Combustion chamber and aero-engine

Abstract

The invention relates to the technical field of aero-engines, and discloses a combustion chamber and an aero-engine, the combustion chamber is characterized in that a flame tube is internally provided with a working cavity and comprises an outer ring part, the outer ring part is internally provided with a conveying cavity, the outer wall of the outer ring part is provided with a plurality of mounting positions, and mounting ports and oil spraying holes are formed in the mounting positions; the multiple evaporation assemblies are arranged in one-to-one correspondence with the mounting positions, evaporation cavities are formed in the evaporation assemblies, and oil inlets and oil outlets are formed in the outer walls of the evaporation assemblies. The evaporation assemblies are arranged on the outer side of the flame tube at intervals, so that the single evaporation assembly is simpler in structure and convenient to manufacture, and meanwhile, the difficulty of connection between the single evaporation assembly and the flame tube is low; the conveying cavity is located in the outer ring part of the flame tube, compared with the mode that the conveying cavity is located in the evaporation assembly, the manufacturing difficulty of the evaporation assembly can be remarkably reduced, meanwhile, the conveying cavity structure formed in the outer ring part is more stable and reliable, the structures of all parts of the combustion chamber are simpler, manufacturing is convenient, and meanwhile the assembling difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and particularly to a combustion chamber and an aero-engine. Background Art

[0002] For an aero-engine combustion chamber, fuel atomization is one of the important processes, which will have an obvious impact on the ignition and extinction boundaries of the flame tube and the outlet temperature distribution. In the existing technology of fuel injection and atomization through a direct injection nozzle, due to its poor atomization effect and the spray cone angle and atomization fineness are difficult to meet the usage requirements under various working conditions, it is gradually being replaced by an evaporation tube structure with multiple outlets.

[0003] Currently, the existing evaporation tube structure usually consists of an annular evaporation kit and a flame tube. The evaporation kit has an annular mixing chamber inside. A part of the structure of the evaporation kit is fixed to the outer wall of the flame tube, and then a plurality of evaporation chambers are enclosed. Although this form of evaporation tube structure can better achieve fuel atomization, due to its relatively complex structure, during the actual manufacturing process, its components are difficult to process, and the finished product after assembly also has problems of poor usage reliability. Summary of the Invention

[0004] In view of this, the present invention provides a combustion chamber to solve the problems that the existing evaporation tube structure is complex and difficult to manufacture and assemble.

[0005] In a first aspect, the present invention provides a combustion chamber, including: a flame tube, which is annularly arranged and has a working chamber inside. Along its radial direction, the flame tube includes an outer ring part located outside the working chamber. The outer ring part has a conveying chamber extending in the circumferential direction inside. The outer wall of the outer ring part has a plurality of mounting positions, and the plurality of mounting positions are arranged at intervals along the circumferential direction. Each mounting position is provided with a mounting port and an oil injection hole. The mounting port is communicated with the working chamber, and the oil injection hole is communicated with the conveying chamber; a plurality of evaporation components, which are arranged in one-to-one correspondence with the mounting positions and are fixedly connected to the outer wall of the outer ring part. Each evaporation component has an evaporation chamber inside. The outer wall of the evaporation component is provided with an oil inlet and an oil outlet respectively communicated with the evaporation chamber. The oil injection hole is communicated with the evaporation chamber through the oil inlet, and the oil outlet is communicated with the working chamber through the mounting port.

[0006] Beneficial effects: The evaporation components are arranged at intervals outside the flame tube. The structure of a single evaporation component is simpler, which is convenient for manufacturing and has a lower connection difficulty with the flame tube. In addition, the conveying chamber is located inside the outer ring part of the flame tube. Compared with the conveying chamber being located in the evaporation component, it can not only significantly reduce the manufacturing difficulty of the evaporation component, but also the conveying chamber formed inside the outer ring part is more stable and reliable. The structures of the components of the combustion chamber are simpler, which is convenient for manufacturing and also reduces the assembly difficulty, effectively solving the problems that the existing evaporation tube structure is complex and difficult to manufacture and assemble.

[0007] In an alternative embodiment, the flame tube further includes an inner ring portion located inside the outer ring portion, and connecting portions located at both axial ends of the outer ring portion. The two axial ends of the outer ring portion are respectively connected to the inner ring portion through the connecting portions, thereby enclosing a working chamber; the outer ring portion includes a first outer ring segment and a second outer ring segment along the axis. The portion of the first outer ring segment close to the second outer ring segment forms a first connecting segment, and the portion of the second outer ring segment close to the first outer ring segment forms a second connecting segment. The first connecting segment and the second connecting segment are overlapped, and the two enclose a conveying chamber.

[0008] Beneficial effects: The flame tube is integrally designed in a segmented manner, which is convenient for processing and manufacturing. In addition, the outer ring portion is designed in a segmented manner. The first connecting segment and the second connecting segment overlap to form a conveying chamber. The two can be manufactured separately and the contact surface at the connecting position is large, which can not only significantly reduce the difficulty of forming the conveying chamber, but also effectively improve the connection reliability and stability of the first connecting segment and the second connecting segment.

[0009] In an alternative embodiment, the first outer ring segment is located inside the second outer ring segment, and both the fuel injection holes and the mounting ports are located in the second outer ring segment; the first outer ring segment has a first protrusion extending circumferentially and protruding inward, and the space between the first protrusion and the inner wall of the second outer ring segment forms a conveying chamber; and / or, the second outer ring segment is provided with a second protrusion corresponding to each mounting position, the second protrusion extends into the evaporation chamber through the fuel inlet, and the fuel injection holes at the mounting positions are arranged on the second protrusion.

[0010] Beneficial effects: For the first outer ring segment in this form, the space of the conveying chamber can be formed by its own first protrusion. The structure is simple, reliable and convenient for processing and manufacturing, making the outer wall of the second outer ring segment relatively flat and more convenient for connecting the evaporation assembly. In addition, by applying the protrusion in this form, the fuel injection holes can enter the evaporation chamber, which can effectively prevent the fuel at the fuel injection holes from spraying onto the inner wall of the fuel inlet and improve the fuel injection reliability at the fuel injection holes.

[0011] In an alternative embodiment, the evaporation assembly includes a main body and an extending pipe that are internally connected. The main body has an evaporation chamber and a fuel inlet, and the extending pipe has an oil outlet. At least a part of the extending pipe enters the working chamber through the mounting port; the side of the main body close to the flame tube has a heat exchange surface, and the main body is attached to the outer wall of the outer ring portion through the heat exchange surface; and / or, the part of the extending pipe extending into the working chamber has a composite deflection angle, and the range of the axial deflection angle of this part is 45° to 60° and the range of the circumferential deflection angle is 50° to 70°.

[0012] Beneficial effects: The heat exchange surface of the main pipe body conforms to the shape of the outer wall surface of the outer ring part. On the one hand, it is convenient to fill the filler metal, and the evaporation assembly can be firmly welded to the flame tube by brazing. On the other hand, it increases the contact area with the wall surface of the flame tube, which is beneficial to absorbing the combustion heat in the flame tube and enhancing the evaporation effect of the fuel oil inside the evaporation assembly. In addition, for this form of extension pipe, when the oil-gas mixture flows through the oil outlet, a certain acceleration effect can be obtained to avoid backflow. The extension pipe is designed in a structural form with a composite deflection angle, which can ensure that after the oil-gas mixture is ejected from the oil outlet, it rotates in the main combustion area of the flame tube to form a large ring vortex, generating a low-speed recirculation area to stabilize the flame.

[0013] In an alternative embodiment, the combustion chamber further includes a casing. The casing is sleeved outside the flame tube, and the space between the casing and the flame tube forms a ventilation space. The evaporation assembly is located in the ventilation space. The evaporation assembly has an air inlet, and the evaporation chamber is communicated with the ventilation space through the air inlet. The overall structure is simple and reliable.

[0014] In an alternative embodiment, the combustion chamber further includes a fuel supply assembly. A fuel supply port communicated with the delivery chamber is further provided on the outer wall of the outer ring part. The fuel supply assembly passes through the casing and is connected to the fuel supply port.

[0015] Beneficial effects: The form of the fuel supply assembly is simple and reliable, and it can directly supply fuel to the delivery chamber.

[0016] In an alternative embodiment, the fuel supply assembly includes a fuel supply pipe and a joint assembly. The fuel supply pipe extends along the circumference of the casing. The fuel supply pipe is arranged in an arc shape, and the central angle corresponding to the fuel supply pipe is less than 90 degrees. Oil outlet parts arranged radially are respectively provided at both ends of the fuel supply pipe. An oil inlet part is arranged between both ends of the fuel supply pipe. Two fuel supply ports are provided on the outer wall of the outer ring part. Each oil outlet part passes through the casing through the joint assembly and is connected to the fuel supply port.

[0017] Beneficial effects: Since the oil outlet parts are arranged radially, this form of fuel supply pipe is more convenient for installation. During the assembly process, the fuel supply pipe only needs to be deformed slightly to be connected to the fuel supply port through the joint assembly.

[0018] In an alternative embodiment, the joint assembly includes a connection seat, a first mating seat and a second mating seat. The oil outlet part is fixedly connected to the first mating seat. The second mating seat is fixedly arranged on the outer wall of the outer ring part corresponding to the fuel supply port. The connection seat is sleeved outside the first mating seat and is connected to the first mating seat. The end of the first mating seat has a conical sealing surface, and the end of the second mating seat has a funnel-shaped mating surface. The first mating seat is connected to the second mating seat through the connection seat.

[0019] Beneficial effects: The joint assembly has a simple and reliable structure, which is convenient for disassembly and connection, and can also ensure the sealing effect through the mating form of pressing the sealing surface and the mating surface.

[0020] In an alternative embodiment, the fuel supply assembly further includes a cover plate sleeved outside the joint assembly. The cover plate is sealingly engaged with the joint assembly. A perforation for the joint assembly to pass through is provided on the outer wall of the casing. A sealing seat corresponding to the perforation is provided on the outer wall of the casing. The cover plate is connected to the sealing seat and the two are sealingly engaged.

[0021] Beneficial effects: The connection form is simple and reliable. The fuel supply assembly is connected to the sealing seat through the cover plate, which can further improve the sealing effect at the mating position between the fuel supply assembly and the casing.

[0022] In a second aspect, the present invention further provides an aeroengine, which includes: the above-mentioned combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 A sectional view of a combustion chamber according to an embodiment of the present invention;

[0025] Figure 2 For Figure 1 A sectional view of the flame tube of the combustion chamber shown;

[0026] Figure 3 For Figure 2 A three-dimensional view of the second outer ring section of the flame tube shown;

[0027] Figure 4 For Figure 2 A sectional view of the flame tube shown after being radially sectioned;

[0028] Figure 5 For Figure 1 A three-dimensional view of the evaporation assembly of the combustion chamber shown;

[0029] Figure 6 For Figure 5 A sectional view of the evaporation assembly after being assembled with the flame tube shown;

[0030] Figure 7 For Figure 5 A sectional view of the insertion tube part of the evaporation assembly shown;

[0031] Figure 8 For Figure 5 A view of the evaporation assembly shown on the side close to the flame tube;

[0032] Figure 9 Schematic sectional view of the main body part of the evaporation assembly shown in Figure 5 Figure 5 ;

[0033] Figure 10 Schematic three-dimensional view of the casing of the combustion chamber shown in Figure 1 Figure 1 ;

[0034] Figure 11 Schematic sectional view along the radial section of the combustion chamber shown in Figure 1 Figure 1 without showing the casing;

[0035] Figure 12 Schematic enlarged view of the position A of the combustion chamber shown in Figure 11 Figure 11 ;

[0036] Figure 13 Schematic partial view of the connection position between the fuel supply assembly and the flame tube of the combustion chamber shown in Figure 11 Figure 11 .

[0037] Explanation of reference numerals:

[0038] 1. Flame tube; 101. Working chamber;

[0039] 102. Outer ring part; 1021. Delivery chamber; 1022. Mounting port; 1023. Fuel injection hole; 1024. First outer ring section; 10241. First connection section; 10242. First protrusion; 1025. Second outer ring section; 10251. Second connection section; 10252. Second protrusion; 1026. Fuel supply port;

[0040] 103. Inner ring part; 104. Connection part;

[0041] 2. Evaporation assembly; 201. Evaporation chamber; 202. Fuel inlet; 203. Fuel outlet; 204. Main body; 205. Insertion pipe; 206. Air inlet;

[0042] 3. Casing; 301. Ventilation space; 302. Sealing seat; 303. Perforation;

[0043] 4. Fuel supply assembly;

[0044] 401. Fuel supply pipe; 4011. Fuel outlet part; 4012. Fuel inlet part;

[0045] 402. Connector assembly; 4021. Connection seat; 4022. First mating seat; 4023. Second mating seat; 4024. Retaining ring;

[0046] 403. Cover plate; 404. Sealing ring. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0048] In the related art, since the evaporation kit is an integral ring structure, not only a ring-shaped mixing chamber needs to be formed inside it, but also the inner wall of the evaporation chamber needs to be formed. When processing the ring structure, due to the large number of holes and complex curved surfaces in the internal structure, the processing difficulty of the overall structure is relatively high. After forming, the internal structure of the evaporation kit is not fine and flat enough, and it is difficult to reach the designed state. When welding and connecting with the flame tube subsequently, since the overall contact area between the evaporation kit and the flame tube is large and there are many joints between the two, it takes a long time of continuous welding to connect the two. Not only is it easy to have errors, but it is also difficult to ensure that the strength of each welding point over a long distance is consistent, and it is easy to fail during subsequent work. Therefore, although the evaporation tube structure in the related art can theoretically achieve better fuel atomization effect, the overall rationality of the evaporation tube structure is poor and it is difficult to manufacture.

[0049] The following combines Figures 1 to 13 , to describe the embodiments of the present invention.

[0050] According to an embodiment of the present invention, on the one hand, a combustion chamber is provided, including: a flame tube 1 and a plurality of evaporation components 2. The flame tube 1 is annularly arranged and has a working chamber 101 inside. Along its radial direction, the flame tube 1 includes an outer ring part 102 located outside the working chamber 101. The outer ring part 102 has a conveying chamber 1021 extending in the circumferential direction inside. The outer wall of the outer ring part 102 has a plurality of installation positions, which are arranged at intervals along the circumferential direction. The installation positions are provided with an installation port 1022 and an oil injection hole 1023. The installation port 1022 is communicated with the working chamber 101, and the oil injection hole 1023 is communicated with the conveying chamber 1021. A plurality of evaporation components 2 are arranged in one-to-one correspondence with the installation positions and are fixedly connected to the outer wall of the outer ring part 102. The evaporation component 2 has an evaporation chamber 201 inside. The outer wall of the evaporation component 2 is provided with an oil inlet 202 and an oil outlet 203 respectively communicated with the evaporation chamber 201. The oil injection hole 1023 is communicated with the evaporation chamber 201 through the oil inlet 202, and the oil outlet 203 is communicated with the working chamber 101 through the installation port 1022.

[0051] Applying the combustion chamber of this embodiment, evaporation components 2 are arranged at intervals outside the flame tube 1. The structure of a single evaporation component 2 is simpler, which is convenient for manufacturing and has a lower connection difficulty with the flame tube 1. In addition, the conveying cavity 1021 is located inside the outer ring part 102 of the flame tube 1. Compared with the conveying cavity 1021 being located in the evaporation component 2, it can not only significantly reduce the manufacturing difficulty of the evaporation component 2, but also the structure of the conveying cavity 1021 formed inside the outer ring part 102 is more stable and reliable. The structures of the various components of the combustion chamber are simpler, which is convenient for manufacturing and also reduces the assembly difficulty, effectively solving the problem that the existing evaporation tube has a complex structure and is difficult to manufacture and assemble.

[0052] It should be noted that in this embodiment, if the reference objects of the axial direction, radial direction, and circumferential direction are not specifically defined, they all refer to the axial direction, radial direction, and circumferential direction of the flame tube 1.

[0053] In a possible implementation manner, as Figures 2 to 4 shown, the flame tube 1 further includes an inner ring part 103 located inside the outer ring part 102, and connection parts 104 located at both axial ends of the outer ring part 102. Both axial ends of the outer ring part 102 are connected to the inner ring part 103 through the connection parts 104 respectively, thereby enclosing to form a working cavity 101; the outer ring part 102 includes a first outer ring section 1024 and a second outer ring section 1025 along the axial direction. The part of the first outer ring section 1024 close to the second outer ring section 1025 forms a first connection section 10241, and the part of the second outer ring section 1025 close to the first outer ring section 1024 forms a second connection section 10251. The first connection section 10241 and the second connection section 10251 are overlapped and arranged, and both enclose to form a conveying cavity 1021. The overall design of the flame tube 1 is in a segmented form, which is convenient for processing and manufacturing. In addition, the outer ring part 102 is in a segmented design. The first connection section 10241 and the second connection section 10251 overlap to form the conveying cavity 1021. They can be manufactured separately and the contact surface at the connection position is large, which can not only significantly reduce the formation difficulty of the conveying cavity 1021, but also effectively improve the connection reliability and stability of the first connection section 10241 and the second connection section 10251.

[0054] Among them, since the first outer ring section 1024 and the second outer ring section 1025 are independent structures, the form of forming the space of the conveying cavity 1021 is more flexible. The conveying cavity 1021 space can be formed by the first outer ring section 1024 protruding radially inward, or by the second outer ring section 1025 protruding radially outward, or by both protruding together to form the conveying cavity 1021 space. In addition, grooves can also be opened on the wall surface of at least one of them to form the conveying cavity 1021 space. There are various ways and can be flexibly selected according to requirements.

[0055] Specifically, as Figure 2As shown, the first outer ring section 1024 and the second outer ring section 1025 form an integral structure by welding.

[0056] Preferably, one of the connecting parts 104 at both ends is a head, and the other is a large elbow. The flame tube 1 as a whole is in an annular recirculation configuration and is composed of a head, a second outer ring section 1025, a first outer ring section 1024, a large elbow, and an inner ring section 103. Except that the second outer ring section 1025 is welded to the first outer ring section 1024 by electric resistance seam welding, the rest of the parts can be welded together by argon arc welding to form the whole flame tube 1.

[0057] In a possible implementation manner, the first outer ring section 1024 is located inside the second outer ring section 1025, and both the fuel injection holes 1023 and the mounting openings 1022 are located in the second outer ring section 1025; the first outer ring section 1024 has a first protruding portion 10242 that extends circumferentially and protrudes inward, and the space between the first protruding portion 10242 and the inner wall of the second outer ring section 1025 forms a conveying cavity 1021; with this form of the first outer ring section 1024, the space of the conveying cavity 1021 can be formed by its own first protruding portion 10242, and the structure is simple, reliable and convenient for processing and manufacturing. In addition, it can also make the outer wall of the second outer ring section 1025 relatively flat, which is more convenient for connecting the evaporation assembly 2.

[0058] Specifically, there is no limitation on the specific protruding form and size of the first protruding portion 10242, which can be an arc-shaped protrusion, a trapezoidal protrusion, etc., and the specific size can be flexibly selected according to the specific specifications and requirements of the combustion chamber.

[0059] Furthermore, the number of the second protruding portions 10252 and the mounting openings 1022 needs to be the same, and the actual number needs to be designed according to the size of the flame tube 1. Increasing the number is beneficial to the flame connection of the flame tube 1, but the oil quantity and oil pressure of each evaporation assembly 2 will decrease.

[0060] Preferably, the cross-sectional shape of the working cavity 101 is similar to a trapezoid and can be formed by stamping. The cross-sectional area is preferably not more than 8 mm2, which is equivalent to or slightly smaller than the cross-sectional area of the fuel supply pipe 401 of the fuel supply assembly 4.

[0061] In addition, after the second outer ring section 1025 is welded to the first outer ring section 1024, the second outer ring section 1025 can serve as the outer wall surface of the working chamber 101, thereby forming a sealed space for the working chamber 101. Since the second outer ring section 1025 and the first outer ring section 1024 are welded into an integral body by resistance seam welding, the welding deformation of the working chamber 101 will be relatively small, and the cross-sectional area of the working chamber 101 at different circumferential positions will not change significantly under the action of welding stress. Since the cross-sectional area of the working chamber 101 is small, after the fuel flows into the working chamber 101 through the fuel inlet and outlet 1026, it can quickly fill the entire working chamber 101, and then achieve multi-point uniform injection through the injection holes 1023, so that the fuel is basically evenly distributed circumferentially in the flame tube.

[0062] In a possible implementation, as Figure 4 and Figure 6 shown, the first outer ring section 1024 is located inside the second outer ring section 1025. The injection holes 1023 and the mounting openings 1022 are both located on the second outer ring section 1025. The second outer ring section 1025 is provided with a second protrusion 10252 corresponding to each mounting position. The second protrusion 10252 extends into the evaporation chamber 201 through the fuel inlet 202. The injection holes 1023 at the mounting positions are arranged on the second protrusion 10252. By applying this form of protrusion, the injection holes 1023 can enter the evaporation chamber 201, which can effectively prevent the fuel at the injection holes 1023 from spraying onto the inner wall of the fuel inlet 202 and improve the injection reliability at the injection holes 1023.

[0063] Specifically, as Figure 6 shown, since the evaporation assembly 2 inevitably has a wall surface with a certain thickness, there will also be a shielding surface with a height equal to the wall thickness at the fuel inlet 202. Setting the second protrusion 10252 can increase the height of the injection holes 1023 and prevent the fuel at the injection holes 1023 from spraying onto the shielding surface.

[0064] Furthermore, as Figure 6 shown, there are no restrictions on the specific structural form and specification dimensions of the second protrusion 10252. It can be a spherical protrusion, a columnar protrusion, etc., as long as it is convenient for processing and convenient for opening the injection holes 1023. The protruding degree of the second protrusion 10252 can be flexibly selected as long as the injection path of the injection holes 1023 can be prevented from being blocked by the fuel inlet 202.

[0065] It should be noted that one mounting opening 1022 and one second protrusion 10252 are provided in one mounting position. There is no restriction on the number of mounting positions. In the drawings of this embodiment, the case of 12 mounting positions is shown, and the specific number can also be flexibly increased or decreased according to specific requirements.

[0066] In addition, the number of fuel injection holes 1023 provided on each second protrusion 10252 is not limited, and can be one or multiple, and can be flexibly selected according to the fuel injection requirements. Preferably, as Figure 6 shown, the drawings of this embodiment show a case where two fuel injection holes 1023 are provided.

[0067] Preferably, as Figure 4 shown, the second protrusion 10252 is a spherical protrusion, the spherical radius ranges from 3.5 mm to 5.5 mm, the diameter of the fuel injection hole 1023 is less than or equal to 0.8 mm, and the included angle α1 between the axis of the fuel injection hole 1023 and the axis of the combustion chamber 1 ranges from 30 degrees to 60 degrees. The above specific values can also be determined according to the fuel supply characteristics.

[0068] In addition, if there is no second protrusion 10252 on the second outer ring section 1025 and the fuel injection hole 1023 is directly machined from the wall surface of the second outer ring section 1025, within the α1 angle range specified in this patent, with the shearing action of the incoming air, the fuel ejected from the fuel injection hole 1023 may hit the edge of the fuel inlet 202 of the evaporation assembly 2, affecting the fuel atomization effect.

[0069] In a possible implementation manner, as Figure 5 and Figure 6 shown, the evaporation assembly 2 includes a main body 204 and an extension tube 205 that are internally connected. The main body 204 has an evaporation chamber 201 and a fuel inlet 202, and the extension tube 205 has an oil outlet 203. At least a part of the extension tube 205 enters the working chamber 101 through the mounting opening 1022; one side of the main body 204 close to the combustion chamber 1 has a heat exchange surface, and the main body 204 is attached to the outer wall of the outer ring portion 102 through the heat exchange surface; the heat exchange surface of the main body 204 fits the shape of the outer wall surface of the outer ring portion 102. On the one hand, it is convenient to fill the brazing filler metal and firmly weld the evaporation assembly 2 to the combustion chamber 1 by brazing. On the other hand, it increases the contact area with the wall surface of the combustion chamber 1, which is beneficial to absorbing the combustion heat in the combustion chamber 1 and enhancing the evaporation effect of the fuel inside the evaporation assembly 2.

[0070] It can be understood that as an alternative implementation manner, the connection between the heat exchange surface of the main body 204 and the outer wall surface of the outer ring portion 102 is not limited to being connected by brazing. Here, only the convenient effects generated during the brazing process are described, and other welding methods can also be used according to requirements.

[0071] In a possible implementation manner, as Figures 5 to 8As shown, the part of the extension pipe 205 extending into the working chamber 101 has a compound deflection angle. The range of the axial deflection angle of this part is 45° to 60°, and the range of the circumferential deflection angle is 50° to 70°. For the extension pipe 205 in this form, when the oil-gas mixture flows through the oil outlet 203, a certain acceleration effect can be obtained to avoid backflow. Designing the extension pipe 205 into a structure with a compound deflection angle can ensure that after the oil-gas mixture is ejected from the oil outlet 203, it rotates in the main combustion zone of the flame tube 1 to form a large ring vortex, generating a low-speed recirculation zone to stabilize the flame.

[0072] In addition, the overall structure of the evaporation assembly 2 is relatively compact and has a relatively small volume, and will not affect the design or air intake of the main combustion holes, mixing holes, cooling holes, etc. on the flame tube 1.

[0073] Preferably, the structure of the extension pipe 205 is approximately similar to a Laval nozzle. The profile first contracts, then there is a straight section with a length of about 2 mm to 4 mm, and finally it expands. The axial deflection angle α2 is between 45° and 60°, and the circumferential deflection angle β is between 50° and 70°.

[0074] In a possible implementation manner, the combustion chamber further includes a casing 3. The casing 3 is sleeved outside the flame tube 1. The space between the casing 3 and the flame tube 1 forms a ventilation space 301. The evaporation assembly 2 is located in the ventilation space 301. The evaporation assembly 2 has an air inlet 206. The evaporation chamber 201 is communicated with the ventilation space 301 through the air inlet 206, and the overall structure is simple and reliable.

[0075] Among them, the ventilation space 301 is the secondary air passage.

[0076] Specifically, the length of the main pipe body 204 is more than 40 mm to ensure that the fuel has sufficient evaporation distance. The extension pipe 205 is circular in shape. The oil outlet 203 and the extension pipe 205 can be inserted through the installation opening 1022 on the second outer ring section 1025. It should be noted that in order to ensure smooth insertion, the aperture of the installation opening 1022 is 2.5 to 3.5 mm larger than the maximum diameter of the oil outlet 203 and the extension pipe 205. The diameter range of the air inlet 206 is 8 to 12 mm, preferably 10 mm. After the oncoming air from the compressor outlet enters the ventilation space 301, it can enter the evaporation pipe from the air inlet 206.

[0077] In addition, the dimensions of the main pipe body 204 along the radial and circumferential directions are both controlled within 12 - 13 mm to avoid excessive blockage of the secondary air passage and affect the air flow in the secondary air passage.

[0078] Furthermore, the air flow direction in the ventilation space 301 is consistent with the axial direction, and the pitch angle between the air flow and the axis direction is generally 0°. This can cause a certain degree of shear between the fuel and the air flow, strengthening the fragmentation and atomization of the fuel and the air flow in the evaporation chamber 201.

[0079] In a possible implementation, the combustion chamber further includes a fuel supply assembly 4. An oil supply port 1026 communicating with the delivery chamber 1021 is further provided on the outer wall of the outer ring portion 102. The fuel supply assembly 4 passes through the casing 3 and is connected to the oil supply port 1026. The form of the fuel supply assembly 4 is simple and reliable, and can directly supply fuel to the delivery chamber 1021.

[0080] In a possible implementation, the fuel supply assembly 4 includes a fuel supply pipe 401 and a joint assembly 402. The fuel supply pipe 401 extends along the circumferential direction of the casing 3. The fuel supply pipe 401 is arranged in an arc shape, and the central angle corresponding to the fuel supply pipe 401 is less than 90 degrees. Oil outlet portions 4011 arranged in the radial direction are respectively provided at both ends of the fuel supply pipe 401. An oil inlet portion 4012 is arranged between both ends of the fuel supply pipe 401. Two oil supply ports 1026 are provided on the outer wall of the outer ring portion 102. Each oil outlet portion 4011 passes through the casing 3 through the joint assembly 402 and is connected to the oil supply port 1026. Since the oil outlet portions 4011 are arranged in the radial direction, the fuel supply pipe 401 of this form is more convenient for installation. During the assembly process, the fuel supply pipe 401 only needs to undergo a small deformation to be connected to the oil supply port 1026 through the joint assembly 402.

[0081] Specifically, the specific form of the joint assembly 402 is not limited, and it can be in the form of a connecting sleeve, a connecting pipe, a connecting seat, etc. The specific connection method can be flexibly selected according to requirements.

[0082] In a possible implementation, the joint assembly 402 includes a connecting seat 4021, a first mating seat 4022, and a second mating seat 4023. The oil outlet portion 4011 is fixedly connected to the first mating seat 4022. The second mating seat 4023 is fixedly arranged on the outer wall of the outer ring portion 102 corresponding to the oil supply port 1026. The connecting seat 4021 is sleeved outside the first mating seat 4022 and is connected to the first mating seat 4022. The end of the first mating seat 4022 has a conical sealing surface, and the end of the second mating seat 4023 has a funnel-shaped mating surface. The first mating seat 4022 is connected to the second mating seat 4023 through the connecting seat 4021. The structure of the joint assembly 402 is simple and reliable, which is convenient for disassembly and connection, and at the same time, the sealing effect can be ensured through the mating form of pressing the sealing surface and the mating surface.

[0083] Among them, the position between the connecting seat 4021 and the first mating seat 4022 is fixed by a retaining ring 4024. One end of the first mating seat 4022 is a plug sleeve designed according to the HB6067-6072 standard, which has a good sealing function. The other end is designed with a positioning hole. The oil outlet part 4011 can be inserted into this positioning hole, and the first mating seat 4022 and the fuel supply pipe 401 are welded into a whole by brazing or argon arc welding. A retaining ring wire installation groove is also designed on the outside of the first mating seat 4022. One end of the connecting seat 4021 is designed with an MJ thread, the outside of the other end is hexagonal, and the inside is designed with the same retaining ring wire installation groove. The structure can refer to the MA2047C standard. The connecting seat 4021 can be inserted from the plug sleeve end of the first mating seat 4022. After aligning the retaining ring wire installation grooves between the two parts, the retaining ring 4024 can be inserted to realize the fixation between the connecting seat 4021 and the first mating seat 4022.

[0084] In addition, one end of the second mating seat 4023 on the flame tube 1 is hexagonal on the outside and is welded to the second outer ring section 1025. The other end is designed with a 24° internal taper surface and an external thread according to the HB5970 standard.

[0085] Specifically, the installation port 1022 and the fuel inlet and supply port 1026 on the second outer ring section 1025 can be ordinary round holes, which can be processed by common means such as laser cutting and drills. The diameter of the fuel supply port 1026 is larger than the inner diameter of the second mating seat 4023. This inner diameter relationship can effectively prevent the situation of interception caused by the non-concentricity of the fuel inlet and supply port 1026 and the inner hole of the second mating seat 4023 when the welding positioning deviation occurs between the second mating seat 4023 and the second outer ring section 1025.

[0086] Furthermore, an oil inlet part 4012 and multiple oil outlet parts 4011 are arranged on the fuel supply pipe 401. For this example, as Figure 11 shown, two oil outlet parts 4011 are arranged. The number of oil outlet parts 4011 can be determined according to the amount of fuel supply. The more the fuel supply, the more the oil outlet parts 4011 and the fuel supply ports 1026 can be increased accordingly. However, in order to make the fuel supply assembly 4 easy to assemble, generally the number of oil outlet parts 4011 does not exceed 2. The position of the oil inlet part 4012 is designed as close as possible directly below the combustion chamber. After the engine stops, the residual fuel in the working chamber 101 flows back through the first mating seat 4022, and the residual fuel in the fuel supply assembly 4 can continue to flow away through the oil inlet part 4012, avoiding the accumulation of too much fuel.

[0087] In a possible implementation, the fuel supply assembly 4 further includes a cover plate 403 sleeved outside the joint assembly 402. The cover plate 403 is in sealed cooperation with the joint assembly 402. A perforation 303 for the joint assembly 402 to pass through is provided on the outer wall of the casing 3, and a sealing seat 302 corresponding to the perforation 303 is provided on the outer wall of the casing 3. The cover plate 403 is connected to the sealing seat 302 and the two are in sealed cooperation. The connection form is simple and reliable. The fuel supply assembly 4 is connected through the cover plate 403 and the sealing seat 302, which can further improve the sealing effect at the mating position between the fuel supply assembly 4 and the casing 3.

[0088] Wherein, a sealing ring 404 is further provided between the mating surfaces of the cover plate 403 and the connecting seat 4021. The cover plate 403 is of a flat plate structure with a round hole designed in the middle for the connecting seat 4021 to pass through. In order to reduce the risk of air leakage between the round hole of the cover plate 403 and the connecting seat 4021, the diameter of the round hole should not be too large, and it is sufficient to be 0.2 - 1 mm larger than the diameter of the mating circular surface of the connecting seat 4021; four bolt holes are designed around the cover plate 403, and the cover plate 403 can be pressed against the sealing seat 302 through four bolts.

[0089] In addition, since the flame tube may be deformed after long-term use, resulting in a change in the axial position of the second mating seat 4023, in order to ensure smooth assembly and reduce stress, the round hole in the middle of the sealing seat 302 can be designed larger, 1 - 3 mm larger than the diameter of the mating circular surface of the connecting seat 4021, leaving enough deformation allowance. The sealing ring 404 can be designed between the mating surfaces of the cover plate 403 and the connecting seat 4021, or can be designed between the mating surfaces of the cover plate 403 and the sealing seat 302. The former is shown in the attached drawings of this example.

[0090] When assembling the fuel supply assembly 4, first sleeve the cover plate 403 and the sealing ring 404 onto the connecting seat 4021, insert the connecting seat 4021 and the first mating seat 4022 into the sealing seat 302. Use two open-end wrenches, one holding the hexagonal head of the connecting seat 4021, and the other reaching in from the two-way channel to hold the hexagonal head of the second mating seat 4023. By turning the connecting seat 4021, the first mating seat 4022 can be driven to approach the second mating seat 4023, and finally, sealing is achieved through the 24° spherical cone surface fit to prevent fuel from overflowing from the mating surface between the first mating seat 4022 and the second mating seat 4023.

[0091] Specifically, as Figure 1 and [[ID=�9]]Figure 12 shown, the sealing seat 302 is located at the lower side of the casing 3, close to the lowest point of the casing 3. Arranging the sealing seat 302 in this form also makes the position of the fuel supply port 1026 close to the lowest point of the casing 3. When the engine stops, the residual fuel in the working chamber 101 can flow back through the first mating seat 4022 on the fuel supply assembly 4, avoiding the accumulation of too much fuel and causing coking.

[0092] Preferably, as Figure 1 and Figure 12 shown, the outer contour shape of the sealing seat 302 is square, which is beneficial to increasing the contact sealing area with the cover plate 403 and preventing air leakage; a circular hole is opened in the middle, so that the first mating seat 4022 and the connecting seat 4021 on the fuel supply assembly 4 can extend into it; 4 threaded holes are designed around it, and the cover plate 403 and the sealing seat 302 can be pressed and fixedly connected by 4 bolts.

[0093] Hereinafter, the assembly method of the combustion chamber of the present application will be described:

[0094] Weld the head, the second outer ring section 1025, the first outer ring section 1024, the large elbow pipe, the inner ring part 103, and the second mating seat 4023 into a whole; extend the oil outlet 203 of the evaporation assembly 2 from the installation port 1022, so that the whole evaporation assembly 2 fits against the wall surface of the second outer ring section 1025, and is welded to the flame tube 1 as a whole by brazing; push the whole flame tube 1 into the casing 3, and put the cover plate 403 and the sealing ring 404 into the connecting seat 4021 of the fuel supply assembly 4; extend the first mating seat 4022 and the connecting seat 4021 of the fuel supply assembly 4 into the sealing seat 302 of the casing 3, and use 2 open-ended wrenches to hold the second mating seat 4023 and turn the connecting seat 4021 until the first mating seat 4022 and the second mating seat 4023 are assembled in place; use 4 bolts to press the cover plate 403 and the sealing seat 302 to prevent air leakage.

[0095] Hereinafter, the working process inside the combustion chamber of the present application will be described:

[0096] Fuel is injected from the fuel inlet part 4012 of the fuel supply assembly 4, and then enters the first mating seat 4022 from two fuel outlet parts 4011, flows into the working chamber 101 through two second mating seats 4023. Due to the relatively high pressure of the fuel and the small cross-sectional area of the working chamber 101, the working chamber 101 can be filled with fuel in a very short time. At the same time, the fuel is evenly injected at multiple points through 12 groups of injection holes 1023. The injection holes 1023 are used as the nozzles of direct injection nozzles. The fuel is preliminarily atomized here and enters the evaporation assembly 2. However, the atomization effect is poor at this time and there are still large-sized oil droplets. The oncoming air at the compressor outlet enters the evaporation assembly 2 through the air inlet 206, shears with the fuel to further atomize the fuel and premixes with the fuel. At the same time, the high-temperature combustion gas can transfer heat into the evaporation assembly 2 through media such as heat conduction and radiation to heat the fuel and accelerate the evaporation process of the fuel. Since the oil outlet 203 of the evaporation assembly 2 has a compound deflection angle, after the oil-gas mixture is sprayed from the evaporation assembly 2 into the combustion chamber liner 1, it will continue to rotate circumferentially, thereby forming a large ring vortex in the main combustion zone of the combustion chamber liner 1, which is beneficial to the formation of the recirculation zone, easy to ignite successfully and stabilize the flame. In addition, the flow channel cross-section of the oil outlet 203 of the evaporation assembly 2 is similar to the structure of a Laval nozzle. When the oil-gas mixture flows through the oil outlet 203, it can obtain a certain acceleration effect, effectively avoiding backflow and causing flashback. Since all the subordinate parts of the entire combustion chamber liner 1 can be formed by stamping sheet metal and the fuel nozzle with a complex structure is omitted, the cost of the combustion chamber can be greatly reduced.

[0097] According to an embodiment of the present invention, on the other hand, there is provided an aeroengine, which includes: the above-described combustion chamber.

[0098] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A combustion chamber, characterized in that, Comprising: A combustion chamber (1), which is annularly arranged and has a working chamber (101) inside. Along its radial direction, the combustion chamber (1) includes an outer ring part (102) located outside the working chamber (101). The outer ring part (102) has a conveying chamber (1021) extending circumferentially inside. The outer wall of the outer ring part (102) has a plurality of mounting positions, and the plurality of mounting positions are arranged at intervals along the circumferential direction. An installation port (1022) and an oil injection hole (1023) are provided in the mounting position. The installation port (1022) communicates with the working chamber (101), and the oil injection hole (1023) communicates with the conveying chamber (1021); A plurality of evaporation components (2), which are arranged in one-to-one correspondence with the mounting positions and are fixedly connected to the outer wall of the outer ring part (102). The evaporation component (2) has an evaporation chamber (201) inside. An oil inlet (202) and an oil outlet (203) respectively communicating with the evaporation chamber (201) are provided on the outer wall of the evaporation component (2). The oil injection hole (1023) communicates with the evaporation chamber (201) through the oil inlet (202), and the oil outlet (203) communicates with the working chamber (101) through the installation port (1022).

2. The combustion chamber according to claim 1, wherein The combustion chamber (1) further includes an inner ring part (103) located inside the outer ring part (102), and connecting parts (104) located at both axial ends of the outer ring part (102). Both axial ends of the outer ring part (102) are respectively connected to the inner ring part (103) through the connecting parts (104), thereby enclosing to form the working chamber (101); The outer ring part (102) includes a first outer ring section (1024) and a second outer ring section (1025) along the axial direction. A part of the first outer ring section (1024) close to the second outer ring section (1025) forms a first connecting section (10241), and a part of the second outer ring section (1025) close to the first outer ring section (1024) forms a second connecting section (10251). The first connecting section (10241) and the second connecting section (10251) overlap and enclose to form the conveying chamber (1021).

3. The combustion chamber according to claim 2, characterized in that, The first outer ring section (1024) is located inside the second outer ring section (1025), and both the oil injection hole (1023) and the installation port (1022) are located in the second outer ring section (1025); The first outer ring section (1024) has a first protruding part (10242) extending circumferentially and protruding inwards. The space between the first protruding part (10242) and the inner wall of the second outer ring section (1025) forms the conveying chamber (1021); And / or, the second outer ring section (1025) is provided with a second protruding part (10252) corresponding to the position of each mounting position. The second protruding part (10252) extends into the evaporation chamber (201) through the oil inlet (202), and the oil injection hole (1023) at the mounting position is arranged on the second protruding part (10252).

4. The combustion chamber according to claim 1, characterized in that, The evaporation component (2) includes a main body (204) with internal communication and an extension pipe (205). The main body (204) has the evaporation chamber (201) and the oil inlet (202). The extension pipe (205) has the oil outlet (203). At least a part of the extension pipe (205) enters the working chamber (101) through the installation port (1022); One side of the main body (204) close to the flame tube (1) has a heat exchange surface, and the main body (204) is attached to the outer wall of the outer ring part (102) through the heat exchange surface; And / or, the part of the extension pipe (205) extending into the working chamber (101) has a compound deflection angle. The range of the axial deflection angle of this part is 45° to 60°, and the range of the circumferential deflection angle is 50° to 70°.

5. The combustion chamber according to any one of claims 1 to 4, characterized in that, The combustion chamber further includes a casing (3). The casing (3) is sleeved outside the flame tube (1). The space between the casing (3) and the flame tube (1) forms a ventilation space (301). The evaporation component (2) is located in the ventilation space (301). The evaporation component (2) has an air inlet (206), and the evaporation chamber (201) is communicated with the ventilation space (301) through the air inlet (206).

6. The combustion chamber according to claim 5, characterized in that, The combustion chamber further includes a fuel supply component (4). A fuel supply port (1026) communicated with the delivery chamber (1021) is further provided on the outer wall of the outer ring part (102). The fuel supply component (4) passes through the casing (3) and is connected to the fuel supply port (1026).

7. The combustor according to claim 6, characterized in that, The fuel supply component (4) includes a fuel supply pipe (401) and a joint component (402). The fuel supply pipe (401) extends along the circumference of the casing (3). The fuel supply pipe (401) is arranged in an arc shape. The central angle corresponding to the fuel supply pipe (401) is less than 90 degrees. Oil outlet parts (4011) arranged radially are respectively provided at both ends of the fuel supply pipe (401). An oil inlet part (4012) is arranged between both ends of the fuel supply pipe (401). Two fuel supply ports (1026) are provided on the outer wall of the outer ring part (102). Each oil outlet part (4011) passes through the casing (3) through the joint component (402) and is connected to the fuel supply port (1026).

8. The combustion chamber according to claim 7, characterized in that, The joint assembly (402) includes a connection base (4021), a first mating base (4022), and a second mating base (4023). The oil outlet part (4011) is fixedly connected to the first mating base (4022). The second mating base (4023) is fixedly arranged on the outer wall of the outer ring part (102) corresponding to the oil supply port (1026). The connection base (4021) is sleeved outside the first mating base (4022) and connected to the first mating base (4022). The end of the first mating base (4022) has a conical sealing surface, and the end of the second mating base (4023) has a funnel-shaped mating surface. The first mating base (4022) is connected to the second mating base (4023) through the connection base (4021).

9. The combustion chamber according to claim 7, wherein, The oil supply assembly (4) further includes a cover plate (403) sleeved outside the joint assembly (402). The cover plate (403) is in sealing cooperation with the joint assembly (402). A perforation (303) for the joint assembly (402) to pass through is provided on the outer wall of the casing (3). A sealing seat (302) corresponding to the perforation (303) is provided on the outer wall of the casing (3). The cover plate (403) is connected to the sealing seat (302) and the two are in sealing cooperation.

10. An aeroengine, characterized in that, Comprising: The combustion chamber according to any one of claims 1 to 9.

Images