A strut plate plasma excited integrated afterburner

Abstract

The application discloses a strut plate plasma excitation integrated afterburner, which comprises a strut plate and a radial flame stabilizer, wherein the rear 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 located at the rear end of a first end face of the radial flame stabilizer, the first end face is a plane parallel to the airflow direction in the duct of the radial flame stabilizer; and the plasma exciter negative electrode is located at the rear end of a second end face of the radial flame stabilizer, the second end face is a plane opposite to the first end face of the radial flame stabilizer. When the afterburner organizes combustion, the plasma rich in active particles is generated through the discharge of the plasma exciter, and participates in the ignition and combustion process of the fuel / air mixture, so that stable and rapid ignition and sustained combustion of the afterburner are realized, and the ignition and combustion organization mode of the afterburner is greatly optimized.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine and gas turbine technology, and in particular relates to an integrated afterburner with support plate plasma excitation. Background Technology

[0002] Afterburners have always been an important component of fighter jets. Under certain circumstances, they can inject fuel back into the exhaust gas flowing out of the turbine for combustion, thereby increasing engine thrust in a short period of time and giving the aircraft a speed advantage.

[0003] Currently, there are three main ignition methods for afterburners: hot jet ignition, catalytic ignition, and spark ignition. Hot jet ignition involves a long flame propagation distance and a complex process, especially when passing through multiple turbine stages where it experiences strong disturbances, requiring extensive ignition tests during afterburner commissioning. Catalytic ignition offers a simple, lightweight, and convenient ignition device, but the expensive platinum-rhodium wire is susceptible to contamination and failure, affecting its reliability. Spark ignition has a long ignition delay and poor ignition stability.

[0004] Plasma ignition-assisted combustion technology is a novel ignition and combustion enhancement technology. It features high ignition energy and short delay time, which can significantly increase the chemical reaction rate, improve combustion efficiency, and expand the stable combustion range. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated afterburner with a support plate and plasma excitation, which realizes stable and rapid ignition and continuous combustion in the afterburner, and greatly optimizes the ignition and combustion organization of the afterburner.

[0006] To address the aforementioned problems, this invention provides an integrated afterburner with a support plate and plasma excitation, characterized in that it comprises: a support plate and a radial flame stabilizer, wherein the front side of the radial flame stabilizer is connected to the rear side of the support plate, and a plasma exciter is disposed on the rear side of the radial flame stabilizer. The plasma exciter includes a positive plasma exciter electrode and a negative plasma exciter electrode. The positive plasma exciter electrode is located at the rear end of the first end face of the radial flame stabilizer, the first end face being a plane on the radial flame stabilizer parallel to the airflow direction within the duct. The negative plasma exciter electrode is located at the rear end of the second end face of the radial flame stabilizer, the second end face being a plane on the radial flame stabilizer opposite to the first end face.

[0007] The aforementioned integrated afterburner with plasma excitation and support plate is characterized in that it further includes a casing and an inner cone. The casing includes an afterburner casing and an inner duct casing. The afterburner casing separates the external environment from the engine interior. The inner duct casing is disposed inside the afterburner casing, and the annular channel formed between the afterburner casing and the inner duct casing is the outer bypass duct. The inner cone is disposed inside the inner duct casing, and the annular channel formed between the inner cone and the inner duct casing is the inner duct.

[0008] The radial flame stabilizer extends through the entire outer duct and its outermost side is connected to the afterburner casing, while its inner side is connected to the inner cone.

[0009] The above-mentioned integrated plasma-excited afterburner with support plate is characterized in that the integrated plasma-excited afterburner with support plate further includes an oil supply ring, an injection rod, and an injection nozzle; the oil supply ring is disposed on the outside of the afterburner casing; one end of the injection rod is connected to the oil supply ring on the outside of the afterburner casing; and the injection nozzle is connected to the injection rod.

[0010] The radial flame stabilizer is provided with a hollow cavity. The other end of the fuel injector rod passes through the hollow cavity of the radial flame stabilizer and extends into the inner cone. The rear and rear end faces of both sides of the radial flame stabilizer are provided with fuel injector through holes that communicate with the hollow cavity. The fuel injector is disposed in the fuel injector through hole and communicates with the fuel injector rod in the hollow cavity.

[0011] The aforementioned integrated plasma-excited combustion chamber with a support plate is characterized in that the radial flame stabilizer is further provided with vent holes, which are located on the two sides and the rear end face of the radial flame stabilizer, and the vent holes are located on the front and rear sides of the corresponding fuel injector through holes.

[0012] The aforementioned integrated afterburner with plasma excitation and support plate is characterized in that a concave cavity is provided on the end of the inner cone near the engine exhaust flame.

[0013] The above-mentioned integrated plasma-excited combustion chamber with a support plate is characterized in that: the support plate is arranged in an integrated manner around the cone and the support plate-cavity adopts an integrated design.

[0014] The above-described integrated plasma-excited afterburner with support plate is characterized in that: the integrated plasma-excited afterburner with concave cavity further includes a vibration isolation screen connected to the rear half of the afterburner casing.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This invention uses a plasma exciter for ignition. When the plasma exciter is working, it generates discharge plasma between the positive and negative electrodes, which can directly act on the combustion process of the fuel / air mixture in the recirculation zone behind the radial flame stabilizer. On the one hand, the plasma discharge can promote the atomization and cracking of fuel, and 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. This achieves stable and rapid ignition and continuous combustion support in the afterburner, greatly optimizing the ignition method of the afterburner.

[0017] 2. In this invention, the support plate, inner cone, and casing together form a channel for airflow. Along the direction of airflow, a large recirculation zone is generated after the radial flame stabilizer; the cavity on the rear side of the inner cone is used to generate a small recirculation zone.

[0018] 3. The large and small recirculation zone design adopted in this 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; it also takes into account the combustion stability of the internal and external bypass gases and improves the structural reliability.

[0019] 4. The present invention adopts an integrated design, which shortens the length of the engine, reduces the weight of the engine, and reduces flow losses.

[0020] The invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. 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 the originals and elements are not necessarily drawn to scale.

[0022] Figure 1 A schematic diagram of the connection relationship between the support plate and the radial flame stabilizer in an embodiment of the present invention is shown.

[0023] Figure 2 A three-dimensional structural schematic diagram of the radial flame stabilizer in an embodiment of the present invention is shown.

[0024] Figure 3 A schematic diagram of the cross-sectional structure of the radial flame stabilizer in an embodiment of the present invention is shown.

[0025] Figure 4 A schematic diagram of the cross-sectional structure of the support plate in an embodiment of the present invention is shown.

[0026] Figure 5A cross-sectional view of the afterburner chamber in an embodiment of the present invention is shown.

[0027] Figure 6 It shows Figure 5 A magnified view of A.

[0028] Figure 7 A schematic diagram of the structure of the inner cone of the present invention is shown.

[0029] Figure 8 A schematic diagram of the external structure of the afterburner in an embodiment of the present invention is shown.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10—Support plate; 20—Radial flame stabilizer; 21—Hollow cavity;

[0032] 22—Injector through hole; 23—Positive electrode of plasma actuator; 24—Negative electrode of plasma actuator;

[0033] 25—Ventilation port; 31—Afterburner casing; 32—Inner duct casing;

[0034] 33—Outer channel; 34—Inner channel; 40—Inner cone;

[0035] 41—Cavity; 50—Fuel supply ring; 51—Fuel injector rod;

[0036] 52—Fuel injector; 60—Vibration isolation screen. Detailed Implementation

[0037] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0038] like Figures 1 to 4 As shown, this invention discloses an integrated plasma-excited afterburner with a support plate, comprising a support plate 10 and a radial flame stabilizer 20. The front side of the radial flame stabilizer 20 is connected to the rear side of the support plate 10. A plasma exciter is disposed on the rear side of the radial flame stabilizer 20. The positive electrode 23 of the plasma exciter is located at the rear end of the first end face of the radial flame stabilizer 20. The first end face is a plane on the radial flame stabilizer 20 parallel to the airflow direction in the duct. The negative electrode 24 of the plasma exciter is located at the rear end of the second end face of the radial flame stabilizer 20. The second end face is a plane on the radial flame stabilizer 20 opposite to the first end face.

[0039] In this embodiment, a plasma exciter is provided at the rear end of the radial flame stabilizer 20. An electric arc discharge is generated between the positive electrode 23 and the negative electrode 22 of the plasma exciter, and plasma is generated around it. That is, a large amount of plasma is generated in the recirculation region at the rear end of the radial flame stabilizer 20. The fuel-air mixture is ignited by the electric arc plasma here and a stable flame is formed. This prolongs the flame residence time, thereby making the combustion more complete. It realizes stable and rapid ignition and continuous combustion in the afterburner, and greatly optimizes the ignition method of the afterburner.

[0040] like Figure 4 As shown, the integrated plasma-excited afterburner with support plate also includes a casing and an inner cone 40. The casing includes an afterburner casing 31 and an inner duct casing 32. The afterburner casing 31 is used to isolate the outside from the engine interior. The inner duct casing 32 is located inside the afterburner casing 31. The annular channel formed between the afterburner casing 31 and the inner duct casing 32 is the outer bypass duct 33. The inner cone 40 is located inside the inner duct casing 32. The annular channel formed by the inner cone 40 and the inner duct casing 32 is the inner duct 34. The radial flame stabilizer 20 penetrates the entire outer bypass duct 33, and the outermost side of the radial flame stabilizer 20 is connected to the afterburner casing 31. The inner side of the radial flame stabilizer 20 is connected to the inner cone 40.

[0041] like Figure 5 , Figure 6 and Figure 8 As shown, the integrated plasma-excited afterburner with support plate also includes: an oil supply ring 50, an injection rod 51, and an injection nozzle 52. The oil supply ring 50 is disposed on the outside of the afterburner casing 31. One end of the injection rod 51 is connected to the oil supply ring 50 on the outside of the afterburner casing 31. The injection nozzle 52 is connected to the injection rod 51. The radial flame stabilizer 20 is provided with a hollow cavity 21. The other end of the injection rod 51 passes through the hollow cavity 21 of the radial flame stabilizer 20 and extends into the inner cone 40. The rear and rear end faces of both sides of the radial flame stabilizer 20 are provided with injection nozzle through holes 22 that communicate with the hollow cavity 21. The injection nozzle 52 is disposed in the injection nozzle through hole 22 and is connected to the injection rod 51 in the hollow cavity 21.

[0042] In this embodiment, a cavity 41 is provided at the end of the inner cone 40 near the tail flame, and the support plate 10 and radial flame stabilizer 20 are installed in the airflow channel between the inner cone 40 and the inner duct casing 32. The radial flame stabilizer 20 and the inner cone are integrated, and the fuel injector 51 is placed inside the radial flame stabilizer 20; the radial flame stabilizer 20 is integrated around the inner cone 40; the outlet of the outer duct 33 is located behind the radial flame stabilizer 20, and the airflow flows out from the inner duct 34 and mixes with the radial flame stabilizer 20; some nozzles are located in the small holes provided on the radial flame stabilizer 20; fuel is sprayed out from the nozzles in the small holes on the side of the radial flame stabilizer 20; a plasma exciter electrode is provided on the end face of the radial flame stabilizer 20 for ignition. The airflow from the outer duct is divided into two parts in the radial flame stabilizer 20. A small part flows into the interior of the radial flame stabilizer and then flows out from the rear end of the radial flame stabilizer 20 to mix with the internal combustion gas. The other part flows out from the rear of the radial flame stabilizer 20 and mixes with the internal airflow. The two parts of the airflow form a large recirculation zone at the rear of the radial flame stabilizer 20, which stabilizes the flame and prolongs the flame residence time, thereby making the combustion more complete.

[0043] like Figure 2 and Figure 6 As shown, the radial flame stabilizer 20 also has a vent hole 25, which is located on the two sides and the rear end face of the radial flame stabilizer 20, and the vent hole 25 is located on the front and rear sides of the corresponding fuel injector through hole 22.

[0044] In this embodiment, the fuel injector 51 is inserted into the middle of the support plate 10. Fuel is injected from the fuel injector 52 inside the fuel injector through-hole 22 on the side of the support plate 10. Vent holes 25 are opened on the support plate 10 at positions corresponding to the front and rear of the fuel injector through-hole 22. The air jet ejected from the vent holes 25 improves the penetration of the fuel jet and the fuel mass fraction distribution. The close matching between the fuel injector 51 and the support plate 10 enables the fuel to be atomized on the surface of the support plate 10 to form an oil film, and to be atomized again at the tail of the support plate and the front of the cavity, thereby improving fuel utilization.

[0045] like Figure 5 and Figure 7 As shown, a cavity 41 is provided at the end of the inner cone 40 near the engine exhaust flame.

[0046] In this embodiment, the inner cone 40 and the casing together form a channel for airflow. A cavity 41 is provided on the rear side of the inner cone 40, near the tail flame, to create a small recirculation zone. The gas flows through this zone and remains there for a longer time, thus forming a standby flame. This is beneficial for igniting gas in other parts, improving ignition efficiency, stabilizing the flame, and promoting complete combustion. The airflow, through the inner and outer ducts, forms a large recirculation zone behind the support plate and radial flame stabilizer 20, improving combustion stability. The electrodes of the plasma exciter located at the rear end of the radial flame stabilizer 20 ignite the fuel-air mixture in the large recirculation zone. The inner cone cavity utilizes the low-speed recirculation at the cavity to create a combined flame effect, stabilizing the flame with the internal hollow tail support plate distributed within the diffuser.

[0047] In this embodiment, when the plasma exciter is working, it generates discharge plasma between the positive and negative electrodes, which can directly act on the combustion process of the fuel / air mixture in the recirculation zone behind the radial flame stabilizer 20. On the one hand, plasma discharge can promote the atomization and cracking of fuel, and on the other hand, active particles in the plasma can enhance the combustion chemical reaction rate, expand the stable combustion range, and improve combustion efficiency.

[0048] like Figure 5 As shown, the support plate is arranged in an integrated manner around the cone and the support plate-cavity adopts an integrated design, which overcomes the problems of large weight and volume, large flow loss, large resistance, and poor flame combustion stability of existing afterburners.

[0049] like Figure 5 As shown, the integrated plasma-excited afterburner with support plate also includes a vibration isolation screen 60, which is connected to the rear half of the afterburner casing 31.

[0050] This invention, based on the conventional afterburner design, adopts an integrated design to reduce weight and volume, and an integrated support plate-cavity design to reduce flow losses and resistance. The close matching of the fuel injector and the radial flame stabilizer enables fuel to atomize on the support plate surface to form a fuel film, and further atomize at the tail of the radial flame stabilizer and the front of the cavity, improving fuel utilization. The inner conical cavity utilizes the flame-binding effect of the low-speed backflow at the cavity, while simultaneously using the radial flame stabilizer to stabilize the flame.

[0051] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A plate-supported plasma-excited integrated afterburner, characterized in that, include: The support plate (10) and the radial flame stabilizer (20) are connected at the front and rear of the support plate (10). A plasma actuator is provided at the rear of the radial flame stabilizer (20). The plasma actuator includes a positive electrode (23) and a negative electrode (24). The positive electrode (23) is located at the rear end of the first end face of the radial flame stabilizer (20). The first end face is a plane on the radial flame stabilizer (20) that is parallel to the airflow direction in the duct. The negative electrode (24) is located at the rear end of the second end face of the radial flame stabilizer (20). The second end face is a plane on the radial flame stabilizer (20) that is opposite to the first end face. The integrated plasma-excited afterburner with support plate also includes: The casing includes an afterburner casing (31) and an inner bypass casing (32). The afterburner casing (31) is used to separate the outside from the inside of the engine. The inner bypass casing (32) is located inside the afterburner casing (31). The annular channel formed between the afterburner casing (31) and the inner bypass casing (32) is called the outer bypass duct (33). An inner cone (40) is disposed inside the inner channel casing (32), and the annular channel formed by the inner cone (40) and the inner channel casing (32) is the inner channel (34); The radial flame stabilizer (20) runs through the entire outer duct (33) and the outermost side of the radial flame stabilizer (20) is connected to the afterburner casing (31), while the inner side of the radial flame stabilizer (20) is connected to the inner cone (40). An oil supply ring (50) is disposed on the outside of the afterburner casing (31); The fuel injector (51) has one end connected to the fuel supply ring (50) on the outside of the afterburner casing (31); The fuel injector (52) is connected to the fuel injector rod (51); The radial flame stabilizer (20) is provided with a hollow cavity (21). The other end of the fuel injector (51) passes through the hollow cavity (21) of the radial flame stabilizer (20) and extends into the inner cone (40). The rear part and the rear end face of both sides of the radial flame stabilizer (20) are provided with fuel injector through holes (22) that communicate with the hollow cavity (21). The fuel injector (52) is provided in the fuel injector through hole (22) and communicates with the fuel injector (51) in the hollow cavity (21). The radial flame stabilizer (20) is also provided with a vent (25), which is located on the two sides and the rear end face of the radial flame stabilizer (20), and the vent (25) is located on the front and rear sides of the corresponding fuel injector through hole (22). The inner cone (40) has a cavity (41) at one end near the engine exhaust flame; The support plate is arranged in an integrated manner around the cone, and the support plate and the concave cavity are designed as an integrated unit. The integrated plasma-excited afterburner with support plate also includes a vibration isolation screen (60), which is connected to the rear half of the afterburner casing (31).

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