CN114623468A - DBD plasma combustion chamber head nozzle with circular truncated cone structure - Google Patents

DBD plasma combustion chamber head nozzle with circular truncated cone structure Download PDF

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Publication number
CN114623468A
CN114623468A CN202210197068.8A CN202210197068A CN114623468A CN 114623468 A CN114623468 A CN 114623468A CN 202210197068 A CN202210197068 A CN 202210197068A CN 114623468 A CN114623468 A CN 114623468A
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China
Prior art keywords
truncated cone
nozzle
main body
cyclone
body part
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CN202210197068.8A
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CN114623468B (en
Inventor
邓俊
卢永吉
周俊杰
崔连柱
陈宇
孙莹
朱丽
刘秋成
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PLA AIR FORCE AVIATION UNIVERSITY
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PLA AIR FORCE AVIATION UNIVERSITY
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/38—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising rotary fuel injection means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma Technology (AREA)

Abstract

The invention discloses a DBD plasma combustion chamber head nozzle with a circular truncated cone structure, which is arranged at the head of a combustion chamber, adopts an integrated design scheme of a combustion-supporting exciter, a cyclone and a nozzle, and comprises a primary cyclone, a secondary cyclone, a nozzle main body part, an insulating barrier medium layer, a central high-voltage electrode, a positioning bracket, a high-voltage lead, a plugging cap and a fixing nut; the primary cyclone is coaxially fixed in the nozzle main body part, the nozzle main body part is embedded in the secondary cyclone, and an outlet plug cap at the upper end of the nozzle main body part is sealed and is grounded through a metal air inlet pipe; the central high-voltage electrode is sleeved on the positioning bracket; the insulating barrier dielectric layer is sleeved on the central electrode and is in sealed connection with the positioning bracket; the positioning bracket is fixed at the bottom of the secondary cyclone in a sealing way; the insulating barrier medium layer is positioned in the nozzle main body part and keeps a certain gap with the inner wall of the nozzle main body part; a high voltage lead connects the center high voltage electrode to a high voltage terminal of the plasma drive power supply.

Description

DBD plasma combustion chamber head nozzle with circular truncated cone structure
Technical Field
The invention relates to an auxiliary combustion technology in the field of combustion science, in particular to a Dielectric Barrier Discharge (DBD) plasma combustion chamber head nozzle with a truncated cone structure.
Background
Conventionally, in order to stabilize combustion, various devices for stabilizing flame are generally provided in a combustion chamber head. Such as a swirler or a V-shaped flame holder, etc. For gaseous fuels, it is necessary to admix them with an oxidant before the combustion reaction can take place. For liquid fuels, such as liquid aviation kerosene in an aviation engine, the liquid fuels need to undergo atomization and evaporation processes before entering the mixing and combustion reaction process. By mechanical cooperation of the fuel nozzles of different configurations and the flame stabilizer, conditions can be provided for stable combustion in the combustion chamber. The nozzles at the head of the combustion chamber of the aircraft engine comprise a centrifugal nozzle, a pneumatic nozzle, an evaporation pipe nozzle and the like, and the nozzles of the types mainly improve the combustion performance of the combustion chamber by improving atomization and evaporation. Compared with other nozzles, the evaporation tube type nozzle can premix oil gas and evaporate fuel oil, so that the whole combustion process is accelerated, and the combustion efficiency is improved. In the combustion reaction stage, large molecule hydrocarbon fuels need to undergo longer chemical reaction branches than small molecule gaseous fuels to achieve complete combustion. At the head of the combustion chamber, the improvement of the working condition of the combustion chamber from the design of a novel fuel nozzle, a multi-stage rotational flow head and the like is studied. However, the above nozzles of different structures do not change the fuel molecular structure before the combustion reaction stage, and thus it is difficult to further improve the combustion efficiency by shortening the chemical reaction branches of the combustion reaction stage.
Plasma combustion supporting has shown great application potential as a novel intensified combustion technology. This technique provides a new approach to improving combustor performance. The dielectric barrier discharge is used as a form of plasma generation, can generate uniform and large-volume plasma, cracks and recombines macromolecular fuel, and has application in many practical engineering scenes. Due to the working limitation of the traditional processing technology and the dielectric barrier discharge, the application of DBD plasma combustion-supporting in the head part of the combustion chamber still has a plurality of problems to be solved. According to the characteristics of a general combustion chamber head, if the combustion performance of the combustion chamber is improved by a DBD plasma combustion supporting method, the problems of high-voltage wiring and temperature resistance of a plasma device need to be solved, and the problem that a special-shaped component is difficult to process is solved.
The head nozzle of the DBD plasma combustion chamber with the circular truncated cone structure is from the practical engineering application problem of improving the combustion efficiency of gas fuel in the combustion chamber.
Disclosure of Invention
In order to solve the problems of narrow combustion flameout boundary and low combustion efficiency of macromolecular gas fuel in a combustion chamber, the invention provides a DBD plasma combustion chamber head nozzle with a circular truncated cone structure, which is arranged at the head of the combustion chamber, adopts an integrated design scheme of a combustion-supporting exciter, a swirler and the nozzle, can ionize air-gas fuel mixture, and leads the fuel to be cracked and recombined in a circular truncated cone type dielectric barrier discharge area to generate high-concentration active particles. After entering the combustion area, the active particles are further mixed with air to participate in combustion, so that the purposes of enhancing the combustion of combustible mixed gas and improving the combustion efficiency are achieved, and the space, the volume and the weight occupied by the head device of the combustion chamber can be reduced to the maximum extent.
The purpose of the invention is realized by the following technical scheme, which is combined with the attached drawings:
a DBD plasma combustion chamber head nozzle with a circular truncated cone structure comprises a primary cyclone 1, a secondary cyclone 2, a nozzle main body part 3, an insulating barrier medium layer 4, a central high-voltage electrode 5, a positioning support 6, a high-voltage lead 7, a blocking cap 8 and a fixing nut 9; the primary cyclone 1 is coaxially fixed in the nozzle main body part 3, the nozzle main body part 3 is embedded into a central circular table hole of the secondary cyclone 2 from bottom to top, and the position is limited by a fixing nut 9; the upper end outlet of the nozzle main body part 3 is sealed by a blocking cap 8 with a hole in the middle, a metal air inlet pipe is fixed by the middle hole of the blocking cap 8, and the nozzle main body part 3 is grounded by the metal air inlet pipe; the central high-voltage electrode 5 is coaxially sleeved on the positioning bracket 6; the insulating barrier dielectric layer 4 is coaxially sleeved on the central electrode 5 and is in sealing connection with the positioning support; the positioning bracket 6 is fixed at the bottom of the secondary cyclone 2 in a sealing way; the insulating barrier medium layer 4 is positioned in the nozzle main body part 3 and keeps a certain gap with the inner wall of the nozzle main body part; one section of the high-voltage lead 7 is welded on a binding post at the center of the central high-voltage electrode 5, and the other end of the high-voltage lead passes through a lead hole in the positioning bracket 6 to connect the central high-voltage electrode 5 to the high-voltage end of the plasma driving power supply.
Further, the nozzle main body part 3 is made of metal materials, the nozzle main body part 3 is of an integral structure and comprises a main body part body, a mixing air chamber 18 is arranged at the upper part of the main body part body, the bottom of the mixing air chamber 18 is communicated with a truncated cone-shaped outlet, and a truncated cone angle alpha of the truncated cone-shaped outlet040 to 80 degrees; the part of the expanding section of the truncated cone-shaped outlet is used as a truncated cone grounding electrode 17; and a gap between the insulating barrier dielectric layer 4 and the circular truncated cone grounding electrode 17 is a plasma discharge area.
Furthermore, an outlet at the upper end of the mixing air chamber 18 is connected with the plugging cap 8 with a hole in the middle through a plugging cap matching thread 15, and a metal air inlet pipe is fixed in the middle hole of the plugging cap 8, so that the circular truncated cone grounding electrode 17 is always grounded; a primary cyclone matching thread 14 is arranged at the joint of the mixing air chamber 18 and the circular truncated cone-shaped outlet, and the primary cyclone matching thread 14 is connected with an external fixed thread 12 of the primary cyclone 1; the periphery of the main body part is provided with a fixing nut matching thread 16, and the nozzle main body part 3 is embedded into a central circular platform hole of the secondary cyclone 2 from bottom to top and then is fixedly connected with an internal thread of the fixing nut 9 through the fixing nut matching thread 16.
Further, the insulation blocking dielectric layer 4 is a hollow cone with a round apex angle, the material is ceramic or quartz glass, the thickness delta of the dielectric layer is 1-2.5 mm, and the hollow cone angle alpha1A truncated cone angle alpha with the truncated cone shaped outlet of the nozzle body 30Are equal.
Further onThe central high-voltage electrode 5 is a hollow metal cone with a dome angle; hollow metal cone angle alpha2A truncated cone angle alpha with the truncated cone shaped outlet of the nozzle body 30Are equal.
Furthermore, the primary cyclone 1 is a chamfered hole cyclone made of metal.
Furthermore, the secondary cyclone 2 adopts a vane type cyclone, the material is ceramic, and the number of the cyclone vanes is integral multiple of 3.
Further, the positioning bracket 6 is made of ceramic; the positioning bracket 6 mainly comprises a bracket body, a supporting blade 20, a wire guide hole 21 and an outer edge ring, wherein the supporting blade 20 is fixed between the bracket body and the outer edge ring; the upper part of the center of the bracket body is provided with a round table for coaxially fixing a center high-voltage electrode 5 and an insulating barrier medium layer 4 in sequence, and a gap between the insulating barrier medium layer 4 and the positioning bracket 6 is stuck and sealed by high-temperature solid insulating sealant; the wire guide hole 20 passes through the support blade 20 from the center of the body of the positioning bracket 6, and is led to the outer side of the outer edge ring for passing through the high-voltage wire 7; the outer edge ring is provided with an outer edge groove 22, the outer edge positioning support 6 is sleeved at the bottom of the secondary cyclone 2 from bottom to top through the outer edge groove 22, the upper edge of a supporting blade of the positioning support 6 is aligned to the lower edge of a cyclone blade of the secondary cyclone 2, and the contact part of the upper edge and the lower edge of the cyclone blade is sealed by adopting high-temperature solid insulating sealant.
Further, the support blade angle β0A swirl angle beta with the primary swirler 11And the blade angle beta of the secondary swirler 22Equal, 40-70 deg.
Compared with the prior art, the invention has the following beneficial effects:
in the prior art, most of the nozzles, the cyclones and the plasma combustion-supporting exciters are designed independently and are independent parts, and then work in a mode of mutually matching work. The invention adopts the scheme of integrally designing the fuel nozzle, the swirler and the combustion-supporting exciter, and can reduce the space, the volume and the weight occupied by the head device of the combustion chamber to the maximum extent.
The invention combines the structural characteristics of the fuel nozzle, the single-layer dielectric barrier discharge plasma generator, the swirler and the flame stabilizer, integrates the functions of the devices, and can be used for improving the combustion stability range of gas fuel in the combustion chamber and improving the combustion efficiency, thereby achieving the purpose of improving the combustion performance of the combustion chamber.
The plasma discharge scheme of the invention can be used as a combustion-supporting exciter, has the function of combustion enhancement, and has the function of pre-burning the mixed gas when the speed of the air-gas fuel mixed gas is low.
Most of the existing DBD plasma discharge structures adopt coaxial circular tube type or flat plate type structures. The matching difficulty of the two structures and the combustor is large. The plasma discharge structure adopts a circular truncated cone type dielectric barrier discharge structure, and breaks through the design limitation of the traditional coaxial circular tube type and flat plate type dielectric barrier discharge structures.
The central blocking dielectric layer adopts a circular truncated cone structure, and can form a stable combustion backflow area after airflow passes through the circular truncated cone structure, so that the circular truncated cone structure has the function of stabilizing flame.
The invention processes the special-shaped part by metal printing and ceramic printing technologies, so that the part has good mechanical strength and the processing cost is favorably reduced.
The invention has strong practicability and universality, and can be used for burners for burning most of gas fuels. Especially in the aeroengine adopting the evaporation tube type nozzle, the device is beneficial to strengthening the combustion of macromolecular gas fuel.
Drawings
FIG. 1 is a schematic diagram of a semi-sectional structure of a DBD plasma combustion chamber head nozzle with a truncated cone structure according to an embodiment of the invention;
FIG. 2 is an isometric view of a DBD plasma combustor head nozzle with a truncated cone-shaped configuration according to an embodiment of the invention;
FIG. 3(a) is an isometric view of a primary cyclone according to the present embodiment of the invention;
FIG. 3(b) is a schematic top view of a primary cyclone according to the present embodiment of the invention;
FIG. 3(c) is a schematic diagram illustrating the distribution of the chamfered holes of the primary cyclone according to the present embodiment of the invention;
FIG. 4(a) is a schematic isometric view of a secondary cyclone according to the present embodiment of the invention;
FIG. 4(b) is a schematic cross-sectional view of the secondary cyclone in the present embodiment of the invention;
FIG. 4(c) is a schematic representation of the secondary swirler vane feature described in the present embodiment of the invention;
FIG. 5 is a cross-sectional view of the nozzle body member according to this embodiment of the present invention;
FIG. 6 is a schematic cross-sectional structural view of an insulating barrier dielectric layer according to the embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of the center high voltage electrode according to the present embodiment of the invention;
FIG. 8(a) is an isometric view of a positioning bracket according to an embodiment of the invention;
FIG. 8(b) is a cross-sectional view of a positioning bracket according to an embodiment of the present invention;
FIG. 8(c) is a schematic view of a blade feature of a positioning frame according to an embodiment of the present invention.
In the figure:
1. a primary swirler; 2. a secondary cyclone; 3. a nozzle body member; 4. an insulating barrier dielectric layer; 5. a central high voltage electrode; 6. positioning the bracket; 7. a high-voltage wire; 8. a plugging cap; 9. fixing a nut; 10. obliquely cutting a hole; 11. a straight slot; 12, external fixing threads; 13. swirler vanes; 14. matching threads of the primary cyclone; 15. the plug cap is matched with the thread; fixing the nut matching thread; 17. a circular truncated cone grounding electrode; 18. a mixing gas chamber; 19. a binding post; 20. supporting the blade; 21. a wire guide hole; 22. an outer edge groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment discloses a circular truncated cone-shaped DBD plasma combustion chamber head nozzle, which is arranged at the head of a combustion chamber, adopts an integrated design scheme of a combustion-supporting exciter, a swirler and the nozzle, can ionize air-gas fuel mixed gas, and leads the fuel to be cracked and recombined in a circular truncated cone-shaped dielectric barrier discharge area to generate high-concentration active particles. After entering the combustion area, the active particles are further mixed with air to participate in combustion, so that the purposes of enhancing the combustion of combustible mixed gas and improving the combustion efficiency are achieved.
As shown in fig. 1 and 2, the DBD plasma combustor head nozzle with a truncated cone structure according to this embodiment includes the following 9 inseparable independent components: the device comprises a primary cyclone 1, a secondary cyclone 2, a nozzle main body part 3, an insulation barrier medium layer 4, a central high-voltage electrode 5, a positioning bracket 6, a high-voltage lead 7, a plugging cap 8 and a fixing nut 9. The primary cyclone 1 is coaxially fixed in the nozzle main body part 3, and the nozzle main body part 3 is embedded into a central circular table hole of the secondary cyclone 2 from bottom to top and is limited by a fixing nut 9. The upper end outlet of the nozzle main body part 3 is sealed by a blocking cap 8 with a hole in the middle, a metal air inlet pipe is fixed by the middle hole of the blocking cap 8, and the nozzle main body part 3 is grounded by the metal air inlet pipe. The central high-voltage electrode 5 is coaxially sleeved on the positioning bracket 6 from top to bottom; the insulating barrier dielectric layer 4 is coaxially sleeved on the central electrode 5 from top to bottom and is hermetically connected with the positioning support. And the positioning bracket 6 is fixed at the bottom of the secondary cyclone 2 in a sealing way. The dielectric barrier layer 4 is located inside the nozzle body 3 with a gap from the inner wall of the nozzle body. One section of the high-voltage lead 7 is welded on a binding post at the center of the central high-voltage electrode 5, and the other end of the high-voltage lead passes through a lead hole in the positioning bracket 6 to connect the central high-voltage electrode 5 to the high-voltage end of the plasma driving power supply.
As shown in fig. 5, the nozzle body 3 is an integral structure and includes a body, a primary swirler mating thread 14, a cap mating thread 15, a fixing nut mating thread 16, a truncated cone ground electrode 17, and a mixing air chamber 18. The upper part of the main body part is provided with a mixing air chamber 18, the bottom of the mixing air chamber 18 is communicated with a truncated cone-shaped outlet, and the expanding section part of the truncated cone-shaped outlet is used as a truncated cone grounding electrode 17. The upper end outlet of the mixing air chamber 18 is provided with a plugging cap matching thread 15, the plugging cap matching thread 15 is connected with a plugging cap 8 with a hole in the middle, sealing is achieved, a metal air inlet pipe is fixed in the middle hole of the plugging cap 8, and the metal air inlet pipe is grounded, so that a circular truncated cone grounding electrode 17 of the nozzle main body part 3 is grounded all the time. The joint of the mixing air chamber 18 and the circular truncated cone-shaped outlet is provided with a primary cyclone matching thread 14, and the primary cyclone matching thread 14 is connected with an external fixed thread 12 of the primary cyclone 1, so that the primary cyclone 1 is fixed on the nozzle main body part 3. The periphery of the main body part is provided with a fixing nut matching thread 16, and the nozzle main body part 3 is embedded into a central circular truncated cone hole of the secondary cyclone 2 from bottom to top and then is fixedly connected with an internal thread of the fixing nut 9 through the fixing nut matching thread 16 to limit the nozzle main body part 3 and the secondary cyclone 2. The mixing air chamber 18 is a small cavity for ensuring that the air-gas fuel mixture or the gas fuel uniformly flows out from the chamfered hole of the primary swirler 1 after passing through the mixing air chamber 18. The cone-shaped outlet expanding section of the nozzle main body piece 3 is used as a grounding electrode, the cone-shaped outlet expanding section, the insulating barrier medium layer 4 and the central high-voltage electrode 5 form a cone-shaped DBD plasma combustion-supporting exciter, and a gap between the insulating barrier medium layer 4 and the cone-shaped grounding electrode of the nozzle main body piece 3 is a plasma discharge area.
The nozzle main body part 3 is made of metal materials and is formed by machining or 3D metal printing, and a truncated cone angle alpha of a truncated cone-shaped outlet of the nozzle main body part 30Is 40 to 80 degrees. In this embodiment, alpha is preferred0Is 60 degrees.
The primary swirler 1 adopts a chamfered hole swirler made of metal. As shown in fig. 3(a) to 3(c), the primary swirler 1 includes a primary swirler body, a chamfered hole 10, a straight groove 11 and an external fixing thread 12; the number of the inclined cutting holes is 3-8, and the inclined cutting holes 10 are uniformly distributed on the primary swirler body along the radial direction; the straight groove 11 is arranged on the primary swirler body; the external fixed thread 12 is arranged on the periphery of the primary cyclone body. During assembly, the primary swirler 1 is fixed on the nozzle body 3 by screwing the external fixing thread 12 of the primary swirler 1 into the primary swirler matching thread 14 of the nozzle body 3 through the straight groove 11 by a screwdriver. In this embodiment, the number of the chamfered holes is preferably 6.
The secondary cyclone 2 is a vane type cyclone made of ceramic, the number of the cyclone vanes is multiple of 3, and the number of the cyclone vanes is 9 in the embodiment.
The insulation blocking dielectric layer 4 is a hollow cone with a round apex angle, the material is ceramic or quartz glass, the thickness delta of the dielectric layer is 1-2.5 mm, and the hollow cone angle alpha1Circular truncated cone angle alpha with the nozzle body 30Are equal. In this example, the material was quartz glass, and the thickness δ of the dielectric layer was 2 mm.
The central high-voltage electrode 5 is a hollow metal cone with a round apex angle, and a binding post is arranged in the center. Hollow metal cone angle alpha2Circular truncated cone angle alpha with the nozzle body 30Are equal.
The positioning support 6 is made of ceramic and is machined or 3D metal printed and formed. The positioning bracket 6 mainly comprises a bracket body, a supporting blade 20, a wire guide hole 21 and an outer edge ring, wherein the supporting blade 20 is fixed between the bracket body and the outer edge ring; the upper part of the center of the bracket body is provided with a round table for coaxially fixing the central high-voltage electrode 5 and the insulating barrier medium layer 4 in sequence, and a gap between the insulating barrier medium layer 4 and the positioning bracket 6 is pasted and sealed by high-temperature solid insulating sealant. A wire guide hole 21 is led from the center of the body of the positioning bracket 6 through the support blade 20 to the outside of the outer peripheral ring for passing the high-voltage wire 7; the outer edge ring is provided with an outer edge groove 22, the outer edge positioning support 6 is sleeved at the bottom of the secondary cyclone 2 from bottom to top through the outer edge groove 22, the upper edge of a supporting blade of the positioning support 6 is aligned to the lower edge of a cyclone blade of the secondary cyclone 2, and the contact part of the upper edge and the lower edge of the cyclone blade is sealed by adopting high-temperature solid insulating sealant. Number of supporting blades is 3, supporting blade angle beta0 First stage swirler 1 swirl angle beta1 Second stage swirler 2, blade angle beta2Equal to 40-70 degrees. In this embodiment, β is preferable0Is 60 degrees.
The assembly of the present embodiment is described below:
when assembled, external fixture threads 12 of the primary swirler 1 are screwed into primary swirler mating threads 14 of the nozzle body 3. Then the nozzle main body part 3 is embedded into a central circular platform hole of the secondary cyclone 2 from bottom to top, and the fixing nut matching thread 16 of the nozzle main body part 3 is screwed up through the fixing nut 9, so that the nozzle main body part 3 and the secondary cyclone 2 are limited. The upper end of a mixing air chamber 18 of the nozzle main body part 3 is screwed and sealed with a plugging cap 8 with a hole in the middle through a plugging cap matching thread 15, a metal air inlet pipe is fixed through the middle hole of the plugging cap 8, and a circular truncated cone grounding electrode 17 of the nozzle main body part 3 is grounded through the metal air inlet pipe. One end of the high-voltage lead 7 is welded on a binding post at the center of the center high-voltage electrode 5, and the other end of the high-voltage lead passes through a lead hole 21 in the positioning bracket 6 and is connected to the high-voltage end of the plasma driving power supply. The central high-voltage electrode 5 is coaxially positioned on the circular truncated cone at the center of the positioning bracket 6 from top to bottom. Then, the insulating barrier dielectric layer 4 is coaxially sleeved on the central high-voltage electrode 5 from top to bottom. And a gap between the insulating barrier dielectric layer 4 and the positioning support 6 is sealed by adopting high-temperature solid insulating sealant. The positioning support 6 is fixed below the secondary cyclone 2 from bottom to top through an outer edge groove, the upper edge of a supporting blade of the positioning support 6 is kept flush with the lower edge of a rotational flow blade of the secondary cyclone 2, and a high-temperature solid insulating sealant is adopted to adhere and seal the contact part of the two. After the positioning support 6 is fixed with the secondary cyclone 2, the insulating barrier medium layer 4 is positioned in the truncated cone-shaped outlet of the nozzle main body part 3 and keeps a certain gap with the truncated cone-shaped grounding electrode, and a gap between the insulating barrier medium layer 4 and the truncated cone-shaped grounding electrode is a plasma discharge area.
The working principle of the embodiment is described as follows:
for convenience of description, the upper part of the invention is the upstream of the airflow, and the lower part is the downstream of the airflow. In the working process of the embodiment, the circular truncated cone grounding electrode and the central high-voltage electrode 5 of the nozzle main body piece 3 are driven to discharge through a single high-voltage plasma power supply, and a plasma discharge area is formed in a gap between the insulating barrier medium layer 4 and the circular truncated cone grounding electrode of the nozzle main body piece 3.
The first air flow adopts air-butane mixed gas, enters a mixing air chamber of the nozzle main body part 3, passes through the inclined cutting hole of the primary swirler 1, and flows to the DBD plasma discharge area in a swirling flow mode with lower axial speed. At this time, a high-voltage alternating current power supply is applied to two ends of the DBD electrode to discharge gas in a discharge area, the mixed gas is ionized, gas fuel is cracked and recombined, active particles and intermediate products which are large in size, high in concentration, stronger in oxidizability and more beneficial to combustion are generated, and the combustion reaction can be carried out more quickly. Under the blowing action of the airflow, the gas mixed with the plasma flows to the outlet of the cyclone, and a backflow area beneficial to combustion is formed at the outlet of the nozzle under the action of the primary cyclone 1 and the insulating barrier medium layer 4. The second stream of air, which is air, flows through the airflow channels between the swirl vanes of the secondary swirler 2 from top to bottom, creating a swirl at a lower axial velocity. The outlet of the embodiment is further mixed with the cracked and recombined gas fuel for efficient combustion, thereby achieving the purpose of improving the combustion performance of the combustion chamber.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present embodiment, the terms "inside", "outside", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. A DBD plasma combustion chamber head nozzle with a circular truncated cone structure is characterized by comprising a primary cyclone (1), a secondary cyclone (2), a nozzle main body part (3), an insulating barrier dielectric layer (4), a central high-voltage electrode (5), a positioning support (6), a high-voltage lead (7), a plugging cap (8) and a fixing nut (9); the primary swirler (1) is coaxially fixed in the nozzle main body piece (3), the nozzle main body piece (3) is embedded into a central circular table hole of the secondary swirler (2) from bottom to top, and the position is limited through a fixing nut (9); an outlet at the upper end of the nozzle main body part (3) is sealed by a blocking cap (8) with a hole in the middle, a metal air inlet pipe is fixed by the hole in the middle of the blocking cap (8), and the nozzle main body part (3) is grounded by the metal air inlet pipe; the central high-voltage electrode (5) is coaxially sleeved on the positioning bracket (6); the insulating barrier dielectric layer (4) is coaxially sleeved on the central electrode (5) and is in sealing connection with the positioning support; the positioning bracket (6) is fixed at the bottom of the secondary cyclone (2); the insulating barrier dielectric layer (4) is positioned in the nozzle main body piece (3), keeps a certain gap with the inner wall of the nozzle main body piece, and is coaxially sleeved on the central electrode (5); one section of the high-voltage lead (7) is welded on a binding post at the center of the central high-voltage electrode (5), and the other end of the high-voltage lead passes through a lead hole in the positioning bracket (6) to connect the central high-voltage electrode (5) to the high-voltage end of the plasma driving power supply.
2. The head nozzle of DBD plasma combustion chamber with the circular truncated cone-shaped structure according to claim 1, wherein the nozzle body (3) is made of metal material, the nozzle body (3) is an integrated structure and comprises a body, a mixing air chamber (18) is arranged at the upper part of the body, a circular truncated cone-shaped outlet is communicated with the bottom of the mixing air chamber (18), and a circular truncated cone angle alpha of the circular truncated cone-shaped outlet040 to 80 degrees; the expanding section part of the truncated cone-shaped outlet is used as a truncated cone grounding electrode (17); and a gap between the insulating barrier dielectric layer (4) and the circular truncated cone grounding electrode (17) is a plasma discharge area.
3. The DBD plasma burner head nozzle of truncated cone structure according to claim 2, wherein the outlet at the upper end of the mixing gas chamber (18) is connected with the blanking cap (8) with a hole at the middle through the blanking cap matching screw thread (15), the metal inlet pipe is fixed at the middle hole of the blanking cap (8), and the truncated cone grounding electrode (17) is grounded all the time through the metal inlet pipe; a primary cyclone matching thread (14) is arranged at the joint of the mixing air chamber (18) and the circular truncated cone-shaped outlet, and the primary cyclone matching thread (14) is connected with an external fixed thread (12) of the primary cyclone (1); the periphery of the main body part body is provided with a fixing nut matching thread (16), and the nozzle main body part (3) is embedded into a central circular truncated cone hole of the secondary cyclone (2) from bottom to top and then is fixedly connected with an internal thread of the fixing nut (9) through the fixing nut matching thread (16).
4. The DBD plasma burner head nozzle of truncated cone structure according to claim 2, wherein the dielectric barrier layer (4) is a hollow cone with a rounded apex angle, the material is ceramic or quartz glass, the dielectric layer thickness δ is 1-2.5 mm, the hollow cone angle α is1A truncated cone angle alpha with a truncated cone outlet of the nozzle body piece (3)0Are equal.
5. The DBD plasma burner head nozzle of truncated cone structure as claimed in claim 2, wherein the central high voltage electrode (5) is a hollow metal cone with a rounded top; hollow metal cone angle alpha2A truncated cone angle alpha with a truncated cone outlet of the nozzle body piece (3)0Are equal.
6. The DBD plasma burner head nozzle of a truncated cone type structure according to claim 1, wherein the primary swirler (1) is a chamfered hole swirler and is made of metal.
7. The DBD plasma combustor head nozzle of a truncated cone type structure according to claim 1, wherein the secondary swirler (2) is a vaned swirler, the material is ceramic, and the number of swirl vanes is an integer multiple of 3.
8. The DBD plasma burner head nozzle of truncated cone structure as claimed in claim 1, wherein the material of the positioning bracket (6) is ceramic; the positioning bracket (6) mainly comprises a bracket body, a supporting blade (20), a wire guide hole (21) and an outer edge ring, wherein the supporting blade (20) is fixed between the bracket body and the outer ring; the upper part of the center of the bracket body is provided with a round table for coaxially fixing a center high-voltage electrode (5) and an insulating barrier medium layer (4) in sequence, and a gap between the insulating barrier medium layer (4) and the positioning bracket (6) is sealed by adopting high-temperature solid insulating sealant; a wire guide hole (21) penetrates through the supporting blade (20) from the center of the body of the positioning bracket (6) and leads to the outer side of the outer edge ring for passing through a high-voltage wire (7); the outer edge ring is provided with outer edge grooves (22), the outer edge positioning support (6) is sleeved at the bottom of the secondary cyclone (2) from bottom to top through the outer edge grooves (22), the upper edge of the supporting blade of the positioning support (6) is aligned to the lower edge of the cyclone blade of the secondary cyclone (2) in a flush manner, and the contact part of the upper edge and the lower edge of the cyclone blade is sealed by adopting high-temperature solid insulating sealant.
9. The DBD plasma combustor head nozzle of a truncated cone type structure as claimed in claim 8, wherein the supporting blade angle β is0A swirl angle beta with the primary swirler (1)1And the blade angle beta of the secondary swirler (2)2Equal to 40-70 degrees.
CN202210197068.8A 2022-03-02 2022-03-02 DBD plasma combustion chamber head nozzle with round table structure Active CN114623468B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102351144A (en) * 2011-06-27 2012-02-15 武汉理工大学 Method and equipment for preparing hydrogen-rich gas through plasma/chemical catalytic composite reforming
CN110440291A (en) * 2019-08-01 2019-11-12 沈阳航空航天大学 Using the plasma fuel atomizer and control method of double mode excitation
CN111734532A (en) * 2020-06-21 2020-10-02 中国人民解放军空军工程大学 Filament arc plasma exciter based on swirl hole
CN111765032A (en) * 2020-06-12 2020-10-13 沈阳航空航天大学 Sliding arc plasma-high disturbance cross structure fuel oil atomizing nozzle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102351144A (en) * 2011-06-27 2012-02-15 武汉理工大学 Method and equipment for preparing hydrogen-rich gas through plasma/chemical catalytic composite reforming
CN110440291A (en) * 2019-08-01 2019-11-12 沈阳航空航天大学 Using the plasma fuel atomizer and control method of double mode excitation
CN111765032A (en) * 2020-06-12 2020-10-13 沈阳航空航天大学 Sliding arc plasma-high disturbance cross structure fuel oil atomizing nozzle
CN111734532A (en) * 2020-06-21 2020-10-02 中国人民解放军空军工程大学 Filament arc plasma exciter based on swirl hole

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