0015] Further, the overall volume of the device is 0.5 cubic meters, and the weight is 40 kg. The high-voltage pulse power supply is a microsecond pulse power supply, model: KGD-NSPS3U30F2, voltage: 0 - 30 kV, pulse frequency: 0 - 2 kHz, rising edge 1 μs, pulse width 2 μs, volume: length×width×height 100 mm×120 mm×40 mm, weight 15 kg; the DC power supply is a high-voltage DC power supply, voltage: 0 - 3 kV, maximum power: 3 kW, output voltage 3 kV, volume 130 mm×120 mm×60 mm; the energy storage capacitor has a withstand voltage of 5 kV and a capacitance value of 2 μF; the protection resistor has a withstand voltage of 5 kV and a resistance value of 1000 Ω; the electronic switch is an IGBT, model M10GD120DLC; the signal generator model is Stanford DG535, outputting 24 channels of signals; the upper electrode of the electrode matrix uses tungsten electrodes; the signal amplifier is a Tektronix TCPA300 amplifier.

[0016] The present invention also provides a multi-capacitor parallel pulse type plasma excitation method, using the above device, including:

[0017] Step 1: Charge the energy storage capacitor, that is, the signal generator sends out a high level, turns on the electronic switch, and the DC power supply charges the energy storage capacitor simultaneously through the protection resistor.

[0018] Step 2: Discharge of the first - stage capacitor. That is, after the energy - storage capacitor is fully charged, the signal generator emits a low - level signal to turn off the electronic switch. The high - voltage pulse power supply provides a high - voltage pulse to break down the air between the electrode matrices, forming an arc discharge. Under the excitation of the high - voltage pulse power supply, an arc discharge occurs between the cathode and anode of the electrodes between the electrode matrices, generating an electron - flow channel. At the same time, the high - voltage pulse power supply transmits the excitation frequency to the signal generator in the form of a signal. The signal generator then transmits a high - level signal to the first - stage electronic switch to turn it on. The first - stage energy - storage capacitor instantaneously releases electrical energy to the electrode matrix, completing the power injection of one discharge. At the same time, with the first - stage electronic switch in the on state, the DC power supply continuously charges the energy - storage capacitor until it is fully charged and then turns off the first - stage electronic switch;

[0019] Step 3: Discharge of the second - stage capacitor. That is, the signal generator transmits a high - level signal to the second - stage electronic switch according to the excitation frequency of the high - voltage pulse power supply to turn it on. The second - stage energy - storage capacitor releases energy to the electrode matrix. The first - stage diode is used to prevent the current released by the second - stage energy - storage capacitor from flowing back. The DC power supply continuously charges the second - stage energy - storage capacitor until the second - stage energy - storage capacitor is fully charged and then turns off the second - stage electronic switch;

[0020] Steps 4 - Step n: The same as Step 2 or Step 3;

[0021] Step n + 1: Discharge of the n - th stage capacitor. That is, at this time, the previous energy - storage capacitors are already fully charged, so it enters Step 1, the discharge of the first - stage capacitor again, forming a cycle.

[0022] Furthermore, the frequency of the high - and low - level signals output by the signal generator matches the pulse frequency of the high - voltage pulse power supply.

[0023] Furthermore, n is 24.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. Compared with the traditional arc - excitation generation circuit, this device can generate high - frequency and high - energy arc excitation without reducing the single - pulse excitation energy. At the same time, it can also regulate the excitation intensity, excitation frequency, discharge power, and working time, and has the advantages of fast response, low power consumption, and high energy utilization rate.

[0026] 2. The structure is relatively simple. The power - supply circuit only adds capacitors and electronic switches, with a small overall volume, easy to install and disassemble, etc. It is a high - frequency, high - energy, and fast - response plasma - excitation generation device.

[0027] 3. It is not limited by the discharge frequency, has stronger control ability, and can control the energy input more flexibly, greatly expanding the application range of the plasma exciter in the field of wide - area aircraft flow control technology. Description of the Drawings

[0028] Figure 1 This is the schematic diagram of the hardware composition of the present invention;

[0029] Figure 2 This is the structure diagram of the electrode matrix and the insulating plate in the present invention;

[0030] Figure 3 This is the diagram of the capacitor charging process in the present invention;

[0031] Figure 4 This is the diagram of the action of the first pulse signal in the present invention;

[0032] Figure 5 This is the diagram of the action of the second pulse signal in the present invention;

[0033] Figure 6 This is the diagram of the action of the third pulse signal in the present invention;

[0034] Description of the reference numerals: 1. High-voltage pulse power supply, 2. DC power supply, 3. Signal generator, 41 - 4n. Energy storage capacitors, 51 - 5n. Electronic switches, 61 - 6n. Diodes, 7. Protection resistor, 81 - 8m. Electrode matrix, 9. Insulating plate, 10. Circuit probe, 11. Signal amplifier. Detailed Description of the Invention

[0035] To make the objectives, technical means and advantages of the present invention clearer, the content of the present invention will be further described in detail below with reference to the drawings and embodiments.

[0036] As Figure 1As shown in the figure, a multi-capacitor parallel pulse plasma excitation device includes: a high-voltage pulse power supply 1, a DC power supply 2, a signal generator 3, energy storage capacitors 41-4n, electronic switches 51-5n, diodes 61-6n, a protection resistor 7, an electrode matrix 81-8m, an insulating plate 9, a circuit probe 10, and a signal amplifier 11. The positive pole of the DC power supply 2 is connected to the protection resistor 7. After passing through the protection resistor 7, one path passes through the electronic switch 51 and the energy storage capacitor 41 and then is connected to the negative pole of the DC power supply 2. One path is connected to the positive pole of the diode 61. After passing through the negative pole of the diode 61, it is divided into two paths. One path passes through the next-level electronic switch 52 and the energy storage capacitor 42 and then is connected to the negative pole of the DC power supply. The other path is connected to the positive pole of the next-level diode 62. After passing through the negative pole of the next-level diode 62, it is divided into two paths. This is repeated n times. After passing through the last diode 6n, it is divided into two paths. One path is connected to the positive pole of the high-voltage pulse power supply 1, passes through the negative pole of the high-voltage pulse power supply 1 and is connected to the negative pole of the DC power supply 2. The other path is connected to one end of the electrode matrix 81-8m and the input end of the circuit probe 10. The other end of the electrode matrix 81-8m is grounded. The grounded end of the circuit probe 10 is grounded. The output end of the circuit probe 10 is connected to the input end of the signal amplifier 11. The signal generator 11 outputs n control signals to the electronic switches 51-5n. The overall volume of the device is 0.5 cubic meters, and the weight is 40 kg.

[0037] The high-voltage pulse power supply 1 is a self-developed microsecond pulse power supply, model: KGD-NSPS3U30F2, voltage: 0-30 kV, pulse frequency: 0-2 kHz, rising edge 1 μs, pulse width 2 μs, volume: length×width×height 100 mm×120 mm×40 mm, weight 15 kg;

[0038] The DC power supply 2 selects a high-voltage DC power supply from Xi'an Furunde Company, voltage: 0-3 kV, maximum power: 3 kW, output voltage 3 kV, volume 130 mm×120 mm×60 mm;

[0039] There are n energy storage capacitors 41-4n, with a withstand voltage of 5 kV and a capacitance value of 2 μF;

[0040] The protection resistor 7 has a withstand voltage of 5 kV and a resistance value of 1000 Ω;

[0041] There are n electronic switches 51-5n, which can select triodes, MOS tubes or IGBTs. As long as the model with a control frequency above 50 kHz can meet the requirements. In this embodiment, IGBTs are selected, model: M10GD120DLC;

[0042] The signal generator 11 is model Stanford DG535, outputting 24 signals. A commercially available signal generator can also be used;

[0043] The electrode matrix 81-8m is installed on the openings of the insulating flat plate 9. The electrodes are made of tungsten electrodes or copper electrodes that are resistant to arc ablation. If used for a long time, the tungsten electrodes have better performance, and tungsten electrodes are selected in this embodiment;

[0044] The insulating flat plate 9 is made of an organic plastic or boron nitride ceramic with good insulation performance and machinability. It has internal openings, and the aperture size matches the diameter of the electrodes; the hole layout can be along the span direction or along the flow direction, and the openings are specifically made according to the needs of supersonic flow control. In a specific embodiment of the present invention, an organic plastic PMMA (polymethyl methacrylate), also known as acrylic or plexiglass, is selected, with an aperture of 4 mm and a thickness of 20 mm.

[0045] The number of electrodes in the electrode matrix 81-8m is comprehensively considered according to the supersonic oncoming flow conditions and the set voltage of the high-voltage pulse power supply. The electrodes are inserted into the electrode mounting holes on the insulating flat plate 9, and the upper ends are flush with the upper surface of the insulating flat plate 9. The anode of the electrode in the first row and the first column is connected to the output end of the last diode 6n through the lower surface of the insulating flat plate 9. The cathode of the electrode in the first row and the first column and the anode of the electrode in the second row and the first column are connected by a wire on the lower surface of the insulating flat plate 9, and so on. The cathode of the electrode in the y-th row and the first column is grounded by a wire on the lower surface of the insulating flat plate 9 and connected to the negative pole of the power supply; similarly, the anode of the electrode in the first row and the second column is connected to the output end of the last diode 6n through the lower surface of the insulating flat plate 9. The cathode of the electrode in the first row and the second column and the anode of the electrode in the second row and the second column are connected by a wire on the lower surface of the insulating flat plate 9, and so on to the x-th column. In a specific embodiment of the present invention, as Figure 2 shown, the electrode matrix 81-8m has 4 columns and 4 rows, the distance between the anode and the cathode of the electrode is 4 mm, the column spacing is 10 mm, and it is composed of 32 electrodes.

[0046] The circuit probe 10 is a current sensor or a voltage sensor. The voltage sensor is more accurate, and the voltage sensor Tektronix P6015A high-voltage probe is selected in this embodiment;

[0047] The signal amplifier 11 is a Tektronix TCPA300 amplifier;

[0048] When the present invention works, it is first charged. As Figure 3 shown, the signal generator 3 sends out a high level, turns on the electronic switches 51-5n, and the DC power supply 2 charges the energy storage capacitors 41-4n simultaneously through the protection resistor 7; a potential difference is formed between the electrode matrix 81-8m, but this potential difference is not sufficient to break down the air between the electrode matrix 81-8m to form an arc;

[0049] Then it is the first-stage capacitor discharge. As Figure 4As shown, after the energy storage capacitors 41 - 4n are fully charged, the signal generator 3 emits a low level to turn off the electronic switches 51 - 5n. The high - voltage pulse power supply 1 provides high - voltage pulses to break down the air between the electrode matrices 81 - 8m, forming an arc discharge. Under the excitation of the high - voltage pulse power supply 1, an arc discharge occurs between the cathode and anode of the electrodes between the electrode matrices 81 - 8m, generating an electron - flow channel. At the same time, the high - voltage pulse power supply 1 transmits the excitation frequency to the signal generator 3 in the form of a signal. The signal generator 3 then transmits a high - level signal to the first - stage electronic switch 51, turning it on. The first - stage energy storage capacitor 41 instantaneously releases electrical energy to the electrode matrices 81 - 8m, completing the power injection of one discharge. At the same time, with the first - stage electronic switch 51 in the on state, the DC power supply 2 continuously charges the first - stage energy storage capacitor 41 until it is fully charged and then turns off the first - stage electronic switch 51;

[0050] Next is the discharge of the second - stage capacitor, as Figure 5 shown. The signal generator 3, according to the excitation frequency of the high - voltage pulse power supply 1, transmits a high - level signal to the second - stage electronic switch 52, turning it on. The second - stage energy storage capacitor 42 releases energy to the electrode matrices 81 - 8m. The first - stage diode 61 is used to prevent the current released by the second - stage energy storage capacitor 42 from flowing back; the DC power supply 2 continuously charges the second - stage energy storage capacitor 42 until the second - stage energy storage capacitor 42 is fully charged and then turns off the second - stage electronic switch 52;

[0051] Next is the discharge of the third - stage capacitor, as Figure 6 shown. The principle is the same as that of the first - stage and the second - stage;

[0052] Finally, it comes to the discharge of the n - th stage capacitor. At this time, the first - stage energy storage capacitor 41 in front has already been fully charged, so it enters the first - stage capacitor discharge as shown in Figure 4 and forms a cycle;

[0053] The frequency of the high - and low - level signals output by the signal generator 3 matches the pulse frequency of the high - voltage pulse power supply 1, achieving the purpose of high - frequency discharge. The exciter 8 can receive the energy released by the energy storage capacitor each time, achieving the purpose of high - energy discharge; as long as the number of energy storage capacitors 41 - 4n connected in parallel is large enough, no matter how high the excitation frequency of the high - voltage pulse power supply 1 is, it will not affect the discharge power and energy of each discharge.

[0054] The present invention has the following beneficial effects:

[0055] 1. Compared with the traditional arc - excitation generation circuit, this device can generate high - frequency and high - energy arc excitation without reducing the single - pulse excitation energy. At the same time, it can also regulate the excitation intensity, excitation frequency, discharge power, and working time, and has fast response, low power consumption, and high energy utilization rate.

[0056] 2. It has a relatively simple structure. The power supply circuit only adds capacitors and electronic switches, with the overall volume being small, easy to install and disassemble, etc. It is a plasma excitation generation device with high frequency, high energy and fast response.

[0057] 3. Plasma excitation is not restricted by the discharge frequency, has stronger control ability, and the control of energy input is more flexible, greatly expanding the application scope of plasma actuators in the field of wide-domain aircraft flow control technology.

Claims

1. A multi-capacitor parallel pulsed plasma excitation device, comprising: A high voltage pulse power supply (1), a direct current power supply (2), a signal generator (3), an energy storage capacitor (41-4n), an electronic switch (51-5n), a diode (61-6n), a protective resistor (7), an electrode matrix (81-8m), an insulating plate (9), a circuit probe (10) and a signal amplifier (11), characterized in that: the positive electrode of the direct current power supply (2) is connected to the protective resistor (7), after passing through the protective resistor (7), one path passes through the first-stage electronic switch (51) and the first-stage energy storage capacitor (41) and then connects to the negative electrode of the direct current power supply (2), one path is connected to the positive electrode of the first-stage diode (61), and is further divided into two paths through the negative electrode of the first-stage diode (61), one path passes through the next-stage electronic switch (52) and the energy storage capacitor (41). After the capacitor (42), the negative electrode of the DC power supply (2) is connected, and the other path is connected to the positive electrode of the next-stage diode (62), and is further divided into two paths through the negative electrode of the next-stage diode (62). This is repeated for n paths. After passing through the last diode (6n), it is divided into two paths. One path is connected to the positive electrode of the high-voltage pulse power supply (1), and is connected to the negative electrode of the DC power supply (2) through the negative electrode of the high-voltage pulse power supply (1). The other path is connected to one end of the electrode matrix (81-8m) and the input end of the circuit probe (10), and is grounded at the other end through the electrode matrix (81-8m). The grounding end of the circuit probe (10) is grounded, and the output end of the circuit probe (10) is connected to the input end of the signal amplifier (11). The signal generator (11) outputs n control signals to the electronic switch (51-5n).

2. A multi-capacitor parallel pulsed plasma excitation device as claimed in claim 1, characterized in that: There are n energy storage capacitors (41-4n); there are n electronic switches (51-5n), which can be triodes, MOS tubes or IGBTs, and any model with a control frequency of more than 50kHz can meet the requirements; the insulating plate (9) is made of organic plastic or boron nitride ceramics, with holes opened inside, and the hole diameter matches the electrode diameter; the number of electrodes in the electrode matrix (81-8m) is comprehensively considered based on the supersonic flow conditions and the set voltage of the high-voltage pulse power supply, the electrodes are inserted into the electrode mounting holes on the insulating plate (9), and the upper ends are kept flush with the upper surface of the insulating plate (9), and the circuit probe (10) is a current sensor or a voltage sensor; the electrode matrix (81-8m) is installed on the opening of the insulating plate (9), and the electrodes are tungsten electrodes or copper electrodes resistant to arc ablation.

3. A multi-capacitor parallel pulsed plasma excitation device as claimed in claim 3, characterized in that: The anode of the electrode in the first row and first column of the electrode matrix (81-8m) is connected to the output end of the last diode through the lower surface of the insulating plate (9), the cathode of the electrode in the first row and first column and the anode of the electrode in the second row and first column are connected by a wire on the lower surface of the insulating plate (9), and by analogy, the cathode of the electrode in the first row and first column is grounded by a wire on the lower surface of the insulating plate (9) and connected to the negative electrode of the power supply; similarly, the anode of the electrode in the first row and second column is connected to the output end of the last diode through the lower surface of the insulating plate (9), the cathode of the electrode in the first row and second column and the anode of the electrode in the second row and second column are connected by a wire on the lower surface of the plate, and by analogy to the xth column.

4. A multi-capacitor parallel pulsed plasma excitation device as claimed in claim 2, characterized in that: There are 24 energy storage capacitors (41-4n) and 24 electronic switches (51-5n).

5. A multi-capacitor parallel pulsed plasma excitation device as claimed in claim 3, characterized in that: The electrode matrix (81-8m) has 4 columns and 4 rows, the distance between the anode and cathode electrodes is 4 mm, the distance between the columns is 10 mm, and it consists of 32 electrodes.

6. A multi-capacitor parallel pulsed plasma excitation device as claimed in claim 5, characterized in that: The insulating plate (9) is made of organic plastic PMMA polymethyl methacrylate, with a hole diameter of 4 mm and a thickness of 20 mm; the circuit probe (10) is a voltage sensor Tektronix P6015A high-voltage probe.

7. A multi-capacitor parallel pulsed plasma excitation device as claimed in claim 6, characterized in that: The overall volume of the device is 0.5 cubic meters and the weight is 40 kg. The high-voltage pulse power supply (1) is a microsecond pulse power supply, model: KGD-NSPS3U30F2, voltage: 0-30 kV, pulse frequency: 0-2 kHz, rising edge 1 μs, pulse width 2 μs, volume: length, width and height 100 mm*120 mm*40 mm, weight 15 kg; the DC power supply (2) uses a high-voltage DC power supply, voltage: 0-3 kV, maximum power: 3 kW, output voltage 3 KV, volume 130 mm*120 mm*60 mm; the energy storage capacitor (41-4n) withstands a voltage of 5 KV and a capacitance of 2 μF; the protection resistor (7) withstands a voltage of 5 KV and a resistance of 1000 Ω; the electronic switch (51-5n) uses an IGBT, model M10GD120DLC; the signal generator (3) model is Stanford DG535, outputs 24 channels of signals; the electrodes on the electrode matrix (81-8m) are tungsten electrodes; the signal amplifier (11) is a Tektronix TCPA300 amplifier.

8. A multi-capacitor parallel pulsed plasma excitation method, using the above device: comprising: Step 1: charging the energy storage capacitor, that is, the signal generator (3) sends a high level, turns on the electronic switch (51-5n), and the DC power supply (2) charges the energy storage capacitor (41-4n) simultaneously after passing through the protection resistor (7); Step 2: After the first-stage capacitor is discharged, that is, the energy storage capacitor (41-4n) is charged, the signal generator (3) emits a low level, closes the electronic switch (51-5n), and the high-voltage pulse power supply (1) provides a high-voltage pulse to break through the air between the electrode matrix (81-8m) to form an arc discharge. Under the excitation of the high-voltage pulse power supply (1), arc discharge occurs between the electrode cathode and the anode between the electrode matrix (81-8m), generating an electron flow channel; at the same time, the high-voltage pulse power supply (1) transmits the excitation frequency to the signal generator (3) in the form of a signal, and the signal generator (3) then transmits a high-level signal to the first-stage electronic switch (51), turning it on. The first-stage energy storage capacitor (41) instantly releases electric energy to the electrode matrix (81-8m), completing the power injection of a discharge. At the same time, the electronic switch (51) is in the on state, and the DC power supply (2) continues to charge the energy storage capacitor (41) until the electronic switch (51) is turned off after it is fully charged; Step 3: The second-stage capacitor discharges, i.e., the signal generator (3) transmits a high-level signal to the second-stage electronic switch (52) according to the excitation frequency of the high-voltage pulse power supply (1), so that the second-stage energy storage capacitor (42) releases energy to the electrode matrix (81-8m), and the first-stage diode (61) is used to prevent the current released by the second-stage energy storage capacitor (42) from flowing back; the DC power supply (2) continuously charges the second-stage energy storage capacitor (42) until the second-stage energy storage capacitor (42) is fully charged and then the electronic switch (52) is turned off; Step 4-Step n: Same as Step 2 or Step 3; Step n+1: the nth capacitor discharges, that is, at this time, the previous energy storage capacitor (41) has already been fully charged, so the first capacitor of step 1 is discharged again, forming a cycle.

9. A multi-capacitor parallel pulsed plasma excitation method as claimed in claim 8, characterized in that: The frequencies of the high and low level signals output by the signal generator (3) match the pulse frequency of the high voltage pulse power supply (1).

10. A multi-capacitor parallel pulsed plasma excitation method as claimed in claim 9, characterized in that: n is 24.

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