CN110344975B - Working method of dual-fuel nozzle of engine - Google Patents
Working method of dual-fuel nozzle of engine Download PDFInfo
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- CN110344975B CN110344975B CN201910689846.3A CN201910689846A CN110344975B CN 110344975 B CN110344975 B CN 110344975B CN 201910689846 A CN201910689846 A CN 201910689846A CN 110344975 B CN110344975 B CN 110344975B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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Abstract
The invention discloses a working method of a dual-fuel nozzle of an engine, which comprises the following specific steps: s1, firstly lifting the electromagnetic valve b, enabling the second fuel to enter a second fuel channel, discharging by the needle valve electrode, enabling the second fuel in the ionization space to form plasma under the action of an electric field, and lifting the needle valve electrode; s2, injecting the ionized high-activity second fuel into the engine combustion chamber through the jet hole, stopping supplying the second fuel, and starting supplying the first fuel; and S3, injecting a small amount of first fuel into the combustion chamber through the first fuel passage, the pressure chamber and the injection holes, igniting under the action of the pressure temperature in the cylinder of the engine, and igniting the second fuel injected into the combustion chamber. The application achieves the aims of improving atomization, improving combustion, reducing the emission level of harmful combustion products and expanding the ignition range.
Description
Technical Field
The invention relates to a working method of a dual-fuel nozzle of an engine.
Background
Increasingly stringent energy-saving and environmental requirements have become the biggest challenge in the field of engine research. With the continuous development of engine technology, the requirements of the engine on fuel for optimal economy, dynamic property and emission characteristic under different loads, different working conditions and the like are greatly different. Therefore, the conventional single fuel engine is gradually unable to meet the requirements of people in certain specific application occasions. In this trend, dual fuel engines have become a necessary choice.
Due to the fact that injection strategies of different fuels can be flexibly controlled according to specific working conditions so as to achieve good engine performance, the dual-fuel engine is gradually applied to the power fields of vehicles, ships and the like. In the existing dual-fuel technical route, the scheme that each fuel adopts a separate fuel supply and injection system has higher reliability, but the cost is high, the occupied space of the structural arrangement is larger, and the fuel can not be applied to certain engines needing compact structures; however, the dual-fuel injector has not become a mainstream solution in the industry due to the problems of complex structure, low reliability and the like.
The structure of the existing engine dual-fuel nozzle is as described in patent No. CN200520029399.2, the structure is very simple, and the existing engine dual-fuel nozzle generally comprises a nozzle body, a needle valve, a valve sleeve and an electromagnetic valve. During operation, the valve sleeve is lifted and the needle valve is seated to realize the injection of the fuel a, the needle valve is lifted and the valve sleeve is seated to realize the injection of the fuel b, the high-pressure fuel a and the electromagnetic valve control the lifting and seating of the valve sleeve, and the high-pressure fuel b and the electromagnetic valve control the lifting and seating of the needle valve. But the disadvantages are: (1) the conventional pressure atomization technology is adopted for the fuel a and the fuel b, so extremely high injection pressure is needed to obtain good atomization, which increases the cost and reduces the reliability; (2) pressure atomization does not change the reactivity of the fuel, so in some applications, increased ignition energy must be used to achieve better ignition and combustion performance.
Disclosure of Invention
The application provides a working method of the engine dual-fuel nozzle, which aims to solve the problems of poor atomization effect, high use cost, low reliability and the like of the existing engine dual-fuel nozzle.
In order to achieve the purpose, the technical scheme of the application is as follows: a method of operating an engine dual fuel nozzle comprising:
s1, firstly lifting the electromagnetic valve b, enabling the second fuel to enter a second fuel channel, discharging by the needle valve electrode, enabling the second fuel in the ionization space to form plasma under the action of an electric field, and lifting the needle valve electrode;
s2, injecting the ionized high-activity second fuel into the engine combustion chamber through the jet hole, stopping supplying the second fuel, and starting supplying the first fuel;
s3, a small amount of first fuel is injected into the combustion chamber through the first fuel channel, the pressure chamber and the injection holes, and the second fuel injected into the combustion chamber is ignited and ignited under the action of the pressure and the temperature in the engine cylinder;
the method is implemented in the dual-fuel nozzle, the dual-fuel nozzle comprises a nozzle body, an accommodating cavity is arranged in the nozzle body, a needle valve electrode, an insulating needle valve and a grounding electrode are arranged in the accommodating cavity, the needle valve electrode comprises an electrode table and an electrode rod which are connected, the electrode rod is positioned in the insulating needle valve, a gap between the electrode rod and the insulating needle valve is an ionization space, the grounding electrode wraps the periphery of the insulating needle valve, an insulating sleeve is arranged on the periphery of the electrode table, and the insulating sleeve is fixed on the upper portion of the nozzle body through a positioning pin; a first fuel channel is arranged on one side of the accommodating cavity, one end of the first fuel channel is connected with the bottom of the accommodating cavity, and the other end of the first fuel channel is connected with an electromagnetic valve a positioned at the top of the nozzle body; a second fuel channel is arranged on the other side of the accommodating cavity, one end of the second fuel channel is connected with the upper part of the accommodating cavity, the other end of the second fuel channel is connected with an electromagnetic valve b positioned at the top of the nozzle body, an electromagnetic valve c is arranged between the electromagnetic valve a and the electromagnetic valve b, and the electromagnetic valve c is connected with the top of the needle valve electrode; the bottom of the nozzle body is provided with a spray hole a and a spray hole b which are communicated with the outside, the bottom of the containing cavity is provided with a pressure chamber, and the spray hole a and the spray hole b are both connected with the pressure chamber; a lubricating hole is arranged between the first fuel channel and the containing cavity.
Further, the number of the lubricating holes is 3, the uppermost lubricating hole is used for introducing a small amount of fuel from the first fuel channel to a position between the needle valve electrode and the insulating sleeve, and the other two lubricating holes are used for introducing a small amount of fuel from the first fuel channel to a position between the outer side of the ground electrode and the accommodating cavity.
Furthermore, the needle valve electrode is made of a metal material, controls the opening and closing of the second fuel channel, and can also serve as a high-voltage electrode to realize dielectric barrier discharge between the needle valve electrode and the grounding electrode.
Furthermore, the insulating needle valve is made of an insulating material, controls the opening and closing of the first fuel channel, and can also serve as a medium layer for realizing medium barrier discharge between the needle valve electrode and the grounding electrode.
Further, the grounding electrode is made of a metal material, and the grounding electrode is used as a low-voltage electrode, so that dielectric barrier discharge between the needle valve electrode and the grounding electrode is realized.
Further, the solenoid valve a is used for controlling the fuel supply of the first fuel passage, the solenoid valve b is used for controlling the fuel supply of the second fuel passage, and the solenoid valve c is used for controlling the lift and seating of the needle valve electrode.
Furthermore, the insulating sleeve is used for realizing insulation between the needle valve electrode and the nozzle body.
Further, the first fuel passage and the second fuel passage are each provided obliquely in the nozzle body.
Due to the adoption of the technical scheme, the invention can obtain the following technical effects: the method adopts a dielectric barrier discharge excitation mode to ionize main fuel in the dual-fuel nozzle of the engine, can improve the distribution range of second fuel by utilizing the non-equilibrium plasma pneumatic effect, improves the reaction activity of spraying by utilizing the non-equilibrium plasma chemical effect, and finally achieves the purposes of improving atomization, improving combustion, reducing the emission level of harmful combustion products and expanding the ignition range. Meanwhile, when the needle valve electrode in the application is not electrified, the needle valve can be used as a common dual-fuel nozzle to work normally.
Drawings
FIG. 1 is a cross-sectional view of a dual fuel nozzle of an engine of the present application;
FIG. 2 is a schematic diagram of the natural gas injection and ionization process in the example;
FIG. 3 is a schematic diagram of a gasoline injection process in an embodiment;
fig. 4 is a schematic diagram of a control method in embodiment 2.
The sequence numbers in the figures illustrate: 1-nozzle body, 11-lubrication hole, 12-first fuel channel, 13-second fuel channel, 14-spray hole, 15-pressure chamber, 16-ionization space, 2-electromagnetic valve a, 3-electromagnetic valve c, 4-electromagnetic valve b, 5-positioning pin, 6-insulating sleeve, 7-needle valve electrode, 8-insulating needle valve and 9-grounding electrode.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples: the present application is further described by taking this as an example.
Example 1
As shown in fig. 1-3, the present embodiment provides a dual fuel nozzle for an engine, which includes a nozzle body, a solenoid valve, a positioning pin, an insulating sleeve, a needle valve electrode, an insulating needle valve, and a ground electrode; the nozzle body is a main structure and is used for bearing other parts and structures and realizing fuel injection, and a second fuel channel 13, a first fuel channel 12 and three lubricating holes 11 are processed on the nozzle body; the second fuel channel 13 is used for introducing natural gas, the first fuel channel is used for introducing gasoline, the uppermost lubricating hole 11 is used for introducing a small amount of gasoline from the first fuel channel 12 to a position between the needle valve electrode 7 and the insulating sleeve 6, and the lower two lubricating holes are used for introducing a small amount of gasoline from the first fuel channel to a position between the outer side of the ground electrode and the accommodating cavity, so that lubrication of the two is realized; the electromagnetic valves are three in total, wherein the electromagnetic valve a and the electromagnetic valve b are respectively used for controlling fuel supply of gasoline and natural gas, and the electromagnetic valve b is used for controlling lifting and seating of the needle valve electrode 7; the positioning pin 5 is used for positioning the nozzle body 1 and the insulating sleeve 6, so that the lubricating holes 11 between the nozzle body 1 and the insulating sleeve 6 are communicated; the insulating sleeve is used for realizing the insulation between the needle valve electrode 7 and the nozzle body 1; the needle valve electrode 7 is made of metal materials and has two functions, wherein the first function is to control the opening and closing of a second fuel passage, and the second function is to serve as a high-voltage electrode to realize dielectric barrier discharge between the needle valve electrode 7 and a grounding electrode 9; the insulating needle valve 8 is made of insulating materials and has two functions, wherein the first function is to control the opening and closing of a first fuel passage, and the second function is to serve as a medium layer for realizing medium barrier discharge between the needle valve electrode 7 and the grounding electrode 9; the grounding electrode 9 is made of metal materials, and the grounding electrode has the function of serving as a low-voltage electrode, so that dielectric barrier discharge between the needle valve electrode 7 and the grounding electrode 9 is realized.
Taking the first fuel as gasoline and the second fuel as natural gas as examples: when the natural gas injection valve works, the electromagnetic valve b is lifted firstly, natural gas enters the natural gas fuel channel 13, the needle valve electrode 7 discharges electricity immediately, the natural gas in the ionization space 16 forms plasma under the action of an electric field, at the moment, the needle valve electrode 7 is lifted, and the ionized high-activity natural gas is injected into an engine combustion chamber through the spray hole 14. Then, the natural gas stops supplying gas, the gasoline supply starts, a small amount of gasoline is sprayed into the combustion chamber through the gasoline fuel channel 12, the pressure chamber 15 and the spray hole 14, the gasoline is ignited under the action of the huge pressure and temperature in the engine cylinder, and the natural gas sprayed into the combustion chamber at the moment is ignited. Since the natural gas has been ionized into a plasma with a very high reactivity, it is very susceptible to ignition by gasoline and combustion begins.
If the needle valve electrode 7 is not electrified, the scheme can be used as a conventional gasoline-natural gas dual-fuel nozzle.
Example 2
The present embodiment takes the first fuel as gasoline and the second fuel as natural gas for further explanation: as shown in fig. 4, the present embodiment provides a method for controlling an engine dual-fuel nozzle operation method, which includes the following specific steps:
(1) in the nth cycle, the crankshaft position sensor judges the position of the crankshaft, and if the current crankshaft rotation angle is not equal to a set value, the judgment is continued; if the set value is reached, the ECU outputs a lift command to the solenoid valve b. This time is denoted as the time origin t.
(2) The electromagnetic valve b is lifted, and the natural gas enters a natural gas fuel channel through a fuel supply system pipeline.
(3) With the time origin t as a starting point, after a calibrated time interval of delta t1 (the time from the time origin t to the time when the natural gas is about to enter the ionization space 16 is counted by delta t 1), the ECU sends out an instruction, and the power supply supplies power to the needle valve electrode 7 at a higher voltage U (for example, 15-20 kV).
(4) Dielectric barrier discharge is started among the needle valve electrode 7, the insulating needle valve 8 and the grounding electrode 9 (at the moment, natural gas just fills the ionization space 16), and the natural gas in the ionization space 16 is ionized into non-equilibrium plasma with high reactivity.
(5) With t + Δ t1 as the time origin, after a calibrated Δ t2 time (Δ t2 is the time period from the beginning of discharge to the point at which the ionization space 16 is about to be filled with natural gas), the ECU issues a command and the solenoid valve c is raised.
(6) The needle valve electrode 7 is lifted under the action of the electromagnetic valve c, at the moment, the natural gas fuel channel 13, the ionization space 16, the pressure chamber 15, the spray holes 14 and the engine combustion chamber form a natural gas passage, and plasma generated by natural gas ionization is sprayed out of the spray holes 14 and enters the combustion chamber.
(7) And taking t + delta t1+ delta t2 as a time origin, and after a calibrated delta t3 time (the delta t3 is the time from the time origin of t + delta t1+ delta t2 to the injection of the natural gas with the flow rate required by the normal work of the engine under the working condition), sending a command by the ECU, closing the electromagnetic valve b, and stopping the supply of the natural gas.
(8) With t + Δ t1+ Δ t2+ Δ t3 as the time origin, after a calibrated Δ t4 time (Δ t4 is the time required from the closing of the electromagnetic valve 3 until all residual natural gas in the nozzle body is injected into the combustion chamber), the ECU sends a command, the electromagnetic valve c pushes the needle valve electrode 7 to be seated, and a natural gas passage formed by the natural gas fuel passage 13, the ionization space 16, the pressure chamber 15, the nozzle 14 and the engine combustion chamber is closed.
(9) With t + Δ t1+ Δ t2+ Δ t3+ Δ t4 as the time origin, after a calibrated Δ t5 time (Δ t5 is the time required for the natural gas to be distributed more uniformly in the engine combustion chamber, counted from the time when all the natural gas has been injected into the combustion chamber), the ECU issues an instruction to raise the solenoid valve a and allow the high-pressure gasoline to enter the gasoline fuel passage 12.
(10) The insulation needle valve 8 is lifted under the action of high-pressure gasoline, a gasoline fuel channel 12, a pressure chamber 15, a spray hole 14 and an engine combustion chamber form a passage, and the gasoline is sprayed out from the spray hole 14.
(11) The cylinder pressure sensor collects a cylinder pressure signal p and transmits the cylinder pressure signal p to the ECU. If p is more than or equal to p1(p1 is the average value of the pressure in the cylinder corresponding to the normal ignition of the engine in a plurality of cycles when the crankshaft is positioned at a certain specific position, and a certain margin is required), the ECU judges that the nozzle works normally and immediately enters the next cycle; if p < p1, the engine assumes that the nozzle is not operating properly and then at n +1 cycles the power supply will discharge at a voltage of U + Δ U1.
(12) The cylinder pressure sensor collects a cylinder pressure signal p and transmits the cylinder pressure signal p to the ECU. If p is more than or equal to p1(p1 is the average value of the pressure in the cylinder corresponding to the normal ignition of the engine in a plurality of cycles when the crankshaft is positioned at a certain specific position, and a certain margin is required), the ECU judges that the nozzle works normally and immediately enters the next cycle; if p < p1, the engine assumes that the nozzle is not operating properly and then at n +2 cycles the power supply will discharge at a voltage of U + Δ U2, Δ U2> Δ U1.
(13) The cylinder pressure sensor collects a cylinder pressure signal p and transmits the cylinder pressure signal p to the ECU. If p is more than or equal to p1(p1 is the average value of the pressure in the cylinder corresponding to the normal ignition of the engine in a plurality of cycles when the crankshaft is positioned at a certain specific position, and a certain margin is required), the ECU judges that the nozzle works normally and immediately enters the next cycle; if p < p1, the ECU terminates the power supply and outputs nozzle operation abnormality information.
The first and second fuel combinations in this application may be: gasoline-natural gas; gasoline-natural gas; methanol-natural gas; gasoline-methanol; gasoline-methanol; gasoline-ethanol; gasoline-ethanol; natural gas-ethanol; gasoline-dimethyl ether.
The protection scope of the present invention is not limited thereto, and any person skilled in the art should be able to substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (4)
1. A working method of a dual-fuel nozzle of an engine is characterized by comprising the following specific steps:
s1, firstly lifting the electromagnetic valve b, enabling the second fuel to enter a second fuel channel, discharging by the needle valve electrode, enabling the second fuel in the ionization space to form plasma under the action of an electric field, and lifting the needle valve electrode;
s2, injecting the ionized high-activity second fuel into the engine combustion chamber through the jet hole, stopping supplying the second fuel, and starting supplying the first fuel;
s3, a small amount of first fuel is injected into the combustion chamber through the first fuel channel, the pressure chamber and the injection holes, and the second fuel injected into the combustion chamber is ignited and ignited under the action of the pressure and the temperature in the engine cylinder;
the first fuel is gasoline, the first fuel channel is a gasoline fuel channel, the second fuel is natural gas, and the second fuel channel is a natural gas fuel channel;
the specific control method of the working method comprises the following steps:
(1) in the nth cycle, the crankshaft position sensor judges the position of the crankshaft, and if the current crankshaft rotation angle is not equal to a set value, the judgment is continued; if the set value is reached, the ECU outputs a lifting instruction to the electromagnetic valve b; recording as a time origin t at this time;
(2) lifting the electromagnetic valve b, and enabling natural gas to enter a natural gas fuel channel through a fuel supply system pipeline;
(3) taking a time origin t as an initial point, after a calibrated time interval of delta t1, calculating delta t1 from the time origin t to the time when natural gas is about to enter an ionization space, sending an instruction by an ECU, and supplying power to a needle valve electrode by a power supply at a higher voltage U;
(4) dielectric barrier discharge is started among the needle valve electrode, the insulating needle valve and the grounding electrode, and natural gas in the ionization space is ionized into non-equilibrium plasma with high reaction activity;
(5) taking t + delta t1 as a time origin, after a calibrated delta t2 time, enabling delta t2 to be the time from the beginning of discharging to the moment when natural gas is to fill an ionization space, and enabling the ECU to send an instruction and the electromagnetic valve c to be lifted;
(6) the needle valve electrode is lifted under the action of the electromagnetic valve c, at the moment, a natural gas fuel channel, an ionization space, a pressure chamber, a spray hole and an engine combustion chamber form a natural gas passage, and plasma generated by natural gas ionization is sprayed out of the spray hole and enters the combustion chamber;
(7) taking t + delta t1+ delta t2 as a time origin, after a calibrated delta t3 time, taking t + delta t1+ delta t2 as the time origin, and then finishing the injection of the natural gas with the flow required by the normal work of the engine, wherein the ECU sends an instruction, the electromagnetic valve b is closed, and the natural gas stops supplying gas;
(8) the method comprises the steps that t + delta t1+ delta t2+ delta t3 is used as a time origin, after a calibrated delta t4 time passes, delta t4 is the time required by all residual natural gas injected into a combustion chamber from the beginning of closing of an electromagnetic valve to the moment of injecting the residual natural gas into a nozzle body, an ECU sends an instruction, an electromagnetic valve c pushes a needle valve electrode to be seated, and a natural gas passage formed by a natural gas fuel channel, an ionization space, a pressure chamber, an injection hole and the combustion chamber of an engine is closed;
(9) recording t + delta t1+ delta t2+ delta t3+ delta t4 as a time origin, after the calibrated delta t5 time, calculating the time of all natural gas injected into a combustion chamber by delta t5, wherein the time is required for the natural gas to form uniform distribution in the combustion chamber of the engine, and sending an instruction by an ECU (electronic control unit), lifting an electromagnetic valve a, and enabling high-pressure gasoline to enter a gasoline fuel channel;
(10) the insulating needle valve is lifted under the action of high-pressure gasoline, a gasoline fuel channel, a pressure chamber, a spray hole and an engine combustion chamber form a passage, and the gasoline is sprayed out from the spray hole;
(11) a cylinder pressure sensor acquires a cylinder pressure signal p and transmits the cylinder pressure signal p to an ECU (electronic control unit); if p is more than or equal to p1, and p1 is the average value of the pressure in the cylinder corresponding to the normal ignition of the engine in a plurality of cycles when the crankshaft is positioned at a certain specific position, the ECU judges that the nozzle works normally and immediately enters the next cycle; if p < p1, the engine considers the nozzle not working normally, then at n +1 cycles, the power supply will discharge with a voltage of U + Δ U1;
(12) a cylinder pressure sensor acquires a cylinder pressure signal p and transmits the cylinder pressure signal p to an ECU (electronic control unit); if p is more than or equal to p1, and p1 is the average value of the pressure in the cylinder corresponding to the normal ignition of the engine in a plurality of cycles when the crankshaft is positioned at a certain specific position, the ECU judges that the nozzle works normally and immediately enters the next cycle; if p < p1, the engine considers the nozzle not working normally, then at n +2 cycles, the power supply will discharge with a voltage of U + Δ U2, Δ U2> Δ U1;
(13) a cylinder pressure sensor acquires a cylinder pressure signal p and transmits the cylinder pressure signal p to an ECU (electronic control unit); if p is more than or equal to p1, and p1 is the average value of the pressure in the cylinder corresponding to the normal ignition of the engine in a plurality of cycles when the crankshaft is positioned at a certain specific position, the ECU judges that the nozzle works normally and immediately enters the next cycle; if p < p1, the ECU terminates the power supply and outputs the abnormal nozzle operation information;
the control method is implemented in the dual-fuel nozzle, the dual-fuel nozzle comprises a nozzle body, an accommodating cavity is arranged in the nozzle body, a needle valve electrode, an insulating needle valve and a grounding electrode are arranged in the accommodating cavity, the needle valve electrode comprises an electrode table and an electrode rod which are connected, the electrode rod is positioned in the insulating needle valve, a gap between the electrode rod and the insulating needle valve is an ionization space, the grounding electrode wraps the periphery of the insulating needle valve, an insulating sleeve is arranged on the periphery of the electrode table, and the insulating sleeve is fixed on the upper portion of the nozzle body through a positioning pin; a first fuel channel is arranged on one side of the accommodating cavity, one end of the first fuel channel is connected with the bottom of the accommodating cavity, and the other end of the first fuel channel is connected with an electromagnetic valve a positioned at the top of the nozzle body; a second fuel channel is arranged on the other side of the accommodating cavity, one end of the second fuel channel is connected with the upper part of the accommodating cavity, the other end of the second fuel channel is connected with an electromagnetic valve b positioned at the top of the nozzle body, an electromagnetic valve c is arranged between the electromagnetic valve a and the electromagnetic valve b, and the electromagnetic valve c is connected with the top of the needle valve electrode; the bottom of the nozzle body is provided with a spray hole a and a spray hole b which are communicated with the outside, the bottom of the containing cavity is provided with a pressure chamber, and the spray hole a and the spray hole b are both connected with the pressure chamber; a lubricating hole is arranged between the first fuel channel and the accommodating cavity;
the number of the lubricating holes (11) is 3, the uppermost lubricating hole (11) is used for introducing fuel from the first fuel channel (12) to a position between the needle valve electrode (7) and the insulating sleeve (6), and the other two lubricating holes (11) are used for introducing fuel from the first fuel channel (12) to a position between the outer side of the grounding electrode (9) and the accommodating cavity;
the needle valve electrode (7) is made of a metal material, controls the opening and closing of the second fuel channel (13), and can also serve as a high-voltage electrode to realize dielectric barrier discharge between the needle valve electrode (7) and the grounding electrode (9);
the insulating needle valve (8) is made of insulating materials, controls the opening and closing of the first fuel channel (12), and can also serve as a medium layer for realizing medium barrier discharge between the needle valve electrode (7) and the grounding electrode (9);
the grounding electrode (9) is made of metal materials, and the grounding electrode has the function of acting as a low-voltage electrode, so that dielectric barrier discharge between the needle valve electrode (7) and the grounding electrode (9) is realized.
2. The engine dual fuel nozzle operating method as claimed in claim 1, characterized in that the solenoid valve a (2) is used for controlling the fuel supply of the first fuel passage, the solenoid valve b (4) is used for controlling the fuel supply of the second fuel passage, and the solenoid valve c (3) is used for controlling the lifting and seating of the needle valve electrode (7).
3. The engine dual fuel nozzle operating method as claimed in claim 1, characterized in that the insulating sleeve (6) is used to achieve insulation between the needle valve electrode (7) and the nozzle body (1).
4. The engine dual fuel nozzle working method as claimed in claim 1, characterized in that the bodies of the first fuel channel (12) and the second fuel channel (13) are obliquely arranged in the nozzle body (1).
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