A sliding arc plasma supported oil and gas cascade ignition and combustion facilitator

Abstract

The present application relates to a kind of sliding arc plasma supported oil and gas cascade ignition combustion exciter, belong to plasma ignition combustion field.The exciter includes primary component, gas inlet component and secondary component;Primary component includes shell cathode, inner cathode located in shell cathode, anode spaced in inner cathode and insulator located between anode and inner cathode, shell cathode is equipped with gas guide pipe, gas guide pipe is communicated between shell cathode and inner cathode, anode and inner cathode are equipped with and spaced gap communication, gas inlet component includes sliding arc precombustion cavity, its outside is equipped with fuel atomization cavity, and the fuel atomization cavity is formed between the two, shell cathode extends into sliding arc precombustion cavity, and sliding arc precombustion cavity and gap are communicated;Secondary component includes secondary cavity, and fuel atomization cavity is located in one end of secondary cavity.In the present application, the flow of fuel in oil and gas is adjusted to realize the switching of exciter between different working modes, so that the exciter can work normally in a wider equivalence ratio range.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of plasma ignition and combustion support, and specifically relates to a sliding arc plasma supported oil-gas cascade ignition and combustion support exciter. BACKGROUND

[0002] Reliable repeated ignition of a scramjet combustor under low Mach number conditions is a prerequisite for expanding the use range of a hypersonic aircraft. The commonly used ignition method is a pyrotechnic igniter, which has large energy and reliable ignition, but can only work for a short time and cannot be repeatedly ignited. Electric spark or pure plasma arc torch ignition is a commonly used repeated ignition method, which has rapid response, can produce high-activity chemical substances, and has a simple mechanical structure, but the released energy is linearly related to the volume of the power supply, which cannot meet the demand of practical repeated plasma ignition of a scramjet under larger flow conditions.

[0003] An air thermal jet igniter can be repeatedly used, but has a relatively large volume and a relatively narrow stable working equivalence ratio range, which is difficult to meet the on-board demand during flight. The igniter proposed in the invention patent application with the publication number CN113217196B "Cavity flame stabilizer self-bleed air sliding arc plasma jet igniter and ignition method" combines the advantages of a sliding arc plasma igniter and an air thermal jet igniter, but is limited by a smaller flow, which is difficult to meet the ignition energy demand of a larger flow combustor. It is necessary to further adjust and optimize the advantages of the sliding arc ignition device and the air thermal jet, and design a new type of ignition device. SUMMARY

[0004] We expect that the exciter can be quickly switched between different working modes by adjusting the fuel flow in the oil-gas, so that the exciter can normally work in a wider equivalence ratio range, realize cascade energy amplification from electric energy to reducing cracking components and high-temperature gas chemical energy, promote the evaporation and cracking of kerosene fuel, and improve the ignition and combustion performance of the engine.

[0005] The sliding arc plasma supported oil-gas cascade ignition and combustion support exciter provided by the application adopts the following technical scheme:

[0006] A sliding arc plasma supported oil-gas cascade ignition and combustion support exciter, comprising a primary component, an air inlet component and a secondary component;

[0007] The primary assembly comprises a hollow outer shell cathode, an inner cathode arranged in the outer shell cathode, an anode arranged in the inner cathode, and an insulator arranged between the anode and the inner cathode, one end of the outer shell cathode and one end of the inner cathode are connected, a gas guide pipe is arranged on the outer shell cathode, the gas guide pipe communicates with the space between the outer shell cathode and the inner cathode, a gap is arranged between the side wall of the anode and the inner side wall of the inner cathode, and the space and the gap are communicated.

[0008] The gas inlet assembly comprises a sliding arc pre-combustion cavity, an oil atomization cavity is arranged outside the sliding arc pre-combustion cavity, and an oil atomization cavity is formed between the two, a first gap is formed between the end of the sliding arc pre-combustion cavity away from the outer shell cathode and the end of the oil atomization cavity away from the outer shell cathode, the outer shell cathode extends into the sliding arc pre-combustion cavity, and the sliding arc pre-combustion cavity and the gap are communicated.

[0009] The secondary assembly comprises a secondary cavity, the oil atomization cavity is arranged in one end of the secondary cavity, a gas inlet pipe communicating with the oil atomization cavity is arranged on the outer wall of the secondary cavity, and a secondary oil injection pipe communicating with the oil atomization cavity is arranged on the oil atomization cavity.

[0010] By adopting the above technical scheme, the gas inlet pipe on the outer wall of the secondary cavity is used to introduce pure oxidant or air, a part of kerosene enters through the secondary oil injection pipe, the oxidant or air and the part of kerosene enter the oil atomization cavity, the oxidant or air promotes the atomization of the part of kerosene, and then the part of kerosene is injected into the secondary cavity through the first gap, and the gap plays a role in preventing backfire. The primary assembly (primary igniter) is arranged at the center of the secondary assembly (secondary igniter) of the ignition combustion exciter, and a mode of arranging the primary igniter at the center of the secondary igniter is formed. A small proportion of oil gas forms plasma and a small flow of hot jet through the primary assembly, and most of the oil gas enters the cavity surrounded by the secondary assembly. Under the support of the sliding arc plasma and the small flow of hot jet generated by the primary assembly, the secondary oil gas in the secondary cavity contacts the sliding arc plasma and the small flow of primary hot jet flame ejected by the primary assembly and is continuously ignited, forming a rotational flow flame working in cascade of the primary assembly and the secondary assembly, and realizing more stable rotational flow flame in the secondary cavity, and the device can also work normally in a wider equivalence ratio range.

[0011] When the equivalence ratio of the oil and gas input into the secondary component is close to one, the exciter works in the high-temperature ignition mode, the temperature of the rotational flow flame in the secondary cavity is the highest, and a large-flow high-temperature hot jet is formed at the outlet of the exciter, thereby realizing the high-temperature ignition function of the combustion chamber. When the equivalence ratio of the oil and gas input into the secondary component is greater than one, the exciter works in the high-activity combustion-supporting mode, the un-combusted fuel is cracked into a large number of reducing small molecular components by the rotational flow flame in the secondary cavity in the oxygen-free high-temperature environment, and the small molecular components and the hot jet injected into the combustion chamber can significantly promote the fuel atomization and evaporation in the combustion chamber, thereby shortening the ignition delay time in the combustion chamber and producing the combustion-supporting effect. Since the sliding arc plasma and the small-flow hot jet generated in the primary component always exist stably, the exciter can be quickly switched between different working modes by adjusting the fuel flow in the secondary oil and gas.

[0012] Optionally, the one end of the outer shell cathode is threadedly connected with the one end of the inner cathode, and the end face of the other end of the inner cathode abuts against the inner bottom wall of the other end of the outer shell cathode or the end face of the other end of the inner cathode has a spacing from the inner bottom wall of the other end of the outer shell cathode.

[0013] The outer wall of the sliding arc pre-combustion cavity is provided with a secondary oil and gas supplementing pipe in communication with the inside of the cavity.

[0014] By adopting the above technical scheme, the threaded end of the exposed inner cathode is rotated to abut the end face of the other end of the inner cathode against the inner bottom wall of the other end of the outer shell cathode, the primary igniter works in the pure gaseous mode, and the gas inlet pipe inputs pure gaseous oxidant (air or pure oxygen). The two ends of the inner cathode and the outer shell cathode are respectively connected to form an integrated type, air or pure oxygen enters the gap, and the sliding arc plasma generated by the breakdown of air at the two cathodes and the anode is blown out from the outer shell cathode into the sliding arc pre-combustion cavity. The kerosene enters the sliding arc pre-combustion cavity from the secondary oil and gas supplementing pipe, is ignited by contacting with the plasma and the oxidant, forms a diffusion pilot flame and enters the secondary cavity. The gas inlet pipe is used for inputting pure oxidant or air, a part of kerosene enters the secondary fuel jet pipe, and the oxidant or air and the part of kerosene all enter the fuel atomization cavity to promote the atomization of the part of kerosene, and the oil and gas mixture after atomization is sprayed into the secondary cavity through the first slit to contact with the diffusion pilot flame to form a rich flame and continue to burn in the secondary cavity.

[0015] When the end face of the other end of the inner cathode and the inner bottom wall of the other end of the outer shell cathode have a spacing, the primary igniter works in an oil-gas mixed mode. The air intake pipe is connected to an oil-gas mixture of air and kerosene, and the sliding arc plasma generated by the breakdown of the oil-gas mixture between the inner cathode and the anode directly ignites the remaining oil-gas mixture to spray out a flame from the gap, and another part of the oil-gas mixture flows from the spacing between the inner cathode and the outer shell cathode to the outlet of the outer shell cathode and is also ignited by the gap spray flame of the inner cathode, and then sprays out from the outlet of the primary assembly into the sliding arc precombustion chamber to form a rich premixed flame. The rich premixed flame meets the air injected by the secondary oil and gas supplement pipe, and the unburned fuel continues to burn to form a premixed service flame. The air intake pipe is used to introduce pure oxidant or air, and a part of the kerosene is introduced by the secondary fuel injection pipe. The oxidant or air and the part of the fuel are introduced into the fuel atomization chamber to promote the atomization of the part of the fuel. The oil-gas mixture after atomization is injected into the secondary chamber through the first slit and contacts the premixed service flame to form a rich flame and continues to burn in the secondary chamber.

[0016] Optionally, an annular cavity is formed between the fuel atomization chamber and the secondary chamber, and a plurality of small holes are formed on the fuel atomization chamber.

[0017] By adopting the above technical solution, the pure oxidant or air enters the annular cavity through the air intake pipe, and then enters the fuel atomization chamber through the small holes and is uniformly distributed, and contacts the kerosene entering the fuel atomization chamber, so that the kerosene is atomized more uniformly and completely.

[0018] Optionally, two fuel supplement pipes for supplementing cracked fuel are sequentially formed on the middle part of the secondary chamber along the length direction of the secondary chamber.

[0019] By adopting the above technical solution, the fuel supplement pipes are arranged on the secondary chamber, and the additional fuel can be cracked by the cracking effect of the high-temperature gas in the secondary chamber to produce more small-molecule fuel products, improve the combustion-supporting effect on the combustion chamber, and reduce the thermal ablation of the pipe wall. The fuel supplement pipes are arranged on the upstream and downstream of the secondary chamber respectively to spray the fuel, so as to adjust the cracking degree of the fuel. When the fuel is injected on the upstream, the fuel stays in the exciter for a long time, and the cracking degree is deep. When the fuel is injected on the downstream, the cracking degree is short.

[0020] Optionally, the cavity wall of the sliding arc precombustion chamber away from the outer shell cathode is tapered or tapered and expanding.

[0021] By adopting the above technical solution, when the air flow pressure is low, the sliding arc precombustion chamber can adopt a tapered pipe to ensure the stability of the outlet flow of the sliding arc precombustion chamber. When the air flow pressure is high, the sliding arc precombustion chamber can select a tapered and expanding pipe to improve the air flow mixing ability and combustion capacity in the secondary chamber.

[0022] Optionally, the secondary cavity is tapered or converging-diverging away from the cathode end of the outer shell.

[0023] By adopting the above technical solution, when the secondary cavity outlet end adopts a tapered pipeline, the temperature of the jet flow at the outlet of the exciter is high, which is suitable for use in ignition scenarios.

[0024] Optionally, the secondary cavity and the fuel atomization cavity are formed with a second slit away from the cathode end of the outer shell.

[0025] By adopting the above technical solution, the pure oxidant or air introduced by the inlet pipe flows into the secondary cavity through the second slit, forming a gas film on the wall of the secondary cavity, reducing the ablation of the wall of the secondary cavity, and further providing oxygen for the combustion of the rich flame entering the secondary cavity.

[0026] Optionally, the inner diameter of the secondary cavity is greater than the outer diameter of the cathode.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The exciter disclosed in the present application has two working modes. When the equivalence ratio of the oil and gas introduced into the secondary component is close to 1, the exciter works in a high-temperature ignition mode, the temperature of the rotational flow flame in the secondary cavity is the highest, a high-temperature hot jet flow with a large flow rate is formed at the outlet of the exciter, and the hot jet flow is ejected from the outlet of the exciter, thereby realizing the cascade energy amplification of the electrical energy of the primary component to the thermal energy of the high-temperature gas, and achieving the high-temperature ignition function of the combustion chamber.

[0029] When the equivalence ratio of the oil and gas introduced into the secondary component is greater than 1, the exciter works in a high-activity combustion-supporting mode, and the fuel that is not completely combusted passes through the rotational flow flame in the secondary cavity and is cracked into a large number of reducing small molecular components in the oxygen-free high-temperature environment. By adjusting the length of the secondary component and the equivalence ratio of the oil and gas entering the secondary cavity, the residence time of the secondary oil and gas in the cascade flame, the concentration and proportion of the cracked components, and the temperature of the cascade flame can be changed. After the small molecular gaseous components and the cascade flame gas jet with a relatively high temperature are injected into the combustion chamber, the evaporation of the fuel atomization in the combustion chamber can be significantly promoted, part of the fuel cracking process in the combustion chamber can be bypassed, and the ignition delay time in the combustion chamber can be shortened, thereby achieving the combustion-supporting effect, realizing the cascade energy amplification of the electrical energy of the primary component to the chemical energy of the high-temperature gas with high reducing cracking components, and achieving the high-activity combustion-supporting function of the combustion chamber. Since the sliding arc plasma and the small flow hot jet generated in the primary component always exist stably, the exciter can be quickly switched between different working modes by adjusting the fuel flow in the secondary oil and gas, and the exciter will not be extinguished.

[0030] 2, The application takes advantage of high activity of plasma and high chemical energy of fuel, and realizes cascade energy amplification from electric energy to reducing cracking components and chemical energy of high-temperature fuel gas through the combined action of sliding arc plasma generated by discharge and plasma-supported swirling flame, promotes evaporation and cracking of kerosene fuel, and improves ignition and combustion performance of the engine.

[0031] 3, The two-stage structure has larger gas and fuel flow, higher generated heat power and higher concentration of active components, and can achieve good ignition and combustion effect in a larger flow combustion chamber. Under the condition of outputting 100kW heat power, the 100kW arc igniter and the power supply have a huge volume, the current load is 263A when 380V power supply is used, and the cooling system is complex. However, the ignition and combustion exciter proposed in the application can normally work under the condition of outputting 100kW heat power, because the high-voltage power supply only needs to connect the smaller flow of the first-stage component, the smaller electric level gap can significantly reduce the power supply voltage and power, and can normally work under the condition of 1kW or even lower power supply input power, which reduces the requirements for insulation level, volume, weight and other parameters, and is conducive to the realization of engineering.

[0032] 4, In the traditional air thermal jet igniter, due to the heat absorption of fuel and the heat dissipation of wall surface, when deviating from the design condition, the thermal jet flame may appear unstable combustion or be close to extinction, and the equivalence ratio range of normal work is narrow. However, the sliding arc plasma and small flow thermal jet generated by the first-stage component of the invention can continuously support and stabilize the swirling flame in the second-stage component, maintain the normal work and rapid switching of different modes of the igniter. At the same time, the ignition and combustion exciter can use various fuels, including kerosene, gasoline, kerosene, ammonia, etc., and has wide fuel practicality. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the overall cross-sectional view of the oil and gas cascade ignition and combustion exciter supported by the sliding arc plasma embodying the application;

[0034] Figure 2 is a schematic view of the interval arrangement between the outlet end face of the inner cathode and the outlet end face of the shell cathode in the first-stage component embodying the application;

[0035] Figure 3 is a schematic view of the straight cylinder of the sliding arc pre-combustion cavity in the second-stage component embodying the application;

[0036] Figure 4 is a schematic view of the abutting arrangement between the outlet end face of the inner cathode and the outlet end face of the shell cathode in the first-stage component embodying the application;

[0037] Figure 5 is a schematic view of the tapered shape of the sliding arc pre-combustion cavity in the second-stage component embodying the application;

[0038] Figure 6 This is a schematic diagram illustrating that the sliding arc pre-combustion cavity in the secondary component of this application has a gradually contracting and expanding shape.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Bleed air pipe; 2. Intake pipe; 3. Secondary fuel injection pipe; 4. Secondary fuel replenishment and air replenishment pipe; 5. Fuel replenishment pipe;

[0041] 10. Primary component; 11. Outer cathode; 12. Inner cathode; 13. Anode; 14. Insulator;

[0042] 20. Intake assembly; 21. Sliding arc pre-combustion chamber; 22. Fuel atomizing chamber; 221. Fuel atomizing chamber; 211. First slit; 222. Orifice;

[0043] 30. Secondary component; 31. Secondary cavity; 311. Annular cavity; 312. Second slit. Detailed Implementation

[0044] The following will refer to the appendices in the embodiments of this application. Figures 1-6 The technical solutions in the embodiments of this application will be described.

[0045] This application discloses a sliding arc plasma-supported oil-gas cascade ignition and combustion actuator. The arrows in the figure indicate the airflow, hot jet, and flame direction.

[0046] Please see Figure 1 , Figure 2 and Figure 3 A sliding arc plasma-supported oil-gas cascade ignition and combustion actuator includes a primary component 10, an air intake component 20, and a secondary component 30 arranged sequentially along the length direction.

[0047] The primary component 10 includes a hollow outer cathode 11, an inner cathode 12 located within the outer cathode 11, an anode 13 located within the inner cathode 12, and an insulator 14 located between the anode 13 and the inner cathode 12.

[0048] One end of the outer cathode 11 is threadedly connected to one end of the inner cathode 12, and a gas inlet pipe 1 is provided on the end of the outer cathode 11. The other end of the outer cathode 11 has an end cap with a circular opening in the center. There is a gap between the outer wall of the inner cathode 12 and the inner wall of the outer cathode 11. The gas inlet pipe 1 connects the gap between the outer cathode 11 and the inner cathode 12.

[0049] The insulator 14 is located on the side of the anode 13 close to the air inlet pipe 1, and a gap is arranged between the side wall on the other side of the anode 13 and the inner wall of the inner cathode 12. A plurality of through holes are uniformly arranged on the inner cathode 12, so that the gap and the through holes are communicated. The end of the anode 13 away from the insulator 14 and the end cover of the inner cathode 12 close to the outer shell cathode 11 are spaced apart, and an opening is arranged on the inner cathode 12 opposite the circular opening of the end cover.

[0050] The air inlet assembly 20 comprises a hollow sliding arc pre-combustion cavity 21, and an oil atomization cavity 22 is arranged outside the sliding arc pre-combustion cavity. The sliding arc pre-combustion cavity 21 and the oil atomization cavity 22 form an oil atomization cavity 221 therebetween. The first gap 211 is formed between the end of the sliding arc pre-combustion cavity 21 away from the outer shell cathode 11 and the end of the oil atomization cavity 22 away from the outer shell cathode 11. The outer shell cathode 11 extends into the sliding arc pre-combustion cavity 21. The sliding arc pre-combustion cavity 21 is communicated with the circular opening on the end cover and the opening on the inner cathode 12.

[0051] The secondary assembly 30 comprises a secondary cavity 31, and the inner diameter of the secondary cavity 31 is significantly larger than the outer diameter of the outer shell cathode 11. The oil atomization cavity 22 is arranged in one end of the secondary cavity 31. The outer wall of the sliding arc pre-combustion cavity 21 is provided with a secondary oil and gas supplement pipe 4 communicated with the cavity inside the sliding arc pre-combustion cavity 21. The outer wall of the sliding arc pre-combustion cavity 21 can also be provided with a cavity in advance. The secondary oil and gas supplement pipe 4 is communicated with the cavity and passes through a plurality of uniformly distributed holes arranged on the cavity. The holes are communicated with the inside of the sliding arc pre-combustion cavity 21, so that the sliding arc pre-combustion cavity 21 can be uniformly supplemented with oil and gas.

[0052] The outer wall of the secondary cavity 31 is provided with an air inlet pipe 2 communicated with the oil atomization cavity 221. The oil atomization cavity 22 is provided with a secondary fuel injection pipe 3 communicated with the oil atomization cavity 221. The oil atomization cavity 22 and the secondary cavity 31 form an annular cavity 311. A plurality of small holes 222 are arranged on the oil atomization cavity 22. The oxidant or air entering from the air inlet pipe 2 enters the oil atomization cavity 221 through the small holes 222. Part of the kerosene enters through the secondary fuel injection pipe 3. The oxidant or air promotes the atomization of the part of the fuel, and then is injected into the secondary cavity 31 through the first gap 211.

[0053] The inner wall of the secondary cavity 31 and the end of the oil atomization cavity 22 away from the outer shell cathode 11 form a second gap 312. Pure oxidant or air entering from the air inlet pipe 2 flows into the secondary cavity 31 through the second gap 312, forms a gas film on the wall of the secondary cavity 31, reduces the ablation of the inner wall of the secondary cavity 31, and further provides oxygen for the rich combustion flame entering the secondary cavity 31.

[0054] The orifice 222 is not perpendicular to the inner surface of the fuel atomizing chamber 22, but rather forms an angle with the outlet normal direction, creating a swirling flow of air-fuel mixture under the constraint of the inner surface. When air enters the fuel atomizing chamber 221 from the intake pipe, its velocity increases, which can shear the fuel injected by the secondary fuel injector 3, thereby enhancing fuel atomization and evaporation, and accelerating the combustion and cracking process of fuel in the secondary component 30. The higher tangential intake swirling number results in a more stable swirling flame with a higher outlet temperature under the support of sliding arc plasma. It may also contain a higher content of small molecule fuels after cracking, leading to a shorter ignition delay time.

[0055] Rotate the inner cathode 12 to extend the threaded end of the outer cathode 11 so that the end of the inner cathode 12 facing the end cover is at a distance from the end cover, that is, the outlet end face of the inner cathode 12 and the outlet end face of the outer cathode 11 are not in contact. The first-stage igniter (first-stage component 10) works in the oil-air mixing mode, and the second-stage oil and air replenishment pipe 4 is used to replenish air.

[0056] The air intake pipe 1 introduces a mixture of air and kerosene. The sliding arc plasma generated by the breakdown of the oil-gas mixture by the inner cathode 12 and anode 13 directly ignites the remaining oil-gas mixture, ejecting flames from the gaps. Another portion of the oil-gas mixture flows from the gap between the inner cathode 12 and the outer cathode 11 towards the circular opening at the center of the end cap of the outer cathode 11. It encounters the flame ejected from the gap of the inner cathode 12 and is also ignited, both being ejected from the outer cathode 11 and entering the sliding arc pre-combustion chamber 21 to form a fuel-rich premixed flame. The fuel-rich premixed flame encounters the air injected by the secondary fuel replenishment pipe 4, and the unburned fuel continues to burn, forming a premixed standby flame. The intake pipe 2 is used to introduce pure oxidant or air. A portion of kerosene enters through the secondary fuel injection pipe 3. The oxidant or air and this portion of fuel both enter the fuel atomization chamber 221 to promote the atomization of this portion of fuel. The atomized fuel-air mixture is injected into the secondary chamber 31 through the first slit 211, and comes into contact with the premixed standby flame to form a fuel-rich flame, which continues to burn in the secondary chamber 31.

[0057] Two fuel replenishment pipes 5 are sequentially opened along the middle of the secondary chamber 31 for replenishing the cracked fuel. Fuel is injected into the secondary chamber 31 from both upstream and downstream locations to adjust the degree of fuel cracking. When injected upstream, the fuel has a longer residence time in the actuator, resulting in a deeper degree of cracking. When injected downstream, the degree of cracking is shorter.

[0058] Please refer to the following: Figure 4, the threaded end of the rotating inner cathode 12 extends out of the threaded end of the outer shell cathode 11, so that the inner cathode 12 is opposite to one end of the end cover and abuts against the end cover, that is, the outlet end surface of the inner cathode 12 abuts against the outlet end surface of the outer shell cathode 11, and the primary igniter (the primary assembly 10) works in a pure gaseous mode, the gas inlet pipe 1 is connected to pure gaseous oxidant (air or pure oxygen), and the secondary oil and gas supplement pipe 4 is used for supplementing kerosene.

[0059] The two ends of the inner cathode 12 and the outer shell cathode 11 are connected to form an integrated body, air or pure oxygen enters the interval from the gas inlet pipe 1, and then enters the gap, and the sliding arc plasma generated by the breakdown of air at the two cathodes and the anode is blown out from the outer shell cathode 11 into the sliding arc pre-combustion cavity 21, kerosene enters the sliding arc pre-combustion cavity 21 from the secondary oil and gas supplement pipe 4, contacts the plasma and the oxidant, and is ignited to form a diffusion pilot flame and enter the secondary cavity 31. The gas inlet pipe 2 is used for connecting pure oxidant or air, and a part of kerosene enters from the secondary fuel nozzle 3, and the oxidant or air and the part of kerosene enter the fuel atomization cavity to promote atomization of the part of kerosene, and the oil and gas mixture after atomization is sprayed into the secondary cavity 31 from the first slit 211 to contact the diffusion pilot flame to form a fuel-rich flame and continue to burn in the secondary cavity 31.

[0060] Please refer to Figure 5 and Figure 6 , the cavity wall of the sliding arc pre-combustion cavity 21 away from the outer shell cathode 11 is tapered or tapered and expanding. When the gas flow pressure is low, the sliding arc pre-combustion cavity 21 can adopt a tapered pipe to ensure stable flow rate at the outlet of the sliding arc pre-combustion cavity 21. When the gas flow pressure is high, the sliding arc pre-combustion cavity 21 can select a converging and expanding pipe to improve the gas flow mixing ability and combustion capacity in the secondary cavity 31.

[0061] The end of the secondary cavity 31 away from the outer shell cathode 11 is tapered or tapered and expanding. When the outlet end of the secondary cavity 31 adopts a tapered pipe, the outlet jet temperature of the exciter is high, which is suitable for ignition scenes. When the outlet end of the secondary cavity 31 adopts a tapered and expanding pipe, the outlet speed of the exciter is greater, which can penetrate to a deeper main flow position, and is suitable for long-time combustion support work.

[0062] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sliding arc plasma-supported oil-gas cascade ignition and combustion booster, characterized in that, It includes a primary component (10), an intake component (20), and a secondary component (30) arranged sequentially along the length direction; The primary component (10) includes a hollow outer cathode (11), an inner cathode (12) spaced apart in the outer cathode (11), an anode (13) located in the inner cathode (12), and an insulator (14) located between the anode (13) and the inner cathode (12). One end of the outer cathode (11) is connected to one end of the inner cathode (12). An air intake pipe (1) is provided on the outer cathode (11). The air intake pipe (1) connects the space between the outer cathode (11) and the inner cathode (12). A gap is provided between the side wall of the anode (13) and the inner side wall of the inner cathode (12). Multiple through holes are uniformly opened on the inner cathode (12). The space and the gap are connected. The intake assembly (20) includes a sliding arc pre-combustion chamber (21), and a fuel atomizing chamber (22) is sleeved on the outside of the sliding arc pre-combustion chamber (21), forming a fuel atomizing chamber (221) between the two. A first slit (211) is formed between the end of the sliding arc pre-combustion chamber (21) away from the outer cathode (11) and the end of the fuel atomizing chamber (22) away from the outer cathode (11). The outer cathode (11) extends into the sliding arc pre-combustion chamber (21), and the sliding arc pre-combustion chamber (21) communicates with the slit. The secondary component (30) includes a secondary cavity (31), the fuel atomizing cavity (22) is located inside one end of the secondary cavity (31), the outer wall of the secondary cavity (31) is provided with an air intake pipe (2) communicating with the fuel atomizing cavity (221), and the fuel atomizing cavity (22) is provided with a secondary fuel injection pipe (3) communicating with the fuel atomizing cavity (221). One end of the outer cathode (11) and one end of the inner cathode (12) are threadedly connected. The end face of the other end of the inner cathode (12) is pressed against the inner bottom wall of the other end of the outer cathode (11) or the end face of the other end of the inner cathode (12) is spaced from the inner bottom wall of the other end of the outer cathode (11). The outer wall of the sliding arc pre-combustion chamber (21) is provided with a secondary oil and gas replenishment pipe (4) that communicates with the interior of the chamber.

2. The sliding arc plasma-supported oil-gas cascade ignition and combustion actuator according to claim 1, characterized in that, An annular cavity (311) is formed between the fuel atomizing chamber (22) and the secondary cavity (31), and a plurality of small holes (222) are provided on the fuel atomizing chamber (22).

3. The sliding arc plasma-supported oil-gas cascade ignition and combustion actuator according to claim 2, characterized in that, The secondary cavity (31) has two fuel replenishment pipes (5) for replenishing pyrolysis fuel in sequence along its length.

4. The sliding arc plasma-supported oil-gas cascade ignition and combustion actuator according to claim 1, characterized in that, The cavity wall of the sliding arc pre-combustion cavity (21) away from the outer casing cathode (11) is either gradually narrowing or gradually expanding.

5. The sliding arc plasma-supported oil-gas cascade ignition and combustion actuator according to claim 1, characterized in that, The end of the secondary cavity (31) away from the outer cathode (11) is either tapered or tapered and expanded.

6. The sliding arc plasma-supported oil-gas cascade ignition and combustion actuator according to claim 1, characterized in that, The secondary cavity (31) and the fuel atomizing cavity (22) form a second slit (312) at the end away from the outer casing cathode (11).

7. The sliding arc plasma-supported oil-gas cascade ignition and combustion actuator according to claim 1, characterized in that, The inner diameter of the secondary cavity (31) is larger than the outer diameter of the outer cathode (11).

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