Combustion chamber with double diffusion channels and engine

Abstract

The invention belongs to the field of aero-engines, and particularly relates to a combustion chamber with double diffusion channels and an engine. The combustion chamber with the double diffusion channels comprises a double diffusion channel structure and a combustion chamber casing, and an outlet of the double diffusion channel structure is connected with an inlet of the combustion chamber casing; the double-diffusion-channel structure comprises a fish-shaped supporting plate, an annular inner supporting plate, an annular middle supporting plate and an annular outer supporting plate. The annular inner support plate is arranged in the annular outer support plate to form a flow channel which is gradually enlarged from an inlet to an outlet; at the inlet end of the flow channel, the annular inner supporting plate and the annular outer supporting plate are connected with a plurality of fish-shaped supporting plates, the heads of the fish-shaped supporting plates face an inlet of the combustion chamber casing, and the tails of the fish-shaped supporting plates face an outlet of the combustion chamber casing; and the tail part is connected with the annular middle support plate so as to divide the runner into a first runner and a second runner. The engine has the advantage that the power capability of the engine is further ensured and improved under the action of ensuring small pressure loss and high combustion efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of aero-engines, and particularly relates to a combustor and an engine with a double diffuser channel. Background Art

[0002] A diffuser is one of the key components of a combustor. A flow channel with a gradually increasing cross-sectional area along the air flow direction is arranged inside it, which is mainly used to recover the dynamic pressure of the high-speed air flow at the compressor outlet into static pressure as much as possible, and then flows into the flame tube and the inner and outer ring channels to maintain efficient and stable combustion in the flame tube.

[0003] With the development of aero-engines, the requirement for the power-to-weight ratio of aero-engines is getting higher and higher; especially for high Mach number aircraft, the requirement for the power-to-weight ratio is even higher. To improve the power-to-weight ratio of an aero-engine, it can be achieved by reducing the pressure loss of the air entering the combustor. Therefore, the high-pressure air flow coming out of the compressor needs to be diffused and decelerated quickly in a short distance through the diffuser with small pressure loss.

[0004] The existing conventional diffuser structural configurations (as shown in Figure 1 , including: 1 - diffuser, 2 - swirler, 3 - combustor, 4 - outer ring of the flame tube, 5 - inner ring of the flame tube, 6 - outer ring outlet beak structure, 7 - inner ring outlet beak structure) often have problems such as air flow separation, poor deceleration effect, high pressure loss, and poor aerodynamic stability when facing high inlet Mach number air flow, resulting in high pressure loss and low combustion efficiency in the combustor, thus affecting the engine power.

[0005] Chinese Patent Application: CN111520745A discloses a combustion component structure of a turbojet engine. A guide vane and a front cover are respectively arranged at both ends of a casing with a cavity structure in the middle. A bushing coaxial with the casing is fixed on the guide vane, and a diffuser is fixed on the outer ring of the other end of the bushing. The cross-section of the connection surface of the guide vane and the bushing along the axis of the bushing is V-shaped. A double-layer annular combustion chamber with a V-shaped cross-section along the axis of the bushing is arranged on the outer ring of the bushing. The two V-shaped structures can make the air flow entering from the diffuser fit the wall surface of the V-shaped structure of the double-layer annular combustion chamber more, and at the same time avoid the air flow entering from the diffuser from flowing back at the air inlet.

[0006] However, when the structure of this application faces the impact of high-temperature and high Mach number air flow, although it can decelerate in a short distance, the V-shaped guide vanes bring a problem of large flow resistance, resulting in large pressure loss of the engine and affecting the work capacity of the engine; moreover, the V-shaped vanes are actually blunt body structures, there is a lack of air flow in the center of the V-shape, resulting in problems of excessive local air flow and lack of local air flow, and the overall air intake uniformity is poor, thus resulting in poor air flow uniformity entering the flame tube, affecting the internal air flow organization combustion, uneven combustion area, and problems of insufficient local air volume, reducing the combustion efficiency and further reducing the work capacity of the engine.

[0007] In view of this, the present invention is hereby proposed. SUMMARY OF THE INVENTION

[0008] In order to solve the technical problems existing in the prior art, the present invention provides a combustor and an engine with a double diffuser channel. The structure of the diffuser of the present invention (the airfoil design of the guide vanes and the full-ring diffuser) has the characteristics of short-distance speed reduction and pressure diffusion, small pressure loss, and simple structure form in the face of high-temperature and high-Mach-number air flow conditions. Moreover, the full-ring diffuser is adopted, the air flow uniformity is good, the pressure in the inner and outer ring cavities is uniform, the air intake of the inner and outer rings of the flame tube is made uniform, and the combustor efficiency is high. It has the advantages of further ensuring and improving the work capacity of the engine while ensuring small pressure loss and high combustion efficiency.

[0009] The present invention includes the following technical solutions:

[0010] In a first aspect of the present invention, there is provided a combustor with a double diffuser channel, including a double diffuser channel structure and a combustor casing. The outlet of the double diffuser channel structure is connected to the inlet of the combustor casing. The double diffuser channel structure includes fish-shaped struts, an annular inner strut, an annular intermediate strut, and an annular outer strut. The annular inner strut is arranged inside the annular outer strut to form a flow channel that gradually increases from the inlet to the outlet. At the inlet end of the flow channel, the annular inner strut and the annular outer strut are connected with a plurality of fish-shaped struts. The head of the fish-shaped strut faces the inlet of the combustor casing, and the tail of the fish-shaped strut faces the outlet of the combustor casing. The tail is connected to the annular intermediate strut to divide the flow channel into a first flow channel and a second flow channel.

[0011] Further, the annular intermediate strut is a corrugated structure.

[0012] Further, a flow rectifying structure is provided at the front end of the head of the fish-shaped strut.

[0013] Further, the flow rectifying structure includes a flow rectifying channel and crescent-shaped guide vanes, and the crescent-shaped guide vanes are uniformly arranged around the flow rectifying channel.

[0014] Further, the combustor casing includes an inner combustor casing and an outer combustor casing. The annular outer strut is fixedly connected to the outer combustor casing. The annular inner strut is connected to the wall surface of the inner combustor casing through a Y-shaped support. The end of the inner combustor casing is connected to the fish-shaped strut.

[0015] Further, the air flow is first expanded through the double diffuser channel structure and then expanded for the second time after entering the combustor casing.

[0016] Further, the expansion angle of the first expansion is smaller than the expansion angle of the second expansion.

[0017] Further, a test channel is provided in the fish-shaped splitter plate.

[0018] Further, the double-diffuser channel structure and the combustor casing are integrally formed.

[0019] In a second aspect of the present invention, an engine is provided, including the combustor described above.

[0020] Adopting the above technical solutions, the present invention has the following advantages:

[0021] 1. The structure of the diffuser of the present invention (the profile design of the guide vane and the full-ring diffuser) has the characteristics of short-distance deceleration and pressure reduction, small pressure loss, and simple structure form under the conditions of high-temperature and high-Mach-number airflows. Moreover, the full-ring diffuser is adopted, with good airflow uniformity, uniform pressure in the inner and outer ring cavities, realizing uniform intake of air into the inner and outer rings of the flame tube, making the combustor efficient. It has the advantage of further ensuring and improving the work capacity of the engine while ensuring small pressure loss and high combustion efficiency.

[0022] 2. The corrugated structure is designed for the annular intermediate splitter plate of the present invention. The corrugated section structure is conducive to increasing the contact area between the airflow and the splitter plate, and has the advantage of short-distance rapid deceleration.

[0023] 3. The double-diffuser channel structure and the combustor casing of the present invention adopt an integrated structure design, and test and air extraction channel structures are designed inside. The integrated design of multiple structures reduces the welding and mounting edge structures, which is beneficial to reducing the weight of the combustor and the engine.

[0024] 4. The annular inner splitter plate of the present invention is connected to the inner casing of the combustor through a Y-shaped support, which can support the annular inner splitter plate, strengthen the structural stiffness and strength of the annular inner splitter plate, and is not prone to deformation under the conditions of high temperature, high pressure, and high Mach number, which is beneficial to maintaining the original designed profile state and extending the reliability and service life of the combustor. Further, the Y-shaped support, the double-diffuser channel structure, and the combustor casing are integrally processed by additive manufacturing technology, without the need to additionally add supports, reducing the processes of removing supports and cleaning powders in the processing technology, and effectively reducing the processing cost.

[0025] 5. The pre-rectifying structure of the present invention deflects the airflow through the crescent-shaped guide vane. Regardless of how the airflow angle at the outlet of the front compressor changes, after passing through this crescent-shaped guide vane, the airflow entering the combustor can be in a fixed-angle state, ensuring that the intake conditions at the inlet of the combustor are designable and determinable, thereby improving the anti-distortion ability of the internal flow field of the combustor, specifically improving the stability of the combustor.

[0026] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for use in the description of the 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, without creative efforts, other drawings may be obtained based on these drawings.

[0028] Figure 1 For the drawings of the background art;

[0029] Figure 2 Structural schematic diagram of a combustor with a double diffuser channel in an embodiment of the present invention;

[0030] Figure 3 Partial structural schematic diagram of a combustor with a double diffuser channel in an embodiment of the present invention;

[0031] Figure 4 Left view of a combustor with a double diffuser channel in an embodiment of the present invention;

[0032] Figure 5 For Figure 4 Cross-section along the A-A direction in Figure 1 ;

[0033] Figure 6 For Figure 4 Cross-section along the A-A direction in Figure 2 ;

[0034] Figure 7 Cross-sectional view of the structure of another combustor with a double diffuser channel in an embodiment of the present invention;

[0035] Figure 8 For Figure 7 Partial structural schematic diagram of

[0036] Figure 9 For Figure 5 Cross-section along the C-C direction of the fish-shaped splitter plate in

[0037] Figure 10 Cross-sectional view of another fish-shaped splitter plate in an embodiment of the present invention;

[0038] Figure 11 For Figure 5 Cross-section along the D-D direction of the crescent-shaped flow guiding vane in

[0039] In the figure, 1 - diffuser, 2 - swirler, 3 - combustion chamber, 4 - outer ring of the flame tube, 5 - inner ring of the flame tube, 6 - outer ring outlet beak structure, 7 - inner ring outlet beak structure, 10 - double diffuser channel structure, 11 - fish-shaped splitter plate, 111 - test channel, 12 - annular inner splitter plate, 13 - annular middle splitter plate, 14 - annular outer splitter plate, 15 - flow channel, 151 - first flow channel, 152 - second flow channel, 20 - combustion chamber casing, 21 - inner casing of the combustion chamber, 22 - outer casing of the combustion chamber, 30 - Y-shaped support, 40 - reinforcing rib, 50 - rectifying structure, 51 - rectifying channel, 52 - crescent-shaped guide vane, 60 - flame tube, 70 - swirler, 80 - front mounting flange of the casing. Specific embodiments

[0040] The following description provides many different embodiments or examples for implementing different features of the present invention. The elements and arrangements described in the following specific examples are only used to concisely express the present invention, and they are only examples and not intended to limit the present invention.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0042] In the prior art, there is also a solution to the problem of flow rate matching between the diffuser and the combustion chamber by designing the diffuser (for example, the outlets of multiple channels of the diffuser are directly connected to the swirler 70 and cooling holes of the flame tube 60, that is, the airflows in multiple channels of the diffuser are separated from each other and do not mix before entering the flame tube 60).

[0043] To implement the above design of the diffuser, a partition plate can be arranged in the gradually increasing flow channel 15 of the diffuser to divide the channel into multiple flow channels 15. Such a partition plate is in a suspended state in the flow channel 15, so the rear end of the partition plate is connected to the flame tube 60. This not only plays a supporting role but also controls the flow rate of each intake channel entering the flame tube 60 through the diffuser.

[0044] In such a case, the flow distribution of each intake passage of the flame tube 60 in the combustion chamber is determined by the area of each flow passage 15 of the diffuser, which will cause the flame tube 60 itself to fail in flow distribution. Under different operating conditions of the engine, the airflow rate at the inlet of the combustion chamber (the outlet of the compressor) is uncertain. Simply relying on the diffuser to control the intake air volume of each passage of the flame tube 60, the flame tube 60 loses its self-adjustment ability, which easily causes a significant decrease in the combustion efficiency under other operating conditions except the design point state, thereby affecting the work capacity of the engine. In addition, such a diffuser is prone to cause air flow concentration, insignificant diffusing effect, and large pressure loss under the condition of large-flow and high-Mach-number airflows.

[0045] Therefore, in order to solve the above technical problems, in the first aspect of this embodiment, a combustion chamber with a double-diffusion channel is provided, as Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, which includes a double-diffusion channel structure 10 and a combustion chamber casing 20. The outlet of the double-diffusion channel structure 10 is connected to the inlet of the combustion chamber casing 20; the double-diffusion channel structure 10 includes a fish-shaped splitter plate 11, an annular inner splitter plate 12, an annular intermediate splitter plate 13, and an annular outer splitter plate 14; the annular inner splitter plate 12 is arranged inside the annular outer splitter plate 14 to form a flow passage 15 that gradually increases from the inlet to the outlet; at the inlet end of the flow passage 15, the annular inner splitter plate 12 and the annular outer splitter plate 14 are connected with a plurality of fish-shaped splitter plates. The head of the fish-shaped splitter plate faces the inlet of the combustion chamber casing 20, and the tail of the fish-shaped splitter plate faces the outlet of the combustion chamber casing 20; the tail is connected to the annular intermediate splitter plate 13 to divide the flow passage 15 into a first flow passage 151 and a second flow passage 152.

[0046] Among them, the fish-shaped splitter plate can not only support and fix the annular inner splitter plate 12, so the annular inner splitter plate 12 does not need to be fixed by the flame tube 60; in this way, it can be ensured that the flow rate entering the flame tube 60 is controlled by the flame tube 60 itself; on the one hand, the work capacity of the engine is improved, and on the other hand, under the condition of large-flow and high-Mach-number airflows, the diffusing effect is good and the pressure loss is small; moreover, the fish-shaped splitter plate can reduce the flow resistance, so that the airflow entering the diffuser achieves the effect of reducing losses.

[0047] Working principle: The outside air enters the engine, is pressurized and accelerated by the compressor, flows through the last-stage rotor of the compressor, forms a high-speed and high-pressure airflow, and flows towards the combustion chamber. This incoming flow passes through the fish-shaped splitter plate 11 to achieve speed reduction; as Figure 9 shown, by designing parameters such as R1: the arc surface of the front edge fish mouth, R2: the arc surface of the tail edge fish tail, two S1: the guiding front side arc surface of the fish-shaped splitter plate 11, and two S2: the guiding rear side arc surface of the fish-shaped splitter plate 11, etc., the flow resistance is reduced, and the speed is reduced again through the first flow passage 151 and the second flow passage 152.

[0048] In some embodiments, as Figure 5 , Figure 6 shown, at the front end of the head of the fish-shaped splitter plate, a fairing structure 50 is provided.

[0049] In some embodiments, as Figure 7 , Figure 8 shown, the annular intermediate splitter plate 13 is a corrugated structure. Preferably, as Figure 8 shown, the corrugations of the annular intermediate straight plate 13 extend circumferentially, and a plurality of corrugations are arranged axially; the crests and troughs of the plurality of corrugations arranged axially are correspondingly arranged, that is, the crests correspond to the crests and the troughs correspond to the troughs. Preferably, the center of the corrugated annular intermediate splitter plate 13 is a hollow structure to achieve the effect of weight reduction.

[0050] In some embodiments, as Figure 2 , Figure 3 , Figure 4 shown, a front casing mounting edge 80 is further provided at the front end of the fairing structure 50. It is convenient for the installation of the combustion chamber in this embodiment.

[0051] In some embodiments, the fairing structure 50 includes a fairing channel 51 and crescent-shaped guide vanes 52, and the crescent-shaped guide vanes 52 are evenly arranged around the fairing channel 51. As Figure 11 shown, the design parameters of the crescent-shaped guide vanes 52 include the windward surface parameters R3 - the front arc surface of the crescent front end, S3 - the inner arc surface of the crescent blade, the leeward surface parameters R4 - the rear arc surface of the crescent tail end, S4 - the outer arc surface of the crescent blade, and the design of the crescent-shaped guide vanes 52 is completed by combining multiple factors such as the intake angle, the swirl number SN, the intake area, and the throttling area.

[0052] In some embodiments, the combustion chamber casing 20 includes an inner combustion chamber casing 21 and an outer combustion chamber casing 22. The annular outer splitter plate 14 is fixedly connected to the outer combustion chamber casing 22, the annular inner splitter plate 12 is connected to the wall surface of the inner combustion chamber casing 21 through a Y-shaped support 30, and the end of the inner combustion chamber casing 21 is connected to the fish-shaped splitter plate 11.

[0053] As Figure 5 , Figure 6 shown, the annular inner splitter plate 12 is further connected to the wall surface of the inner combustion chamber casing 21 through a reinforcing rib 40.

[0054] In some embodiments, the air flow undergoes a first expansion through the double diffuser channel structure 10 and then a second expansion after entering the combustor casing 20. On the one hand, this can not only further improve the flow deceleration effect but also ensure the regulation of the flow rate of the flame tube 60 itself. On the other hand, in the case of a high Mach number incoming flow, the pressure loss can be reduced; specifically, it has the advantage of improving the combustion efficiency of the flame tube 60.

[0055] In some embodiments, the expansion angle of the first expansion is smaller than the expansion angle of the second expansion.

[0056] As Figure 6 shown, the first flow path 151 and the second flow path 152 of the diffuser achieve the first expansion of the air flow. After the air flow enters the combustor casing 20, the air flow achieves the second expansion. Figure 6 In, A1 is the expansion angle of the first flow path 151, which realizes the deceleration and pressure increase of the air flow in the first flow path 151; B1 is the expansion angle of the second flow path 152, which realizes the deceleration and pressure increase of the air flow in the second flow path 152.

[0057] The first expansion angle is A1 + B1, or the first expansion angle is A1 and B1.

[0058] The second expansion angle is A1 + B1 + A2 + B2, H or the second expansion angle is A3 (A1 + A2) and B3 (B1 + B2).

[0059] The fact that the expansion angle of the first expansion is smaller than the expansion angle of the second expansion should be understood as: A1 + B1 < A1 + B1 + A2 + B2; or A1 < A3 and B1 < B3.

[0060] In some embodiments, the fish-shaped splitter plate is provided with a test channel 111; as Figure 9 shown, where D1 represents the diameter of the test channel 111.

[0061] As Figure 9 shown, it is a cross-sectional view of a fish-shaped splitter plate in this embodiment, which is applicable to ultra-large flow rates and high Mach numbers, can achieve the function of rapid deceleration and pressure increase, and has strong anti-impact ability.

[0062] The windward side of the fish-shaped splitter plate 11 is designed with a small front-rounding and a large convex-rounding structure, and the leeward side is designed with a large convex-rounding and a small tail-rounding; when facing the oncoming flow with ultra-large flow rate and high Mach number, this structure has a large frontal area and obvious air flow resistance effect, which can quickly reduce the air flow velocity and allow the air flow to enter the combustion chamber at an appropriate speed for organized combustion; moreover, the proportion of the physical structure of this structure is large, and when facing the oncoming flow with high pressure, high Mach number and large flow rate, it has the characteristics of high strength and high stiffness, strong impact resistance, is not easy to deform, has a good connection effect on the inner and outer ring splitter plates and the casing, and has a long service life; at the same time, this structure is designed in combination with the test channel to meet the integrated functional requirements of diversion, support and testing.

[0063] Design requirements for structural parameters: Design of the front section of the windward side: The R1 fillet is a small tip-rounding design (the value of R1 ranges from 0.5 mm to 2.5 mm), which is used to realize the front wind-breaking structure and is easy to reduce the flow loss on the windward side (compared with the large-plane structure, the air flow pressure loss of the structure with the wind-breaking structure is significantly reduced); Design of the middle section of the windward side: Adopt a large convex-rounding structure, and the S1 curve is designed as an aerodynamic design curve, and the arc radius ranges from 5 mm to 35 mm, which is used for better diversion effect; Design of the front end of the leeward side: Adopt the S2 curve design that is smoothly transitioned with the middle section of the windward side. This structure still adopts a large convex-rounding structure, and the arc radius ranges from 15 to 55 mm, and there is a smooth straight-line transition, which is mainly used for further diversion, realizing the smooth transition of the air flow, preventing air flow separation, and reducing the flow loss; Design of the tail end of the leeward side: R2 adopts a small-rounding structure, and the fillet range is 0.3 to 1.5 mm, which is mainly used for the air flow end function, reducing air flow separation and reducing the flow loss.

[0064] As Figure 10 shown, it is a cross-sectional view of another fish-shaped splitter plate 11 in this embodiment, which is suitable for large flow rate and high Mach number, further reduces flow separation, reduces pressure loss, and has an obvious weight reduction effect, improving the thrust-to-weight ratio of the engine.

[0065] The windward side of the fish-shaped splitter plate 11 is designed with a small front-rounding and a large concave-rounding structure, and the leeward side is designed with a large concave-rounding and a small tail-rounding; when facing the oncoming flow with large flow rate and high Mach number, the pointed structure has a good wind-breaking effect and obvious front-end diversion effect. While reducing the air flow velocity, it reduces air flow separation, reduces the oncoming flow pressure loss, realizes a rapid reduction in the air flow velocity, and allows the air flow to enter the combustion chamber at an appropriate speed for organized combustion. This structure is designed in combination with the test channel to meet the integrated functional requirements of diversion, support and testing. At the same time, while meeting the requirements of the overall structural strength and stiffness, considering the lightweight design, the concave structure design effectively reduces the weight of the present invention, realizes the weight reduction of the overall component, and improves the thrust-to-weight ratio of the overall engine.

[0066] Structural parameter design requirements: Design of the front section of the windward side: A pointed nozzle structure is adopted. The R11 fillet is a small fillet at the tip (the value of R11 ranges from 1 mm to 3 mm). The pointed nozzle is used to achieve the function of breaking the wind at the front end, which is easy to reduce the flow loss; Design of the middle section of the windward side: A smooth flow guiding section and an inward concave curve structure (S11) are designed. The S11 curve is designed as an aerodynamic design curve, and the arc radius ranges from 5 mm to 20 mm, which is used for a better flow guiding effect; The flow guiding section is combined with the inward concave structure to further reduce the air flow separation and reduce the pressure loss on the windward side; Design of the front end of the leeward side: This structure adopts an inward concave large fillet structure, and the S22 curve design that is smoothly transitioned with the middle section of the windward side is adopted. The arc radius ranges from 15 to 40 mm, which is mainly used for further flow guiding, realizing a smooth transition of the air flow at the tail end, without air flow separation, and reducing the flow loss; Design of the tail end of the leeward side: R33 adopts a small fillet structure, and the fillet range is 0.3 to 1 mm, which is mainly used for the air flow finishing function, reducing the air flow separation and reducing the flow loss on the leeward side.

[0067] In some embodiments, the double diffuser channel structure 10 and the combustor casing 20 are integrally formed.

[0068] In some embodiments, the double diffuser channel structure 10, the combustor casing, and the Y-shaped support 30 are integrally formed.

[0069] In the second aspect of this embodiment, an engine is provided, including the combustor described above.

[0070] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0071] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside multiple elements or the interaction relationship between multiple elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the description of the present invention, it should be understood that all terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation on the present invention.

[0073] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combustor with double diffuser channels, characterized in that, It includes a double diffuser channel structure (10) and a combustor casing (20), and the outlet of the double diffuser channel structure (10) is connected to the inlet of the combustor casing (20); the double diffuser channel structure (10) includes a fish-shaped splitter (11), an annular inner splitter (12), an annular intermediate splitter (13) and an annular outer splitter (14); the annular inner splitter (12) is arranged inside the annular outer splitter (14) to form a flow passage (15) that gradually increases from the inlet to the outlet; at the inlet end of the flow passage (15), the annular inner splitter (12) and the annular outer splitter (14) are connected with a plurality of fish-shaped splitters, the head of the fish-shaped splitter faces the inlet of the combustor casing (20), and the tail of the fish-shaped splitter faces the outlet of the combustor casing (20); the tail is connected to the annular intermediate splitter (13) to divide the flow passage (15) into a first flow passage (151) and a second flow passage (152).

2. The combustor with a double diffuser channel according to claim 1, characterized in that, The annular intermediate splitter (13) is of a corrugated structure.

3. A combustor with a double diffuser passage according to claim 1 or 2, characterized in that, At the front end of the head of the fish-shaped splitter, a flow rectifying structure (50) is arranged.

4. A combustor with a double diffuser channel according to claim 3, characterized in that, The flow rectifying structure (50) includes a flow rectifying channel (51) and crescent-shaped guide vanes (52), and the crescent-shaped guide vanes (52) are evenly arranged around the flow rectifying channel (51).

5. A combustor with a double diffuser passage according to claim 1 or 2, characterized in that, The combustor casing (20) includes an inner combustor casing (21) and an outer combustor casing (22), the annular outer splitter (14) is fixedly connected to the outer combustor casing (22), the annular inner splitter (12) is connected to the wall surface of the inner combustor casing (21) through a Y-shaped support (30), and the end of the inner combustor casing (21) is connected to the fish-shaped splitter (11).

6. The combustor with a double diffuser channel according to claim 5, characterized in that The air flow is first expanded through the double diffuser channel structure (10) and then expanded for the second time after entering the combustor casing (20).

7. A combustor with a double diffuser passage according to claim 6, characterized in that, The expansion angle of the first expansion is smaller than that of the second expansion.

8. A combustor with a double diffuser passage according to claim 5, characterized in that, The fish-shaped splitter is provided with a test channel (111).

9. A combustor with a double diffuser channel according to claim 5, characterized in that, The double diffuser channel structure (10) and the combustor casing (20) are integrally formed.

10. An engine, characterized in that, It includes a combustor (3) as described in any one of claims 1-9.

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