A low-pollution engine

Abstract

The present invention belongs to the field of engine technology and proposes a low-pollution engine comprising: an air intake, a compressor, a combustion chamber, a turbine, and an exhaust device. The combustion chamber comprises a fuel nozzle, a flame tube, and a tubular body. The tubular body is embedded in the flame tube, and the ends of the tubular body respectively penetrate the inner ring side wall and the outer ring side wall. The tubular body is coaxially provided with a hollow flow channel connected to the inner cavity of the casing. The side wall of the tubular body located in the inner cavity of the flame tube is provided with a plurality of air guide holes, and the plurality of air guide holes connect the hollow flow channel with the inner cavity of the flame tube. In the low-pollution engine of the present invention, after air is sequentially delivered to the combustion chamber through the air intake and the compressor, it is mixed with the injected fuel. By adding the tubular body and providing a plurality of air guide holes in the side wall of the tubular body connecting the hollow flow channel with the inner cavity of the flame tube, the contact area and mixing time between the two are increased, thereby improving the stability and efficiency of the combustion process in the entire combustion chamber, thereby reducing the generation of pollutants.

Description

Technical Field

[0001] The invention belongs to the technical field of engines, and in particular relates to a low-pollution engine. Background Art

[0002] The main development direction of aircraft engine combustion technology is low pollution and economy. In addition to meeting increasingly stringent aircraft engine pollution emission standards, aircraft engine combustion chambers must also meet economic requirements, that is, lighter weight and lower fuel consumption.

[0003] However, in the actual design process, in order to achieve the goal of low pollution emissions, the simplicity of the combustion chamber structure is usually sacrificed, such as axial and radial staged combustion chambers, LPP combustion chambers, and LDI combustion chambers; among them, taking axial and radial staged combustion chambers as an example, it is necessary to set up multiple combustion zones and be equipped with independent fuel injection systems, airflow distribution mechanisms and ignition control logic, which not only increases the geometric complexity of the flame tube, but also requires additional oil supply lines, nozzles and control valves, making the overall structure more complicated and increasing the difficulty of maintenance.

[0004] Moreover, during the combustion process of the fuel in the combustion chamber of the engine, there is a problem of uneven mixing of fuel and air, which easily forms local oil-rich or oil-lean areas, resulting in differences in the combustion conditions of the fuel at different positions in the combustion chamber, causing incomplete combustion of the fuel, and then leading to the production of large amounts of pollutants such as nitrogen oxides (NOx) and carbon monoxide (CO), which also affects the overall output power of the engine.

[0005] In view of this, overcoming the defects of the above-mentioned prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0006] To address the above-mentioned problems, the present invention proposes a low-pollution engine comprising: a casing, an air intake, a compressor, a combustion chamber, a turbine, and an exhaust device connected in a front-to-rear manner, wherein the compressor, the combustion chamber, and the turbine are all accommodated in the inner cavity of the casing, and the combustion chamber includes a fuel nozzle, a flame tube, and a tubular body;

[0007] The flame tube includes an end side wall and an inner ring side wall and an outer ring side wall arranged in an inner and outer ring. One end of the fuel nozzle passes through the casing side wall and is connected to the engine fuel pipeline. The other end of the fuel nozzle passes through the end side wall and is connected to the flame tube inner cavity. The tubular body is embedded in the flame tube. The two ends of the tubular body pass through the inner ring side wall and the outer ring side wall respectively, and the tubular body is coaxially provided with a hollow flow channel connected to the casing inner cavity. The side wall of the tubular body located in the flame tube inner cavity is provided with a plurality of air guide holes, and the plurality of air guide holes connect the hollow flow channel and the flame tube inner cavity.

[0008] Furthermore, the side walls of the inner ring side wall and the outer ring side wall are both provided with a plurality of ventilation holes, the plurality of ventilation holes connect the inner cavity of the casing and the inner cavity of the flame tube, and the total area of the plurality of air guide holes accounts for 55% to 65% of the total area of the plurality of ventilation holes and the plurality of air guide holes.

[0009] Furthermore, a plurality of air guide hole ring groups are axially provided on the outer wall of the column body, the air guide hole ring group includes a plurality of circumferentially arranged air guide holes, the outer wall of the column body includes a coaxially arranged positioning ring line, the spacing between the positioning ring line and one end of the column body is half the spacing between the positioning ring line and the other end of the column body, and the spacing between the positioning ring line and the outer ring side wall is smaller than the spacing between the positioning ring line and the inner ring side wall;

[0010] The total area of the air guide hole ring group increases with the increase of the distance from the positioning ring line.

[0011] Furthermore, the air guide hole ring group includes a plurality of circumferentially arranged air guide holes, and the distance between adjacent air guide holes increases with the increase of the distance from the end side wall.

[0012] Furthermore, the axis of the tube body is arranged perpendicular to the axis of the flame tube, and the extension line of the axis of the tube body intersects with the axis of the combustion chamber.

[0013] Furthermore, it also includes a mounting seat and a cover part. The side walls of the inner ring side wall and the outer ring side wall are both equipped with mounting seats facing the inner cavity of the receiver. The inner wall of the mounting seat is sleeved with the outer wall of the tube body. The outer wall of the mounting seat is threadedly sleeved with the cover part. The cover part covers the end of the tube body, and the cover part is provided with an air inlet hole for docking with the hollow flow channel. The aperture of the air inlet hole is less than or equal to the inner diameter of the hollow flow channel.

[0014] Furthermore, it also includes a positioning pin, the inner wall of the mounting seat is slidably sleeved with the outer wall of the column body, both ends of the column body are coaxially connected to the ring end plate, and the end surface of the ring end plate is provided with two positioning notches arranged in opposite positions;

[0015] A clamping groove is provided on the inner wall of the mounting seat corresponding to the positioning notch, and two ends of the positioning pin are overlapped with the positioning notch and the clamping groove on the same side respectively.

[0016] Furthermore, the mounting seat includes a base and a positioning sleeve, the base is embedded in the side wall of the inner ring side wall or the outer ring side wall, the base is coaxially connected to the positioning sleeve, the inner wall of the positioning sleeve is provided with a card groove, the outer wall of the positioning sleeve facing one end of the base is provided with a first knife back groove, and the inner wall of the positioning sleeve is slidably sleeved with the outer wall of the column;

[0017] The cover member includes a fixing sleeve and an end cover portion. The inner wall of the fixing sleeve is threadedly connected to the outer wall of the positioning sleeve. One end of the fixing sleeve is connected to the end cover portion. An air inlet hole is provided on the side wall of the end cover portion. A second tool retreat groove is provided on the inner wall of one end of the fixing sleeve facing the end cover portion.

[0018] Furthermore, the side of the end cover portion facing the inner cavity of the receiver is coaxially connected to the flared portion.

[0019] Furthermore, the column body is made of ceramic-based material.

[0020] Compared with the prior art, the embodiments of the present invention have at least the following advantages:

[0021] 1. In the low-pollution engine of the present invention, after air is delivered to the combustion chamber through the intake duct and the compressor, it is mixed with the injected fuel. By adding a tubular body and providing a plurality of air guide holes in the side wall of the tubular body connecting the hollow flow channel with the inner cavity of the flame tube, the flow state of the airflow in the combustion chamber is improved, so that the fuel and air form more sufficient turbulence in the tubular body, increasing the contact area and mixing time between the two, thereby achieving more uniform mixing, thereby avoiding the formation of localized oil-rich or oil-lean areas in the combustion chamber, and thus improving the stability and efficiency of the combustion process in the entire combustion chamber, thereby reducing the generation of pollutants, increasing the heat energy output from the combustion chamber to the turbine, and thus improving the overall output power of the engine, and reducing the pollutant content contained in the fuel gas in the exhaust device;

[0022] 2. At the same time, on the basis of the hollow flow channel of the tubular body and the air guide hole connecting the casing and the inner cavity of the flame tube, the airflows of the inner and outer ring channels complement and adjust each other, improve the distribution of the airflow, ensure that the airflow in the combustion chamber is more uniform and stable, enable the fuel and air to be better mixed and burned, give full play to the chemical energy of the fuel, further improve the combustion efficiency of the fuel, reduce energy loss, and ensure the normal operation of the engine.

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A partial schematic diagram of a low-pollution engine according to an embodiment of the present invention is shown;

[0026] Figure 2 A schematic front view of a tubular column according to an embodiment of the present invention is shown;

[0027] Figure 3 A cross-sectional schematic diagram of a tubular column according to an embodiment of the present invention is shown;

[0028] Figure 4 shows a cross-sectional schematic diagram of a mounting base in an embodiment of the present invention;

[0029] Figure 5 A schematic top view of a mounting base according to an embodiment of the present invention is shown;

[0030] Figure 6 A cross-sectional schematic diagram of a cover member in an embodiment of the present invention is shown;

[0031] Figure 7 A schematic top view of the ring end plate, the mounting seat, and the cover member in an embodiment of the present invention is shown.

[0032] In the figure, the casing 1, the fuel nozzle 2, the flame tube 3, the end side wall 301, the inner ring side wall 302, the outer ring side wall 303, the tubular body 4, the hollow flow channel 5, the air guide hole 6, the mounting seat 7, the base 701, the positioning sleeve 702, the first undercut 703, the clamping groove 704, the sleeve cover 8, the fixing sleeve 801, the end cover part 802, the second undercut 803, the air inlet hole 804, the flaring part 805, the positioning pin 9, the ring end plate 10, and the positioning notch 11. DETAILED DESCRIPTION

[0033] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The present invention provides a low-pollution engine. Figure 1 A partial cross-sectional view of a low-pollution engine in an embodiment of the present invention is shown. Figure 1 Medium and low pollution engines include:

[0036] The casing 1 and the air inlet, compressor, combustion chamber, turbine and exhaust device connected in a front-to-back manner, wherein the compressor, combustion chamber and turbine are all accommodated in the inner cavity of the casing 1, and the combustion chamber includes a fuel nozzle 2, a flame tube 3 and a tube body 4;

[0037] The flame tube 3 includes an end side wall 301 and an inner ring side wall 302 and an outer ring side wall 303 arranged in an inner and outer ring. One end of the fuel nozzle 2 passes through the side wall of the casing 1 and is connected to the engine fuel pipeline, and the other end of the fuel nozzle 2 passes through the end side wall 301 and is connected to the inner cavity of the flame tube 3. The tubular body 4 is embedded in the flame tube 3, and the two ends of the tubular body 4 respectively pass through the inner ring side wall 302 and the outer ring side wall 303, and the tubular body 4 coaxially opens a hollow flow channel 5 connected to the inner cavity of the casing 1. The side wall of the tubular body 4 located in the inner cavity of the flame tube 3 is provided with a plurality of air guide holes 6, and the plurality of air guide holes 6 connect the hollow flow channel 5 with the inner cavity of the flame tube 3.

[0038] In actual operation of the low-pollution engine of the present application, air flows to the engine's air intake at a certain speed, and the air intake adjusts the incoming gas flow speed to an appropriate speed to adapt to the aircraft's variable flight speed; after passing through the air intake, the air enters the compressor, is compressed and transported to the combustion chamber, mixed with the injected fuel and ignited, thereby generating high-temperature and high-pressure combustion gas, releasing a large amount of heat energy to drive the turbine blades to rotate, and converting the heat energy of the combustion gas into mechanical energy. The combustion gas, after expanding and doing work in the turbine, enters the exhaust device and is discharged into the atmosphere at a certain speed and in the required direction, thereby generating thrust.

[0039] By adding a tubular body 4 and opening a plurality of air guide holes 6 in the side wall of the tubular body 4, which connect the hollow flow channel 5 with the inner cavity of the flame tube 3, the flow state of the airflow is improved, so that the fuel and air form more turbulent flow in the tubular body 4, the contact area and mixing time between the fuel and air are increased, thereby achieving more uniform mixing, thereby avoiding the formation of localized oil-rich or oil-lean areas in the combustion chamber. It should be noted that localized oil-rich areas will lead to incomplete combustion and produce a large amount of pollutants, such as carbon monoxide (CO), unburned hydrocarbons (HC), and particulate soot; while localized oil-lean areas may make the combustion unstable and even cause flameout. The tubular body 4 makes the mixing more uniform, improves the stability and efficiency of the combustion process in the entire combustion chamber, and thus reduces the generation of pollutants.

[0040] In addition, by connecting the inner and outer ring channels through the hollow flow channel 5 of the tubular body 4 and the air guide hole 6, the airflows of the inner and outer rings can complement and adjust each other, improve the distribution of the airflow, ensure that the airflow in the combustion chamber is more uniform and stable, and enable the fuel and air to be better mixed and burned, give full play to the chemical energy of the fuel, improve combustion efficiency, reduce energy loss, and ensure the normal operation of the engine.

[0041] Correspondingly, the inner ring side wall 302 and the outer ring side wall 303 are both provided with a plurality of vent holes, which connect the inner cavity of the casing 1 with the inner cavity of the flame tube 3. It should be noted that the vent holes include the cooling air film holes provided on the side walls of the existing flame tube, and other holes already provided on the original flame tube.

[0042] In this embodiment, the total area of the plurality of air guide holes 6 accounts for 55% to 65% of the total area of the plurality of ventilation holes and the plurality of air guide holes 6. For example, the total area of the plurality of air guide holes 6 accounts for 60% of the total area of the plurality of ventilation holes and the plurality of air guide holes 6, that is, the ratio of the total area of the plurality of air guide holes 6 to the total area of the plurality of ventilation holes is 6:4.

[0043] By limiting the proportion of the total area, the proportion of the total air intake of the air guide hole 6 is limited. In actual use, when the total air intake of the air guide hole 6 accounts for 55% to 65% of the total air intake of the flame tube 3, the equivalence ratio of the fuel gas is ensured to drop rapidly from about 2.0 to about 0.5, thereby reducing the pollution emissions of the combustion chamber.

[0044] It should be noted that in the actual design and use of the engine, the RTDF curve (Return Temperature Distribution Curve) is an important parameter, which reflects the gas temperature at different positions in the combustion chamber.

[0045] From the perspective of the combustion process in the engine combustion chamber, the mixed combustion of fuel and air in the combustion chamber will release a large amount of heat, causing the gas temperature in the combustion chamber to rise. The temperature of the gas at different positions will be different due to factors such as the intensity of the combustion reaction, the flow of the airflow, and the mixing effect. The RTDF curve can intuitively display these temperature distributions and thus understand the heat flow distribution in the combustion chamber.

[0046] exist Figure 2 In the example shown, the outer wall of the tubular body 4 is axially provided with a plurality of air guide hole ring groups, each of which includes a plurality of circumferentially arranged air guide holes 6. The outer wall of the tubular body 4 includes a coaxially arranged positioning ring line, and the spacing between the positioning ring line and one end of the tubular body 4 is half the spacing between the positioning ring line and the other end of the tubular body 4, and the spacing between the positioning ring line and the outer ring side wall 303 is smaller than the spacing between the positioning ring line and the inner ring side wall 302.

[0047] The total area of the air guide hole ring group increases with the increase of the distance between the air guide hole ring group and the positioning ring line.

[0048] In the design of the column 4, this application links the height and circumferential design of the air guide holes 6 to the RTDF curve. In the height direction, the total area of the air guide hole ring group is set to be the smallest at a position 2 / 3 of the height from the inner ring sidewall 302 of the column 4, that is, the mixed gas volume is minimized. The area gradually increases towards the ends. This further optimizes the airflow distribution and mixing effect within the combustion chamber, allowing the fuel and air to mix more thoroughly and allowing the external gas to cool different locations to varying degrees, thereby affecting the temperature distribution within the combustion chamber and making it more consistent with the ideal RTDF curve.

[0049] Corresponding, reference Figure 3 , with the left side as the side facing the end side wall 301, the spacing between adjacent air guide holes 6 in the circumferential direction increases with the increase of the spacing with the end side wall 301, that is, the air volume is the largest at the circumferential position facing the airflow, and gradually becomes smaller on both sides, thereby achieving an efficient cooling effect on the side facing the airflow, so as to achieve an ideal RTDF curve, and thus ensure the balance of the fuel combustion temperature distribution in the combustion chamber.

[0050] At the same time, based on the problem that high-temperature hot spots at the outlet of traditional combustion chambers seriously threaten the life of turbine components, according to different engine operating conditions, by adjusting the number and position of the air guide holes 6, while ensuring the balanced distribution of fuel combustion temperature in the combustion chamber, the outlet temperature field is precisely controlled to make the outlet temperature distribution more uniform, avoid the occurrence of high-temperature hot spots, reduce thermal stress and thermal corrosion on turbine components, extend the service life of turbine components, and improve the adaptability and flexibility of the engine.

[0051] In this embodiment, the axis of the tubular body 4 is arranged perpendicular to the axis of the flame tube 3, and the extension line of the axis of the tubular body 4 intersects with the axis of the combustion chamber, so that the length of the tubular body 4 is in the shortest state. At the same time, it avoids increasing the overall length of the combustion chamber due to the addition of the tubular body 4, limits the weight of the tubular body 4 and the engine, and when the axis of the tubular body 4 is arranged perpendicular to the axis of the flame tube 3, the mixing effect of the tubular body 4 is best.

[0052] It should be added that in this embodiment, the column body 4 is made of a ceramic-based material, and the cross-section of the column body 4 adopts a circular structure. Based on the high-temperature resistance of the ceramic-based material, it can adapt to the high-temperature environment in the quenching mixing zone and ensure the volume expansion of the column body 4 in a high-temperature environment.

[0053] Although the above description uses a circular structure as an example, the present invention is not limited thereto. The cross-section of the long tubular body 4 can adopt various forms, such as a weld waist shape, a leaf shape, etc. Those skilled in the art can comprehensively consider the principles of the present invention and actual application situations, and any suitable form can be used as long as the principles of the present invention can be implemented.

[0054] In addition, reference Figure 1 、 Figure 4 、 Figure 5 and Figure 6This embodiment further includes a mounting seat 7 and a cover 8. The side walls of the inner ring side wall 302 and the outer ring side wall 303 are both equipped with a mounting seat 7 facing the inner cavity of the casing 1. The inner wall of the mounting seat 7 is sleeved with the outer wall of the tubular body 4. The outer wall of the mounting seat 7 is threadedly sleeved with the cover 8. The cover 8 covers the end of the tubular body 4, and the cover 8 is provided with an air inlet hole 804 for docking with the hollow flow channel 5. The aperture of the air inlet hole 804 is less than or equal to the inner diameter of the hollow flow channel 5.

[0055] On the basis of the inner wall of the mounting seat 7 being sleeved with the outer wall of the tubular body 4, the position of the tubular body 4 is limited to prevent the tubular body 4 from rotating and deviating. On the basis of the cover 8 covering the end of the tubular body 4, the end of the tubular body 4 is limited to prevent the tubular body 4 from axial movement, and the communication between the hollow flow channel 5 and the inner cavity of the casing 1 is ensured through the air inlet hole 804.

[0056] In this embodiment, the inner wall of the mounting seat 7 is slidably connected with the outer wall of the column body 4. By rotating the cover 8, the cover 8 and the mounting seat 7 are separated. On the basis of the sliding connection between the inner wall of the mounting seat 7 and the outer wall of the column body 4, the column body 4 can be taken out and inserted, which facilitates the replacement and maintenance of the column body 4.

[0057] Correspondingly, in Figure 7 In the example shown, a positioning pin 9 is also included. Both ends of the tubular column 4 are coaxially connected to an annular end plate 10. The end surface of the annular end plate 10 is provided with two positioning notches 11 arranged in opposite positions.

[0058] A clamping groove 704 is formed on the inner wall of the mounting seat 7 corresponding to the positioning notch 11 , and two ends of the positioning pin 9 are overlapped with the positioning notch 11 and the clamping groove 704 on the same side respectively.

[0059] The positioning pin 9 is overlapped with the positioning notch 11 and the card slot 704 at the same time, thereby limiting the position of the positioning pin 9, the column body 4, and the mounting seat 7, so that the relative position of the column body 4 and the mounting seat 7 remains stable, avoiding circumferential rotation of the column body 4 and improving the stability of the column body 4 installed in the combustion chamber.

[0060] exist Figure 4 In the example shown, the mounting seat 7 includes a base 701 and a positioning sleeve 702. The base 701 is embedded in the side wall of the inner ring side wall 302 or the outer ring side wall 303. The base 701 is coaxially connected to the positioning sleeve 702. The inner wall of the positioning sleeve 702 is provided with a slot 704. The outer wall of the positioning sleeve 702 at one end facing the base 701 is provided with a first undercut 703. The inner wall of the positioning sleeve 702 is slidably connected to the outer wall of the tubular body 4.

[0061] exist Figure 6In the example shown, the cover member 8 includes a fixing sleeve 801 and an end cover portion 802. The inner wall of the fixing sleeve 801 is threadedly connected to the outer wall of the positioning sleeve 702. One end of the fixing sleeve 801 is connected to the end cover portion 802. An air inlet hole 804 is provided on the side wall of the end cover portion 802. A second tool retreat groove 803 is provided on the inner wall of one end of the fixing sleeve 801 facing the end cover portion 802.

[0062] The first tool-back groove 703 and the second tool-back groove 803 improve the convenience of tool-backing during the production and processing of the mounting seat 7 and the cover 8.

[0063] At the same time, the side of the end cover portion 802 facing the inner cavity of the casing 1 is coaxially connected to the flared portion 805 , and the flared portion 805 is a bell-mouth structure to improve the smoothness of the gas entering the hollow flow channel 5 .

[0064] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0065] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and may encompass internal connectivity between multiple components or interactions between multiple components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0066] In the description of the present invention, it should be understood that all terms used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and cannot be understood as a limitation on the present invention.

[0067] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-pollution engine, comprising: A casing (1) and an air inlet, a compressor, a combustion chamber, a turbine and an exhaust device connected in a front-to-rear manner, wherein the compressor, the combustion chamber and the turbine are all accommodated in the inner cavity of the casing (1), and the combustion chamber includes a fuel nozzle (2), a flame tube (3) and a tubular body (4); The flame tube (3) comprises an end side wall (301) and an inner ring side wall (302) and an outer ring side wall (303) arranged in an inner and outer ring manner. One end of the fuel nozzle (2) penetrates the side wall of the casing (1) and is connected to the engine fuel pipeline. The other end of the fuel nozzle (2) penetrates the end side wall (301) and is connected to the inner cavity of the flame tube (3). The column body (4) is embedded in the flame tube (3). The two ends of the column body (4) respectively penetrate the inner ring side wall (302) and the outer ring side wall (303). The column body (4) is coaxially provided with a hollow flow channel (5) connected to the inner cavity of the casing (1). The outer wall of the column (4) is axially provided with a plurality of air guide hole ring groups, the side wall of the column (4) located in the inner cavity of the flame tube (3) is provided with a plurality of air guide holes (6), the plurality of air guide holes (6) are connected to the hollow flow channel (5) and the inner cavity of the flame tube (3), the air guide hole ring group includes a plurality of circumferentially arranged air guide holes (6), the outer wall of the column (4) includes a coaxially arranged positioning ring line, the spacing between the positioning ring line and one end of the column (4) is half of the spacing between the positioning ring line and the other end of the column (4), and the spacing between the positioning ring line and the outer ring side wall (303) is smaller than the spacing between the positioning ring line and the inner ring side wall (302); The total area of the air guide hole ring group increases with the increase of the distance between the air guide hole ring group and the positioning ring line.

2. The low-pollution engine according to claim 1, characterized in that: The side walls of the inner ring side wall (302) and the outer ring side wall (303) are both provided with a plurality of ventilation holes, wherein the plurality of ventilation holes are connected to the inner cavity of the casing (1) and the inner cavity of the flame tube (3), and the total area of the plurality of air guide holes (6) accounts for 55% to 65% of the total area of the plurality of ventilation holes and the plurality of air guide holes (6).

3. The low-pollution engine according to claim 1, characterized in that: The air guide hole ring group comprises a plurality of circumferentially arranged air guide holes (6), and the spacing between adjacent air guide holes (6) increases with the increase in the spacing from the end side wall (301).

4. The low-pollution engine according to claim 3, characterized in that: The axis of the tube column (4) is arranged perpendicular to the axis of the flame tube (3), and an extension line of the axis of the tube column (4) intersects with the axis of the combustion chamber.

5. The low-pollution engine according to any one of claims 1 to 3, characterized in that: The invention also includes a mounting seat (7) and a cover member (8), wherein the side walls of the inner ring side wall (302) and the outer ring side wall (303) are both provided with a mounting seat (7) facing the inner cavity of the casing (1), the inner wall of the mounting seat (7) is sleeved with the outer wall of the tubular body (4), the outer wall of the mounting seat (7) is threadedly sleeved with the cover member (8), the cover member (8) covers the end of the tubular body (4), and the cover member (8) is provided with an air inlet hole (804) for docking with the hollow flow channel (5), and the aperture of the air inlet hole (804) is less than or equal to the inner diameter of the hollow flow channel (5).

6. The low-pollution engine according to claim 5, characterized in that: It also includes a positioning pin (9), the inner wall of the mounting seat (7) is slidably sleeved with the outer wall of the column body (4), both ends of the column body (4) are coaxially connected to the ring end plate (10), and the end surface of the ring end plate (10) is provided with two positioning notches (11) arranged in a counter-positioned manner; A clamping groove (704) is provided on the inner wall of the mounting seat (7) corresponding to the positioning notch (11), and both ends of the positioning pin (9) are overlapped with the positioning notch (11) and the clamping groove (704) on the same side.

7. The low-pollution engine according to claim 6, characterized in that: The mounting seat (7) includes a base (701) and a positioning sleeve (702), wherein the base (701) is embedded in the side wall of the inner ring side wall (302) or the outer ring side wall (303), the base (701) is coaxially connected to the positioning sleeve (702), the inner wall of the positioning sleeve (702) is provided with a card slot (704), the outer wall of the positioning sleeve (702) facing one end of the base (701) is provided with a first knife-back groove (703), and the inner wall of the positioning sleeve (702) is slidably sleeved with the outer wall of the tubular column (4); The cover member (8) comprises a fixing sleeve (801) and an end cover portion (802); the inner wall of the fixing sleeve (801) is threadedly sleeved with the outer wall of the positioning sleeve (702); one end of the fixing sleeve (801) is connected to the end cover portion (802); an air inlet hole (804) is provided on the side wall of the end cover portion (802); and a second knife-back groove (803) is provided on the inner wall of one end of the fixing sleeve (801) facing the end cover portion (802).

8. The low-pollution engine according to claim 7, characterized in that: The side of the end cover portion (802) facing the inner cavity of the casing (1) is coaxially connected to the flared portion (805).

9. The low-pollution engine according to claim 1, characterized in that: The tubular column (4) is made of ceramic-based material.

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