An airborne plasma fuel reforming nozzle and experimental device

Abstract

The present invention belongs to the technical field of engine plasma onboard fuel cracking and reforming, and specifically relates to an onboard plasma fuel reforming nozzle and an experimental device, comprising: a nozzle housing, a plasma generator is arranged in the nozzle housing, and the plasma generator is suitable for generating a plasma area in the nozzle housing; a nozzle opening is opened on one end surface of the nozzle housing, and air and fuel are suitable for entering the nozzle housing from the other end surface of the nozzle housing; air and fuel are suitable for mixing and starting atomization in the nozzle housing, and plasma pairs in the plasma area are mixed and start the cracking and reforming of the atomized fuel, and the cracked and reformed fuel is ejected from the nozzle opening; from the perspective of onboard cracking and reforming fuel, the atomization and mixing quality are enhanced by changing the physical and chemical properties of the fuel itself. Comprehensively considering the problems of cracking reaction quenching and freezing control, electrode cooling and preventing coking, a fuel multi-channel and gas multi-channel mixing method is designed.

Description

Technical Field

[0001] The invention belongs to the technical field of engine plasma onboard fuel cracking and reforming, and in particular relates to an onboard plasma fuel reforming nozzle and an experimental device. Background Art

[0002] With the deepening of engineering research, liquid fuel has a higher energy density and is easy to store, so engines using liquid fuel have always been a hot topic of research. One of the key technologies in the research is the spray atomization of liquid fuel, and the atomization quality directly controls the engine performance and stability. For example, in the application of aircraft engines or ramjet engines in high-altitude environments, flameout and re-ignition, detonation and ignition of detonation engines, etc., the atomization quality of liquid hydrocarbon fuels is extremely high. The fuel spray reaching the critical average droplet size is a necessary prerequisite for improving ignition performance and combustion efficiency. For example, in a high-speed airflow environment, such as the propagation of a detonation wave, the speed of the detonation wave passing through the droplets can reach 2000m / s. Since an extremely short detonation atomization evaporation time is required, if air is used as an oxidant, an ultra-fine atomization method (the average droplet diameter is less than 10μm) is generally required, but at this stage, conventional atomization methods are difficult to achieve the required atomization requirements.

[0003] However, in addition to upgrading the atomization method, the physical properties of the fuel itself can also be changed. The fuel chemical delay time mainly depends on the fuel physical properties. Shortening the ignition delay time can ensure the continuous and stable propagation of combustion. The combustion efficiency of small molecule gas hydrocarbon fuels is much higher than that of large molecule fuels. It is easier to mix with oxidants, shorten the ignition delay time, and the atomization process is relatively easy. However, if hydrogen and small molecule fuel gas are used directly as fuel, the pressure required to achieve an energy density equivalent to that of liquid fuel is extremely high. If the engine can carry high-energy-density large-molecule fuels and partially crack them into small-molecule light hydrocarbons and hydrogen before entering the combustion chamber, the characteristics of the fuel will be changed, which is conducive to ultra-fine atomization, thereby improving the performance of the combustion chamber of the internal combustion engine.

[0004] In recent years, plasma combustion has become a research frontier in the field of advanced combustion chambers. The thermal, chemical and transport effects of plasma can help the engine combustion chamber to achieve efficient cracking and ignition, lean combustion, flame retention and self-sustaining, flameless combustion, etc. The plasma cracking process can directly contact the fuel molecules for heat transfer cracking, avoiding the heat transfer resistance of the intermediate medium of thermal cracking and the promotion of the wall surface on the catalytic polymerization reaction of the fuel. The high-enthalpy particles generated by the plasma can be used to actively bombard the fuel molecules indiscriminately and break the bonds. These processes are the basis for promoting efficient cracking. Technically, the cracking reaction process can be controlled by multi-effect coupling, so that the fuel develops in the direction of cracking dominance, and the proportion and probability of coupled polymerization reactions are suppressed.

[0005] Therefore, based on the above technical problems, it is necessary to design a new airborne plasma fuel reforming nozzle and experimental device. Summary of the invention

[0006] The purpose of the present invention is to provide an airborne plasma fuel reforming nozzle and an experimental device.

[0007] In order to solve the above technical problems, the present invention provides an airborne plasma fuel reforming nozzle, comprising:

[0008] a nozzle housing, wherein a plasma generator is disposed in the nozzle housing, and wherein the plasma generator is adapted to generate a plasma region in the nozzle housing;

[0009] A nozzle opening is provided on one end surface of the nozzle housing, and air and fuel are suitable for entering the nozzle housing from the other end surface of the nozzle housing;

[0010] The nozzle opening comprises: a straight tube portion and a tapered portion;

[0011] The straight tube portion is connected to the tapered portion, one end of the straight tube portion is arranged on the end surface of the nozzle housing, and the other end is connected to the end of the tapered portion with a smaller cross-sectional area;

[0012] The end of the tapered portion having a larger cross-sectional area is arranged on the inner top surface of the nozzle housing;

[0013] The air and fuel are suitable for mixing and starting atomization in the nozzle housing, and the plasma in the plasma area mixes and starts the cracking and reforming of the atomized fuel, and the cracked and reformed fuel is ejected from the nozzle opening.

[0014] Further, the plasma generator comprises: a high voltage electrode and a plasma generator housing;

[0015] The plasma generator housing is disposed within the nozzle housing;

[0016] The high voltage electrode is arranged in the housing of the plasma generator;

[0017] One pole of the high voltage electrode close to the nozzle port extends out from the plasma generator housing;

[0018] The high voltage electrode is suitable for generating a plasma region.

[0019] Furthermore, the high-voltage electrode extends out of the plasma generator housing at one end and is arranged with a variable diameter, that is, the closer to the nozzle opening, the smaller the diameter.

[0020] Furthermore, the high voltage electrode jacket is provided with an inner cyclone;

[0021] The inner cyclone is arranged between the high voltage electrode and the inner wall of the plasma generator shell.

[0022] Furthermore, a sleeve is sleeved outside the plasma generator shell, and there is a gap between the inner wall of the sleeve and the outer wall of the plasma generator shell.

[0023] Furthermore, an outer cyclone is sleeved on the outer wall of the plasma generator housing, and the outer cyclone is arranged in the gap between the inner wall of the sleeve and the outer wall of the plasma generator housing;

[0024] The air passes through the inner cyclone and the outer cyclone;

[0025] The fuel passes between the outer wall of the sleeve and the inner wall of the nozzle housing.

[0026] Further, the central axis of the nozzle opening is at an angle a with the axis of the nozzle housing;

[0027] The central axis of the nozzle opening forms an angle b with the inner wall of the tapered portion.

[0028] On the other hand, the present invention also provides an experimental device using the above-mentioned airborne plasma fuel reforming nozzle, comprising:

[0029] Experimental pipe section, plasma nozzle replacement module, product sampling port, sensor communication port and flow stabilization device;

[0030] The plasma nozzle replacement module is installed on the bottom surface of the experimental pipe section, and an airborne plasma fuel reforming nozzle is arranged on the plasma nozzle replacement module, and the fuel sprayed by the airborne plasma fuel reforming nozzle enters the experimental pipe section;

[0031] The product sampling port is arranged on the top surface of the experimental pipe section;

[0032] The sensor communication port is arranged on the outer wall of the experimental pipe section;

[0033] The flow stabilizing device is arranged on the inner top surface of the experimental pipe section.

[0034] Furthermore, the lowest end of the flow stabilizing device is arranged closer to the air inlet of the experimental pipe section than the nozzle opening of the airborne plasma fuel reforming nozzle.

[0035] Furthermore, an optical window is provided on the outer wall of the experimental pipe section.

[0036] The beneficial effect of the present invention is that the present invention uses a nozzle housing, a plasma generator is arranged in the nozzle housing, and the plasma generator is suitable for generating a plasma area in the nozzle housing; a nozzle port is opened on one end surface of the nozzle housing, and air and fuel are suitable for entering the nozzle housing from the other end surface of the nozzle housing; the nozzle port includes: a straight barrel and a tapered portion; the straight barrel is connected to the tapered portion, one end of the straight barrel is arranged on the end surface of the nozzle housing, and the other end is connected to the end with a smaller cross-sectional area of ​​the tapered portion; the end with a larger cross-sectional area of ​​the tapered portion is arranged on the inner top surface of the nozzle housing; air and fuel are suitable for mixing and starting atomization in the nozzle housing, and the plasma in the plasma area mixes and starts the cracking and reforming of the atomized fuel, and the cracked and reformed fuel is ejected from the nozzle port; from the perspective of airborne cracking and reforming fuel, the atomization and mixing quality are enhanced by changing the physical and chemical properties of the fuel itself. Comprehensively considering the problems of cracking reaction quenching and freezing control, electrode cooling and preventing coking, a multi-channel fuel and gas multi-channel mixing method is designed. The fuel oil flows back and contacts the plasma to produce a violent cracking reaction, which is the main cracking reaction zone. The fuel oil is mixed and cooled, and the cracking process is quickly frozen to control the cracking process, inhibiting the coupling polymerization reaction after further cracking. The inner air passes through the inner cyclone as the plasma excitation medium gas, and the outer air passes through the outer cyclone to cool the electrode wall. The air film formed at the same time isolates the contact between the fuel oil and the hot electrode wall to prevent the electrode from coking. The relative movement between the rotating air and the fuel oil also plays a role in aerodynamic atomization of the fuel oil.

[0037] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a structural schematic diagram of an airborne plasma fuel reforming nozzle of the present invention;

[0041] Figure 2is a cross-sectional view of an airborne plasma fuel reforming nozzle of the present invention;

[0042] Figure 3 It is a schematic diagram of the structure of the experimental device of the present invention.

[0043] In the figure:

[0044] 1 is the product sampling port; 2 is the sensor communication port; 3 is the plasma nozzle replacement module; 4 is the optical window; 5 is the airborne plasma fuel reforming nozzle; 501 is the nozzle port; 502 is the nozzle shell; 503 is the high-voltage electrode; 504 is the plasma generator shell; 505 is the external swirler; 506 is the internal swirler; 507 is the sleeve; 6 is the flow stabilizing device; 7 is the experimental pipe section. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Example 1

[0047] As title 1 to Figure 3As shown, this embodiment 1 provides an airborne plasma fuel reforming nozzle 5, comprising: a nozzle housing 502, wherein a plasma generator is arranged in the nozzle housing 502, wherein the plasma generator is suitable for generating a plasma region in the nozzle housing 502; a nozzle opening 501 is provided on one end surface of the nozzle housing 502, and air and fuel are suitable for entering the nozzle housing 502 from the other end surface of the nozzle housing 502; the nozzle opening 501 comprises: a straight tube portion and a tapered portion; the straight tube portion is connected to the tapered portion, one end of the straight tube portion is arranged on the end surface of the nozzle housing 502, and the other end is connected to the end of the tapered portion with a smaller cross-sectional area; the end of the tapered portion with a larger cross-sectional area is arranged on the inner top surface of the nozzle housing 502; air and fuel are suitable for mixing and starting atomization in the nozzle housing 502, the plasma in the plasma region mixes and starts the cracking and reforming of the atomized fuel, and the cracked and reformed fuel is ejected from the nozzle opening 501; from the perspective of airborne cracking and reforming fuel, the atomization and mixing quality is enhanced by changing the physical and chemical properties of the fuel itself. Taking into account the quenching and freezing control of the cracking reaction, electrode cooling and the prevention of coking, a multi-channel fuel oil and multi-channel gas mixing method is designed. One channel of fuel oil refluxes and contacts with the plasma to produce a violent cracking reaction, which is the main cracking reaction zone, and the other channel is mixed and cooled to quickly freeze and control the cracking process, thereby inhibiting the coupling polymerization reaction after further cracking. The inner air passes through the inner cyclone 506 as the plasma excitation medium gas, and the outer air passes through the outer cyclone 505 to cool the electrode wall. At the same time, the air film formed isolates the contact between the fuel oil and the hot electrode wall to prevent electrode coking. The relative movement between the rotating air and the fuel oil also plays a role in aerodynamic atomization of the fuel oil.

[0048] In this embodiment, the airborne plasma fuel reforming nozzle 5 can be applied to applications such as flameout re-ignition of aircraft engines or ramjet engines in high-altitude environments, detonation ignition of detonation engines, etc. Liquid macromolecular hydrocarbon fuel has the characteristics of high energy density, easy storage and high stability, but in complex and harsh ignition environments, such as low temperature, lack of oxygen, high speed, etc., the ignition conditions are extremely harsh, and liquid fuel has the problems of difficult ignition and low efficiency.

[0049] In this embodiment, fuel and gas (such as air, etc.) are mixed in two ways: for the fuel flow path, one path of fuel is used as the hydrocarbon raw material of plasma, and the other path is used as the fuel mixing quenching flow path; for the gas flow path, one path is used as the excitation medium gas of plasma, and the other path is used as the gas source for the gas film to isolate the fuel and the hot electrode; the onboard plasma fuel reforming nozzle 5 takes into account the problems of cracking reaction quenching and freezing control, electrode cooling and coking, so that the plasma generator has the ability to significantly increase power and improve efficiency, and studies the various forms of bond breaking effects on fuel molecules through plasma thermal effects, chemical effects, and transport effects to improve cracking efficiency, and combines gas-liquid mixing and quenching to control the cracking process and inhibit hydrocarbon fuel coupling polymerization reactions.

[0050] In this embodiment, the plasma generator includes: a high-voltage electrode 503 and a plasma generator shell 504; the plasma generator shell 504 is arranged in the nozzle shell 502; the high-voltage electrode 503 is arranged in the plasma generator shell 504; one pole of the high-voltage electrode 503 close to the nozzle port 501 extends out of the plasma generator shell 504; the high-voltage electrode 503 is suitable for generating a plasma region.

[0051] In this embodiment, the high-voltage electrode 503 extends out of one pole of the plasma generator housing 504 and is arranged with a variable diameter, that is, the closer to the nozzle opening 501, the smaller the diameter; the annular cross-sectional area of ​​the flow path between the high-voltage electrode 503 and the plasma housing changes regularly, in order to generate a plasma region with a larger area and energy; the plasma generator housing 504 is grounded or connected to the other pole of the high-voltage electrode 503.

[0052] In this embodiment, the high-voltage electrode 503 is provided with an inner cyclone 506; the inner cyclone 506 is arranged between the high-voltage electrode 503 and the inner wall of the plasma generator housing 504; the gas passes through the inner cyclone 506 to generate a high-speed airflow, which is mixed with the fuel to achieve a pneumatic atomization effect; the plasma gas source passes through the inner cyclone 506 to generate a flow field with a certain rotation speed, and the blades of the inner cyclone 506 are made of insulating and high-temperature resistant materials.

[0053] In this embodiment, a sleeve 507 is sleeved outside the plasma generator housing 504 , and there is a gap between the inner wall of the sleeve 507 and the outer wall of the plasma generator housing 504 .

[0054] In this embodiment, an outer swirler 505 is sleeved on the outer wall of the plasma generator housing 504, and the outer swirler 505 is arranged in the gap between the inner wall of the sleeve 507 and the outer wall of the plasma generator housing 504; air passes through the inner swirler 506 and the outer swirler 505; the fuel passes between the outer wall of the sleeve 507 and the inner wall of the nozzle housing 502; one path of gas flows to the outer swirler 505 through the gas pipeline, and the gas flows to between the plasma generator housing 504 and the sleeve 507.

[0055] In this embodiment, the central axis of the nozzle opening 501 and the axis of the nozzle housing 502 form an angle a; the central axis of the nozzle opening 501 and the inner wall of the conical portion form an angle b; the quenching and mixing process of the fuel is completed before the nozzle opening 501 sprays the fuel; the centerline angle of the nozzle opening 501 is adjustable, and the central axis of the nozzle and the axis of the nozzle housing 502 form a certain angle a, so as to obtain the atomization performance of the fuel in the external flow field when spraying at different angles. The fuel flows to the nozzle opening 501 through the annular area between the nozzle housing 502 and the plasma generator, and the fuel generated by the swirling along the outflow edge of the nozzle housing 502 is mixed with the plasma. The flow rate and intensity of the swirling are controlled by the angle b and the total flow rate and pressure of the fuel. The role of the mainstream is to quench the swirling cracking fuel caused by the plasma, and finally all the fuel is sprayed out from the nozzle.

[0056] In this embodiment, the fuel flows between the inner wall of the nozzle housing 502 and the outer wall of the sleeve 507. One path of the fuel serves as a hydrocarbon raw material for plasma reforming. The fuel contacts the plasma main area through a reflux or diversion pipeline channel. The reflux can be generated by setting a blocking edge or an annular reflux pipe on the inner wall of the nozzle housing 502. Different reflux modes and intensities can be generated by installing different blocking edges or annular reflux pipes.

[0057] Example 2

[0058] On the basis of Example 1, this Example 2 also provides an experimental device using the airborne plasma fuel reforming nozzle 5 in Example 1, including: an experimental pipe section 7, a plasma nozzle replacement module 3, a product sampling port 1, a sensor communication port 2 and a flow stabilizing device 508; the plasma nozzle replacement module 3 is installed on the bottom surface of the experimental pipe section 7, and the plasma nozzle replacement module 3 is provided with an airborne plasma fuel reforming nozzle 5, and the fuel sprayed by the airborne plasma fuel reforming nozzle 5 enters the experimental pipe section 7; the product sampling port 1 is arranged on the top surface of the experimental pipe section 7; the sensor communication port 2 is arranged on the outer wall of the experimental pipe section 7, and different sensors can be connected through the sensor communication port 2 according to different implementation requirements to receive data detected by the sensors; the flow stabilizing device 508 is arranged on the top surface of the experimental pipe section 7.

[0059] In this embodiment, the inlet and outlet of the experimental pipe section 7 can be connected with devices such as a pressure container, a pipeline heater, a throttle valve, a nozzle, a rectifying section, a vacuum pump, a spray device, and a silencer tower according to the requirements of the experiment.

[0060] In this embodiment, the lowest end of the flow stabilizing device 508 is arranged closer to the air inlet of the experimental pipe section 7 than the nozzle opening 501 of the airborne plasma fuel reforming nozzle 5 .

[0061] In this embodiment, an optical window 4 is provided on the outer wall of the experimental pipe section 7 .

[0062] In this embodiment, the plasma nozzle replacement module 3 adopts a modular design and is fixed, compressed and sealed with the experimental pipe section 7 by small bolts; product sampling windows are arranged in different areas around the plasma nozzle replacement module 3, and the optical window 4 is installed in an appropriate position to facilitate the detection of the experimental pipe section 7 by optical equipment and the observation of the inside of the experimental pipe section 7 by naked eyes.

[0063] In this embodiment, the flow stabilizing device 508 is arranged in conjunction with the plasma nozzle replacement module 3, and the distance between the onboard plasma fuel reforming nozzle 5 and the flow stabilizing device 508 is adjusted by small bolt threads and sealing copper pads of different thicknesses. If a semi-Rafale nozzle is used after the isolation section, the distance between the throat position and the center axis of the nozzle is d, and the parameters c and d are controllable variables; the flow stabilizing device 508 can produce subsonic, transonic, and supersonic airflow environments in the nozzle outlet environment according to different experimental requirements and in conjunction with the incoming air intake conditions, and can also produce environments with different static pressures in conjunction with the outlet back pressure conditions.

[0064] In summary, the present invention uses a nozzle housing 502, in which a plasma generator is arranged, and the plasma generator is suitable for generating a plasma area in the nozzle housing 502; a nozzle opening 501 is opened on one end surface of the nozzle housing 502, and air and fuel are suitable for entering the nozzle housing 502 from the other end surface of the nozzle housing 502; the nozzle opening 501 includes: a straight cylinder part and a tapered part; the straight cylinder part is connected to the tapered part, one end of the straight cylinder part is arranged on the end surface of the nozzle housing 502, and the other end is connected to the end of the tapered part with a smaller cross-sectional area; the end of the tapered part with a larger cross-sectional area is arranged on the inner top surface of the nozzle housing 502; air and fuel are suitable for mixing and starting atomization in the nozzle housing 502, the plasma in the plasma area mixes and starts the cracking and reforming of the atomized fuel, and the cracked and reformed fuel is ejected from the nozzle opening 501; from the perspective of onboard cracking and reforming fuel, the atomization and mixing quality are enhanced by changing the physical and chemical properties of the fuel itself. Taking into account the quenching and freezing control of the cracking reaction, electrode cooling and the prevention of coking, a multi-channel fuel oil and multi-channel gas mixing method is designed. One channel of fuel oil refluxes and contacts with the plasma to produce a violent cracking reaction, which is the main cracking reaction zone, and the other channel is mixed and cooled to quickly freeze and control the cracking process, thereby inhibiting the coupling polymerization reaction after further cracking. The inner air passes through the inner cyclone 506 as the plasma excitation medium gas, and the outer air passes through the outer cyclone 505 to cool the electrode wall. At the same time, the air film formed isolates the contact between the fuel oil and the hot electrode wall to prevent electrode coking. The relative movement between the rotating air and the fuel oil also plays a role in aerodynamic atomization of the fuel oil.

[0065] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0066] In the description of the embodiments of the present invention, 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0068] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0069] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0071] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An airborne plasma fuel reforming nozzle, It is characterized in that include: a nozzle housing, wherein a plasma generator is disposed in the nozzle housing, and wherein the plasma generator is adapted to generate a plasma region in the nozzle housing; A nozzle opening is provided on one end surface of the nozzle housing, and air and fuel are suitable for entering the nozzle housing from the other end surface of the nozzle housing; The nozzle opening comprises: a straight tube portion and a tapered portion; The straight tube portion is connected to the tapered portion, one end of the straight tube portion is arranged on the end surface of the nozzle housing, and the other end is connected to the end of the tapered portion with a smaller cross-sectional area; The end of the tapered portion having a larger cross-sectional area is arranged on the inner top surface of the nozzle housing; The air and the fuel are suitable for mixing and atomizing in the nozzle housing, the plasma in the plasma region mixes and starts the cracking and reforming of the atomized fuel, and the cracked and reformed fuel is ejected from the nozzle opening; The plasma generator comprises: a high voltage electrode and a plasma generator housing; The plasma generator housing is disposed within the nozzle housing; The high voltage electrode is arranged in the housing of the plasma generator; One pole of the high voltage electrode close to the nozzle port extends out from the plasma generator housing; The high voltage electrode is suitable for generating a plasma region; The high-voltage electrode extends out of the plasma generator housing at one end and is arranged with a variable diameter, that is, the closer to the nozzle opening, the smaller the diameter; The high voltage electrode jacket is provided with an inner cyclone; The inner cyclone is arranged between the high voltage electrode and the inner wall of the plasma generator shell.

2. The airborne plasma fuel reforming nozzle according to claim 1, Features: A sleeve is sleeved outside the plasma generator shell, and there is a gap between the inner wall of the sleeve and the outer wall of the plasma generator shell.

3. The airborne plasma fuel reforming nozzle according to claim 2, Features: An external cyclone is sleeved on the outer wall of the plasma generator housing, and the external cyclone is arranged in the interval between the inner wall of the sleeve and the outer wall of the plasma generator housing; The air passes through the inner cyclone and the outer cyclone; The fuel passes between the outer wall of the sleeve and the inner wall of the nozzle housing.

4. The airborne plasma fuel reforming nozzle according to claim 3, Features: The central axis of the nozzle opening forms an angle a with the axis of the nozzle housing; The central axis of the nozzle opening forms an angle b with the inner wall of the tapered portion.

5. An experimental device using the airborne plasma fuel reforming nozzle as claimed in claim 1, It is characterized in that include: Experimental pipe section, plasma nozzle replacement module, product sampling port, sensor communication port and flow stabilization device; The plasma nozzle replacement module is installed on the bottom surface of the experimental pipe section, and an airborne plasma fuel reforming nozzle is arranged on the plasma nozzle replacement module, and the fuel sprayed by the airborne plasma fuel reforming nozzle enters the experimental pipe section; The product sampling port is arranged on the top surface of the experimental pipe section; The sensor communication port is arranged on the outer wall of the experimental pipe section; The flow stabilizing device is arranged on the inner top surface of the experimental pipe section.

6. The experimental device as claimed in claim 5, Features: The lowest end of the flow stabilizing device is arranged closer to the air inlet of the experimental pipe section than the nozzle opening of the airborne plasma fuel reforming nozzle.

7. The experimental device as claimed in claim 6, Features: An optical window is arranged on the outer wall of the experimental pipe section.

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