CN116658937A - A cavity plasma excitation integrated afterburner - Google Patents

Abstract

The invention discloses a cavity plasma excitation integrated afterburner, which includes a casing, a radial flame stabilizer, an inner cone and a plasma igniter, and the casing includes an afterburner casing and an inner channel The casing, the annular passage enclosed between the afterburner casing and the inner casing is the outer passage; the radial flame stabilizer runs through the entire outer passage; the annular passage surrounded by the inner cone and the inner casing For the inner channel, the end of the inner cone close to the exhaust flame of the engine is provided with a cavity, and the plasma igniter is located at the root of the radial flame stabilizer close to the cavity of the inner cone. The inner cone of the present invention and the casing together form a channel for the flow of air. Concavity on the rear side of the inner cone to create a small recirculation zone. Plasma igniters are arranged on both sides of the concave cavity, and the plasma igniter can directly act on the combustion process of the fuel/air mixture in the concave cavity to form a joint flame and improve the stability of combustion.

Description

A cavity plasma excitation integrated afterburner

technical field

The invention belongs to the technical field of aero-engines and gas turbines, and in particular relates to a cavity plasma excitation integrated afterburner.

Background technique

The afterburner can inject fuel into the gas flowing out of the turbine for re-combustion under certain circumstances, increase the thrust of the engine in a short time, and give the aircraft a speed advantage. It has been widely used and developed in the field of aeroengines.

At present, the afterburner of aero-engines has practical problems such as size, weight, high fuel consumption, difficulty in ignition, and easy oscillation and combustion. The new integrated afterburner can improve the ignition capability of aero-engines, reduce fluid resistance, and improve combustion efficiency. etc. have obvious advantages. Due to the huge advantages and prospects of the integrated afterburner, relevant research work has been carried out at home and abroad. The F120 and F110 engines developed by GE have preliminarily realized the integrated design of the support plate-mixer-stabilizer-fuel injection rod, which mainly includes the integration of the support plate and fuel injection rod and the mixer and radial/ring stabilizer integration. In addition, Pratt & Whitney has adopted an integrated design scheme of the turbine rear frame, which is currently the most integrated afterburner scheme.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art, and to provide a cavity plasma excitation integrated afterburner, in which the inner cone and the casing together form a passage for air flow. Concavity on the rear side of the inner cone to create a small recirculation zone. There are plasma igniters on both sides of the concave cavity, which can directly act on the combustion process of the fuel/air mixture in the concave cavity, and use the plasma rich in active particles to accelerate the ignition and combustion process, which improves the combustion efficiency. stability.

In order to solve the above problems, the present invention provides a cavity plasma excitation integrated afterburner. The present invention is achieved through the following technical solutions: a cavity plasma excitation integrated afterburner, which is characterized in that it includes a casing, a radial flame stabilizer, an inner cone and a plasma igniter;

The casing includes an afterburner casing and an inner tunnel casing, the afterburner casing is used to separate the outside world from the inside of the engine, and the inner tunnel casing is arranged on the afterburner casing Inside, the annular channel enclosed between the afterburner casing and the inner channel casing is an outer duct;

The radial flame holder runs through the entire outer duct, and the outermost side of the radial flame holder is connected to the afterburner casing;

The inner cone is arranged inside the inner cone, the annular passage surrounded by the inner cone and the inner channel is the inner channel, the inner side of the radial flame stabilizer is connected with the inner cone, the The end of the inner cone close to the exhaust flame of the engine is provided with a concave cavity;

The plasma igniter is located at the root of the radial flame stabilizer near the concave cavity of the inner cone.

The above-mentioned concave cavity plasma excitation integrated afterburner is characterized in that: the positive pole of the plasma igniter is located on the side of the concave cavity close to the root of the radial flame stabilizer, and the negative pole of the plasma igniter is located on the side of the concave cavity The side of the chamber away from the root of the radial flame holder.

The above-mentioned concave cavity plasma excitation integrated afterburner is characterized in that: the concave cavity plasma excitation integrated afterburner further includes a support plate, the support plate is arranged on the outside of the inner cone and It is connected to the front side of the radial flame holder.

The above-mentioned concave cavity plasma excitation integrated afterburner is characterized in that: the concave cavity plasma excitation integrated afterburner also includes an oil delivery ring, an oil injection rod and a fuel injection nozzle, and the delivery The oil ring is arranged on the outside of the afterburner casing; one end of the fuel injection rod communicates with the oil delivery ring outside the afterburner casing; the fuel injection nozzle communicates with the fuel injection rod;

Wherein, the radial flame stabilizer is provided with a hollow cavity, and the other end of the fuel injection rod extends into the inner cone after passing through the hollow cavity of the radial flame stabilizer, and the radial flame stabilizer The rear part and the rear end surface of the two sides of the device are provided with an oil nozzle through hole communicating with the hollow cavity, and the oil injection nozzle is arranged in the oil injection nozzle through hole and connected to the hollow cavity. The fuel injection rod is connected.

The above-mentioned concave cavity plasma excitation integrated afterburner is characterized in that: there are vent holes on the radial flame stabilizer, and the vent holes are located on the two sides and the rear of the radial flame stabilizer. On the end face, and the vent hole is located at the front side and the rear side of the corresponding through hole of the fuel injector.

The above-mentioned concave cavity plasma excitation integrated afterburner is characterized in that: the support plate is integrally arranged around the cone, and the support plate-cavity adopts an integrated design.

The above-mentioned concave cavity plasma excitation integrated afterburner is characterized in that: the concave cavity plasma excitation integrated afterburner also includes a vibration isolation screen, and the vibration isolation screen is connected to the afterburner machine on the rear half of the casing and on the inside of the afterburner casing.

Compared with the prior art, the present invention has the following advantages:

1. The inner cone of the present invention and the casing together form a channel for air flow. Concavity on the rear side of the inner cone to create a small recirculation zone. There are plasma igniters on both sides of the cavity, and the plasma excitation generated by the discharge of the plasma igniter can directly act on the combustion process of the fuel/air mixture in the cavity, and the plasma rich in active particles is used to accelerate the ignition and combustion The process improves the stability of combustion.

2. The large and small recirculation zone design adopted in the present invention not only reduces the total pressure loss and improves the thrust-to-mass ratio of the aircraft, but also improves the durability and service life of the afterburner material; taking into account the combustion stability of the internal and external duct gases, it also improves structural reliability.

3. The present invention adopts an integrated design, which shortens the length of the engine, reduces the mass of the engine, and reduces the flow loss.

4. The present invention uses a plasma igniter to ignite. When the plasma igniter is working, a discharge plasma is generated between the positive electrode and the negative electrode, which can directly act on the combustion process of the fuel/air mixture in the concave cavity. On the one hand, the plasma Discharge can promote the atomization and cracking of fuel oil. On the other hand, the active particles in the plasma can enhance the combustion chemical reaction rate, expand the stable combustion range, and improve the combustion efficiency.

The invention will be described in further detail below by means of the accompanying drawings and examples.

Description of drawings

The above and other features, advantages and aspects of the various embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and that elements and elements are not necessarily drawn to scale.

Fig. 1 shows a schematic diagram of the external structure of the afterburner in the embodiment of the present invention.

Fig. 2 shows a sectional view of the afterburner in the embodiment of the present invention.

FIG. 3 shows an enlarged view of A in FIG. 2 .

Fig. 4 shows a schematic structural view of the inner cone of the present invention.

Fig. 5 shows a schematic diagram of the three-dimensional structure of the support plate of the present invention.

Explanation of reference signs:

11—afterburner receiver; 12—inner channel receiver; 13—outer channel;

20—radial flame stabilizer; 30—inner cone; 31—inner channel;

32—cavity; 41—positive electrode of plasma igniter;

42—the negative electrode of the plasma igniter; 50—the support plate;

51—hollow cavity; 52—injection nozzle through hole; 53—ventilation hole;

60—oil delivery ring; 61—fuel injection rod; 62—fuel injection nozzle;

70—vibration isolation screen.

Detailed ways

Embodiments of the invention will herein be described in more detail with reference to the accompanying drawings. Although certain embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; A more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for exemplary purposes only, and are not intended to limit the protection scope of the present invention.

Please refer to FIG. 1 , which shows an exemplary system architecture diagram to which the embodiment of the present invention can be applied.

As shown in FIG. 2 and FIG. 4 , the present invention discloses a cavity plasma excitation integrated afterburner, which includes a casing, a radial flame stabilizer 20 , an inner cone 30 and a plasma igniter 40 .

The casing includes an afterburner casing 11 and an inner duct casing 12. The afterburner casing 11 is used to separate the outside world from the inside of the engine, and the inner tunnel casing 12 is arranged in the afterburner Inside the combustor casing 11, the annular channel enclosed between the afterburner casing 11 and the inner duct casing 12 is the outer duct 13; the radial flame stabilizer 20 runs through the entire outer duct 13 And the outermost side of the radial flame stabilizer 20 is connected with the afterburner casing 11; the inner cone 30 is arranged inside the inner casing 12, and the inner cone 30 and the inner casing The annular channel surrounded by 12 is an internal channel 31, the inner side of the radial flame stabilizer 20 is connected with the inner cone 30, and the end of the inner cone 30 close to the exhaust flame of the engine is provided with a concave cavity 32, and the plasma The bulk igniter 40 is located at the root of the radial flame holder 20 close to the cavity 32 of the inner cone 30 .

In this embodiment, the inner cone 30 and the casing jointly form a passage for the air flow. A concave cavity 32 is provided on the rear side of the inner cone 30 , that is, on the side close to the tail flame, for creating a small recirculation zone. Plasma igniters 40 are arranged on both sides of the concave cavity 32. The plasma igniters 40 can directly act on the combustion process of the fuel/air mixture in the concave cavity 32, and use the plasma rich in active particles to accelerate the ignition and combustion process. Improved combustion stability.

As shown in Figures 2 and 4, the positive electrode 41 of the plasma igniter is located at the side of the cavity 32 close to the root of the radial flame stabilizer 20, and the negative electrode 42 of the plasma igniter is located at the side of the concave cavity 32 away from the radial flame stabilizer. One side of the root of the device 20.

In this embodiment, when the plasma igniter works, a discharge plasma is generated between the positive electrode and the negative electrode, which can directly act on the combustion process of the fuel/air mixture in the cavity 32. On the one hand, the plasma discharge can promote the combustion of the fuel oil. Atomization cracking, on the other hand, the active particles in the plasma can enhance the combustion chemical reaction rate, expand the stable combustion range, and improve the combustion efficiency.

As shown in FIG. 2 , the concave cavity plasma excitation integrated afterburner further includes a support plate 50 , the support plate 50 is arranged on the outside of the inner cone 30 and connected to the front side of the radial flame stabilizer 20 connected.

As shown in Figures 1 to 4, the concave cavity plasma excitation integrated afterburner also includes an oil transfer ring 60, an oil injection rod 61 and an oil injection nozzle 62, and the oil transfer ring 60 is arranged in the afterburner One end of the fuel injection rod 61 communicates with the oil delivery ring 60 outside the afterburner casing 11 ; the fuel injection nozzle 62 communicates with the fuel injection rod 61 . Wherein, the radial flame stabilizer 20 is provided with a hollow cavity 51, and the other end of the fuel injection rod 61 extends into the inner cone 30 after passing through the hollow cavity 51 of the radial flame stabilizer 20 , the rear part and the rear end surface of the two sides of the radial flame stabilizer 20 are provided with a fuel injection nozzle through hole 52 communicating with the hollow cavity 51, and the fuel injection nozzle 62 is arranged on the fuel injection nozzle. The nozzle through hole 52 communicates with the fuel injection rod 61 in the hollow cavity 51 .

In this embodiment, a concave cavity 32 is provided at the end of the inner cone 30 close to the tail flame, and the support plate 50 is installed in the air flow channel between the inner cone 30 and the inner channel casing 12 . The radial flame stabilizer 20 and the inner cone adopt an integrated design, and the fuel injection rod 61 is placed inside the radial flame stabilizer 20; the radial flame stabilizer 20 is integrated around the inner cone 30; the igniter is located in the radial The root of the flame stabilizer 20 is close to the concave cavity 32 of the inner cone 30; the outlet of the outer duct 13 is located behind the radial flame stabilizer 20, and the air flow flows out from the inner and outer culvert 31 to the radial flame stabilizer 20 and mixes; some nozzles are located in the radial In the small hole that is set on the flame stabilizer 20; The airflow coming from the outer confinement is divided into two parts in the radial flame holder 20, a small part flows into the inside of the branch radial flame holder, and then flows out from the rear end of the radial flame holder 20 to mix with the inner gas; the other part The outflow from the rear of the radial flame stabilizer 20 is mixed with the internal airflow; the two parts of the airflow form a large recirculation zone at the rear of the radial flame stabilizer 20, thereby stabilizing the flame, prolonging the residence time of the flame and making the combustion more complete. There is also a small recirculation area on the inner cone, where the gas flows through here and stays for a longer time, thus forming a duty flame, which is conducive to igniting the gas in other parts, improving the ignition efficiency, stabilizing the flame, and promoting the combustion of the gas. Burn fully.

In this embodiment, the air flow passes through the inner and outer ducts to form a large recirculation zone on the rear side of the support plate and the radial flame stabilizer 20, which improves the stability of combustion. At the same time, the flame is stabilized by radial flame holders.

As shown in Fig. 3 and Fig. 5, there are vent holes 53 on the radial flame stabilizer 20, and the vent holes 53 are located on the two side faces and the rear end face of the radial flame stabilizer 20, and the vent holes 53 are The air holes 53 are located on the front side and the rear side of the corresponding through holes 52 of the fuel injector.

In this embodiment, the fuel injection rod 61 is inserted into the middle of the support plate 50, and the fuel is sprayed from the fuel injection nozzle 62 in the fuel injection nozzle through hole 52 on the side of the support plate 50, and is sprayed on the radial flame stabilizer 20 correspondingly. Vent holes 53 are opened at the front and rear positions of the nozzle through holes 52, and the air jets ejected from the vent holes 53 can improve the penetration of the fuel jet and the distribution of fuel mass fraction. The fuel injection rod 61 is closely matched with the support plate 50 and the radial flame holder 20, so that the fuel oil can be atomized on the surface of the support plate 50 and the radial flame holder 20 to form an oil film, and the oil film can be formed at the rear of the radial flame holder 20 and Secondary atomization at the front of the cavity improves fuel utilization.

In this embodiment, the support plate is arranged integrally around the cone, and the support plate-cavity adopts an integrated design, which overcomes the large weight and volume of the existing afterburner, large flow loss, and large resistance, and improves the stability of flame combustion. issues such as sex.

As shown in FIG. 2 , the concave cavity plasma excitation integrated afterburner further includes a vibration isolation screen 70 , and the vibration isolation screen 70 is connected to the second half of the casing.

On the basis of changing the original general combustion chamber, the present invention adopts an integrated design to reduce the weight and volume, and the support plate-cavity integrated design reduces flow loss and resistance. The fuel injection rod is closely matched with the radial flame stabilizer, which can atomize the fuel to form an oil film on the surface of the support plate, and secondary atomize at the rear of the radial flame stabilizer and the front of the concave cavity to improve fuel utilization. The concavity of the inner cone utilizes the cross-flame effect of the low-velocity return flow in the concavity, and at the same time uses the radial flame stabilizer to stabilize the flame.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. Any simple modifications, changes and equivalent structural transformations made to the above embodiments according to the technical essence of the present invention still belong to the technology of the present invention. within the scope of protection of the scheme.

Claims (7)

1. A re-entrant plasma excitation integrated afterburner, comprising:

the engine comprises a casing and a combustion chamber casing, wherein the casing comprises an afterburner casing (11) and an inner channel casing (12), the afterburner casing (11) is used for separating the outside from the inside of an engine, the inner channel casing (12) is arranged in the afterburner casing (11), and an annular channel enclosed between the afterburner casing (11) and the inner channel casing (12) is an outer channel (13);

a radial flame stabilizer (20), the radial flame stabilizer (20) extending through the entire outer duct (13) and the outermost side of the radial flame stabilizer (20) being connected with the afterburner casing (11);

the inner cone (30), the inner cone (30) is arranged in the inner duct casing (12), an annular channel enclosed by the inner cone (30) and the inner duct casing (12) is an inner duct (31), the inner side of the radial flame stabilizer (20) is connected with the inner cone (30), and a concave cavity (32) is formed in one end, close to engine tail flame, of the inner cone (30);

a plasma igniter (40), the plasma igniter (40) being located at the root of the radial flame stabilizer (20) near the cavity (32) of the inner cone (30).

2. A re-entrant plasma excitation integrated afterburner as claimed in claim 1, wherein: the plasma igniter (40) comprises a plasma igniter positive electrode (41) and a plasma igniter negative electrode (42), the plasma igniter positive electrode (41) is located on one side of the concave cavity (32) close to the root of the radial flame stabilizer (20), and the plasma igniter negative electrode (42) is located on one side of the concave cavity (32) far away from the root of the radial flame stabilizer (20).

3. A re-entrant plasma excitation integrated afterburner as claimed in claim 2, wherein: the cavity plasma excitation integrated afterburner further comprises a support plate (50), wherein the support plate (50) is arranged on the outer side of the inner cone (30) and is connected with the front side of the radial flame stabilizer (20).

4. A re-entrant plasma excitation integrated afterburner as claimed in claim 3, wherein: the cavity plasma excitation integrated afterburner further comprises:

an oil delivery ring (60), wherein the oil delivery ring (60) is arranged on the outer side of the afterburner casing (11);

the oil injection rod (61), one end of the oil injection rod (61) is communicated with an oil delivery ring (60) at the outer side of the afterburner casing (11);

-an oil jet (62), said oil jet (62) being in communication with said oil jet rod (61);

the radial flame stabilizer (20) is provided with a hollow cavity (51), the other end of the oil injection rod (61) penetrates through the hollow cavity (51) of the radial flame stabilizer (20) and then stretches into the inner cone (30), the rear parts and the rear end faces of the two side faces of the radial flame stabilizer (20) are provided with oil injection nozzle through holes (52) communicated with the hollow cavity (51), and the oil injection nozzle (62) is arranged in the oil injection nozzle through holes (52) and is communicated with the oil injection rod (61) in the hollow cavity (51).

5. A re-entrant plasma excitation integrated afterburner as claimed in claim 4, wherein: the radial flame stabilizer (20) is also provided with vent holes (53), the vent holes (53) are positioned on two side surfaces and the rear end surface of the radial flame stabilizer (20), and the vent holes (53) are positioned on the front side and the rear side of the corresponding oil nozzle through hole (52).

6. A re-entrant plasma excitation integrated afterburner as claimed in claim 1, wherein: the support plates are integrally arranged around the cone body, and the support plates and the concave cavities are integrally designed.

7. A re-entrant plasma excitation integrated afterburner as claimed in claim 5, wherein: the recessed cavity plasma excitation integrated afterburner further comprises a vibration isolation screen (70), and the vibration isolation screen (70) is connected to the rear half section of the afterburner casing (11).