Flame tube and engine

Abstract

The present application relates to a kind of flame tube and engine, wherein, flame tube includes inner ring and outer ring, connection part is arranged between inner ring and outer ring, multiple vortex sheets are arranged on connection part by bending, vortex sheet and connection part form vortex port for air intake between them, the direction of air intake of vortex port is not parallel with the direction of vortex port pointing to inner ring axis.The flame tube and engine of the present application, in order to form a whole ring vortex between inner ring and outer ring, no longer set up vortex flow device with relatively complex structure on flame tube, or set up jet pipe, but directly process vortex sheet on flame tube by bending process, vortex sheet and connection part form vortex port for air intake between them, form a whole ring vortex between inner ring and outer ring by having the direction of air intake of vortex port, not only can improve the temperature uniformity of combustion zone in flame tube, but also can simplify the structure of flame tube, reduce the weight of flame tube.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft, and in particular to a flame tube, an engine and a helicopter. Background Art

[0002] With the continuous increase in the pressure ratio and temperature rise of gas turbine engines, and due to the relaxation of fuel regulations for gas turbine engines, problems such as smoke, carbon deposits, and high wall temperatures in the combustion chamber have become particularly serious. The development of high-performance engines has placed higher demands on the fuel supply system: complete combustion within a shorter combustion zone to shorten the combustion chamber length and reduce its weight; higher requirements for ignition performance and lean flameout range; and lower pollutant emissions to meet the low-pollution emission requirements of future aviation gas turbines.

[0003] The current flame tube and evaporation tube design is based on a multi-ring vortex main combustion zone design. The local high temperature is relatively large, the fuel stays in the combustion chamber for a short time, and the mixing effect with the air is not obvious, which easily leads to incomplete combustion, high fuel consumption, and NO X High emissions and smoke generation place stringent demands on the materials and design of the evaporator tube. Due to the limitations of flame tube design, current evaporator tubes are too short, mostly straight and L-shaped. A few spiral tubes are also distributed along an axis, with the main combustion zone of the flame tube distributed as multiple independent ring vortices. A technical solution has emerged: forming a single, integrated ring vortex within the main combustion zone of the flame tube. This solution can effectively solve these technical problems, but the flame tube structure for this solution is relatively complex, resulting in a high weight. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a flame tube, which can simplify the structure of the flame tube and reduce the weight of the flame tube.

[0005] On the one hand, the present invention provides a flame tube, comprising an inner ring and an outer ring, a connecting portion is provided between the inner ring and the outer ring, a plurality of vortex sheets formed by bending are provided on the connecting portion, a vortex port for air intake is formed between the vortex sheets and the connecting portion, and the air intake direction of the vortex port is not parallel to the direction of the vortex port pointing to the axis of the inner ring.

[0006] In one embodiment of the present invention, a vortex cavity is formed between the inner ring, the outer ring and the connecting portion, and the vortex port is communicated with the vortex cavity.

[0007] In one embodiment of the present invention, the vortex sheet is bent along the axis of the inner ring in a direction away from the vortex chamber, one end of the vortex sheet close to the inner ring is connected to the connecting portion, and the vortex mouth is formed between one end of the vortex sheet close to the outer ring and the connecting portion.

[0008] In one embodiment of the present invention, the vortex sheet is bent along the axis of the inner ring in a direction close to the vortex cavity, one end of the vortex sheet close to the outer ring is connected to the connecting portion, and the vortex mouth is formed between one end of the vortex sheet close to the inner ring and the connecting portion.

[0009] In one embodiment of the present invention, the plurality of swirl sheets are arranged in a clockwise spiral array or a counterclockwise spiral array around the axis of the flame tube.

[0010] In one embodiment of the present invention, the position where the vortex sheet is closest to the inner ring is the pericenter, the line connecting the pericenter and the axis of the inner ring forms a connecting line, the intersection of the connecting line and the inner wall of the inner ring is the intersection point, and the angle between the tangent formed by the inner ring at the intersection and the projection of the intake direction of the vortex port where the vortex sheet is located on the first plane is 30° to 75°, and the first plane is a plane perpendicular to the axis of the inner ring.

[0011] In one embodiment of the present invention, a fuel nozzle is provided on the circumferential side of the flame tube, and the fuel nozzle includes a fuel nozzle head and a fuel nozzle tail, and the fuel nozzle head extends into the vortex chamber.

[0012] In one embodiment of the present invention, the included angle between the projection of the injection direction of the fuel nozzle and the intake direction of the adjacent vortex port on the first plane is 30° to 90°, and the first plane is a plane perpendicular to the inner ring axis.

[0013] In one embodiment of the present invention, a mixing hole is provided on the outer ring of the flame tube, and the mixing hole extends into the vortex cavity to form a jet tube.

[0014] On the other hand, an engine is provided, comprising the flame tube described above.

[0015] The above technical solution of the present invention has the following advantages over the prior art:

[0016] In order to form an integral annular vortex between the inner ring and the outer ring, the flame tube and the engine described in the present invention no longer require a vortex finder with a more complex structure or a jet tube. Instead, vortex sheets are directly processed on the flame tube through a cutting and bending process. A vortex port for air intake is formed between the vortex sheet and the connecting part. An integral annular vortex is formed between the inner ring and the outer ring through the vortex port with an air intake direction. This not only improves the temperature uniformity in the combustion chamber, but also simplifies the structure of the flame tube and reduces the weight of the flame tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only 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.

[0018] Figure 1 It is a structural schematic diagram of the flame tube of the present invention;

[0019] Figure 2 is a first cross-sectional view of the flame tube of the present invention;

[0020] Figure 3 is a second cross-sectional view of the flame tube of the present invention;

[0021] Figure 4 It is a partial schematic diagram of the vortex sheet and vortex port of the flame tube of the present invention;

[0022] Figure 5 Schematic cutaway view of the vortex sheet of the flame tube of the present invention;

[0023] Figure 6 This is a schematic structural diagram of the flame tube of the present invention at a first angle;

[0024] Figure 7 It is a structural schematic diagram of the flame tube at a second angle of the present invention.

[0025] Description of the accompanying drawings:

[0026] 1. Inner ring; 2. Outer ring; 3. Connecting part; 4. Vortex plate; 5. Vortex port; 6. Vortex cavity; 7. Fuel nozzle; 8. Jet tube; 9. Bird's beak structure; 10. Bending axis; 11. Bending area; 12. First reference line; 13. Second reference line; 14. Main combustion hole; 15. Mixing hole.

[0027] Example 1

[0028] To make the objectives, technical solutions, and advantages 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 of 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.

[0029] Reference Figure 1As shown, the flame tube of the present invention includes an inner ring 1 and an outer ring 2, a connecting portion 3 is provided between the inner ring 1 and the outer ring 2, a plurality of vortex sheets 4 formed by bending are provided on the connecting portion 3, a vortex port 5 for air intake is formed between the vortex sheets 4 and the connecting portion 3, and the air intake direction of the vortex port 5 is not parallel to the direction of the vortex port 5 pointing to the axis of the inner ring 1.

[0030] In order to reduce the weight of the flame tube and simplify the structure of the flame tube while ensuring the performance of the flame tube, the present invention proposes a new type of flame tube, which includes an inner ring 1 and an outer ring 2. The inner ring 1 and the outer ring 2 are both cylindrical. The outer ring 2 is sleeved on the outer edge of the inner ring 1, and the inner ring 1 and the outer ring 2 are coaxially arranged. A bird's beak structure 9 is formed on one of the same side ends of the inner ring and the outer ring 2 of the flame tube. The bird's beak structure 9 is used to connect the flame tube to the turbine inlet guide (not shown in the figure) on the engine, and the bird's beaks on the inner ring and the outer ring form a double bird's beak design. The double bird's beak fixed design structure can effectively increase the vibration resistance of the flame tube and extend the service life of the flame tube; a connecting portion 3 is provided on the other same side end of the inner ring and the outer ring 2 of the flame tube. The connecting portion 3 connects the inner ring 1 and the outer ring 2, so that the inner ring 1 and the outer ring 2 form a whole. A vortex mouth 5 is provided on the connecting portion 3, and the vortex mouth 5 is used for air intake, so that an integral ring vortex is formed between the inner ring 1 and the outer ring 2 to ensure the linked flame and improve the temperature uniformity in the combustion chamber. Among them, the flame tube no longer uses a vortex finder with a more complex structure, or a jet tube is set, but is directly made on the connecting portion 3 through a cutting and bending process, which can not only form an integral ring vortex, but also reduce the overall weight of the flame tube. Furthermore, in order to make the gas flowing through the vortex mouth 5 form an integral annular vortex between the inner ring 1 and the outer ring 2, the air intake direction of the vortex mouth 5 cannot be along the direction of the vortex mouth 5 pointing to the axis of the inner ring 1, that is, the air intake direction of the vortex mouth 5 is not parallel to the direction of the vortex mouth 5 pointing to the axis of the inner ring 1. If the air intake direction of the vortex mouth 5 is along the direction of the vortex mouth 5 pointing to the axis of the inner ring 1, then the gas flowing through the vortex mouth 5 directly flows vertically to the inner wall of the flame tube, resulting in the gas flowing through the vortex mouth 5 unable to form an integral annular vortex between the inner ring 1 and the outer ring 2, and the temperature uniformity of the combustion zone in the flame tube cannot be improved.

[0031] In order to form an integral annular vortex between the inner ring 1 and the outer ring 2, the flame tube of the present invention no longer has a vortex finder with a more complex structure or a jet tube, but directly processes a vortex sheet 4 on the flame tube through a bending process. Compared with the existing processing technology of punching and welding vortex sheets on the flame tube, the processing technology of the present application is simple, and no additional welding parts are required to complete the configuration of the vortex sheet. The welded vortex sheet will cause the flame tube head to deform during welding, and the solder will increase the weight of the entire flame tube; a vortex port 5 for air intake is formed between the vortex sheet 4 and the connecting portion 3. After the air flow enters the flame tube head (the end of the flame tube where the connecting portion is set is called the flame tube head) through the vortex port 5 with an air intake direction, an air film will be formed on the wall of the flame tube head to cool the flame tube head, and at the same time, the intake air flow of the main combustion hole is guided to form an integral annular vortex between the inner ring and the outer ring, which can not only improve the temperature uniformity of the combustion zone in the flame tube, but also simplify the structure of the flame tube and reduce the weight of the flame tube. In addition, the vortex head design of the flame tube forms a vortex recirculation zone near the head area inside the entire flame tube, which can effectively reduce the number of fuel nozzles, improve the cross-flame capability, and simplify the engine structure.

[0032] In one embodiment, a vortex cavity 6 is formed between the inner ring 1 , the outer ring 2 and the connecting portion 3 , and the vortex port 5 is in communication with the vortex cavity 6 .

[0033] like Figure 2 As shown, one of the ends on the same side of the inner ring 1 is connected by a connecting portion 3, so a vortex chamber 6 is formed between the inner ring 1, the outer ring 2 and the connecting portion 3. The vortex chamber 6 is connected to the air inlet, so the gas flowing through the air inlet enters the vortex chamber 6. Specifically, the fuel flows into the nozzle from the oil inlet pipe, and the nozzle atomizes the fuel and sprays it into the vortex chamber 6 of the flame tube; at the same time, the air flow through the two channels formed by the inner shell of the casing (not shown in the figure) and the flame tube shell (outer ring 2) passes through the vortex port 5. Since the vortex port 5 has an air intake direction, the air flow from the air inlet generates a recirculation zone in the vortex chamber 6. The recirculation zone will drive the fuel sprayed from the nozzle to the vortex chamber 6 to flow with the recirculation of air, which can make the fuel more evenly distributed in the vortex chamber 6, so as to improve the temperature uniformity of the combustion zone in the flame tube. The air flow direction is as follows: Figure 2 and Figure 3 As indicated by the arrow.

[0034] In one embodiment, the vortex sheet 4 is bent along the axis of the inner ring 1 in a direction away from the vortex chamber 6, and the end of the vortex sheet 4 close to the inner ring 1 is connected to the connecting part 3, and the vortex mouth 5 is formed between the end of the vortex sheet 4 close to the outer ring 2 and the connecting part 3.

[0035] There are two ways to process the eddy current sheet 4. The first is as follows: Figure 1 and Figure 4 As shown, the vortex sheet 4 is cut and bent along the axis of the inner ring 1 in a direction away from the vortex cavity 6. At this time, the vortex sheet 4 protrudes from the connecting portion 3 along the axis of the inner ring 1 in a direction away from the vortex cavity 6. Specifically, the vortex sheet 4 is rectangular in shape. The processing process is as follows: first determine the processing position of the vortex sheet 4 and the intake direction of the vortex port 5, and then use laser cutting to process three fine slits on the connecting portion 3 of the flame tube according to the position of the vortex port 5 and the intake direction. Figure 5 As shown, the width W of the three slits is 0.1mm~1.5mm, preferably 1mm, and the three slits correspond to the two short sides and one long side of the rectangular vortex sheet 4. The long side of the uncut slit serves as the connecting structure between the vortex sheet 4 and the connecting portion 3. Finally, the long side of the uncut slit is used as the bending axis 10, and the bending area 11 surrounded by the two short sides and the long side of the cut slit is bent around the bending axis 10 along the axis of the inner ring 1 in the direction away from the vortex chamber 6. After bending, the long side formed by the cut slit on the vortex sheet 4 is the first reference line 12, and the long side formed by the cut slit on the vortex port 5 where the vortex sheet 4 is located is the second reference line 13. The distance L between the first reference line 12 and the second reference line 13 is 1mm~5mm, preferably 3mm. The vortex port 5 of this size can effectively generate a recirculation zone in the vortex chamber 6, thereby forming an integral ring vortex, as shown in FIG. Figure 3 As shown by the circular arrow in the vortex chamber 6, in this embodiment, the vortex sheet 4 is cut and bent along the axis of the inner ring 1 in a direction away from the vortex chamber 6. At this time, the vortex sheet 4 protrudes from the connecting portion 3 along the axis of the inner ring 1 in a direction away from the vortex chamber 6. Therefore, the long side of the vortex sheet 4 close to the inner ring 1 is the side without the slit and serves as the bending axis 10. The bending area 11 formed by the two short sides and the long side close to the outer ring 2 with the slit is bent around the bending axis 10 in a direction away from the vortex chamber 6.

[0036] In one embodiment, the vortex sheet 4 is bent along the axis of the inner ring 1 in a direction close to the vortex chamber 6, and the end of the vortex sheet 4 close to the outer ring 2 is connected to the connecting part 3, and the vortex mouth 5 is formed between the end of the vortex sheet 4 close to the inner ring 1 and the connecting part 3.

[0037] The vortex sheet 4 can be processed in two ways. The second method is to cut and bend the vortex sheet 4 along the axis of the inner ring 1 toward the vortex chamber 6. In this case, the vortex sheet 4 protrudes from the connecting portion 3 along the axis of the inner ring 1 toward the vortex chamber 6. The bending process is the same as the first method, except that in this embodiment, the long side of the vortex sheet 4 near the outer ring 2 is not cut with a slit and serves as the bending axis. The bending area formed by the two short sides and the long side near the inner ring 1 with a slit is bent around the bending axis toward the vortex chamber 6.

[0038] In one embodiment, the plurality of swirl sheets 4 are arranged in a clockwise spiral array or a counterclockwise spiral array around the axis of the flame tube.

[0039] like Figure 1 As shown, multiple vortex sheets 4 are arranged in a clockwise spiral array around the axis of the flame tube. The angles between two adjacent vortex sheets 4 on the flame tube are consistent. The end of the vortex sheet 4 close to the inner ring 1 is called the head end, and the end close to the outer ring 2 is called the tail end. The two adjacent vortex sheets 4 are arranged head to tail, that is, the tail end of the vortex sheet 4 on the left is close to the head end of the vortex sheet 4 on the right. The multiple vortex sheets 4 cooperate with each other so that the airflow in the vortex chamber 6 forms an overall ring vortex in the clockwise direction. In addition, the multiple vortex sheets 4 can also be arranged in a counterclockwise spiral array around the axis of the flame tube. At this time, the overall ring vortex formed is in the counterclockwise direction.

[0040] In one embodiment, the position of the vortex sheet 4 closest to the inner ring 1 is the pericenter, the line connecting the pericenter and the axis of the inner ring 1 forms a connecting line, the intersection of the connecting line and the inner wall of the inner ring 1 is the intersection point, and the angle between the tangent formed by the inner ring 1 at the intersection and the projection of the intake direction of the vortex port 5 where the vortex sheet 4 is located on the first plane is 30° to 75°, and the first plane is a plane perpendicular to the axis of the inner ring 1.

[0041] In order to facilitate the expression of the angle of the intake direction, the plane perpendicular to the axis of the inner ring 1 is defined as the first plane, the position of the vortex sheet 4 closest to the inner ring 1 is the pericenter, which is equivalent to the vertex of the rectangular vortex sheet 4 close to the inner ring 1, and the line connecting the vertex and the axis of the inner ring 1 is the centerline. The centerline and the inner wall of the inner ring 1 will produce an intersection, and the tangent of the inner ring 1 passing through the intersection is determined. Then the angle between the intake direction of the vortex port 5 where the vortex sheet 4 is located and the projection of the tangent on the first plane is 30° to 75°, preferably 50°. This angle is the first angle. Figure 6 As shown, at this angle, the airflow flowing through the vortex port 5 and entering the vortex cavity 6 can form an integral annular vortex in the vortex cavity 6 with maximum efficiency, thereby improving the temperature uniformity in the combustion chamber.

[0042] In one embodiment, a fuel nozzle 7 is provided on the circumferential side of the flame tube. The fuel nozzle 7 includes a fuel nozzle head and a fuel nozzle tail. The fuel nozzle head extends into the vortex chamber 6 .

[0043] The fuel nozzle 7 comprises a fuel nozzle head and a fuel nozzle tail, the fuel nozzle tail is connected with a fuel pipe, fuel is delivered into the fuel nozzle 7 through the fuel pipe, after the fuel is atomized and sprayed, the fuel is sprayed to the vortex chamber 6 on the flame tube through the fuel nozzle head, therefore the fuel nozzle head extends into the vortex chamber 6, so that the atomized and sprayed fuel ignites and burns in the vortex chamber 6.

[0044] In one embodiment, the angle between the injection direction of the fuel nozzle 7 and the air inlet direction of the vortex port 5 adjacent to the fuel nozzle 7 is 30°-90°.

[0045] A plane perpendicular to the axis of the inner ring 1 is defined as the first plane, the fuel sprayed by the fuel nozzle 7 has a certain injection direction, which forms a spray cone angle, the direction along the axis of the spray cone angle is taken as the injection direction of the fuel nozzle 7, the angle between the projection of the air inlet direction of the vortex port 5 adjacent to the fuel nozzle 7 and the projection of the injection direction of the fuel nozzle 7 on the first plane is 30°-90°, preferably 60°, the angle is a second angle, as shown in Figure 7 The length direction of the vortex sheet 4 and the projection of the injection direction on the first plane form an angle less than 60°, under this angle, the mixed gas and fuel can effectively form an integrated annular vortex, so as to further improve the temperature uniformity of the combustion zone in the flame tube. In addition, the air inlet direction of the vortex port 5 on the head of the flame tube is matched with the injection direction of the fuel nozzle 7, fuel is supplied into the combustion zone in the flame tube through multi-point injection of the fuel nozzle 7, and is uniformly distributed in the combustion backflow zone, so that the residence time of the fuel in the flame tube is long, the flame is stable, the combustion is complete, the combustion efficiency is improved, the maximum temperature inside the combustion zone is reduced, the local high temperature zone is reduced, the outlet temperature field of the combustion chamber is improved, which is beneficial to prolong the service life of the combustion chamber and turbine parts, reduce the material heat resistance requirement of the combustion chamber and turbine parts, improve the economy of the engine, at the same time, the exhaust smoke is less, the NO X emission is low, so that the engine meets higher low-pollution emission requirements.

[0046] In one embodiment, the outer ring of the flame tube is provided with a mixing hole 15, the mixing hole 15 extends into the vortex chamber 6 to form a jet pipe 8.

[0047] Both the inner ring 1 and the outer ring 2 are provided with main combustion holes 14 and mixing holes 15. Multiple main combustion holes 14 are located on the end of the inner ring 1 and the outer ring 2 near the connection 3, while multiple mixing holes 15 are located on the end of the inner ring 1 and the outer ring 2 away from the connection 3. Both the main combustion holes 14 and the mixing holes 15 serve as air intakes. The air intake of the main combustion holes 14 on the inner ring 1 and the outer ring 2 accounts for approximately 20% to 40% of the total air volume in the combustion chamber, while the air intake of the mixing holes 15 on the inner ring 1 and the outer ring 2 accounts for approximately 20% to 40% of the total air volume in the combustion chamber. Air enters the flame tube through the main combustion holes 14 for combustion. Air passing through the mixing holes 15 mixes with the combustion gas in the flame tube, lowering the temperature of the combustion gas and controlling the temperature distribution at the combustion chamber outlet to meet turbine requirements. In this embodiment, a portion of the airflow enters the flame tube from the main combustion holes 14 of the outer ring 2 and the main combustion holes 14 of the flame tube ring, and a portion of the airflow is ejected into the flame tube head through the vortex port 5 of the flame tube. A vortex recirculation zone is formed near the head area inside the entire flame tube. At the same time, the mixed flow of fuel and air is ejected from the nozzle on the fuel nozzle 7. The fuel is evenly distributed in the recirculation zone. After ignition, the combustion is organized and a cross flame is quickly formed. A portion of the remaining gas is mixed with the post-combustion gas through the mixing holes 15 of the flame tube ring and the mixing holes 15 of the flame tube ring. To ensure the mixing effect, the mixing holes 15 of the outer ring 2 extend into the vortex cavity 6 to form a jet tube 8. The direction of the jet tube 8 is consistent with the air inlet direction of the vortex port 5. This jet tube 8 plays an auxiliary role, mainly relying on the vortex port 5 formed by the vortex sheet 4 to generate an overall vortex.

[0048] In one embodiment, the inner ring 1 and the outer ring 2 are provided with diverging holes, and the diameter of the diverging holes is 0.2 mm to 1.0 mm.

[0049] The entire flame tube is cooled by diverging holes (i.e., diverging holes are provided on the wall surfaces of the inner ring 1 and the outer ring 2, not shown in the figure). The air intake of the diverging holes accounts for approximately 10% to 30% of the total air volume of the combustion chamber. The aperture of the diverging holes is 0.2 mm to 1.0 mm, preferably 0.5 mm. According to the gas distribution design, they are evenly distributed on the wall of the vortex cavity 6 on the flame tube. The diverging holes can cool the wall of the inner ring 1 and the outer ring 2 to prevent the wall temperature of the outer ring 2 and the inner ring 1 from being too high under the combustion of gas, thereby reducing the life of the flame tube.

[0050] Example 2

[0051] An engine is provided, comprising the above-mentioned flame tube, wherein the flame tube comprises an inner ring 1 and an outer ring 2, a connecting portion 3 is provided between the inner ring 1 and the outer ring 2, a plurality of vortex sheets 4 formed by bending are provided on the connecting portion 3, a vortex port 5 for air intake is formed between the vortex sheets 4 and the connecting portion 3, and an air intake direction of the vortex port 5 is not parallel to the direction of the vortex port 5 pointing to the axis of the inner ring 1.

[0052] In order to form an integral annular vortex between the inner ring 1 and the outer ring 2, the flame tube on the engine of the present invention no longer has a vortex finder with a more complex structure or a jet tube. Instead, a vortex sheet 4 is directly processed on the flame tube through a bending process, and a vortex port 5 for air intake is formed between the vortex sheet 4 and the connecting part 3. An integral annular vortex is formed between the inner ring 1 and the outer ring 2 through the vortex port 5 with an air intake direction. This not only improves the temperature uniformity in the combustion chamber, but also simplifies the structure of the flame tube, reduces the weight of the flame tube, and thus reduces the weight of the engine.

[0053] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A flame tube, characterized in that: The invention comprises an inner ring (1) and an outer ring (2), wherein a connecting portion (3) is provided between the inner ring (1) and the outer ring (2), and a plurality of vortex sheets (4) formed by bending are provided on the connecting portion (3), and a vortex port (5) for air intake is formed between the vortex sheet (4) and the connecting portion (3), and the air intake direction of the vortex port (5) is not parallel to the direction in which the vortex port (5) points to the axis of the inner ring (1); the air flow enters the flame tube head through the vortex port (5) with the air intake direction, and the air flow of the main combustion hole is guided to form an integral annular vortex between the inner ring (1) and the outer ring (2); the position of the vortex sheet (4) closest to the inner ring (1) is the pericenter, and the line connecting the pericenter and the axis of the inner ring (1) forms a connecting line, and the intersection of the connecting line and the inner wall of the inner ring (1) is the intersection point, and the inner ring (1) is at the position of the inner ring (1). The angle between the tangent formed at the intersection and the projection of the air intake direction of the vortex port (5) where the vortex sheet (4) is located on the first plane is 30° to 75°, and the first plane is a plane perpendicular to the axis of the inner ring (1); a fuel nozzle (7) is provided on the circumferential side of the flame tube, and the angle between the injection direction of the fuel nozzle (7) and the projection of the air intake direction of the adjacent vortex port (5) on the first plane is 30° to 90°; the long side formed by the fine slit cut on the vortex sheet (4) is the first reference line (12), and the long side formed by the fine slit cut on the vortex port (5) where the vortex sheet (4) is located is the second reference line (13), and the distance L between the first reference line (12) and the second reference line (13) is 1mm to 5mm; the air flow enters the flame tube head through the vortex port (5) with the air intake direction and forms an air film on the wall of the flame tube head.

2. The flame tube according to claim 1, characterized in that: A vortex cavity (6) is formed between the inner ring (1), the outer ring (2) and the connecting portion (3), and the vortex port (5) is in communication with the vortex cavity (6).

3. The flame tube according to claim 2, characterized in that: The vortex sheet (4) is bent along the axis of the inner ring (1) in a direction away from the vortex chamber (6), and one end of the vortex sheet (4) close to the inner ring (1) is connected to the connecting portion (3), and the vortex port (5) is formed between one end of the vortex sheet (4) close to the outer ring (2) and the connecting portion (3).

4. The flame tube according to claim 2, characterized in that: The vortex sheet (4) is bent along the axis of the inner ring (1) in a direction close to the vortex cavity (6), and one end of the vortex sheet (4) close to the outer ring (2) is connected to the connecting portion (3), and the vortex port (5) is formed between the end of the vortex sheet (4) close to the inner ring (1) and the connecting portion (3).

5. The flame tube according to claim 3 or 4, characterized in that: The plurality of vortex sheets (4) are arranged in a clockwise spiral array or a counterclockwise spiral array around the axis of the flame tube.

6. The flame tube according to claim 2, characterized in that: The fuel nozzle (7) comprises a fuel nozzle head and a fuel nozzle tail, and the fuel nozzle head extends into the vortex chamber (6).

7. The flame tube according to claim 2, characterized in that: A mixing hole (15) is provided on the outer ring of the flame tube, and the mixing hole (15) extends into the vortex cavity (6) to form a jet tube (8).

8. An engine, characterized in that: It comprises the flame tube as described in any one of claims 1 to 7.

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