A plasma-integrated ignition and combustion-supporting nozzle for a multi-stage swirl combustion chamber

Abstract

A plasma-integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber comprises, from the inside out, a nozzle, a primary swirler, a secondary swirler, a flare, and a sleeve. A venturi tube exists between the primary and secondary swirlers. The sleeve includes a metal sleeve and an insulating sleeve, introducing current into the flare. An insulating section exists between the flare and the secondary swirler, causing the air between the flare and the outer edge of the venturi tube to be broken down, forming a three-dimensional rotating sliding arc under the impingement of the primary and secondary swirling air. This invention can replace the existing atomizer in situ and be installed at the head of an aero-engine combustion chamber. It has a large discharge area, ensuring full contact with the atomized fuel, and effectively promoting ignition and combustion in the aero-engine combustion chamber.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular to a plasma-integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber. Background Technology

[0002] In the field of ignition and combustion, problems with ignition failure include: increased air intake at the combustion chamber head leading to increased incoming air velocity and turbulence intensity; difficulty in accumulating ignition energy in the combustion chamber; poor fuel-air mixing; and slow flame propagation speed. Ensuring stable ignition in the combustion chamber and expanding the engine's stable operating boundary has become a top priority in the development of aero-engines.

[0003] Non-equilibrium plasma carries a large number of high-energy electrons and active free radicals, releasing a significant amount of Joule heat while also significantly increasing the chemical reaction rate by expanding reaction pathways, thus greatly enhancing combustion and improving ignition performance. Among various discharge methods that generate non-equilibrium plasma, the three-dimensional rotating sliding arc has attracted widespread attention in the field of ignition and combustion assistance due to its advantages such as simple structure, resistance to electrode ablation, high proportion of non-equilibrium phase time, and strong chemical reaction kinetics.

[0004] Since aero-engine main combustion chambers generally employ swirlers to form a recirculation zone at the flame tube head, providing a stable ignition and combustion area, coupling three-dimensional rotating sliding arc technology with the flame tube head allows for the construction of a three-dimensional rotating sliding arc plasma using incoming swirling flow. For example, patent CN116951473A discloses a plasma ignition and combustion-supporting head excited by a central sliding arc discharge. Plasma discharge is achieved through the inner ring of the combustion head mounting base and a high-voltage electrode. A rotating sliding arc is formed by air passing through a first-stage swirler, and the incoming air propels the arc downstream. The arc is positioned at the optimal ignition and combustion-supporting location within the combustion chamber, facilitating plasma-excited ignition and combustion. Patent CN116906933A discloses a small aero-engine sliding arc plasma ignition and combustion-supporting head. Breakdown discharge occurs between the electrode ring and the grounding nozzle, forming a sliding arc under the action of an axial swirling orifice. Its designed discharge components are simple in structure, easy to replace, and can directly replace the existing aero-engine combustion chamber head. In existing technologies that couple the sliding arc to the combustion chamber head, the three-dimensional rotating sliding arc is often located near the centrifugal nozzle of the pre-combustion stage. The arc is subject to compression from the recirculating air in the central recirculation zone, hindering its development and resulting in a small effective area. Consequently, the arc's impact on the fuel is low, leading to poor ignition and combustion efficiency. Furthermore, advanced aero-engine combustion chamber pre-combustion stages often employ combined air atomizing nozzles, with the nozzle's axial position far from the combustion chamber head end face. The sliding arc is affected by the swirling airflow from the central vortex, making it easily extinguished and limiting its sliding range. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to propose a plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirl combustion chamber. It adopts a compact design, has little interference with the swirl channel structure, and has the advantages of a large three-dimensional arc sliding area, deep plasma penetration into the fuel atomization area, strong fuel-gas activation effect, and good ignition and combustion-supporting effect.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A plasma-integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber includes a metal sleeve, an insulating sleeve, and a flared nozzle coaxially mounted along the fuel flow direction. One end of the metal sleeve is connected to one end of the insulating sleeve, and the constricted portion of the flared nozzle extends into the insulating sleeve, with its outer side connected to the inner wall of the insulating sleeve. An axial channel is formed at the center of the metal sleeve, the insulating sleeve, and the flared nozzle. A pre-combustion stage centrifugal nozzle and a multi-stage swirler are sequentially arranged along the fuel flow direction in the axial channel, and the multi-stage swirler is grounded. The horn-shaped opening is made of a conductive material, and a ring-shaped battery core is embedded in the insulating sleeve. The ring-shaped battery core is connected to the plasma power source through a high-voltage wire and is connected to the outside of the horn-shaped opening through a high-voltage electrode needle core, so that the horn-shaped opening becomes a high-voltage electrode.

[0007] The multi-stage cyclone separator is composed of a primary cyclone separator and a secondary cyclone separator coaxially welded together. The pre-combustion stage centrifugal nozzle is installed at the inlet end of the primary cyclone separator. The base center of the secondary cyclone separator extends along the fuel flow direction and passes over the cyclone vanes, thereby forming a venturi tube, which is grounded.

[0008] The constricted portion of the horn is connected to the outlet end of the multi-stage cyclone separator via an isolation section. The isolation section is an axially hollow insulating rotating body with an axial length of 4-6 mm to prevent breakdown air discharge between the horn and the multi-stage cyclone separator.

[0009] The insulating sleeve includes an insulating sleeve base with a high-voltage conductor channel on the base step. An insulating layer socket is provided on the outside of the insulating sleeve base, and the high-voltage conductor channel is connected to the insulating layer socket. A ring-shaped battery core and an insulating sleeve cover are fitted on the insulating sleeve base, and the insulating sleeve cover and the insulating sleeve base form a closed space. The ring-shaped battery core is connected to the high-voltage conductor by welding, and passes through the high-voltage conductor channel to be connected to the plasma power source. The high-voltage conductor is covered with an insulating sleeve, and the end of the insulating sleeve is inserted into the insulating layer socket. A high-voltage electrode hole is provided on the insulating sleeve cover, and a high-voltage electrode needle is inserted into the high-voltage electrode hole. The high-voltage electrode needle presses against the ring-shaped battery core to ensure that the high-voltage conductor, the ring-shaped battery core, and the high-voltage electrode needle are conductive.

[0010] The insulation layer has a socket depth of 2-4 mm and a diameter of 2-4 mm.

[0011] The diameter of the high-voltage conductor is 1-1.5 mm.

[0012] The flared opening includes stepped limiting blocks evenly distributed at equal intervals along the circumference. The stepped limiting blocks are radially protruding, so that the flared opening and the insulating sleeve are interference-fitted and tightly attached to the high-voltage electrode hole. The stepped limiting blocks completely cover the high-voltage electrode hole in the circumference. The outward extension of the flared opening is tightly attached to the insulating sleeve cover plate of the insulating sleeve through the step. The bottom of the flared opening is tightly connected to the isolation section through the inner ring groove.

[0013] The thickness of the step limiting block is 1-2mm, and the number is 6-10.

[0014] The isolation section includes an outer ring groove, which is fitted with an inner ring groove at the flared opening.

[0015] The connection between the lower end of the isolation section and the secondary cyclone separator, as well as the connection between the upper end of the isolation section and the inner ring groove, are all secured by ceramic-metal brazing.

[0016] Both the primary and secondary hydrocyclones are radial hydrocyclones with a blade angle of 40-60°. The axial length of the primary hydrocyclone is 8-15 mm, and the axial length of the secondary hydrocyclone is 12-20 mm.

[0017] The axial length of the venturi tube is 10-15 mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses an insulating sleeve with a built-in battery core to guide the high-voltage electricity output from the plasma power supply into the structure; the specialized insulation design minimizes the risk of electric flashover while avoiding a bulky insulation structure; due to the reduced insulation structure and conductive path design, the nozzle structure will not be interfered with, thereby improving the uniformity of airflow.

[0019] 2. In this invention, the Venturi tube is connected to the outer shell and grounded, and the flared end is connected to high voltage to become a high voltage electrode. The air at the minimum distance between the flared end and the Venturi tube is broken down to form a current channel. Under the action of swirling air, a three-dimensional rotating sliding arc is formed. The arc is driven by airflow and has a good effect, with a larger range of action.

[0020] 3. The three-dimensional rotating sliding arc of the present invention is located between the venturi tube and the bell mouth, with a large area of ​​sliding arc action area. At this point, the fuel is fully atomized by the venturi tube, and the fuel particle size is small, which can fully contact the arc and play a better role in ignition and combustion.

[0021] In summary, this invention can replace the original atomizer in situ and install it at the head of the aero-engine combustion chamber. It adopts an integrated and compact design, which minimizes interference with the cyclone flow channel structure, has a large three-dimensional sliding area of ​​the electric arc, and allows the plasma to penetrate deep into the fuel atomization area, resulting in a strong activation effect on the fuel gas and oil, and thus plays a good role in promoting ignition and combustion in the aero-engine combustion chamber. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the discharge effect of the present invention.

[0024] Figure 3 This is a cross-sectional view of the insulating sleeve of the present invention.

[0025] Figure 4 This is a cross-sectional view of the insulating sleeve base of the present invention.

[0026] Figure 5 This is a schematic diagram of the isolation section of the present invention.

[0027] Figure 6 This is a cross-sectional view of the flared mouth of the present invention.

[0028] Figure 7 This is a cross-sectional view of the conductive location in this invention.

[0029] Figure 8 It demonstrates the circumferential motion pattern of the sliding electric arc.

[0030] Figure 9 This image shows a comparison of the arc rotation effects of the present invention and existing technologies.

[0031] In the diagram, 1: metal sleeve; 2: insulating sleeve; 21: insulating sleeve base; 211: high-voltage conductor channel; 212: insulating layer socket; 22: ring-shaped battery cell; 23: insulating sleeve cover plate; 24: high-voltage electrode needle core; 25: high-voltage electrode hole; 26: insulating sleeve; 27: high-voltage conductor; 3: bell mouth; 31: stepped limiting block; 32: step; 33: inner ring groove; 4: pre-combustion stage centrifugal nozzle; 5: first-stage cyclone separator; 6: second-stage cyclone separator; 7: venturi tube; 8: isolation section; 81: outer ring groove of isolation section. Detailed Implementation

[0032] The invention will now be described in detail with reference to the accompanying drawings.

[0033] Reference Figure 1A plasma-integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber includes a metal sleeve 1, an insulating sleeve 2, and a bell mouth 3 coaxially mounted along the fuel flow direction. One end of the metal sleeve 1 is connected to one end of the insulating sleeve 2. The constricted portion of the bell mouth 3 extends into the insulating sleeve 2, and its outer side is connected to the inner wall of the insulating sleeve 2. An axial channel is formed at the center of the metal sleeve 1, the insulating sleeve 2, and the bell mouth 3. A pre-combustion stage centrifugal nozzle 4 and a multi-stage swirler are sequentially arranged along the fuel flow direction in the axial channel. The multi-stage swirler is grounded. The horn-shaped opening 3 is made of a conductor material. An annular battery core 22 is embedded in the insulating sleeve 2. The annular battery core 22 is connected to the plasma power source through a high-voltage wire 27 and is connected to the outside of the horn-shaped opening 3 through a high-voltage electrode needle core 24, so that the horn-shaped opening 3 becomes a high-voltage electrode.

[0034] The multi-stage cyclone separator is composed of a first-stage cyclone separator 5 and a second-stage cyclone separator 6, which are coaxially welded together. The pre-combustion stage centrifugal nozzle 4 is installed at the inlet end of the first-stage cyclone separator 5. The base center of the second-stage cyclone separator 6 extends along the fuel flow direction and passes over the cyclone vanes, thereby forming a venturi tube 7, which is grounded.

[0035] The constricted portion of the horn-shaped opening 3 is connected to the outlet end of the multi-stage cyclone separator via an isolation section 8. The isolation section 8 is an axially hollow insulating rotating body installed on the secondary cyclone separator 6, with an axial length of 4-6 mm, to prevent breakdown air discharge between the horn-shaped opening 3 and the multi-stage cyclone separator.

[0036] The metal sleeve 1 and the insulating sleeve 2 are connected by ceramic-metal brazing.

[0037] Reference Figure 3 , Figure 4 The insulating sleeve 2 includes an insulating sleeve base 21, on which a ring-shaped battery core 22 and an insulating sleeve cover plate 23 are fitted. The insulating sleeve cover plate 23 encloses the ring-shaped battery core 22 inside the insulating sleeve 2, preventing it from contacting the external environment and achieving insulation. The insulating sleeve base 21 is provided with a high-voltage conductor channel 211 and an insulating layer socket 212. The high-voltage conductor channel 211 is connected to the insulating layer socket 212. One end of the high-voltage conductor 27 is introduced into the insulating sleeve 2 through the high-voltage conductor channel 211 and connected to the ring-shaped battery core 22 by welding. The other end of the high-voltage conductor 27 is connected to a plasma power source. An insulating sleeve 26 is inserted into the insulating layer socket 212. The insulating sleeve 26 covers the outside of the high-voltage conductor 27 to prevent creepage risk at the interface due to the exposed high-voltage conductor 27, ensuring reliable insulation.

[0038] The insulating sleeve cover plate 23 has a high-voltage electrode hole 25, into which a high-voltage electrode needle core 24 is inserted. The high-voltage electrode needle core 24 is connected to the annular battery core 22, ensuring that the high-voltage conductor 27, the annular battery core 22, and the high-voltage electrode needle core 24 are conductive. The high-voltage current is introduced into the flared mouth 3 along the high-voltage conductor 27, the annular battery core 22, and the high-voltage electrode needle core 24, ensuring a continuous path without any loose connections and low current loss. The insulating sleeve 2 has an axial length of 8-14 mm, an inner diameter of 16-26 mm, and a thickness of 3-5 mm. The insulating sleeve 2 is made of a high-temperature resistant and high-dielectric-strength insulating material; specifically, in this embodiment of the invention, a dense alumina ceramic material is used.

[0039] The insulating layer socket 212 has a depth of 2-4 mm and a diameter of 2-4 mm.

[0040] The high-voltage conductor is made of a conductive metal material that is resistant to high temperature, has high conductivity, and has certain ductility and flexibility. The diameter of the high-voltage conductor 27 is 1-1.5mm. The outer insulation layer of the high-voltage cable is covered with a ceramic tube. The end of the insulation layer is inserted into the insulation layer socket 212. The insulation layer is fixed with high-temperature inorganic glue to prevent slippage, thereby ensuring the outer edge insulation.

[0041] Reference Figure 6 , Figure 7 The flared mouth 3 is made of nickel-based high-temperature alloy and includes stepped limiting blocks 31 evenly distributed at equal intervals along the circumference. The stepped limiting blocks 31 are radially protruding, with a thickness of 1-2 mm and a number of 6-10. The stepped limiting blocks 31 make the flared mouth 3 interference fit with the insulating sleeve 2 and tightly fit with the high-voltage electrode hole 25. The stepped limiting blocks 31 completely cover the high-voltage electrode hole 25 in the circumferential direction to ensure that the high voltage is introduced and conducted to the flared mouth 3 in sequence through the plasma power supply, the high-voltage wire 27, the ring core 22 and the high-voltage electrode needle core 24, making the flared mouth 3 a high-voltage electrode. The outward extension of the flared mouth 3 is tightly fitted with the insulating sleeve cover plate 23 of the insulating sleeve 2 through the step 32. The bottom of the flared mouth 3 is tightly connected to the isolation section 8 through the inner ring groove 33.

[0042] Both the primary hydrocyclone 5 and the secondary hydrocyclone 6 are radial hydrocyclones with a cyclone blade angle of 40-60°. The axial length of the primary hydrocyclone 5 is 8-15 mm, and the axial length of the secondary hydrocyclone 6 is 12-20 mm.

[0043] The axial length of the Venturi tube 7 is 10-15 mm.

[0044] Reference Figure 5 , Figure 6The isolation section 8 is an insulating rotating body made of alumina ceramic or polytetrafluoroethylene. Specifically, it is made of alumina ceramic using photopolymerization 3D ceramic printing technology. The axial length of the isolation section 8 is 4-6mm, which keeps the horn mouth 3 axially separated from the tip of the blades of the secondary cyclone separator 6 by a certain distance, thus preventing breakdown and air discharge between the horn mouth 3 and the secondary cyclone separator 6. The isolation section 8 includes an outer ring groove 81, which is fitted with the inner ring groove 33 of the horn mouth 3 with a clearance fit. The lower end of the isolation section 8 is connected to the secondary cyclone separator 6, and the upper end of the isolation section 8 is connected to the inner ring groove 33 by ceramic-metal brazing.

[0045] The working principle of this invention is as follows: This invention is installed in conjunction with the main combustion stage of the combustion chamber. The combustion chamber shell is grounded, so that the pre-combustion stage centrifugal nozzle 4, the first-stage cyclone separator 5, the second-stage cyclone separator 6, and the venturi tube 7 are all grounded. The coaxiality tolerance of the coaxially mounted components of this invention is no higher than 0.05 mm.

[0046] Reference Figure 2 The high-voltage power supply passes through the high-voltage conductor 27 through the high-voltage conductor channel 211 inside the insulating sleeve base 21, and is introduced into the annular electrode core 22 enclosed inside the insulating sleeve 2. Under the pressing action of the insulating sleeve cover plate 23, reliable conduction is achieved by the high-voltage electrode needle core 24. The high-voltage electricity is stably conducted to the horn mouth 3 through the interference fit between the stepped limiting block 31 and the horn mouth 3, making it a high-voltage electrode. The venturi tube 7 and the secondary cyclone separator 6 extend integrally and are grounded, forming a stable opposing electrode structure. The isolation section 8, as an insulating rotating body, is connected to the inner ring groove 33 of the horn mouth 3 through the outer ring groove 81. On the other hand, it maintains a set distance between the horn mouth 3 and the tip of the blade of the secondary cyclone separator 6 in the axial direction, which avoids electric field distortion and forms a local minimum discharge gap. When the high voltage is applied, the air at the minimum distance between the horn mouth 3 and the venturi tube 7 is broken down under the action of a strong electric field, forming an initial arc channel. Simultaneously, the dual-stage radial swirling airflow generated by the first-stage swirler 5 and the second-stage swirler 6 applies tangential and axial momentum to the root of the electric arc, causing the arc to be continuously stretched, deflected, and slid downstream along the inner edge of the bell mouth 3 and the venturi tube 7, while simultaneously rotating continuously in the circumferential direction, ultimately forming a spatially unfolded three-dimensional rotating sliding arc. This sliding arc is distributed in the outlet region of the venturi tube 7, precisely coupling with the fine fuel droplets injected through the pre-combustion stage centrifugal nozzle 4 and accelerated atomized within the venturi tube 7, achieving large-area discharge and efficient fuel-gas activation, thereby significantly improving ignition and combustion efficiency.

[0047] Reference Figure 8Driven by a high-voltage power supply, a stable air breakdown discharge is formed between the high-voltage flare and the grounded venturi tube on the integrated nozzle. The electric arc covers the entire nozzle outlet and is evenly distributed. The arc rotates uniformly under the blowing of the incoming swirling airflow, and the heat and active particles generated can provide a better excitation effect for the spray, while greatly reducing the risk of ablation.

[0048] Reference Figure 9 Existing technologies for sliding arc rotation have limited effectiveness and a small operating range. In contrast, this invention, driven by airflow, exhibits superior arc motion characteristics, resulting in a significantly expanded discharge sweep area. Comparative results demonstrate that this invention effectively enhances the driving effect of airflow on the arc, significantly improving the plasma processing range and uniformity.

Claims

1. A plasma-integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber, characterized in that, The device includes a metal sleeve (1), an insulating sleeve (2), and a bell mouth (3) coaxially mounted along the fuel flow direction. One end of the metal sleeve (1) is connected to one end of the insulating sleeve (2), and the constricted part of the bell mouth (3) extends into the insulating sleeve (2), with its outer side connected to the inner wall of the insulating sleeve (2). An axial channel is formed at the center of the metal sleeve (1), the insulating sleeve (2), and the bell mouth (3). In the axial channel, a pre-combustion stage centrifugal nozzle (4) and a multi-stage cyclone separator are sequentially arranged along the fuel flow direction. The multi-stage cyclone separator is grounded. The horn (3) is made of a conductor material. An annular battery core (22) is embedded in the insulating sleeve (2). The annular battery core (22) is connected to the plasma power source through a high-voltage wire (27) and is connected to the outside of the horn (3) through a high-voltage electrode needle core (24) so ​​that the horn (3) becomes a high-voltage electrode.

2. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 1, characterized in that, The multi-stage cyclone separator is composed of a first-stage cyclone separator (5) and a second-stage cyclone separator (6) coaxially welded together. The pre-combustion stage centrifugal nozzle (4) is installed at the inlet end of the first-stage cyclone separator (5). The base center of the second-stage cyclone separator (6) extends along the fuel flow direction and passes over the cyclone vanes, thereby forming a venturi tube (7), which is grounded.

3. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 2, characterized in that, Both the primary hydrocyclone (5) and the secondary hydrocyclone (6) are radial hydrocyclones with a cyclone blade angle of 40-60°. The axial length of the primary hydrocyclone (5) is 8-15 mm, and the axial length of the secondary hydrocyclone (6) is 12-20 mm.

4. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 2, characterized in that, The axial length of the Venturi tube (7) is 10-15 mm.

5. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 1 or 2, characterized in that, The constricted part of the horn (3) is connected to the outlet end of the multi-stage cyclone separator through the isolation section (8). The isolation section (8) is an axially hollow insulating rotating body with an axial length of 4-6mm to avoid air discharge breakdown between the horn (3) and the multi-stage cyclone separator.

6. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 5, characterized in that, The isolation section (8) includes an outer ring groove (81) of the isolation section, which is fitted with the inner ring groove (33) of the horn mouth (3) with a clearance fit. The connection between the lower end of the isolation section (8) and the secondary cyclone separator (6) and the connection between the upper end of the isolation section (8) and the inner ring groove (33) are both fastened by ceramic metal brazing.

7. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 1 or 2, characterized in that, The insulating sleeve (2) includes an insulating sleeve base (21), a high-voltage conductor channel (211) is opened on the base step, and an insulating layer socket (212) is opened on the outside of the insulating sleeve base (21), the high-voltage conductor channel (211) is connected to the insulating layer socket (212); an annular battery core (22) and an insulating sleeve cover plate (23) are fitted on the insulating sleeve base (21), the insulating sleeve cover plate (23) and the insulating sleeve base (21) form a closed space; the annular battery core (22) and the high-voltage conductor (27) are connected through... The connection is made by welding. After passing through the high-voltage conductor channel (211), it is connected to the plasma power source. The high-voltage conductor (27) is covered with an insulating sleeve (26). The end of the insulating sleeve (26) is inserted into the insulating layer socket (212). The insulating sleeve cover plate (23) has a high-voltage electrode hole (25). A high-voltage electrode needle core (24) is inserted into the high-voltage electrode hole (25). The high-voltage electrode needle core (24) presses the annular battery core (22) to ensure that the high-voltage conductor (27), the annular battery core (22), and the high-voltage electrode needle core (24) are connected.

8. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 7, characterized in that, The insulation layer socket (212) has a depth of 2-4 mm and a diameter of 2-4 mm; the high-voltage conductor (27) has a diameter of 1-1.5 mm.

9. A plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 1 or 2, characterized in that, The flared mouth (3) includes stepped limiting blocks (31) evenly distributed at equal intervals along the circumference. The stepped limiting blocks (31) are radially protruding so that the flared mouth (3) and the insulating sleeve (2) are interference fit and tightly attached to the high voltage electrode hole (25). The stepped limiting blocks (31) completely cover the high voltage electrode hole (25) in the circumference. The flared mouth (3) extends outward and is tightly attached to the insulating sleeve cover plate (23) of the insulating sleeve (2) through the step (32). The bottom of the flared mouth (3) is tightly connected to the isolation section (8) through the inner ring groove (33).

10. The plasma integrated ignition and combustion-supporting nozzle for a multi-stage swirling combustion chamber according to claim 9, characterized in that, The thickness of the step limiting block (31) is 1-2mm, and the number is 6-10.

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