Sliding arc ignition combustion chamber head structure with centrifugal nozzle and collision spray coupled

Abstract

The invention discloses a sliding arc ignition combustion chamber head structure with a centrifugal nozzle coupled with collision spray, and relates to the technical field of aero-engines. Comprising a first-stage cyclone shell which is internally provided with a first-stage cyclone, and the first-stage cyclone shell serves as a high-voltage electrode to be connected to an external power supply; the centrifugal fuel oil nozzle is connected with the main oil way and is positioned in the cavity of the first-stage rotational flow shell; the auxiliary oil way fuel nozzle is connected with the auxiliary oil way and located in the wall body of the first-stage rotational flow shell; a second-stage cyclone is arranged in the second-stage cyclone shell, and the second-stage cyclone shell is simultaneously used as a low-voltage electrode to be connected with the grounding end of the power supply; and the sliding arc insulating layer is arranged between the first-stage rotational flow shell and the second-stage rotational flow shell and separates the high-voltage electrode from the low-voltage electrode. According to the invention, the atomization effect of fuel oil is obviously enhanced, the ignition performance is improved, and the space of the combustion chamber is fully utilized, so that the combustion efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a sliding arc ignition combustion chamber head structure in which a centrifugal nozzle and collision spray are coupled. Background Art

[0002] The combustion chamber of an aircraft engine releases heat energy through a chemical reaction between fuel and oxygen in the air, thereby providing thrust for the aircraft. Among them, the fuel nozzle and igniter, as the core components of the combustion chamber head, have a crucial impact on the performance of the combustion chamber. At present, the improvement of the combustion chamber head of an aircraft engine mainly focuses on the following directions: 1. Improvement of the fuel nozzle: By continuously optimizing the structure of the fuel nozzle, the spray field and flow field in the combustion chamber can be improved, so that the fuel burns more fully, thereby improving the combustion efficiency. However, the centrifugal nozzle commonly used in aircraft engines is easily affected by the swirl near the fuel nozzle, forming a layer of liquid film, which hinders the atomization effect of the fuel. 2. Optimization of the igniter: By continuously improving the structure of the igniter, the ignition process can be achieved quickly, reliably and smoothly, thereby improving the overall reliability of the aircraft engine. However, the existing ignition method has the problems of low ignition energy and large heat load, which will shorten the service life of the igniter. 3. Improvement of head flow field: By using 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 reduce the flow loss of the fluid in the combustion chamber head, thereby improving the combustion efficiency of the aircraft engine. However, the flow field of the combustion chamber head is affected by many factors, and it is not only costly but also time-consuming to find a combustion chamber structure with the best flow field through experiments.

[0003] The application number is CN202111076920.8, and the name is a Chinese invention patent application for a combined dielectric barrier discharge plasma aircraft engine combustion chamber head. It is characterized in that the plasma is generated by a flat plate and a cylindrical dielectric barrier discharge method to contact the fuel and air entering the combustion chamber. The disadvantage is that the DBD plasma generated from the secondary vortex is difficult to contact the fuel, and the atomization effect of the fuel is poor. The application number is CN202111019264.8, and the name is a Chinese invention patent application for a DBD plasma blade-type axial swirler in the head of an aircraft engine combustion chamber. It is characterized in that the swirler of the head is used to generate DBD plasma, and a high concentration of active particles is generated in the airflow channel position of the swirler blade without affecting the original aircraft engine head. The disadvantage is that when the swirler is used to generate DBD plasma, due to the precision and small size of the swirler blades, the two sides are easily directly broken down when used as discharge electrodes and low-voltage electrodes, thereby causing damage to the swirler. The Chinese invention patent application with application number CN202011305935.2, titled "Injection device, combustion chamber head, combustion chamber and aircraft engine", is characterized in that the head is coupled with multiple pre-film atomizing nozzles, which are divided into pre-combustion stage, intermediate stage and main combustion stage. Its disadvantage is that the structure is more complicated and heavier than the traditional combustion chamber structure, which reduces the thrust-to-weight ratio of the aircraft engine. Summary of the invention

[0004] The object of the present invention is to provide a sliding arc ignition combustion chamber head structure in which a centrifugal nozzle is coupled with a collision spray, and the air introduced from the duct is used to form a three-dimensional sliding arc ignition to enhance the effect of fuel atomization.

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

[0006] A primary cyclone housing, in which a primary cyclone is arranged, and the primary cyclone housing is also connected to an external power supply as a high-voltage electrode;

[0007] A centrifugal fuel nozzle connected to the main fuel line and located in the cavity of the primary swirl housing;

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

[0009] A secondary cyclone housing, inside which a secondary cyclone is arranged, and the secondary cyclone housing also serves as a low-voltage electrode connected to the grounding terminal of the power supply;

[0010] 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.

[0011] As a preferred solution of the present invention, 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.

[0012] As a preferred solution of the present invention, the primary cyclone is located between the inner wall of the primary cyclone housing and the outer wall of the centrifugal nozzle, so that the air flowing through the inlet of the primary cyclone generates a swirl.

[0013] As a preferred solution of the present invention, 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.

[0014] As a preferred solution of the present invention, a fixing platform is provided at the end of the primary cyclone shell, and a sealing gasket is located between the primary cyclone shell and the fixing platform.

[0015] As a preferred embodiment of the present invention, a part of the air enters the primary cyclone gas channel through the primary cyclone gas inlet, and the other part of the air enters the secondary cyclone gas channel through the secondary cyclone gas inlet; the air entering from the primary cyclone gas inlet is acted upon by the primary cyclone device along the flow direction of the primary cyclone gas to generate cyclone gas, and the cyclone gas then flows through the constriction of the primary cyclone shell and blows toward the fuel, providing aerodynamic force for the atomization of the fuel; the air entering from the secondary cyclone gas inlet generates cyclone gas under the action of the secondary cyclone device, and the cyclone gas is sprayed into the oil mist along the flow direction of the secondary cyclone gas, providing aerodynamic force for the re-atomization of the fuel, and also providing carrier gas for the formation of a three-dimensional sliding arc.

[0016] As a preferred embodiment of the present invention, if the main oil circuit is used alone, the fuel entering from the fuel inlet of the main oil circuit generates a swirl along the flow direction of the fuel in the main oil circuit under the action of the centrifugal fuel nozzle. After the fuel leaves the nozzle, it is expanded into a thin liquid film under the action of centrifugal force. Through the action of the primary swirl gas and the secondary swirl gas, the liquid film gradually develops into a tie wire, and finally is completely broken into a group of droplets under the action of aerodynamic force, thereby generating a rotating oil mist at the outlet of the centrifugal fuel nozzle, which is sprayed into the combustion chamber under the action of aerodynamic force.

[0017] As a preferred embodiment of the present invention, 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 through the auxiliary oil circuit fuel nozzle. The fuel sprayed from multiple direct-injection spray holes 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.

[0018] As a preferred embodiment of the present invention, if the main oil circuit and the auxiliary oil circuit are used in coordination, the fuel entering the fuel inlet of the main oil circuit flows along the flow direction of the main oil circuit fuel, and generates a vortex under the action of the centrifugal fuel nozzle. After the fuel leaves the nozzle, the main oil circuit fuel expands into a thicker 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, which are sprayed into the combustion chamber under the action of aerodynamic force.

[0019] As a preferred embodiment of the present invention, 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 continuously slides and develops under the impetus of the airflow, and finally contacts the fuel spray. The fuel spray is vaporized and ignited by the high temperature effect of the sliding arc. After the ignition is successful, the power supply is still working, the flow rate of the first-level swirl gas is increased, and the flow rate of the second-level swirl gas is reduced, 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 molecules of fuel participate in combustion. At the same time, the secondary swirl gas also cools the high-voltage electrode and the low-voltage electrode.

[0020] The present invention adopts the above technical solution, and can achieve the following technical effects:

[0021] 1. At the head of the combustion chamber, the cross-collision and centrifugal nozzles are coupled. Based on the characteristics of the centrifugal nozzle, the fuel in the auxiliary oil circuit will impact the centrifugal fuel liquid film in the main oil circuit, so that the fuel achieves a good atomization effect before it is 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 incomplete combustion and low combustion efficiency caused by poor atomization effect.

[0022] 2. The swirl effect of the secondary swirl gas is used to increase the volume coverage of the sliding arc, thereby solving the problem of low ignition energy caused by a small fire core. At the same time, the ignition device is coupled to the head and separated from the flame, while the secondary swirl gas continuously cools the high and low voltage electrodes. This design solves the problem of short life of traditional igniters in high temperature environments.

[0023] 3. The present invention 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 allows the fuel to fully react with the air in a short time, minimizes the loss, and further improves the combustion efficiency. Therefore, the combustion chamber can provide greater thrust for the aircraft engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

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

[0026] Figure 2 A three-dimensional diagram of the head structure of the sliding arc ignition combustion chamber coupled with a centrifugal nozzle and collision spray;

[0027] Figure 3 The schematic diagram of the working structure of the sliding arc ignition combustion chamber head with centrifugal nozzle and collision spray coupling;

[0028] Figure 4 It is a schematic diagram of the circuit connection of the sliding arc ignition combustion chamber head structure of the centrifugal nozzle and the collision spray coupling;

[0029] Explanation of serial numbers in the figure: 1 sealing gasket, 2 auxiliary oil circuit fuel inlet, 3 primary swirl housing, 4 sliding arc insulating layer, 5 primary swirler, 6 secondary swirler, 7 centrifugal fuel nozzle, 8 secondary swirl housing, 9 auxiliary oil circuit fuel nozzle, 10 secondary swirl gas inlet, 11 primary swirl gas inlet, 12 fixing platform, 13 main oil circuit fuel inlet, 14 main oil circuit fuel flow direction, 15 auxiliary oil circuit 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 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The existing aircraft engine combustion chamber has a fast incoming flow speed and a small space, which causes the fuel to be ignited when the atomization is poor, resulting in incomplete combustion, thereby reducing the combustion efficiency; and the traditional ignition method has a small fire core, which leads to low ignition energy, and the igniter of the traditional ignition method is in a high temperature environment in the reflow zone, and the heat load is large, which reduces the life of the igniter. Therefore, this embodiment provides a sliding arc ignition combustion chamber head structure that couples a centrifugal nozzle with a collision spray, such as Figure 1-2 As shown, including:

[0036] The primary cyclone housing is of a tapered shape and is provided with a primary cyclone inside. Preferably, the primary cyclone is made of metal material. The primary cyclone housing is also connected to an external power supply as a high-voltage electrode;

[0037] The centrifugal fuel nozzle is connected to the main oil circuit and is located in the cavity of the primary swirl housing, and can make the fuel in the main oil circuit swirl and spray into the combustion chamber;

[0038] The auxiliary oil circuit fuel nozzle is connected to the auxiliary oil circuit and is located in the wall of the primary swirl shell; 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 ring oil circuit for oil supply.

[0039] The secondary cyclone housing is of a gradually expanding shape and is provided with a secondary cyclone inside. Preferably, the secondary cyclone is made of insulating material; the secondary cyclone housing is also connected to the ground terminal of the power supply as a low-voltage electrode;

[0040] The sliding arc insulating layer is arranged between the primary cyclone housing and the secondary cyclone housing to separate the high-voltage electrode from the low-voltage electrode;

[0041] The fixing platform is arranged at the end of the primary cyclone shell, and the sealing gasket is located between the primary cyclone shell and the fixing platform to ensure the sealing effect between the two.

[0042] like Figure 3 As shown, part of the air enters the primary cyclone gas channel through the primary cyclone gas inlet 11, and the other part of the air enters the secondary cyclone gas channel through the secondary cyclone gas inlet 10. The air entering from the primary cyclone gas inlet 11 is acted on by the primary cyclone 5 along the primary cyclone gas flow direction 20 to generate cyclone gas, and the cyclone gas then flows through the constriction of the primary cyclone housing 3 and blows toward the fuel, providing aerodynamic force for the atomization of the fuel. The air entering from the secondary cyclone gas inlet 10 generates cyclone gas under the action of the secondary cyclone 6, and the cyclone gas is sprayed into the oil mist along the secondary cyclone gas flow direction 19, providing aerodynamic force for the re-atomization of the fuel, and also providing carrier gas for the formation of a three-dimensional sliding arc.

[0043] The head structure of the present invention is provided with two groups of fuel nozzles, one group is a centrifugal fuel nozzle 7, and the other group is a secondary oil circuit fuel nozzle 9. The two groups of nozzles can be used separately or in coordination, which can not only ensure sufficient fuel supply under different working conditions, but also improve the atomization effect of the fuel.

[0044] If the main oil circuit is used alone, the fuel entering from the main oil circuit fuel inlet 13 will generate a swirl along the main oil circuit fuel flow direction 14 under the action of the centrifugal fuel nozzle 7. 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 primary and secondary swirl gas, the liquid film will gradually develop into a tie wire, and finally be completely broken into a group of droplets under the action of aerodynamic force, and then a rotating oil mist will be generated at the outlet of the centrifugal fuel nozzle 7 and sprayed into the combustion chamber under the action of aerodynamic force. If the auxiliary oil circuit is used alone, the fuel entering from the auxiliary oil circuit fuel inlet 2 will flow along the auxiliary oil circuit fuel flow direction 15 and be sprayed through the auxiliary oil circuit fuel nozzle 9. The fuel sprayed from multiple direct injection nozzles will collide at a close distance, and the well-atomized oil mist generated by the collision will be sprayed into the combustion chamber under the action of aerodynamic force. If the main and auxiliary oil circuits are used in coordination, the fuel entering the main oil circuit fuel inlet 13 flows along the main oil circuit fuel flow direction 14, and generates a swirl under the action of the centrifugal fuel nozzle 7. After the fuel leaves the nozzle, the main oil circuit fuel with a high oil volume expands into a thicker fuel liquid film under the action of centrifugal force. At this time, the fuel sprayed from the auxiliary oil circuit fuel nozzle 9 is ejected towards the fuel liquid film, breaking it into droplet groups, and then the fuel sprayed from the main and auxiliary oil circuits forms droplet groups, which are sprayed into the combustion chamber under the action of aerodynamic force.

[0045] like Figure 4 As shown, the primary cyclone housing 3 serves as a high-voltage electrode, and the secondary cyclone housing 8 serves as a low-voltage electrode. During ignition, in order to ensure that the sliding arc can smoothly move to the oil mist area, the secondary cyclone air flow rate needs to be increased. After the power is turned on, a sliding arc 17 is generated between the high and low voltage electrodes along the flow direction 19 of the secondary cyclone gas. The sliding arc 17 continuously slides and develops under the impetus of the air 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 the ignition is successful, the power supply is still working, the primary cyclone air flow rate is increased, and the secondary cyclone air flow rate is reduced, 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 the fuel small molecules participate in the combustion. At the same time, the secondary cyclone gas can also cool the high and low voltage electrodes to ensure that the high and low voltage electrodes will not be damaged by high temperature.

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

[0047] S1: Air enters the primary cyclone gas channel and the secondary cyclone gas channel through the primary cyclone gas inlet 11 and the secondary cyclone gas inlet 10 respectively, and forms a swirling airflow under the action of the primary cyclone and the secondary cyclone.

[0048] S2: Depending on the working conditions, the main and auxiliary oil circuits can be adjusted to work alone or in coordination. If the main oil circuit is used alone, the fuel flows through the main oil circuit fuel inlet 13 and is sprayed through the centrifugal fuel nozzle 7; if the auxiliary oil circuit is used alone, the fuel flows through the auxiliary oil circuit fuel inlet 2 and is sprayed through the direct spray holes on the auxiliary oil circuit fuel nozzle 9. The fuel sprayed from multiple direct spray holes collides at a close distance, and then the fuel is sprayed into the combustion chamber under the action of aerodynamic force; if the main and auxiliary oil circuits are used in coordination, then at this time, the main oil circuit fuel flows through the main oil circuit fuel inlet 13 and is sprayed through the centrifugal fuel nozzle 7, and at the same time, the auxiliary oil circuit fuel flows through the auxiliary oil circuit fuel inlet 2 and is sprayed through the direct spray holes on the auxiliary oil circuit fuel nozzle 9, and the atomized fuel spray is sprayed into the combustion chamber.

[0049] S5: Turn on the power and increase the secondary swirl airflow. A sliding arc is generated between the high-voltage electrode and the low-voltage electrode. The sliding arc continues to slide and develop under the push of the airflow, and finally comes into contact with the oil mist. The high temperature effect of the sliding arc ignites the fuel.

[0050] S6: After successful ignition, the secondary swirl gas flow rate is reduced, the power supply continues to work, and the sliding arc continuously generates active groups and excited state particles during the movement to participate in combustion and enhance atomization.

[0051] The present invention arranges a plurality of direct-injection spray holes in the auxiliary oil circuit to impact the liquid film sprayed by the centrifugal nozzle of the main oil circuit, so that the liquid film sprayed by the centrifugal nozzle of the main oil circuit is broken into a group of droplets, thereby improving the atomization effect of the fuel. The present invention utilizes a rotating sliding arc for ignition, and after successful ignition, changes power supply parameters and reduces the secondary swirl airflow rate, so that the sliding arc is extinguished just before it contacts the fuel, and the active particles generated by the sliding arc assist the combustion of the fuel, and utilize the high temperature effect to vaporize the fuel to improve the atomization of the fuel.

[0052] 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 sliding arc ignition combustion chamber head structure with centrifugal nozzle and collision spray coupling, characterized in that: include: A primary cyclone housing, in which a primary cyclone is arranged, and the primary cyclone housing is also connected to an external power supply as a high-voltage electrode; A centrifugal fuel nozzle connected to the main fuel line and located in the cavity of the primary swirl housing; A secondary oil circuit fuel nozzle, connected to the secondary oil circuit and located in the wall of the primary swirl casing; A secondary cyclone housing, inside which a secondary cyclone is arranged, and the secondary cyclone housing also serves as a low-voltage electrode connected to the grounding terminal of the power supply; 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. According to claim 1, a sliding arc ignition combustion chamber head structure with a centrifugal nozzle and collision spray coupled, 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. According to claim 1, a sliding arc ignition combustion chamber head structure with a centrifugal nozzle and collision spray coupled, 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. According to claim 1, a sliding arc ignition combustion chamber head structure with a centrifugal nozzle and collision spray coupled is 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 swirl and forms a three-dimensional sliding arc between the high-voltage electrode and the low-voltage electrode.

5. According to claim 1, a sliding arc ignition combustion chamber head structure with a centrifugal nozzle and collision spray coupled is characterized in that: A fixing platform is provided at the end of the primary cyclone shell, and a sealing gasket is located between the primary cyclone shell and the fixing platform.

6. The sliding arc ignition combustion chamber head structure of the centrifugal nozzle and collision spray coupling according to claim 1 is characterized in that: Part of the air enters the primary swirl gas channel through the primary swirl gas inlet, and the other part of the air enters the secondary swirl gas channel through the secondary swirl gas inlet; the air entering from the primary swirl gas inlet is acted upon by the primary swirler along the flow direction of the primary swirl gas to generate swirl gas, and the swirl gas then flows through the contraction of the primary swirl shell and blows toward the fuel, providing aerodynamic force for the atomization of the fuel; the air entering from the secondary swirl gas inlet generates swirl gas under the action of the secondary swirler, and 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 a three-dimensional sliding arc.

7. The sliding arc ignition combustion chamber head structure of the centrifugal nozzle and collision spray coupling according to claim 1 is 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 expand into a thin liquid film under the action of centrifugal force. Through the action of the primary swirl gas and the secondary swirl gas, the liquid film gradually develops into a tie thread, and finally is completely broken into a group of droplets under the action of aerodynamic force, thereby generating a rotating oil mist 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 of the centrifugal nozzle and collision spray coupling according to claim 1 is 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 spray holes 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 of the centrifugal nozzle and collision spray coupling 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 thicker fuel liquid film under the action of centrifugal force. At this time, the fuel sprayed from the auxiliary oil circuit fuel nozzle shoots towards the fuel liquid film, breaking it into a group of droplets, which are then sprayed into the combustion chamber under the action of aerodynamic force.

10. The sliding arc ignition combustion chamber head structure of the centrifugal nozzle and collision spray coupling 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 slides and develops continuously under the push of the airflow, and finally contacts the fuel spray. The fuel spray is vaporized and ignited by the high temperature effect of the sliding arc. After the ignition is successful, the power supply is still working, 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 molecules of fuel 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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