CN116697402A - A strut-plate plasma excitation integrated afterburner - Google Patents

Abstract

The invention discloses a support plate plasma excitation integrated afterburner, which comprises: the back side of the radial flame stabilizer is provided with a plasma exciter, the plasma exciter comprises a plasma exciter positive electrode and a plasma exciter negative electrode, the plasma exciter positive electrode is positioned at the back end of a first end face of the radial flame stabilizer, the first end face is a plane parallel to the direction of air flow in the duct on the radial flame stabilizer, the plasma exciter negative electrode is positioned at the back end of a second end face of the radial flame stabilizer, and the second end face is a plane opposite to the first end face on the radial flame stabilizer. When the afterburner is used for tissue combustion, plasma rich in active particles is generated through discharge of a plasma exciter, and the plasma is involved in the ignition and combustion process of fuel/air mixture, so that stable and rapid ignition and continuous combustion supporting of the afterburner are realized, and the ignition and combustion tissue mode of the afterburner is greatly optimized.

Description

A strut-plate plasma excitation integrated afterburner

technical field

The invention belongs to the technical field of aero-engines and gas turbines, in particular to an afterburner integrated with support plate plasma excitation.

Background technique

The afterburner has always been an important part of fighter jets. Under certain circumstances, it can inject fuel into the gas flowing out of the turbine for combustion again, so as to increase the thrust of the engine in a short time and give the aircraft a speed advantage.

At present, there are three main ignition modes of the afterburner: hot jet ignition, catalyst ignition and spark ignition. For hot jet ignition, the flame travels a long distance and the process is complicated, especially when it passes through the multi-stage turbine, it is strongly disturbed, and a large number of ignition tests should be done when debugging the afterburner; catalyst ignition, the ignition device structure is simple, It is light in weight and easy to ignite, but the platinum-rhodium wire is expensive, and it is easily polluted and fails, which affects its working reliability; electric spark ignition has a long ignition delay time and poor ignition stability.

Plasma ignition and combustion-supporting technology is a new type of ignition and combustion enhancement technology, with high ignition energy and short delay time, which can significantly increase the chemical reaction rate, improve combustion efficiency, and expand the stable combustion range.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and provide a support plate plasma excitation integrated afterburner, which realizes stable and rapid ignition and continuous combustion of the afterburner, and greatly optimizes the afterburner Combustion chamber ignition and combustion organization.

In order to solve the above problems, the present invention provides a strut plate plasma excitation integrated afterburner, which is characterized in that it comprises: a strut plate and a radial flame stabilizer, the front side of the radial flame stabilizer is in contact with the strut plate The rear side of the plate is connected, the rear side of the radial flame stabilizer is provided with a plasma exciter, and the plasma exciter includes a positive pole of the plasma exciter and a negative pole of the plasma excitation, and the positive pole of the plasma exciter is located in the radial direction To the rear end of the first end face of the flame stabilizer, the first end face is a plane parallel to the airflow direction in the duct on the radial flame stabilizer, and the negative electrode of the plasma actuator is located at the rear of the second end face of the radial flame stabilizer end, and the second end face is a plane opposite to the first end face on the radial flame stabilizer.

The aforementioned strut plate plasma excitation integrated afterburner is characterized in that the strut plate plasma excitation integrated afterburner also includes a casing and an inner cone, and the casing includes an afterburner Chamber casing and internal channel casing, the afterburner casing is used to separate the outside world from the inside of the engine, the internal channel casing is arranged inside the afterburner casing, and the afterburner The annular passage surrounded between the inner chamber casing and the inner passage casing is an outer passage; the inner cone is arranged inside the inner passage casing, and the annular passage surrounded by the inner cone and the inner passage casing is Inner way;

Wherein, the radial flame stabilizer runs through the entire outer duct, and the outermost side of the radial flame stabilizer is connected with the afterburner casing, and the inner side of the radial flame stabilizer is connected with the inner cone.

The above-mentioned support plate plasma excitation integrated afterburner is characterized in that the support plate plasma excitation integrated afterburner also includes an oil delivery ring, a fuel 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 a nozzle through hole communicating with the hollow cavity, and the fuel nozzle is arranged in the through hole of the fuel nozzle and connected to the hollow cavity The fuel injection rods in the body are connected.

The above-mentioned support plate 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 air holes are located on the front side and rear side of the corresponding through holes of the fuel injector.

The above-mentioned support plate plasma excitation integrated afterburner is characterized in that, the end of the inner cone close to the exhaust flame of the engine is provided with a concave cavity.

The above-mentioned support plate 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 aforementioned support plate 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 on the second half of the chamber receiver.

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

1. The present invention uses a plasma actuator to ignite. When the plasma actuator 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 at the backflow area behind the radial flame stabilizer Among them, on the one hand, plasma discharge can promote the atomization and cracking of fuel oil; on the other hand, the active particles in plasma can enhance the chemical reaction rate of combustion, expand the stable combustion range, improve combustion efficiency, and realize the stable and rapid ignition of the afterburner and the continuous Combustion, which greatly optimizes the ignition mode of the afterburner.

2. In the present invention, the support plate, the inner cone and the casing together form a passage for the air flow. Along the direction of air flow, a large recirculation zone is created behind the radial flame holder; the concave cavity on the rear side of the inner cone is used to create a small recirculation zone.

3. The large and small recirculation zone design adopted by 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.

4. 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.

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 structural diagram of the connection relationship between the support plate and the radial flame stabilizer in the embodiment of the present invention.

Fig. 2 shows a schematic diagram of the three-dimensional structure of the radial flame stabilizer in the embodiment of the present invention.

Fig. 3 shows a schematic diagram of a cross-sectional structure of a radial flame stabilizer in an embodiment of the present invention.

Fig. 4 shows a schematic diagram of the cross-sectional structure of the support plate in the embodiment of the present invention.

Fig. 5 shows a sectional view of the afterburner in the embodiment of the present invention.

FIG. 6 shows an enlarged view of A in FIG. 5 .

Fig. 7 shows a schematic structural view of the inner cone of the present invention.

Fig. 8 shows a schematic diagram of the external structure of the afterburner in the embodiment of the present invention.

Explanation of reference signs:

10—branch plate; 20—radial flame holder; 21—hollow cavity;

22—the through hole of the injector; 23—the positive pole of the plasma actuator; 24—the negative pole of the plasma actuator;

25—ventilation hole; 31—afterburner receiver; 32—inner channel receiver;

33—outer channel; 34—inner channel; 40—inner cone;

41—concave; 50—oil transfer ring; 51—injection rod;

52—fuel injector; 60—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.

As shown in Figures 1 to 4, the present invention discloses a strut plate plasma excitation integrated afterburner, which includes a strut plate 10 and a radial flame stabilizer 20, the front side of the radial flame stabilizer 20 Connected to the rear side of the support plate 10, the rear side of the radial flame stabilizer 20 is provided with a plasma exciter, and the positive electrode 23 of the plasma exciter is located at the rear end of the first end surface of the radial flame stabilizer 20, The first end face is a plane parallel to the airflow direction in the duct on the radial flame stabilizer 20, and the plasma actuator negative electrode 24 is located at the rear end of the second end face of the radial flame stabilizer 20, and the second end face is A plane opposite to the first end face on the radial flame holder 20 .

In this embodiment, a plasma exciter is arranged at the rear end of the radial flame stabilizer 20, and an arc discharge is generated between the positive pole 23 and the negative pole 22 of the plasma exciter and plasma is generated around it, that is, in the radial flame stabilizer A large amount of plasma is generated in the recirculation area at the rear end of the burner 20, where the fuel-air mixture is ignited by the arc plasma to form a stable flame, which prolongs the residence time of the flame and makes the combustion more complete, realizing the stable and rapid afterburner The ignition and continuous combustion support greatly optimize the ignition mode of the afterburner.

As shown in Figure 4, the support plate plasma excitation integrated afterburner also includes a casing and an inner cone 40, and the casing includes an afterburner casing 31 and an inner tunnel casing 32, the The afterburner casing 31 is used to separate the outside world from the inside of the engine. The inner tunnel casing 32 is arranged inside the afterburner casing 31. The afterburner casing 31 and the inner tunnel engine The annular channel surrounded by the box 32 is the outer channel 33; the inner cone 40 is arranged inside the inner channel casing 32, and the annular channel surrounded by the inner cone 40 and the inner channel casing 32 is the inner channel. Road 34; wherein, the radial flame holder 20 runs through the entire outer duct 33 and the outermost side of the radial flame holder 20 is connected with the afterburner casing 31, and the radial flame holder 20 The inner side of the inner cone is connected with the inner cone 40.

As shown in Fig. 5, Fig. 6 and Fig. 8, the support plate plasma excitation integrated afterburner also includes: oil transfer ring 50, fuel injection rod 51 and fuel injection nozzle 52, and the oil transfer ring 50 is set On the outside of the afterburner casing 31; one end of the fuel injection rod 51 communicates with the oil transfer ring 50 outside the afterburner casing 31; the fuel injection nozzle 52 is connected with the fuel injection rod 51 wherein, the radial flame stabilizer 20 is provided with a hollow cavity 21, and the other end of the fuel injection rod 51 extends into the inner cone after passing through the hollow cavity 21 of the radial flame stabilizer 20 40, the rear part and the rear end surface of the two sides of the radial flame stabilizer 20 are provided with an oil nozzle through hole 22 communicating with the hollow cavity 21, and the oil injection nozzle 52 is arranged on the The through hole 22 of the fuel injection nozzle communicates with the fuel injection rod 51 in the hollow cavity 21 .

In this embodiment, a concave cavity 41 is provided at the end of the inner cone 40 close to the tail flame, and the support plate 10 and the radial flame stabilizer 20 are installed in the airflow channel between the inner cone 40 and the inner channel casing 32 . The radial flame stabilizer 20 and the inner cone adopt an integrated design, and the fuel injection rod 51 is placed inside the radial flame stabilizer 20; the radial flame stabilizer 20 is arranged around the inner cone 40 in an integrated manner; the outer duct 33 The outlet is located behind the radial flame stabilizer 20, and the airflow flows out from the inner channel 34 to the radial flame stabilizer 20 and then mixes; some nozzles are located in the small holes set on the radial flame stabilizer 20; the fuel oil flows from the radial flame stabilizer 20 The nozzle in the small hole on the side sprays out; the end face of the radial flame stabilizer 20 is provided with a plasma exciter electrode for ignition. 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.

As shown in Figures 2 and 6, the radial flame holder 20 is also provided with vent holes 25, the vent holes 25 are located on the two side faces and the rear end face of the radial flame holder 20, and the vent holes The air holes 25 are located on the front side and the rear side of the corresponding through holes 22 of the fuel injector.

In this embodiment, the fuel injection rod 51 is inserted into the middle of the support plate 10, and the fuel is sprayed from the fuel injection nozzle 52 in the fuel injection nozzle through hole 22 on the side of the support plate 10, and the fuel injection nozzle on the support plate 10 is connected to the through hole. Vent holes 25 are opened at the front and rear positions of the holes 22, and the air jets ejected from the vent holes 25 can improve the penetration of the fuel jet and the distribution of the mass fraction of the fuel. The fuel injection rod 51 is closely matched with the support plate 10, so that fuel can be atomized on the surface of the support plate 10 to form an oil film, and secondary atomized at the rear of the support plate and the front of the cavity, improving fuel utilization.

As shown in FIG. 5 and FIG. 7 , a concave cavity 41 is provided at the end of the inner cone 40 close to the exhaust flame of the engine.

In this embodiment, the inner cone 40 and the casing together form a passage for the air flow. The rear side of the inner cone 40, that is, the side close to the tail flame, is provided with a concave cavity 41, which is used to generate a small recirculation zone, where the gas flows through and stays for a longer time, thereby forming a duty flame, which is beneficial to igniting other parts The gas can improve the ignition efficiency, stabilize the flame and promote the full combustion of the gas. The air flow forms a large recirculation zone on the rear side of the support plate and the radial flame stabilizer 20 through the inner and outer ducts, which improves the stability of combustion. The electrodes of the plasma actuator installed at the rear end of the radial flame stabilizer 20 ignite the fuel-air mixture in the large recirculation area, and the inner cone cavity utilizes the low-speed reflow at the cavity to form a cross-flame effect, so that the gas distributed in the diffuser The internal hollow truncated strut inside stabilizes the flame.

In this embodiment, when the plasma actuator 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 recirculation area behind the radial flame stabilizer 20. On the one hand, the plasma Bulk 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 combustion efficiency.

As shown in Figure 5, the support plate is integrally arranged 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, large resistance, and improved flame combustion. stability issues.

As shown in FIG. 5 , the strut plate plasma excitation integrated afterburner further includes a vibration isolation screen 60 , and the vibration isolation screen 60 is connected to the second half of the afterburner casing 31 .

On the basis of changing the original general afterburner, the present invention adopts an integrated design to reduce 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 on the surface of the support plate to form an oil film, and secondary atomize at the rear of the radial flame stabilizer of the support plate 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 strut plate plasma excitation integrated afterburner, characterized in that it comprises: a strut plate (10) and a radial flame stabilizer (20), the front side of the radial flame stabilizer (20) Connected to the rear side of the support plate (10), the rear side of the radial flame stabilizer (20) is provided with a plasma exciter, and the plasma exciter includes a positive electrode (23) of the plasma exciter and a plasma exciter Exciter negative pole (24), described plasma exciter positive pole (23) is positioned at the rear end of radial flame stabilizer (20) first end surface, and described first end surface is radial flame stabilizer (20) and culvert A plane parallel to the gas flow direction in the channel, the plasma actuator negative electrode (24) is positioned at the rear end of the second end face of the radial flame stabilizer (20), and the second end face is connected to the radial flame stabilizer (20) A plane opposite the first end face. 2. A strut plate plasma excitation integrated afterburner according to claim 1, characterized in that the strut plate plasma excitation integrated afterburner further comprises: The casing, the casing includes an afterburner casing (31) and an internal channel casing (32), the afterburner casing (31) is used to separate the outside world from the inside of the engine, the The inner channel casing (32) is arranged inside the afterburner casing (31), and the annular channel enclosed between the afterburner casing (31) and the inner channel casing (32) is the outer channel. Road (33); Inner cone (40), the inner cone (40) is arranged in the inside of the inner channel casing (32), and the annular channel surrounded by the inner cone (40) and the inner channel casing (32) is the inner Road (34); Wherein, the radial flame stabilizer (20) runs through the entire outer duct (33) and the outermost side of the radial flame stabilizer (20) is connected with the afterburner casing (31), the radial It is connected with the inner cone (40) to the inside of the flame stabilizer (20). 3. A strut plate plasma excitation integrated afterburner according to claim 2, characterized in that the strut plate plasma excitation integrated afterburner further comprises: An oil transfer ring (50), the oil transfer ring (50) is arranged on the outside of the afterburner casing (31); An oil injection rod (51), one end of the oil injection rod (51) communicates with the oil transfer ring (50) outside the afterburner casing (31); A fuel injection nozzle (52), the fuel injection nozzle (52) is in communication with the fuel injection rod (51); Wherein, the radial flame stabilizer (20) is provided with a hollow cavity (21), and the other end of the spray rod (51) passes through the hollow cavity (20) of the radial flame stabilizer (20). 21) After extending into the inner cone (40), the rear part and the rear end surface of the two sides of the radial flame stabilizer (20) are provided with an oil spray communicating with the hollow cavity (21) A nozzle through hole (22), the fuel injection nozzle (52) is arranged in the fuel injection nozzle through hole (22) and communicates with the fuel injection rod (51) in the hollow cavity (21). 4. A support plate plasma excitation integrated afterburner according to claim 3, characterized in that said radial flame stabilizer (20) is also provided with vent holes (25), said vent holes The air hole (25) is located on the two side surfaces and the rear end surface of the radial flame stabilizer (20), and the air hole (25) is located at the front side and the rear side of the corresponding through hole (22) of the fuel injector superior. 5. A strut plate plasma excitation integrated afterburner according to any one of claims 1 to 4, characterized in that, the end of the inner cone (40) close to the exhaust flame of the engine is provided with a Recess (41). 6 . The support plate plasma excitation integrated afterburner according to claim 5 , wherein the support plate is integrally arranged around the cone, and the support plate and concave cavity adopt an integrated design. 7 . 7. A strut plate plasma excitation integrated afterburner according to claim 6, characterized in that: the strut plate plasma excitation integrated afterburner further includes a vibration isolation screen (60), The vibration isolation screen (60) is connected to the second half of the afterburner casing (31).