CN113357670A - Air cooling and shielding integrated afterburner - Google Patents
Air cooling and shielding integrated afterburner Download PDFInfo
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- CN113357670A CN113357670A CN202110561663.0A CN202110561663A CN113357670A CN 113357670 A CN113357670 A CN 113357670A CN 202110561663 A CN202110561663 A CN 202110561663A CN 113357670 A CN113357670 A CN 113357670A
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- guide support
- flow
- flow guide
- support plate
- afterburner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
- F23R3/18—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Engines (AREA)
Abstract
The application provides an integrated afterburner is sheltered from to air cooling includes: a diffuser case; an inner cone disposed within the diffuser case; the flame stabilizer is arranged at the rear end of the guide support plate, wherein the guide support plate extends in a bending and twisting shape along the axis direction of the engine, so that the front end of the guide support plate and the rear end of the guide support plate deflect a preset angle in the circumferential direction to form a shielding structure; the fuel injection rod extends into the flow guide support plate, and the fuel injection rods outside the diffuser casing are communicated through an annular fuel main pipe; the converging ring is arranged on the flow guide support plate and divides a flow channel between the diffuser casing and the inner cone into a fuel gas flow channel and a cold gas flow channel, fuel gas flows into the fuel gas flow channel and is mixed and combusted with fuel oil flowing out of the oil injection rod, one part of cold gas flows into the cold gas flow channel, and the other part of cold gas flows into the flow guide support plate from a connecting through hole arranged on the converging ring to form a cooling flow path.
Description
Technical Field
The application belongs to the technical field of aero-engines, and particularly relates to an air-cooled shielding integrated afterburner.
Background
As shown in fig. 1, which is a schematic structural diagram of an afterburner of a typical military aircraft engine, an oil injection system 11 and a stabilization system 12 are arranged inside an afterburner 10, but a cooling design is not provided, so that the tail temperature of the afterburner is higher, high-temperature afterburner internal parts can be directly seen from the rear of a spray pipe, and the stealth performance is poor.
In order to overcome the above problems, the prior art has proposed a more advanced structure of an afterburner of an aircraft engine, as shown in fig. 2 to 3, a splitter ring 15 is provided at the front end of the afterburner, the splitter ring 15 is supported on a cone body through a support plate 14, and the front end of the splitter ring is provided with a turbine blade 13. The flow channel is divided into an inner part and an outer part by the splitter ring 15, the outer flow channel flows cold air, the inner flow channel flows high-temperature fuel gas, and the cold air can flow into the inner part from the oil injection system, so that a certain cooling effect can be achieved on the inner structure.
However, the structure can not realize effective shielding of turbine parts, and high-temperature turbine support plates, turbine blades and other parts can still be seen from the rear A direction of the nozzle, so that the backward infrared and radar stealth performance of the nozzle is poor.
Therefore, there is a need for a new afterburner to effectively shield the front high-temperature turbine components and to effectively cool the afterburner itself, and to improve the rear stealth capability of the engine by designing the afterburner to be invisible to radar.
Disclosure of Invention
It is an object of the present application to provide an air cooled shrouded integrated afterburner that solves or mitigates at least one of the problems of the background art.
The technical scheme of the application is as follows: an air-cooled shrouded integrated afterburner comprising:
the diffuser casing is used for bearing force;
an inner cone disposed within the diffuser case;
the flame stabilizer is arranged at the rear end of the guide support plate, wherein the guide support plate extends in a bending and twisting shape along the axis direction of the engine, so that the front end of the guide support plate and the rear end of the guide support plate deflect by a preset angle in the circumferential direction to form a shielding structure; and
the fuel spray rod extends into the flow guide support plate from the outer side of the diffuser casing, and the fuel spray rods outside the diffuser casing are communicated through an annular fuel main pipe;
the flow guide support plate is provided with a flow combining ring, the flow channel between the diffuser casing and the inner cone is divided into a fuel gas flow channel and a cold gas flow channel by the flow combining ring, high-temperature fuel gas flows into the fuel gas flow channel and is mixed and combusted with fuel oil flowing out of the oil injection rod, one part of low-temperature cold gas flows into the cold gas flow channel, and the other part of low-temperature cold gas flows into the flow guide support plate from a communicating hole formed in the flow combining ring to form a cooling flow channel.
Furthermore, a plurality of the water conservancy diversion extension boards are in the equipartition in circumference.
In the preferred embodiment of this application, the water conservancy diversion extension board includes relative left side board and the right side board that sets up, left side board and right side board formula wallboard bending type as an organic whole form, and have predetermined interval between left side board and the right side board, be equipped with the bottom plate in the bottom of left side board and right side board.
Furthermore, the upper portions of the left side plate and the right side plate are provided with mounting seats, and the mounting seats are used for mounting pull rods.
Furthermore, the height of the flow guide support plate is gradually increased from the front end to the rear end, so that the culvert flow channel forms diffusion and speed reduction.
In an embodiment of the present application, the flame holder is detachably connected to the flow guide support plate.
In another embodiment of the present application, the flame holder and the flow guiding plate are of a one-piece structure.
In one embodiment of the present application, the inner cone, the flow guide plate and the flame holder are provided with a plurality of cooling holes.
In one embodiment of the present application, an anti-vibration heat shield is provided at the end of the flow guide plate, and is mounted to the diffuser case
Furthermore, a cooling vibration-proof hole is formed in the vibration-proof heat shield, and the cooling vibration-proof hole forms a cooling channel for separating the diffuser casing from the boosting flame.
The gas shelters from integration afterburner can be under the condition that need not change turbine part, through the self design to afterburner, realize sheltering from entirely the back vision of turbine part, strengthen afterburner self's cooling effect simultaneously, improved the stealthy ability in the back of engine.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
FIG. 1 is a schematic view of a prior art afterburner without internal cooling structures.
FIG. 2 is a schematic view of a prior art afterburner with internal cooling.
Fig. 3 is a view from direction a of fig. 2.
FIG. 4 is a schematic view of an air-cooled shrouded integrated afterburner according to the present application.
Fig. 5 is a front perspective view of the flow guide plate according to the present application.
Fig. 6 is a perspective view of a rear direction of the flow guide plate according to the present application.
Fig. 7 is a schematic view of the flow guiding plate according to the B-direction view in fig. 4.
FIG. 8 is a schematic view of the air-cooled shrouded integrated afterburner from view B of FIG. 4.
FIG. 9 is a schematic view of a flame holder configuration of the subject application.
FIG. 10 is a schematic view of the air-cooled shrouded integrated afterburner air path blending of the present application.
Reference numerals:
20-afterburner
21-diffuser casing
22-confluence ring
23-flow guiding support plate, 231-left side plate, 232-right side plate, 233-bottom plate, 234-vent hole and 235-mounting seat
24-stabilizer, 241-connection hole
25-inner cone
26-fuel manifold
27-oil spray rod
28-Heat shield
29-pull rod
Detailed Description
In order to make the implementation objects, technical solutions and advantages 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 order to overcome the problem that the afterburner in the prior art is difficult to realize the full shielding of parts in the front (taking the airflow direction as a reference, the front or the left side refers to the inlet direction of the combustor, and the rear or the tail refers to the outlet direction of the combustor) so as to cause the poor self-hiding capability, the application provides an air-cooling shielding integrated afterburner.
The air-cooled sheltering integrated afterburner 20 provided by the application is integrally installed at a turbine outlet and mainly comprises a diffuser casing 21, an inner cone 25, a converging ring 22 and a flow guide supporting plate 23, a cold air flow channel is formed between the diffuser casing 21 and the converging ring 22, a diffusion flow path of an inner contained high-speed air flow is formed between the inner cone 25 and the converging ring 22, the inner contained high-speed air flow is gradually diffused and reduced in speed in the flow path, when the air flow reaches the tail edge of the flow guide supporting plate 23, the air flow speed is reduced to a range capable of stabilizing tissue combustion, then fuel oil is sprayed in the air flow, a flame stabilizer 24 at the tail edge of the flow guide supporting plate 23 is utilized to perform tissue combustion on the air flow and the fuel oil, the air flow temperature is further increased, and the engine generates larger thrust.
Specifically, as shown in fig. 4, the air-cooled shielded integrated afterburner 20 provided by the present application includes a diffuser casing 21, a converging ring 22, a flow guide support plate 23, a flame stabilizer 24, an inner cone 25, an oil injection device, and the like.
The diffuser casing 21 is the outermost casing of the afterburner and mainly plays a role in bearing force, all parts in the afterburner are directly or indirectly arranged on the diffuser casing 21, and the outer wall of the diffuser casing 21 is responsible for the whole bearing force and force transmission system and forms an outer flow path of the afterburner.
An inner cone 25 is disposed within the diffuser casing 21 at the centermost portion of the afterburner, and is secured to the diffuser casing 21 by a plurality of flow guide support plates 23 to define the inner wall surface of the culvert flow passage. The inner cone is subjected to radar stealth modification design so as to improve radar stealth performance.
The flow guiding plate 23 is a core component of the afterburner, and has a plurality of, in this embodiment, 16, which are circumferentially and uniformly distributed on the inner cone 25, and the outer side of the flow guiding plate 23 is connected to the diffuser casing 21 through a pull rod 29, so that the body and the inner cone 25 are relatively fixed.
The inside of the flow guide support plate 23 is designed to be hollow, so that the afterburning oil spray rod 27 can be installed or integrated in the flow guide support plate 23, meanwhile, cooling air of an outer duct can be introduced into the afterburning chamber, the flow guide support plate 23, the oil spray rod 27 integrated with the flow guide support plate 23, the flame stabilizer 24 arranged at the tail part of the flow guide support plate 23, the inner cone 25 and the like are cooled, the wall temperature of parts in the afterburning chamber is reduced, the parts in the afterburning chamber are prevented from being ablated, and infrared radiation is reduced.
As shown in fig. 5 to 7, the guide support plate 23 is integrally designed to be a three-dimensional cranked structure (similar to an engine blade), that is, the guide support plate 23 extends in a cranked manner along the axis direction of the engine, so that the front end of the guide support plate 23 and the rear end of the guide support plate deflect by a predetermined angle in the circumferential direction to form a shielding structure, thereby fully shielding the front high-temperature turbine component, and simultaneously rectifying the airflow with the surplus rotation at the turbine outlet, so that a stable and smooth airflow is formed when the airflow reaches the trailing edge of the flame stabilizer 24, which is beneficial to tissue combustion.
It should be noted that the above-mentioned deflection angle is suitable, and the suitable angle means that the angle can deflect the turbine outlet airflow properly, and the minimum flow resistance loss, as seen from the direction B in fig. 4, the rear end of the flow guiding support plate 23 can realize the full shielding of the front end turbine component. The deflection angle should not be too large, which would lead to an increase in flow resistance.
In a preferred embodiment of the present application, the flow guiding plate 23 is formed by bending a single plate to form a left side plate 231 and a right side plate 232 which are opposite to each other, the left side plate 231 and the right side plate 232 are substantially mirror images, a certain space is formed between the left side plate 231 and the right side plate 232 to form a hollow structure, and a bottom plate 233 is disposed at the bottom of the left side plate 231 and the right side plate 232.
In a further embodiment of the above solution, the upper parts of the left 231 and right 232 side plates are provided with mounting seats 234, the mounting seats 234 being used for mounting the tie rods 29.
A plurality of water conservancy diversion extension boards 23 in this application with the even branch into a plurality of parts of the connotation air current of turbine export to the lateral wall of connotation diffusion flow path has been formed. The plurality of flow directing struts 23 may completely obscure the forward turbine components from view from the rear, as shown in fig. 8.
In this application, the flow guide support plate 23 and the flame holder 24 may be a split structure, that is, the flow guide support plate 23 and the flame holder 24 may be detachably connected by a connecting member, for example, as shown in fig. 9, the flame holder 24 is an independent structure, a connecting hole 241 is provided at an edge of the flame holder, a connecting hole is also provided at a corresponding position of the flow guide support plate 23, and the flow guide support plate 23 and the flame holder are connected by a bolt. However, in the preferred embodiment of the present application, the flow guiding plate 23 and the flame stabilizer 24 may be designed as an integral structure, that is, the trailing edge of the flow guiding plate 23 is designed as a blunt body structure to serve as the flame stabilizer 24, so that the functions of stabilizing the airflow and organizing the combustion can be achieved.
It should be noted that no matter the water conservancy diversion extension board 23 is split type structure or integral type structure with flame holder 24, flame holder 24 all carries out the radar and repaiies the type design, and it is specific angle with the engine axis to can reduce the radar reflection, improve radar stealthy performance.
The fuel injection device of the afterburner mainly comprises a fuel manifold 26 and fuel injection rods 27, wherein the fuel manifold 26 is of an annular structure and is arranged on the outer side of the diffuser casing 21, the fuel injection rods 27 are provided with a plurality of groups, the number of the fuel injection rods 27 is generally consistent with that of the guide support plates 23, the fuel injection rods 27 are fixedly arranged on the diffuser casing 21 and are integrally inserted into the guide support plates 23, and the outer ends of the fuel injection rods 27 are communicated with the fuel manifold 26. The fuel spray rod 27 sprays fuel to both side plates of the guide support plate 23, and the fuel reaches a back flow area of the flame stabilizer 24 after being sprayed out to participate in combustion.
A flow combining ring 22 is fixedly mounted on the flow guide support plate 23 and used for separating the inner culvert airflow and the outer culvert airflow. The merging ring 22 and the inner cone 23 form a fuel gas flow path, and the merging ring 22 and the diffuser casing 21 form a cooling gas flow path.
Referring to fig. 4, in order to realize the diffusion and reduction speed of the culvert flow path more quickly, the height of the flow guide support plate 23 gradually increases from the front end to the rear end, and meanwhile, the converging ring 22 is designed into a curved surface shape matched with the converging ring and extends from the inlet of the afterburner to the tail edge of the flow guide support plate 23, so that the diffusion and reduction speed of the culvert flow path is formed between the converging ring 22 and the flow guide support plate 23, the diffusion flow path is reasonable, and no pneumatic separation is generated.
As shown in fig. 10, since the flow guiding support plate 23 in the present application has a hollow structure, by providing some communication holes (not shown) in the circumferential direction of the merging ring 22, the flow guiding support plate 23 can introduce a part of the cooling air in the bypass between the merging ring 22 and the diffuser casing 21 into the flow guiding support plate 23, so as to cool the flow guiding support plate 23 itself, the inner cone 25 integrated with or fixed to the flow guiding support plate 23, the stabilizer 24, the oil injection rod 27, and the like, thereby improving the cooling efficiency and reducing the wall temperature of the components in the afterburner.
It should be noted that the inner cone 25, the flow guide plate 23 and the flame holder 24 of the present application may also be provided with a plurality of vent holes 234 to reduce the temperature of the wall structure.
The outer culvert air current and the inner culvert air current in the scheme of the application do not have clear and single mixed cross section any more, and the outer culvert air current gradually participates in the inner culvert air current along with the cooling flow path and participates in the tissue combustion.
Finally, in the afterburner of the present application, the guide support plate 23 may further include an anti-vibration heat shield 28 at the rear thereof, which is mounted to the diffuser casing 21 via a spacer to separate the diffuser casing 21 from the afterburner flame, thereby performing cooling and heat insulation functions and suppressing the oscillatory combustion.
In one embodiment of the present application, the vibration-isolating heat shield 28 may be a large thin-walled component having cooling and vibration-isolating apertures formed therein, such that cooling air between the converging ring 22 and the diffuser casing 21 can flow through the apertures, thereby enhancing cooling and heat-isolating effects.
The air-cooled sheltering integrated afterburner has no obvious mixing section of inner and outer culvert air flows, one part of the outer culvert air flow enters the direct cooling channel of the anti-vibration heat shield 28 and the diffuser casing 21 and seeps out from the cooling hole of the anti-vibration heat shield 28 along the way, so that the anti-vibration heat shield is cooled, and the main flow is gradually added to participate in combustion. The other part of the outer contained airflow enters the hollow flow guide support plate 23 and flows out from the cooling holes densely distributed on the flow guide support plate 23, the flame stabilizer 24 and the inner cone 25 to form air film cooling, so that the parts in the afterburner are cooled and flow into the main flow channel to participate in combustion.
The air cooling shelters from integration afterburner under the condition that need not change turbine part (turbine blade, turbine back extension board etc.) through afterburner self design, realizes sheltering from the back vision of turbine part entirely, strengthens afterburner self's cooling simultaneously to take the stealthy design of inner part radar, improve the stealthy ability of the back of engine.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An air cooled shrouded integrated afterburner, said combustor comprising:
a diffuser casing (21) for bearing force;
an inner cone (25) disposed inside the diffuser case (21);
the device comprises a plurality of hollow flow guide support plates (23) mounted on an inner cone (25), wherein the flow guide support plates (23) are connected to a diffuser casing (21) through pull rods (29), and flame stabilizers (24) are arranged at the rear ends of the flow guide support plates (23), wherein the flow guide support plates (23) extend in a bending and twisting manner along the axis direction of an engine, so that the front ends of the flow guide support plates (23) and the rear ends of the flow guide support plates deflect by a preset angle in the circumferential direction to form a shielding structure; and
the fuel spray rod (27) extends into the flow guide support plate (23) from the outer side of the diffuser casing (21), and the fuel spray rod (27) outside the diffuser casing (21) is communicated through an annular fuel main pipe (26);
the flow guide support plate (23) is provided with a flow combining ring (22), the flow channel between the diffuser casing (21) and the inner cone (25) is divided into a fuel gas flow channel and a cold gas flow channel by the flow combining ring (22), high-temperature fuel gas flows into the fuel gas flow channel and is mixed and combusted with fuel oil flowing out of the fuel spray rod (2), one part of low-temperature cold gas flows into the cold gas flow channel, and the other part of low-temperature cold gas flows into the flow guide support plate (23) from a communicating hole formed in the flow combining ring (22) and is used for forming a cooling flow channel.
2. The air-cooled shrouded integrated afterburner of claim 1 wherein a plurality of said flow directing struts (23) are circumferentially equispaced.
3. The air-cooled shielded integrated afterburner according to claim 1 or 2, wherein the flow guide support plate (23) comprises a left side plate (231) and a right side plate (232) which are arranged oppositely, the left side plate (231) and the right side plate (232) are formed by bending an integrated wall plate, a predetermined interval is formed between the left side plate (231) and the right side plate (232), and a bottom plate (233) is arranged at the bottom of the left side plate (231) and the right side plate (232).
4. The air-cooled shrouded integrated afterburner of claim 3 wherein the upper portions of the left side plate (231) and the right side plate (232) are provided with mounting seats (234), said mounting seats (234) being adapted to receive tie rods (29).
5. The air-cooled shield-integrated afterburner according to claim 4, wherein the height of the flow guiding plate (23) is gradually increased from the front end to the rear end, so that the diffusion and speed reduction of the culvert flow channel are realized.
6. The air-cooled shrouded integrated afterburner of claim 1 wherein the flame holder (24) is removably attached to the flow guide plate (23).
7. The air-cooled shrouded integrated afterburner of claim 1 wherein the flame holder (24) and flow guide plate (23) are of one-piece construction.
8. The air-cooled shielded integrated afterburner of claim 1, wherein a plurality of vent holes are provided in the inner cone (25), the flow guide plate (23) and the flame holder (24).
9. Air-cooled shrouded integrated afterburner according to claim 1, wherein an anti-vibration heat shield (28) is provided at the end of the flow guide plate (23), said anti-vibration heat shield (28) being mounted to the diffuser casing (1).
10. The air-cooled shrouded integrated afterburner as claimed in claim 9 wherein the heat shield (28) is perforated with cooling baffle holes forming cooling channels for separating the diffuser case (1) from the afterburner flame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110561663.0A CN113357670A (en) | 2021-05-23 | 2021-05-23 | Air cooling and shielding integrated afterburner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110561663.0A CN113357670A (en) | 2021-05-23 | 2021-05-23 | Air cooling and shielding integrated afterburner |
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| CN113357670A true CN113357670A (en) | 2021-09-07 |
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| CN202110561663.0A Pending CN113357670A (en) | 2021-05-23 | 2021-05-23 | Air cooling and shielding integrated afterburner |
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| CN114165815A (en) * | 2021-10-20 | 2022-03-11 | 中国航发四川燃气涡轮研究院 | Pull rod device for compensating thermal deformation |
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| CN115013839A (en) * | 2022-05-12 | 2022-09-06 | 中国航发四川燃气涡轮研究院 | Afterburning chamber fuel spray lance structure |
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