Fuel oil atomization ignition head structure based on plasma excitation

Abstract

The invention discloses a fuel oil atomization ignition head structure based on plasma excitation, and relates to the technical field of aero-engine combustion chambers, the fuel oil atomization ignition head structure comprises a main oil pipe which is provided with a main oil way, and a plurality of main oil way spray holes are formed in the main oil pipe; the auxiliary oil pipe is provided with an auxiliary oil way, a plurality of auxiliary oil way spraying holes are formed in the auxiliary oil pipe, and the auxiliary oil pipe serves as a grounding electrode; a main oil pipe and an auxiliary oil pipe are arranged in the shell, the auxiliary oil pipe is located on the periphery of the main oil pipe, and a head airflow channel is formed between the main oil pipe and the auxiliary oil pipe; the gliding arc discharge electrode is mounted in the main oil pipe, and a gliding arc discharge area is formed between the gliding arc discharge electrode and the grounding electrode; the dielectric barrier discharge electrode is mounted on the outer wall of the main oil pipe, and a dielectric barrier discharge area is formed between the dielectric barrier discharge electrode and the grounding electrode; and the insulating layer is attached to the outer wall of the dielectric barrier discharge electrode and separates the dielectric barrier discharge electrode from the grounding electrode. The mode that dielectric barrier discharge, sliding arc discharge and pneumatic auxiliary atomization act at the same time is adopted, and the purpose of effectively improving the atomization effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine combustion chambers, and in particular to a head structure for fuel atomization ignition based on plasma excitation. Background Art

[0002] The fuel nozzle is a key component of an aircraft engine, responsible for atomizing or vaporizing the fuel and accelerating the formation of the mixed gas, thereby ensuring stable combustion and improving combustion efficiency. Common types of fuel nozzles in aircraft engines include centrifugal nozzles, pneumatic nozzles, and evaporative nozzles, also known as evaporation tubes.

[0003] The above mechanical nozzles have their own advantages and have been widely used in aircraft engines. Centrifugal nozzles have good mechanical reliability; pneumatic nozzles can fully and evenly mix the fuel and airflow, while the fuel supply pressure is low and the outlet temperature field is less sensitive to fuel changes; evaporative nozzles have a simple fuel supply method, light weight and low cost. However, these nozzles also have some shortcomings. The atomization effect of centrifugal nozzles is poor under low load conditions, and the adjustable range of fuel flow is limited; the lean flameout boundary of pneumatic nozzles is narrow; and the evaporative parts of evaporative nozzles are easily damaged by heat and are more sensitive to the type of fuel.

[0004] With the continuous update and iteration of aircraft engines, the combustion performance requirements of the combustion chamber are also increasing. Due to their own problems, the above nozzle structures have been unable to meet some new combustion chamber performance indicators. At this time, plasma technology, as a technical means of auxiliary combustion, has pointed out a new direction for the further development of aircraft engine nozzles.

[0005] However, the existing plasma combustion chamber head structure still has some problems, such as limited contact range between plasma and fuel, difficulty in ignition, and a small number of active particles generated by plasma, resulting in poor stimulation effect on combustion.

[0006] In the prior art, the application number is CN202310837647.9, and the name is a Chinese invention patent application for a tower-type coaxial staged combustion chamber head. It has a multi-stage swirler and multiple fuel supply paths, which has a better atomization effect, can reduce pollutant emissions, and improve the uniformity of outlet temperature distribution. However, this design requires physical means to improve the atomization effect, so the improvement of atomization performance and ignition performance are both limited. The application number is CN202210197068.8, and the name is a Chinese invention patent application for a DBD plasma combustion chamber head nozzle with a truncated cone structure. The use of an evaporation tube nozzle is conducive to enhancing the combustion of large molecular gas fuels, but it is difficult to achieve the defect of plasma excitation and enhanced atomization of liquid fuels. The application number is CN202310426844.1, and the name is a Chinese invention patent application for a variable sliding arc plasma center staged combustion chamber head. It can realize the function of single duty class discharge, main combustion class and duty class discharge at the same time, and has the advantages of simple structure, high reliability and low consumption. It can also carry out parametric research by installing cyclones of different angles and different rotation directions, avoiding various defects caused by the integrated processing of multiple sets of cyclone model test pieces, which can greatly shorten the processing cycle and save economic costs. However, the generated plasma is not easy to contact with the fuel and this head structure does not have the ignition function. Summary of the invention

[0007] The purpose of the present invention is to provide a head structure for fuel atomization ignition based on plasma excitation, to improve the atomization effect of the fuel to realize the plasma ignition function at the head position of the combustion chamber, and at the same time to implement plasma excitation on the combustion process in the combustion chamber to enhance the combustion effect.

[0008] To achieve the above-mentioned purpose, the technical solution of the present application is: a head structure for fuel atomization ignition based on plasma excitation, comprising:

[0009] A main oil pipe has a main oil path, and a plurality of main oil path spray holes are provided on the main oil pipe;

[0010] An auxiliary oil pipe has an auxiliary oil passage, and a plurality of auxiliary oil passage spray holes are opened on the auxiliary oil pipe, and the auxiliary oil pipe serves as a ground electrode;

[0011] The outer shell has a main oil pipe and a secondary oil pipe inside, wherein the secondary oil pipe is located outside the main oil pipe, and a head airflow channel is formed between the two;

[0012] The sliding arc discharge electrode is installed in the main oil pipe to form a sliding arc discharge area with the grounding electrode;

[0013] The dielectric barrier discharge electrode is installed on the outer wall of the main oil pipe to form a dielectric barrier discharge area between the electrode and the ground electrode;

[0014] The insulating layer is attached to the outer wall of the dielectric barrier discharge electrode to separate it from the ground electrode.

[0015] As a preferred solution of the present invention, a swirler is provided between the main oil pipe and the auxiliary oil pipe for generating a swirling airflow.

[0016] As a preferred solution of the present invention, the main oil circuit spray holes and the auxiliary oil circuit spray holes are evenly distributed in the circumferential direction and are cross-arranged.

[0017] As a preferred solution of the present invention, an end cover is provided on one side of the shell, and an insulating pad is provided between the end cover and the shell, the auxiliary oil pipe and the main oil pipe.

[0018] As a preferred solution of the present invention, the end of the auxiliary oil pipe has a gradually expanding fuel outlet.

[0019] As a preferred embodiment of the present invention, air enters the head air flow channel from the air inlet and flows through the cyclone to generate a rotating airflow. When the rotating airflow passes through the dielectric barrier discharge area, it is affected by the electric field to generate a dielectric barrier discharge plasma which is ejected out of the dielectric barrier discharge area together with the rotating airflow.

[0020] As a preferred embodiment of the present invention, the fuel enters the main oil circuit from the main oil circuit pipeline inlet and is then sprayed out from the main oil circuit spray hole at the end of the main oil circuit; the fuel also enters the auxiliary oil circuit from the auxiliary oil circuit pipeline inlet and is then sprayed out from the auxiliary oil circuit spray hole at the end of the auxiliary oil circuit.

[0021] As a preferred embodiment of the present invention, when the fuel is sprayed out from the main oil circuit spray holes and the auxiliary oil circuit spray holes, it is affected by the rotating airflow with dielectric barrier discharge plasma from the dielectric barrier discharge area, so that the fuel is quickly atomized into small droplets to form a fuel liquid mist; after the rotating airflow and the fuel liquid mist are mixed, they flow together to the fuel outlet, at which time the sliding arc power supply starts to work, and a sliding arc is generated in the sliding arc discharge area between the sliding arc discharge electrode and the grounding electrode, and the sliding arc excitation plasma has an exciting atomization effect on the fuel mixture, and can also achieve the purpose of ignition.

[0022] As a preferred embodiment of the present invention, the dielectric barrier discharge plasma is generated by the dielectric barrier discharge electrode and the ground electrode: when air flows through the dielectric barrier discharge area, the dielectric barrier discharge power supply starts to work, and the air is ionized under the action of the electric field to generate dielectric barrier discharge plasma.

[0023] As a preferred embodiment of the present invention, the sliding arc excitation plasma is generated by a sliding arc discharge electrode and a grounding electrode: when the airflow flows through the sliding arc discharge region between the sliding arc discharge electrode and the grounding electrode, the sliding arc discharge power supply is turned on to generate a sliding arc, and the sliding arc is affected by the airflow and slides along the airflow direction while continuously developing; in the area near the sliding arc, part of the unionized air is ionized by the sliding arc to generate sliding arc excitation plasma, and the sliding arc excitation plasma contains a large number of sliding arc active particles.

[0024] The present invention adopts the above technical solution, and can achieve the following technical effects:

[0025] (1) The design of the main and auxiliary oil circuits ensures that the plasma can immediately contact the oil mist after it is generated. The pneumatically atomized fuel directly passes through the sliding arc discharge area, allowing the oil mist and plasma to fully contact each other, thereby ensuring the atomization effect of the plasma on the fuel and the stability of the ignition.

[0026] (2) By setting up the dielectric barrier discharge area and the sliding arc discharge area, the decrease in the concentration of active particles before ignition is effectively delayed and the active particle action area is expanded. In this way, the active particles can better participate in the combustion reaction, thereby achieving the effect of supporting combustion.

[0027] (3) The dielectric barrier discharge structure and the sliding arc structure can generate a large number of active particles (such as OH active radicals, etc.) and free electrons. These particles and electrons move along the airflow direction and interact with the fuel spray, significantly improving the atomization characteristics of the fuel spray. At the same time, it can also expand the boundaries of ignition and flameout, enhance the stability of combustion, and realize the ignition function at the combustion head. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the head structure of fuel atomization ignition based on plasma excitation;

[0030] Figure 2 This is a working process diagram of the head structure based on plasma-excited fuel atomization ignition;

[0031] Figure 3 This is a circuit connection diagram of the head structure based on plasma-excited fuel atomization ignition;

[0032] Figure 4A three-dimensional diagram of the head structure based on plasma-excited fuel atomization ignition;

[0033] Explanation of serial numbers in the figure: 1 sliding arc discharge electrode, 2 dielectric barrier discharge electrode, 3 auxiliary oil pipe, 4 main oil pipe, 5 shell, 6 insulating layer, 7 cyclone, 8 insulating pad, 9 end cover, 10 head air flow channel, 11 air inlet, 12 dielectric barrier discharge area, 13 auxiliary oil circuit, 14 main oil circuit spray hole, 15 auxiliary oil circuit spray hole, 16 active particles, 17 fuel outlet, 18 sliding arc active particles, 19 sliding arc, 20 auxiliary oil circuit pipeline inlet, 21 main oil circuit, 22 main oil circuit pipeline inlet, 23 dielectric barrier discharge power supply, 24 sliding arc discharge power supply. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In view of the problems in the prior art that large particles of fuel are not easy to contact with plasma, resulting in poor plasma-enhanced fuel atomization effect and difficult ignition; and the number of active particles in the generated plasma is small, and as the active particles decrease rapidly during the flow process, the plasma excitation effect on the combustion process is not ideal. This embodiment provides a head structure for fuel atomization ignition based on plasma excitation, such as Figure 1 As shown, including:

[0040] The main oil pipe can be made of high temperature resistant insulating material and has a main oil circuit. A plurality of main oil circuit spray holes are provided on the main oil pipe.

[0041] The auxiliary oil pipe can be made of a high-temperature alloy material and has an auxiliary oil passage. A plurality of auxiliary oil passage spray holes are provided on the auxiliary oil pipe, and the auxiliary oil pipe serves as a ground electrode. The end of the auxiliary oil pipe has a gradually expanding fuel outlet.

[0042] The outer shell can be made of metal material, and is provided with a main oil pipe and a secondary oil pipe inside. The secondary oil pipe is located outside the main oil pipe, and a head air flow channel is formed between the two.

[0043] A sliding arc discharge electrode is installed in the main oil pipe to form a sliding arc discharge area with the grounding electrode; preferably, the sliding arc discharge electrode can be made of a high-temperature resistant alloy with good conductivity, including a connected electrode rod and an electrode cap, and the electrode cap is located at the end of the main oil pipe;

[0044] The dielectric barrier discharge electrode is preferably a sleeve structure, which can be made of copper material with good electrical conductivity, and is installed on the outer wall of the main oil pipe to form a dielectric barrier discharge area between the electrode and the ground electrode;

[0045] The insulating layer is made of insulating material and is attached to the outer wall of the dielectric barrier discharge electrode to separate it from the ground electrode;

[0046] A swirler, arranged between the main oil pipe and the auxiliary oil pipe, for generating a swirling airflow;

[0047] The end cover can be made of metal material and is arranged on one side of the shell. An insulating pad is arranged between the end cover and the shell, the auxiliary oil pipe and the main oil pipe to play the role of insulation and sealing.

[0048] like Figure 2 As shown, when air enters the head airflow channel 10 from the air inlet 11, it flows through the cyclone 7 to generate a high-speed rotating airflow; when the airflow passes through the dielectric barrier discharge area 12, the gas is affected by the electric field to generate a dielectric barrier discharge plasma, which is ejected from the dielectric barrier discharge area 12 together with the airflow; the fuel can enter the main oil circuit 21 from the main oil circuit pipeline inlet 22, and then be ejected from the main oil circuit spray hole 14 at the end of the main oil circuit 21; the fuel can also enter the auxiliary oil circuit 13 from the auxiliary oil circuit pipeline inlet 20, and then be ejected from the auxiliary oil circuit spray hole 15 at the end of the auxiliary oil circuit 13; wherein the main oil circuit spray hole 14 and the auxiliary oil circuit spray hole 15 are both circumferentially evenly distributed. The main oil circuit spray holes 14 and the auxiliary oil circuit spray holes 15 are arranged crosswise; when the fuel is sprayed from the main oil circuit spray holes 14 and the auxiliary oil circuit spray holes 15, the fuel is rapidly atomized into small droplets to form a fuel mist by the high-speed airflow with dielectric barrier discharge plasma from the plasma discharge area 12; after the swirling gas and the fuel mist are mixed, they flow together to the fuel outlet 17, at which time the sliding arc power supply 24 starts to work, and a sliding arc is generated in the sliding arc discharge area between the sliding arc discharge electrode 9 and the auxiliary oil pipe 3, which has an exciting atomization effect on the fuel mixture, and at the same time, the sliding arc has a high energy and can also achieve the purpose of ignition.

[0049] like Figure 3 As shown, the present invention achieves fuel atomization through pneumatic atomization and plasma excitation. Among them, plasma excitation includes two parts: dielectric barrier discharge plasma and sliding arc excitation plasma, and pneumatic atomization is mainly achieved through dual excitation of cyclone and transverse airflow.

[0050] The dielectric barrier discharge plasma is generated by the dielectric barrier discharge electrode and the auxiliary oil pipe 3, wherein the auxiliary oil pipe 3 serves as the ground electrode of the dielectric barrier discharge. When air flows through the dielectric barrier discharge area 12, the dielectric barrier discharge power supply 23 starts to work, and the air is ionized under the action of the electric field to generate the dielectric barrier discharge plasma. The dielectric barrier discharge plasma has the characteristics of low temperature and stable discharge, and can maintain continuous operation during the operation of the engine. Under the action of the airflow, the dielectric barrier discharge plasma carries a large number of active particles 16 (OH active radicals, etc.) and free electrons to move along the airflow direction, and then reacts with the fuel spray, so that the macromolecular hydrocarbon fuel is ionized into charged active particles, which will significantly improve the atomization characteristics of the fuel spray.

[0051] The sliding arc excitation plasma is generated by the sliding arc discharge electrode 1 and the auxiliary oil pipe 3, wherein the auxiliary oil pipe 3 serves as the ground electrode of the sliding arc discharge. When the airflow flows through the sliding arc discharge area between the sliding arc discharge electrode 1 and the auxiliary oil pipe 3, the sliding arc discharge power supply 24 is turned on, and a sliding arc 19 is generated between the sliding arc discharge electrode 1 and the auxiliary oil pipe 3. The sliding arc 19 is continuously developed while sliding along the airflow direction under the action of the airflow. In the area near the sliding arc 19, part of the unionized air is ionized by the sliding arc, generating a sliding arc excitation plasma, which contains a large number of sliding arc active particles 18. Compared with the traditional ignition nozzle, the sliding arc ignition has a higher ignition energy, and the sliding arc ignition area is larger, so the sliding arc ignition method has a higher ignition success rate.

[0052] There are active particles with high activity but short existence time in the sliding arc active particles 18, and the sliding arc 19 has a high temperature, so that the air-fuel mixture carrying the active particles 16 flowing from the dielectric barrier discharge area 12 is ignited. At the same time, the plasma with different characteristics generated by the dielectric barrier discharge and the sliding arc discharge can achieve the purpose of expanding the point, the flameout boundary and enhancing the combustion stability.

[0053] The working process of the head structure of the plasma-driven fuel atomization ignition of the present application includes the following steps:

[0054] S1: Air enters the head air flow channel from the air inlet 15 and flows through the cyclone 7 to generate high-speed rotating air flow;

[0055] S2: The dielectric barrier discharge power supply 23 starts to work, the air flowing through the dielectric barrier discharge area 12 is ionized, and the generated dielectric barrier discharge plasma is ejected out of the area together with the high-speed airflow;

[0056] S3: The fuel enters the main oil circuit from the main oil circuit pipeline inlet and is sprayed out through the main oil circuit spray hole; the fuel enters the auxiliary oil circuit from the auxiliary oil circuit pipeline inlet and is sprayed out through the auxiliary oil circuit spray hole. The fuel sprayed from the main and auxiliary oil circuit spray holes is rapidly atomized into small droplets to form fuel liquid mist under the dual effects of high-speed rotating airflow and dielectric barrier discharge plasma;

[0057] S4: The sliding arc discharge power supply 24 starts to be energized, and a sliding arc is generated between the sliding arc discharge electrode 9 and the auxiliary oil pipe 3. The fuel mist interacts with the high-energy electrons and active particles generated by the sliding arc plasma, and the fuel mist that has completed the preliminary atomization is further atomized; at the same time, the sliding arc contacts the fully atomized fuel to complete the ignition.

[0058] S5: After the ignition is successful, the sliding arc discharge power supply 24 stops supplying power, and only the fuel is supplied from the main oil pipeline inlet 22 to provide sufficient fuel for combustion.

[0059] The effect of this embodiment is that the dielectric barrier discharge, sliding arc discharge and the combustion chamber head are coupled. The fuel is successively subjected to the plasma generated by the dielectric barrier discharge structure and the sliding arc structure, which can not only ensure the sufficient interaction between the active particles in the plasma and the fuel, but also utilize the different characteristics of the dielectric barrier discharge plasma and the sliding arc plasma to ensure the atomization effect while improving the ignition performance and expanding the point and flameout boundary; through structural design, the combustion chamber head has the function of enhancing atomization and ignition, and there is no interference between the two functions, so that the sliding discharge and the dielectric barrier discharge can work at the same time (ignition state), and the dielectric barrier discharge can work alone (combustion-supporting state).

[0060] The purpose of effectively improving the atomization effect is achieved by using the method of dielectric barrier discharge, sliding arc discharge and pneumatic assisted atomization acting simultaneously. After the fuel is sprayed out of the nozzle, it is first affected by the lateral airflow and the plasma generated by the dielectric barrier at the same time, so that the plasma acts on the fuel droplets after being stimulated by the lateral airflow, solving the problem that the plasma generated by the dielectric barrier has a weak effect on the fuel liquid column; the dielectric barrier discharge and the sliding arc discharge are combined under the premise of non-interference, so that the active particles generated by the dielectric barrier discharge can immediately enter the sliding discharge area, reducing the loss of active particles during the transportation process; at the same time, when the active particles generated by the dielectric barrier discharge enter the sliding arc discharge area, the success rate of sliding arc ignition can be improved.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A head structure for fuel atomization ignition based on plasma excitation, characterized in that: include: A main oil pipe has a main oil path, and a plurality of main oil path spray holes are provided on the main oil pipe; An auxiliary oil pipe has an auxiliary oil passage, and a plurality of auxiliary oil passage spray holes are opened on the auxiliary oil pipe, and the auxiliary oil pipe serves as a ground electrode; The outer shell has a main oil pipe and a secondary oil pipe inside, wherein the secondary oil pipe is located outside the main oil pipe, and a head airflow channel is formed between the two; The sliding arc discharge electrode is installed in the main oil pipe to form a sliding arc discharge area with the grounding electrode; The dielectric barrier discharge electrode is installed on the outer wall of the main oil pipe to form a dielectric barrier discharge area between the electrode and the ground electrode; An insulating layer is attached to the outer wall of the dielectric barrier discharge electrode to separate it from the ground electrode; 2. According to claim 1, a head structure for fuel atomization ignition based on plasma excitation, characterized in that: A swirler is provided between the main oil pipe and the auxiliary oil pipe to generate a swirling airflow.

3. According to claim 1, a head structure for fuel atomization ignition based on plasma excitation, characterized in that: The main oil circuit spray holes and the auxiliary oil circuit spray holes are evenly distributed in the circumferential direction and are cross-arranged.

4. According to claim 1, a head structure for fuel atomization ignition based on plasma excitation is characterized in that: An end cover is arranged on one side of the shell, and an insulating pad is arranged between the end cover and the shell, the auxiliary oil pipe and the main oil pipe.

5. The head structure of fuel atomization ignition based on plasma excitation according to claim 1, characterized in that: The end of the auxiliary oil pipe is provided with a gradually expanding fuel outlet.

6. The head structure of fuel atomization ignition based on plasma excitation according to claim 2, characterized in that: Air enters the head air flow channel from the air inlet and flows through the cyclone to generate a rotating airflow. When the rotating airflow passes through the dielectric barrier discharge area, it is affected by the electric field to generate a dielectric barrier discharge plasma that is ejected from the dielectric barrier discharge area together with the rotating airflow.

7. The head structure of fuel atomization ignition based on plasma excitation according to claim 1, characterized in that: The fuel enters the main oil circuit from the main oil circuit pipeline inlet and is then sprayed out from the main oil circuit spray holes at the end of the main oil circuit; the fuel also enters the auxiliary oil circuit from the auxiliary oil circuit pipeline inlet and is then sprayed out from the auxiliary oil circuit spray holes at the end of the auxiliary oil circuit.

8. The head structure of fuel atomization ignition based on plasma excitation according to claim 7, characterized in that: When the fuel is sprayed out from the main oil circuit spray holes and the auxiliary oil circuit spray holes, it is affected by the rotating airflow with dielectric barrier discharge plasma from the dielectric barrier discharge area, so that the fuel is quickly atomized into small droplets to form fuel liquid mist; after the rotating airflow and the fuel liquid mist are mixed, they flow toward the fuel outlet together. At this time, the sliding arc power supply starts to work, and a sliding arc is generated in the sliding arc discharge area between the sliding arc discharge electrode and the grounding electrode. The sliding arc excitation plasma has an exciting atomization effect on the fuel mixture, and can also achieve the purpose of ignition.

9. The head structure of fuel atomization ignition based on plasma excitation according to claim 8, characterized in that: The dielectric barrier discharge plasma is generated by the dielectric barrier discharge electrode and the ground electrode: when air flows through the dielectric barrier discharge area, the dielectric barrier discharge power supply starts to work, and the air is ionized under the action of the electric field to generate dielectric barrier discharge plasma.

10. The head structure of fuel atomization ignition based on plasma excitation according to claim 8, characterized in that: The sliding arc excitation plasma is generated by the sliding arc discharge electrode and the grounding electrode: when the airflow flows through the sliding arc discharge area between the sliding arc discharge electrode and the grounding electrode, the sliding arc discharge power supply is turned on to generate a sliding arc, and the sliding arc is affected by the airflow and slides along the airflow direction while continuously developing; in the area near the sliding arc, part of the unionized air is ionized by the sliding arc to generate sliding arc excitation plasma, and the sliding arc excitation plasma contains a large number of sliding arc active particles.

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