A centrifugal nozzle coupled with a head structure of a sliding arc ignition combustion chamber of a collision spray

Abstract

The application discloses a centrifugal nozzle and collision spray coupled sliding arc ignition combustion chamber head structure and relates to the technical field of an aero-engine; the centrifugal nozzle comprises a primary swirling shell, a centrifugal fuel nozzle, a secondary swirling shell, a sliding arc insulation layer and a secondary swirling shell; the primary swirling shell is internally provided with a primary swirler and is connected to an external power supply as a high-voltage electrode; the centrifugal fuel nozzle is connected with a main oil circuit and is located in the cavity of the primary swirling shell; the secondary swirling shell is internally provided with a secondary swirler and is connected with the ground end of the power supply as a low-voltage electrode; and the sliding arc insulation layer is arranged between the primary swirling shell and the secondary swirling shell and separates the high-voltage electrode from the low-voltage electrode. The application significantly enhances the atomization effect of fuel, improves the ignition performance, fully utilizes the space of the combustion chamber and improves the combustion efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine, and particularly relates to a sliding arc ignition combustion chamber head structure coupled with a centrifugal nozzle and a collision spray. BACKGROUND

[0002] An aero-engine combustion chamber releases heat energy through chemical reaction of fuel and oxygen in air, thereby providing thrust for an aircraft. Among them, the fuel nozzle and the igniter as the core components of the combustion chamber head have a crucial influence on the performance of the combustion chamber. At present, the improvement of the combustion chamber head of the aero-engine mainly focuses on the following several directions: 1. Improvement of the fuel nozzle: through continuous optimization of the structure of the fuel nozzle, the spray field and the flow field in the combustion chamber can be improved, the fuel combustion can be more sufficient, and the combustion efficiency can be improved. But the centrifugal nozzle commonly used in the aero-engine is easily affected by the swirl at the fuel near the nozzle, forming a layer of liquid film, which hinders the atomization effect of the fuel. 2. Optimization of the igniter: through continuous improvement of the structure of the igniter, the ignition process can be rapid, reliable and smooth, thereby improving the overall reliability of the aero-engine. But the existing ignition mode has the problems of low ignition energy and large heat load, which will cause the service life of the igniter to be shortened. 3. Improvement of the head flow field: through the use of structures such as swirlers and Venturi tubes, the air flow field introduced into the combustion chamber head can be improved; optimizing the head flow field helps to reduce the flow loss of the fluid in the combustion chamber head, thereby improving the combustion efficiency of the aero-engine. But the flow field of the combustion chamber head is affected by many factors, and through the test method to find the combustion chamber structure with the best flow field not only has high cost, but also has long cycle.

[0003] The Chinese invention patent application with the application number CN202111076920.8 and the name of a combined dielectric barrier discharge plasma aero-engine combustion chamber head features that the dielectric barrier discharge in the flat plate type and the circular tube type is used to generate plasma and the fuel and the air entering the combustion chamber are contacted. The disadvantage is that it is difficult for the generated DBD plasma to contact the fuel from the secondary swirl, and the atomization effect of the fuel is poor. The Chinese invention patent application with the application number CN202111019264.8 and the name of an aero-engine combustion chamber head DBD plasma blade type axial swirler features that the DBD plasma is generated by using the swirler of the head, and the active particles with high concentration are generated in the airflow passage position of the swirler blade without affecting the original head of the aero-engine. The disadvantage is that when the DBD plasma is generated by using the swirler, the swirler blade is precise and small in size, and when the two sides of the swirler blade are used as the discharge electrode and the low-voltage electrode, the swirler blade is easily directly broken down, thereby causing the damage of the swirler. The Chinese invention patent application with the application number CN202011305935.2 and the name of a jet device, a combustion chamber head, a combustion chamber and an aero-engine features that the head is coupled with multiple pre-film atomizing nozzles and is divided into a pre-combustion stage, an intermediate stage and a main combustion stage. The disadvantage is that the structure is more complex than the traditional combustion chamber structure, and the weight is larger, thereby reducing the thrust-to-weight ratio of the aero-engine. SUMMARY

[0004] The purpose of the present application is to provide a centrifugal nozzle and collision spray coupled sliding arc ignition combustion chamber head structure, which uses the air introduced from the duct to form three-dimensional sliding arc ignition and enhances the effect of fuel atomization.

[0005] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: a centrifugal nozzle and collision spray coupled sliding arc ignition combustion chamber head structure, comprising:

[0006] A primary swirl shell is provided with a primary swirler, and the primary swirl shell is connected to an external power supply as a high-voltage electrode;

[0007] A centrifugal fuel nozzle is connected to a main oil circuit and located in the cavity of the primary swirl shell;

[0008] A secondary oil circuit fuel nozzle is connected to a secondary oil circuit and located in the wall of the primary swirl shell;

[0009] A secondary swirl shell is provided with a secondary swirler, and the secondary swirl shell is connected to the ground end of the power supply as a low-voltage electrode;

[0010] A sliding arc insulation layer is arranged between the primary swirl shell and the secondary swirl shell to separate the high-voltage electrode and the low-voltage electrode.

[0011] As a preferred scheme of the present application, the auxiliary oil path fuel nozzle is provided with a plurality of straight injection orifices, and the plurality of straight injection orifices share an annular oil path for oil supply.

[0012] As a preferred scheme of the present application, the primary swirl flow generator is located between the inner wall of the primary swirl flow shell and the outer wall of the centrifugal fuel nozzle, so that the air flowing through the inlet of the primary swirl flow generator is caused to generate swirl flow.

[0013] As a preferred scheme of the present application, the secondary swirl flow generator is located between the outer wall of the primary swirl flow shell and the inner wall of the secondary swirl flow shell, so that the air flowing through the inlet of the secondary swirl flow generator is caused to generate swirl flow, and a three-dimensional sliding arc is formed between the high-voltage electrode and the low-voltage electrode.

[0014] As a preferred scheme of the present application, the end of the primary swirl flow shell is provided with a fixed platform, and a sealing gasket is located between the primary swirl flow shell and the fixed platform.

[0015] As a preferred scheme of the present application, a part of the air enters the primary swirl flow channel through the primary swirl flow inlet, and another part of the air enters the secondary swirl flow channel through the secondary swirl flow inlet; the air entering the primary swirl flow inlet is subjected to the action of the primary swirl flow generator to generate swirl flow gas, and the swirl flow gas flows through the neck of the primary swirl flow shell to blow toward the fuel, thereby providing aerodynamic force for atomization of the fuel; the air entering the secondary swirl flow inlet is subjected to the action of the secondary swirl flow generator to generate swirl flow gas, and the swirl flow gas is injected into the oil mist along the flow direction of the secondary swirl flow, thereby providing aerodynamic force for re-atomization of the fuel, and also providing carrier gas for formation of the three-dimensional sliding arc.

[0016] As a preferred scheme of the present application, if the main oil path is used alone, the fuel entering the main oil path fuel inlet is subjected to the action of the centrifugal fuel nozzle along the flow direction of the fuel in the main oil path, and after the fuel leaves the orifice, the fuel is spread into a thin liquid film under the action of centrifugal force, and through the action of the primary swirl flow gas and the secondary swirl flow gas, the liquid film gradually develops into a ligament, and finally breaks into a droplet group under the action of aerodynamic force, thereby generating rotating oil mist at the outlet of the centrifugal fuel nozzle, and the oil mist is injected into the combustion chamber under the action of aerodynamic force.

[0017] As a preferred scheme of the present application, if the auxiliary oil path is used alone, the fuel entering the auxiliary oil path fuel inlet flows along the flow direction of the fuel in the auxiliary oil path, and is injected out through the auxiliary oil path fuel nozzle, and the fuel injected out through the plurality of straight injection orifices collides at a close distance, and the oil mist generated by the collision is injected into the combustion chamber under the action of aerodynamic force.

[0018] As a preferred scheme of the present application, if the main oil way and the auxiliary oil way are used in cooperation, the fuel entering the main oil way flows along the fuel flow direction of the main oil way, and under the action of the centrifugal fuel nozzle, the fuel generates a rotating flow, and after the fuel leaves the nozzle, the fuel of the main oil way spreads into a thick fuel liquid film under the action of the centrifugal force, at this time, the fuel sprayed by the fuel nozzle of the auxiliary oil way is shot at the fuel liquid film, so that the fuel liquid film is broken into a liquid drop group, and under the action of the aerodynamic force, the fuel is sprayed into the combustion chamber.

[0019] As a preferred scheme of the present application, after the power is turned on, a sliding arc along the flow direction of the secondary rotating flow is generated between the high-voltage electrode and the low-voltage electrode, the sliding arc continuously slides and develops under the pushing of the flow, and finally contacts the fuel spray, so that the fuel spray is vaporized and ignited by the high-temperature effect of the sliding arc; after the ignition is successful, the power still works, the flow of the primary rotating flow is increased, and the flow of the secondary rotating flow is reduced, so that the sliding arc is extinguished before it contacts the fuel, at this time, the fuel is continuously vaporized, ionized and cracked into active groups and fuel small molecules to participate in combustion by the sliding arc; at the same time, the secondary rotating flow also cools the high-voltage electrode and the low-voltage electrode.

[0020] The present application can achieve the following technical effects due to the above technical scheme:

[0021] 1. In the head of the combustion chamber, the cross-collision and the centrifugal nozzle are coupled. Based on the characteristics of the centrifugal nozzle, the fuel of the auxiliary oil way will impact the centrifugal fuel liquid film of the main oil way, so that the fuel is well atomized before being ignited at the nozzle. When the fuel is ignited, the high-temperature effect of the sliding arc will further atomize the fuel and generate active particles to participate in combustion. This design solves the problem of insufficient combustion and low combustion efficiency caused by poor atomization effect.

[0022] 2. The swirling action of the secondary rotating flow increases the volume coverage range of the sliding arc, thereby solving the problem of low ignition energy caused by small fire core. At the same time, the ignition device is coupled in the head and separated from the flame, and the secondary rotating flow continuously cools the high-voltage electrode and the low-voltage electrode. This design solves the problem of short service life of the traditional igniter in a high-temperature environment.

[0023] 3. The present application significantly enhances the atomization effect of the fuel, improves the ignition performance, and fully utilizes the space of the combustion chamber, thereby improving the combustion efficiency. This makes the fuel fully react with air in a short time, reduces the loss as much as possible, and further improves the combustion efficiency. Therefore, the combustion chamber can provide greater thrust for the aero-engine. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Figure 1 Cross-sectional view of the head structure of the sliding arc ignition combustion chamber coupled with centrifugal nozzle and impinging spray;

[0026] Figure 2 Three-dimensional view of the head structure of the sliding arc ignition combustion chamber coupled with centrifugal nozzle and impinging spray;

[0027] Figure 3 Working schematic view of the head structure of the sliding arc ignition combustion chamber coupled with centrifugal nozzle and impinging spray;

[0028] Figure 4 Circuit connection schematic view of the head structure of the sliding arc ignition combustion chamber coupled with centrifugal nozzle and impinging spray;

[0029] Figure number explanation: 1 sealing gasket, 2 secondary oil path fuel inlet, 3 primary swirl shell, 4 sliding arc insulation layer, 5 primary swirler, 6 secondary swirler, 7 centrifugal fuel nozzle, 8 secondary swirl shell, 9 secondary oil path fuel nozzle, 10 secondary swirl gas inlet, 11 primary swirl gas inlet, 12 fixed platform, 13 main oil path fuel inlet, 14 main oil path fuel flow direction, 15 secondary oil path fuel flow direction, 16 active particles, 17 sliding arc, 18 fuel spray, 19 secondary swirl gas flow direction, 20 primary swirl gas flow direction. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set 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.

[0032] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can include, explicitly or implicitly, one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless explicitly specified otherwise. The meaning of "several" is one or more, unless explicitly specified otherwise.

[0033] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0034] In the description of the present application, it should be noted that unless explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The existing inflow speed in the combustion chamber of the aero-engine is fast and the space is small, which causes the fuel to be ignited when the atomization is poor, the combustion is insufficient, and the combustion efficiency is reduced; and the traditional ignition mode has a small ignition core, which causes low ignition energy, and the igniter of the traditional ignition mode is in a high-temperature environment in the backflow area, which bears a large heat load, reducing the service life of the igniter. Therefore, the embodiment provides a sliding arc ignition combustion chamber head structure coupled with a centrifugal nozzle and a collision spray, as shown in Figures 1-2 , which comprises:

[0036] A primary swirling shell is tapered in shape and has a primary swirler inside, preferably made of metal material. The primary swirling shell is connected to an external power supply as a high-voltage electrode.

[0037] A centrifugal fuel nozzle is connected to the main oil path and located in the cavity of the primary swirling shell, which can make the fuel in the main oil path swirl and spray into the combustion chamber.

[0038] The auxiliary oil channel fuel nozzle is connected with the auxiliary oil channel and located in the wall of the primary swirl shell; the auxiliary oil channel fuel nozzle is provided with a plurality of direct injection orifices, and the plurality of direct injection orifices share an annular oil channel for oil supply.

[0039] The secondary swirl shell is in a shape of gradually expanding, and is internally provided with a secondary swirl generator; preferably, the secondary swirl generator is selected from insulating materials; the secondary swirl shell is simultaneously connected with the low-voltage electrode and the power supply grounding end;

[0040] The sliding arc insulation layer is arranged between the primary swirl shell and the secondary swirl shell, and separates the high-voltage electrode and the low-voltage electrode;

[0041] The fixed table is arranged at the end of the primary swirl shell, and the sealing gasket is arranged between the primary swirl shell and the fixed table, so as to ensure the sealing effect between the primary swirl shell and the fixed table.

[0042] As shown in Figure 3 part of the air enters the primary swirl gas channel through the primary swirl gas inlet 11, and the other part of the air enters the secondary swirl gas channel through the secondary swirl gas inlet 10. The air entering from the primary swirl gas inlet 11 is subjected to the action of the primary swirl generator 5 to generate swirl gas along the primary swirl gas flow direction 20, and the swirl gas flows through the neck of the primary swirl shell 3 and blows to the fuel oil to provide aerodynamic force for the atomization of the fuel oil. The air entering from the secondary swirl gas inlet 10 is subjected to the action of the secondary swirl generator 6 to generate swirl gas, and the swirl gas is sprayed into the oil mist along the secondary swirl gas flow direction 19 to provide aerodynamic force for the secondary atomization of the fuel oil, and also provides carrier gas for the formation of the three-dimensional sliding arc.

[0043] The head structure of the present application is provided with two groups of fuel nozzles, one group is the centrifugal fuel nozzle 7, and the other group is the auxiliary oil channel fuel nozzle 9; the two groups of nozzles can be selected to be used alone or cooperatively, so that not only the sufficient supply of fuel oil under different working conditions can be ensured, but also the atomization effect of the fuel oil can be improved.

[0044] If the main oil path is used alone, the fuel entering from the main oil path fuel inlet 13 flows along the main oil path fuel flow direction 14 and is subjected to a rotational flow by the centrifugal fuel nozzle 7. After the fuel exits the nozzle, it is subjected to a thin liquid film by the centrifugal force. The liquid film is gradually developed into a thread by the action of the first and second rotational flow gas, and finally broken into a droplet group by the action of the aerodynamic force. The rotating oil mist at the outlet of the centrifugal fuel nozzle 7 is sprayed into the combustion chamber under the action of the aerodynamic force. If the auxiliary oil path is used alone, the fuel entering from the auxiliary oil path fuel inlet 2 flows along the auxiliary oil path fuel flow direction 15 and is sprayed out through the auxiliary oil path fuel nozzle 9. The fuel sprayed out of the multiple straight jet nozzles collides at a close distance, and the well-atomized oil mist is sprayed into the combustion chamber under the action of the aerodynamic force. If the main and auxiliary oil paths are used together, the fuel entering from the main oil path fuel inlet 13 flows along the main oil path fuel flow direction 14 and is subjected to a rotational flow by the centrifugal fuel nozzle 7. After the fuel exits the nozzle, the high-oil-content main oil path fuel is subjected to a relatively thick fuel liquid film by the centrifugal force. At this time, the fuel sprayed out of the auxiliary oil path fuel nozzle 9 is directed at the fuel liquid film, causing it to break into a droplet group. The fuel sprayed out of the main and auxiliary oil paths forms a droplet group, which is sprayed into the combustion chamber under the action of the aerodynamic force.

[0045] As shown in Figure 4 , the first rotational flow outer shell 3 acts as a high-voltage electrode, and the second rotational flow outer shell 8 acts as a low-voltage electrode. When ignition occurs, the flow of the second rotational flow gas needs to be adjusted to a high level to ensure that the sliding arc can move smoothly to the oil mist area. After the power is turned on, a sliding arc 17 along the second rotational flow gas flow direction 19 is generated between the high-voltage and low-voltage electrodes. The sliding arc 17 continuously slides and develops under the push of the gas flow, and finally contacts the oil mist. The fuel spray 18 is vaporized and ignited by the high-temperature effect of the sliding arc; after successful ignition, the power is still working, the flow of the first rotational flow gas is increased, and the flow of the second rotational flow gas is reduced, so that the sliding arc is extinguished before it contacts the fuel. At this time, the fuel is continuously vaporized, ionized and cracked into active groups and small fuel molecules by the sliding arc to participate in combustion. At the same time, the second rotational flow gas can also cool the high-voltage and low-voltage electrodes to prevent them from being damaged by high temperature.

[0046] The working process of the head structure of the sliding arc ignition combustion chamber coupled with the centrifugal nozzle and the collision spray is as follows:

[0047] S1: Air enters the first rotational flow gas channel and the second rotational flow gas channel through the first rotational flow gas inlet 11 and the second rotational flow gas inlet 10, respectively, and forms a rotating gas flow under the action of the first rotational flow device and the second rotational flow device.

[0048] S2: According to the different working conditions, the main and auxiliary oil paths can be adjusted to work in a single mode or a cooperative mode. If the main oil path is used alone, fuel flows through the main oil path fuel inlet 13 and is sprayed out through the centrifugal fuel nozzle 7. If the auxiliary oil path is used alone, fuel flows through the auxiliary oil path fuel inlet 2 and is sprayed out through the straight jet orifice of the auxiliary oil path fuel nozzle 9, and the fuel sprayed out through multiple straight jet orifices collides at a short distance, and then the fuel is sprayed into the combustion chamber under the action of the aerodynamic force. If the main and auxiliary oil paths are used cooperatively, the fuel of the main oil path flows through the main oil path fuel inlet 13 and is sprayed out through the centrifugal fuel nozzle 7, and at the same time, the fuel of the auxiliary oil path flows through the auxiliary oil path fuel inlet 2 and is sprayed out through the straight jet orifice of the auxiliary oil path fuel nozzle 9, and the atomized fuel spray is sprayed into the combustion chamber.

[0049] S5: The power supply is turned on, the secondary rotational flow gas flow is increased, the sliding arc is generated between the high-voltage electrode and the low-voltage electrode, and under the pushing of the gas flow, the sliding arc continuously slides and develops, and finally contacts the oil mist, and the fuel is ignited through the high-temperature effect of the sliding arc.

[0050] S6: After the ignition is successful, the secondary rotational flow gas flow is reduced, the power supply continues to work, and the active groups and excited state particles generated in the movement process of the sliding arc participate in the combustion and enhance the atomization.

[0051] The present application sets multiple straight jet orifices in the auxiliary oil path, impacts the liquid film sprayed out by the centrifugal nozzle of the main oil path, breaks the liquid film sprayed out by the centrifugal nozzle of the main oil path into droplet groups, and improves the atomization effect of the fuel. The present application uses the rotating sliding arc to ignite, changes the power supply parameters and reduces the secondary rotational flow gas flow after the ignition is successful, so that the sliding arc is extinguished before it contacts the fuel, the active particles generated by the sliding arc assist the combustion of the fuel, and the high-temperature effect of the sliding arc vaporizes the fuel to improve the atomization of the fuel.

[0052] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sliding arc ignition combustion chamber head structure with centrifugal nozzle and collision spray coupling, characterized in that: include: A first-stage cyclone housing, which houses a first-stage cyclone and serves as a high-voltage electrode connected to an external power source; A centrifugal fuel nozzle connected to the main fuel line and located in the cavity of the first-stage swirl housing; Auxiliary oil circuit fuel nozzle, connected to the auxiliary oil circuit and located in the wall of the first-stage swirl shell; The secondary cyclone housing has a secondary cyclone inside, and the secondary cyclone housing also serves as a low-voltage electrode connected to the power ground terminal; The sliding arc insulating layer is arranged between the primary cyclone shell and the secondary cyclone shell to separate the high-voltage electrode from the low-voltage electrode.

2. The sliding arc ignition combustion chamber head structure of a centrifugal nozzle coupled with collision spray according to claim 1, characterized in that: The auxiliary oil circuit fuel nozzle is provided with a plurality of direct injection spray holes, and the plurality of direct injection spray holes share a common annular oil circuit for oil supply.

3. The sliding arc ignition combustion chamber head structure of a centrifugal nozzle coupled with collision spray according to claim 1, characterized in that: The primary cyclone is located between the inner wall of the primary cyclone shell and the outer wall of the centrifugal nozzle, so that the air flowing through the inlet of the primary cyclone generates a swirl.

4. The sliding arc ignition combustion chamber head structure of a centrifugal nozzle coupled with collision spray according to claim 1, characterized in that: The secondary cyclone is located between the outer wall of the primary cyclone shell and the inner wall of the secondary cyclone shell, so that the air flowing through the inlet of the secondary cyclone generates a swirl and forms a three-dimensional sliding arc between the high-voltage electrode and the low-voltage electrode.

5. The sliding arc ignition combustion chamber head structure of a centrifugal nozzle coupled with collision spray according to claim 1, characterized in that: The end of the primary cyclone shell is provided with a fixing platform. The sealing gasket is located between the first-stage cyclone housing and the fixed platform.

6. The sliding arc ignition combustion chamber head structure with centrifugal nozzle and collision spray coupled according to claim 1, characterized in that: Part of the air enters the primary swirl air channel through the primary swirl air inlet, and the other part of the air enters the secondary swirl air channel through the secondary swirl air inlet. The air entering from the primary swirl air inlet is acted upon by the primary swirler along the flow direction of the primary swirl air to generate swirl gas. The swirl gas then flows through the constriction of the primary swirl shell and is blown toward the fuel, providing aerodynamic force for the atomization of the fuel. The air entering from the secondary swirl air inlet is acted upon by the secondary swirler to generate swirl gas. The swirl gas is sprayed into the oil mist along the flow direction of the secondary swirl gas, providing aerodynamic force for the re-atomization of the fuel and also providing carrier gas for the formation of the three-dimensional sliding arc.

7. The sliding arc ignition combustion chamber head structure of a centrifugal nozzle coupled with collision spray according to claim 1, characterized in that: If the main oil circuit is used alone, the fuel entering from the main oil circuit fuel inlet will generate a swirl along the flow direction of the main oil circuit fuel under the action of the centrifugal fuel nozzle. After the fuel leaves the nozzle, it will be expanded into a thin liquid film under the action of centrifugal force. Through the action of the first-level swirl gas and the second-level swirl gas, the liquid film gradually develops into a tether, and finally is completely broken into a group of droplets under the action of aerodynamic force, and then a rotating oil mist is generated at the outlet of the centrifugal fuel nozzle, which is sprayed into the combustion chamber under the action of aerodynamic force.

8. The sliding arc ignition combustion chamber head structure with centrifugal nozzle and collision spray coupled according to claim 1, characterized in that: If the auxiliary oil circuit is used alone, the fuel entering from the auxiliary oil circuit fuel inlet flows along the auxiliary oil circuit fuel flow direction and is sprayed out through the auxiliary oil circuit fuel nozzle. The fuel sprayed from multiple direct-injection nozzles collides at a close distance, and the oil mist generated by the collision is sprayed into the combustion chamber under the action of aerodynamic force.

9. The sliding arc ignition combustion chamber head structure with centrifugal nozzle and collision spray coupled according to claim 1, characterized in that: If the main oil circuit and the auxiliary oil circuit are used in coordination, the fuel entering the main oil circuit fuel inlet flows along the flow direction of the main oil circuit fuel, and generates a swirl under the action of the centrifugal fuel nozzle. After the fuel leaves the nozzle, the main oil circuit fuel expands into a fuel liquid film under the action of centrifugal force. At this time, the fuel sprayed from the auxiliary oil circuit fuel nozzle is ejected towards the fuel liquid film, breaking it into a group of droplets, and then sprayed into the combustion chamber under the action of aerodynamic force.

10. The sliding arc ignition combustion chamber head structure coupled with a centrifugal nozzle and collision spray according to claim 1, characterized in that: After the power is turned on, a sliding arc is generated between the high-voltage electrode and the low-voltage electrode along the flow direction of the secondary swirl gas. The sliding arc continues to slide and develop under the push of the airflow, and finally comes into contact with the fuel spray. The fuel spray is vaporized and ignited through the high temperature effect of the sliding arc. After successful ignition, the power supply continues to work, increasing the flow rate of the first-level swirl gas and reducing the flow rate of the second-level swirl gas, so that the sliding arc is extinguished just before it contacts the fuel. At this time, the fuel is continuously vaporized, ionized and cracked by the sliding arc into active groups, and small fuel molecules participate in combustion. At the same time, the secondary swirl gas also cools the high-voltage electrode and the low-voltage electrode.

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