An afterburner with a radial stabilizer as the main body

Abstract

This application belongs to the field of aeroengines, and particularly relates to an afterburner with a radial stabilizer as the main body. In the afterburner with a radial stabilizer as the main body of this application, multiple circumferentially evenly distributed radial stabilizers 2 are used as the main load-bearing members of the internal diffuser and flame stabilization structure of the afterburner, which can effectively ensure the dimensional accuracy and working stability of the outer bypass outlet; the trailing edge of the confluence ring 4 is fixed to the radial stabilizer 2, and the leading edge of the confluence ring 4 and the rear turbine casing adopt an axially inserted floating structure. While effectively ensuring the dimensional accuracy and stability of the outer bypass outlet, the problem of inconsistent thermal displacement between the confluence ring 4 and the casing can be avoided; the flame transfer ring 3 is directly integrated with the radial stabilizer 2, but a telescopic joint is reserved between adjacent flame transfer ring segments, which can avoid the problem of inconsistent thermal displacement directions between the flame transfer ring 3 and the radial stabilizer 2; the afterburner main pipe 6 is arranged outside the casing, which can avoid causing unnecessary outer bypass flow losses.

Description

Technical Field

[0001] This application belongs to the field of aeroengines, and particularly relates to an afterburner with a radial stabilizer as the main body. Background Art

[0002] In order to achieve high performance and low weight, turbofan engines have put forward strict index requirements for the total pressure recovery coefficient, total excess air coefficient, structural length, etc. of the afterburner. In addition, in order to further improve the engine performance, higher index requirements have been put forward for the diffuser section length, weight and reliability. The most critical index is that the bypass area is further reduced by about 35%.

[0003] The traditional afterburner structure has the following problems:

[0004] 1. In the traditional afterburner structure, the confluence ring is a cantilever structure fixed at the front end. In the new aerodynamic scheme, the large expansion design of the confluence ring increases the axial length of the confluence ring. The cantilever fixing method not only greatly reduces the structural reliability, but also cannot guarantee the dimensional stability of the trailing edge of the confluence ring;

[0005] 2. In the traditional afterburner structure, the fuel manifold is mostly arranged inside the casing. The large expansion confluence ring greatly compresses the bypass flow path space and cannot arrange the fuel manifold. Moreover, the temperature in the core flow path is extremely high, and the fuel manifold cannot be arranged either;

[0006] 3. The core temperature of a high-performance turbofan engine is relatively high. After the annular stabilizer is completely placed in the core, cooling design is required. However, the annular stabilizer is far from the bypass and cannot directly use the low-temperature bypass air for cooling;

[0007] 4. The core temperature of a high-performance turbofan engine is relatively high. The annular stabilizer has poor thermal expansion coordination ability, which is likely to bring high thermal stress and affect the component life.

[0008] Therefore, it is desirable to have a technical solution to overcome or at least mitigate at least one of the above defects of the prior art. Summary of the Invention

[0009] The purpose of this application is to provide an afterburner with a radial stabilizer as the main body to solve at least one problem existing in the prior art.

[0010] The technical solution of this application is as follows:

[0011] An afterburner with a radial stabilizer as the main body includes:

[0012] A diffuser casing;

[0013] Confluence ring, the confluence ring is nested inside the diffuser casing, an outer annulus passage is formed between the confluence ring and the diffuser casing, an inner annulus passage is formed inside the confluence ring, the leading edge of the confluence ring is inserted and matched with the turbine rear casing, and a plurality of slots are evenly arranged along the circumferential direction at the trailing edge of the confluence ring;

[0014] Radial stabilizers, including a plurality of them, the radial stabilizers are cooperatively arranged in the slots at the trailing edge of the confluence ring and fixedly connected to the confluence ring, and the radially outer ends of the radial stabilizers are connected to the diffuser casing. The inside of the radial stabilizer has a first cavity, and first through holes are formed on the radial stabilizer to communicate the first cavity with the outer annulus passage and the inner annulus passage respectively;

[0015] Flame transmission ring, the flame transmission ring includes a plurality of flame transmission ring segments arranged along the circumferential direction. The flame transmission ring segments are respectively and cooperatively installed on the radial stabilizers, and a telescopic joint is reserved between adjacent two flame transmission ring segments. The inside of the flame transmission ring segment has a second cavity communicated with the first cavity, and second through holes are formed on the flame transmission ring segment;

[0016] Afterburner spray bar, the afterburner spray bar is fixedly installed on the diffuser casing. One end of the afterburner spray bar is connected to an afterburner main pipe located outside the diffuser casing, and the other end is accommodated in the first cavity of the radial stabilizer. An oil injection port is also formed on the radial stabilizer;

[0017] Inner cone, the inner cone is nested inside the confluence ring, and the leading edge of the inner cone is fixedly connected to the turbine rear casing;

[0018] Vibration-proof and heat-insulating screen, the vibration-proof and heat-insulating screen is nested inside the diffuser casing and fixedly connected to the diffuser casing. The vibration-proof and heat-insulating screen is located behind the confluence ring in the axial direction and between the confluence ring and the diffuser casing in the radial direction, and the vibration-proof and heat-insulating screen and the confluence ring have an overlapping part with a predetermined length in the radial direction.

[0019] In at least one embodiment of the present application, a reinforcing rib is provided in the middle of the confluence ring, and the reinforcing rib is connected to the diffuser casing.

[0020] In at least one embodiment of the present application, the slot of the confluence ring includes a guiding section and a plugging section, and the plugging section is provided with a mounting edge for cooperatively connecting with the radial stabilizer.

[0021] In at least one embodiment of the present application, the radial stabilizers include two length specifications, and the radial stabilizers with the two length specifications are arranged at intervals along the circumferential direction.

[0022] In at least one embodiment of the present application, a plurality of first through holes for connecting the first cavity and the inner connotation channel are uniformly formed in the radial stabilizer along the radial direction.

[0023] In at least one embodiment of the present application, the flame transfer ring section and the corresponding radial stabilizer are integrally formed.

[0024] In at least one embodiment of the present application, the afterburner main pipe includes a main pipe body portion and a main pipe joint portion, and the afterburner spray bar is connected to the main pipe joint portion through a threaded structure.

[0025] The invention has at least the following beneficial technical effects:

[0026] The afterburner with a radial stabilizer as the main body in the present application can ensure the stability of the outer connotation area, reduce the stress of the fuel supply system, ensure the cooling conditions of internal parts, and the thermal expansion coordination relationship of the combined structure of the radial stabilizer and the flame transfer ring. It is a stable and reliable structural design scheme applicable to a radial flame transfer integrated pneumatic flow path with an extremely small outer connotation mixing area. Description of the Drawings

[0027] Figure 1 is a solid diagram of an afterburner with a radial stabilizer as the main body in an embodiment of the present application;

[0028] Figure 2 is an assembly diagram of a radial stabilizer in an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of a confluence ring in an embodiment of the present application.

[0030] Wherein:

[0031] 1 - diffuser casing; 2 - radial stabilizer; 3 - flame transfer ring; 4 - confluence ring; 5 - afterburner spray bar; 6 - afterburner main pipe; 7 - inner cone; 8 - vibration-proof heat insulation screen. Detailed Embodiments

[0032] To make the purpose, technical solutions, and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 therefore should not be construed as limiting the protection scope of the present application.

[0034] The following will further elaborate on the present application in conjunction with the Figures 1 to 3 drawings.

[0035] The present application provides an afterburner with a radial stabilizer as the main body, including: a diffuser casing 1, a confluence ring 4, a radial stabilizer 2, a flame transfer ring 3, an afterburner spray bar 5, an inner cone 7, and a vibration-proof heat insulation screen 8.

[0036] Specifically, referring to Figure 1 , the diffuser casing 1 is used to form the outer flow path of the afterburner and is also the basic load-bearing structure of the afterburner. The confluence ring 4 is nested inside the diffuser casing 1. An outer bypass channel is formed between the confluence ring 4 and the diffuser casing 1, and an inner bypass channel is formed inside the confluence ring 4. The leading edge of the confluence ring 4 is inserted and matched with the rear turbine casing, and a plurality of slots are evenly arranged along the circumferential direction at the trailing edge of the confluence ring 4.

[0037] The number of the radial stabilizers 2 is the same as that of the slots of the confluence ring 4. The radial stabilizers 2 are arranged in the slots at the trailing edge of the confluence ring 4 in a matching manner and are fixedly connected to the confluence ring 4. The radially outer ends of the radial stabilizers 2 are connected to the diffuser casing 1. The inside of the radial stabilizers 2 has a first cavity, and the radial stabilizers 2 are provided with first through holes that respectively communicate the first cavity with the outer bypass channel and the inner bypass channel; the flame transfer ring 3 includes a plurality of flame transfer ring segments arranged along the circumferential direction. The flame transfer ring segments are respectively and correspondingly installed on the radial stabilizers 2, and a telescopic joint is reserved between adjacent two flame transfer ring segments. The inside of the flame transfer ring segments has a second cavity that communicates with the first cavity, and second through holes are provided on the rear end faces of the flame transfer ring segments.

[0038] The afterburner spray bar 5 is fixedly installed on the diffuser casing 1. One end of the afterburner spray bar 5 is connected to the afterburner main pipe 6 located outside the diffuser casing 1, and the other end is accommodated in the first cavity of the radial stabilizer 2. The afterburner spray bar 5 has fuel injection holes, and the radial stabilizer 2 is also provided with matching fuel injection ports; The use of an inserted afterburner spray bar 5 and an external afterburner main pipe 6 is one of the innovations of this afterburner. The afterburner spray bar 5 adopts a long spray bar structure and is directly fixedly installed with the diffuser casing 1. The afterburner main pipe 6 and the afterburner spray bar 5 adopt a split design. The afterburner main pipe 6 is arranged outside the casing. The afterburner main pipe 6 includes a main pipe body part and a main pipe connection part. The main pipe body part of the afterburner main pipe 6 adopts a flexible hose structure, and each afterburner spray bar 5 is connected to the main pipe connection part through a threaded structure.

[0039] Furthermore, the inner cone 7 is nested inside the confluence ring 4. The leading edge of the inner cone 7 is fixedly connected to the turbine rear casing and serves as the inner profile of the diffuser flow path for the core flow. The vibration-proof and heat-insulating screen 8 is nested inside the diffuser casing 1 and is fixedly connected to the diffuser casing 1. The vibration-proof and heat-insulating screen 8 is axially located behind the confluence ring 4 and radially located between the confluence ring 4 and the diffuser casing 1, and the vibration-proof and heat-insulating screen 8 and the confluence ring 4 have an overlapping part with a predetermined length in the radial direction. The vibration-proof and heat-insulating screen 8 is a large thin-walled part, mainly for cooling and heat insulation of the diffuser casing 1, and at the same time has the function of suppressing oscillating combustion.

[0040] For the afterburner with the radial stabilizer as the main body in this application, the confluence ring 4 adopts a connection form of front-end plugging and rear-end fixing. The leading edge of the confluence ring 4 and the turbine rear casing adopt a plugging and sealing structure. The trailing edge of the confluence ring 4 is connected to the radial stabilizer 2 to realize the overall fixation of the confluence ring 4. Fixing here can effectively maintain the stability of the trailing edge height of the confluence ring 4. Advantageously, in this embodiment, a rigid reinforcing rib is provided in the middle of the confluence ring 4, and the reinforcing rib is connected to the diffuser casing 1. The slot at the rear of the confluence ring 4 includes a diversion section and a plugging section. The diversion section can guide the cold air of the outer flow into the radial stabilizer 2, and the plugging section is used to accommodate the radial stabilizer 2, and an installation edge for cooperating with the radial stabilizer 2 is provided on the plugging section. The radial stabilizer 2 and the confluence ring 4 can be connected by fixing screws.

[0041] The afterburner with a radial stabilizer as the main body in this application. The radial stabilizer 2, as the main load-bearing structure, is one of the innovative points of this afterburner. Multiple radial stabilizers 2 are evenly distributed at the trailing edge of the mixing ring 4 and the mixing cross-section of the inner and outer bypass airflows, and together with the flame transfer ring 3, they form a "ring + radial" combined flame stabilization structure for organizing combustion. The radial stabilizer 2 is directly fixedly connected to the diffuser casing 1. The radial stabilizer 2 is designed as a hollow structure to provide an installation space for the afterburner spray bar 5. The radial stabilizer 2 is provided with a first through hole opposite to the guiding section of the mixing ring 4 in the outer bypass area to introduce outer bypass cold air into the afterburner spray bar 5 and the flame transfer ring 3. In this application, multiple circumferentially evenly distributed radial stabilizers 2 can have the same length or different lengths. In the preferred embodiment of this application, refer to Figure 2 , the radial stabilizer 2 includes two length specifications. The radial stabilizers 2 with the two length specifications are arranged at intervals in the circumferential direction. Multiple first through holes for connecting the first cavity and the inner channel are evenly opened in the radial direction on the radial stabilizer 2.

[0042] The afterburner with a radial stabilizer as the main body in this application. The structure of the flame transfer ring 3 located in the inner channel is one of the innovative points of this afterburner. The flame transfer ring 3 and the radial stabilizer 2 together form a "ring + radial" combined flame stabilization structure. The flame transfer ring 3 adopts a segmented structure. Each flame transfer ring segment is directly integrally formed with the corresponding radial stabilizer 2. The flame transfer ring 3 uses the second cavity inside to introduce outer bypass cold air through the radial stabilizer 2 to achieve its own cooling. A telescopic joint is provided between adjacent flame transfer ring segments to release the thermal expansion incoordination between the radial stabilizer 2 and the flame transfer ring 3.

[0043] In the afterburner with a radial stabilizer as the main body in this application, except for the inner cone, all the internal components of the afterburner are connected and fixed to the diffuser casing 1 through the radial stabilizer 2. At the outer bypass air outlet area, it is the connection and fixing point of the internal components. Using multiple circumferentially evenly distributed radial stabilizers 2 as the main load-bearing components of the internal diffuser and flame stabilization structure of the afterburner can effectively ensure the accuracy of the outer bypass outlet size and working stability; the trailing edge of the mixing ring 4 is fixed to the radial stabilizer 2, canceling the traditional fixed connection method between the leading edge of the mixing ring 4 and the turbine rear casing. The leading edge of the mixing ring 4 and the turbine rear casing adopt an axial plug-in floating structure. While effectively ensuring the accuracy and stability of the outer bypass outlet size, it can avoid the problem of thermal displacement incoordination between the mixing ring 4 and the casing; the flame transfer ring 3 is directly integrated with the radial stabilizer 2, but a telescopic joint is reserved between adjacent flame transfer ring segments, which can avoid the problem of inconsistent thermal displacement directions between the flame transfer ring 3 and the radial stabilizer 2; the afterburner main pipe 6 is arranged outside the diffuser casing 1, which can avoid causing unnecessary outer bypass flow losses; the afterburner main pipe 6 adopts a flexible hose structure, which can save layout space, reduce the volume of the main pipe, coordinate the thermal displacement incoordination between the pipeline and the casing, reduce dynamic stress, and extend the service life of the components.

[0044] The afterburner with a radial stabilizer as the main body in this application can solve the following defects existing in the prior art: The large-expansion design increases the axial length of the confluence ring. If the traditional front-mounted cantilever fixing method is adopted, not only will the structural reliability be greatly reduced, but also the dimensional stability of the trailing edge of the confluence ring cannot be guaranteed; The large-expansion confluence ring greatly compresses the outer flow path space, and the internal flow temperature is high, making it impossible to arrange the fuel manifold inside the casing; After the annular stabilizer is completely placed inside the internal flow, it is impossible to directly use the low-temperature outer flow cold air for cooling; In a high-temperature environment, the combined structure of the annular stabilizer is prone to bring higher thermal stress.

[0045] The afterburner with a radial stabilizer as the main body in this application has formed a structural design scheme of a radial afterburner with the radial stabilizer 2 as the main load-bearing member according to the design requirements of the aerodynamic scheme of the radial flame-transfer integrated afterburner, which can meet the realization of the overall outer flow area of the engine and the structural stability, and at the same time meet the requirements of structural reliability.

[0046] As described above, only the specific implementation manners of this application are provided, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. An afterburner with a radial stabilizer as the main body, characterized in that, Comprising: Diffuser casing (1); Confluence ring (4), the confluence ring (4) is nested inside the diffuser casing (1), an outer bypass passage is formed between the confluence ring (4) and the diffuser casing (1), an inner bypass passage is formed inside the confluence ring (4), the leading edge of the confluence ring (4) is inserted and cooperated with the turbine rear casing, and a plurality of slots are evenly arranged in the circumferential direction at the trailing edge of the confluence ring (4); Radial stabilizers (2), including a plurality of them, the radial stabilizers (2) are cooperatively arranged in the slots at the trailing edge of the confluence ring (4) and fixedly connected to the confluence ring (4), and the radially outer ends of the radial stabilizers (2) are connected to the diffuser casing (1), the inside of the radial stabilizers (2) has a first cavity, and the radial stabilizers (2) are provided with first through holes for communicating the first cavity with the outer bypass passage and the inner bypass passage respectively; Flame transfer ring (3), the flame transfer ring (3) includes a plurality of flame transfer ring segments arranged in the circumferential direction, the flame transfer ring segments are respectively and correspondingly installed on the radial stabilizers (2), a telescopic joint is reserved between adjacent two of the flame transfer ring segments, the inside of the flame transfer ring segment has a second cavity communicated with the first cavity, and the flame transfer ring segment is provided with a second through hole; Afterburner spray bar (5), the afterburner spray bar (5) is fixedly installed on the diffuser casing (1), one end of the afterburner spray bar (5) is connected to an afterburner main pipe (6) located outside the diffuser casing (1), and the other end is accommodated in the first cavity of the radial stabilizer (2), and the radial stabilizer (2) is also provided with an oil injection port; Inner cone (7), the inner cone (7) is nested inside the confluence ring (4), and the leading edge of the inner cone (7) is fixedly connected to the turbine rear casing; Vibration-proof and heat-insulating screen (8), the vibration-proof and heat-insulating screen (8) is nested inside the diffuser casing (1) and fixedly connected to the diffuser casing (1), the vibration-proof and heat-insulating screen (8) is located behind the confluence ring (4) in the axial direction and between the confluence ring (4) and the diffuser casing (1) in the radial direction, and the vibration-proof and heat-insulating screen (8) and the confluence ring (4) have an overlapping part with a predetermined length in the radial direction; Reinforcing ribs are arranged in the middle of the confluence ring (4), and the reinforcing ribs are connected to the diffuser casing (1); The slots of the confluence ring (4) include a diversion section and a plug-in section, and the plug-in section is provided with a mounting edge for cooperatively connecting with the radial stabilizer (2).

2. The afterburner with a radial stabilizer as the main body according to claim 1, characterized in that, The radial stabilizers (2) include two length specifications, and the radial stabilizers (2) with the two length specifications are arranged at intervals in the circumferential direction.

3. The afterburner with a radial stabilizer as the main body according to claim 2, characterized in that, A plurality of the first through holes for communicating the first cavity with the inner bypass passage are evenly opened in the radial direction on the radial stabilizer (2).

4. The afterburner with a radial stabilizer as the main body according to claim 1, characterized in that, The flame transfer ring segment and the corresponding radial stabilizer (2) are integrally formed.

5. The afterburner with a radial stabilizer as the main body according to claim 1, characterized in that The afterburner main pipe (6) includes a main pipe body part and a main pipe joint part, and the afterburner spray bar (5) is connected to the main pipe joint part through a threaded structure.

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