A rear ducted ejector and afterburner

Abstract

The application discloses a rear duct ejector and a afterburning chamber, and relates to the technical field of afterburning chamber.The rear duct ejector comprises a guide plate, which is arranged between an inner-outer duct partition plate and an inner cone along the axial direction of the flow channel of the afterburning chamber.A guide cavity is formed in the guide plate, the air inlet of the guide cavity is communicated with a flow guide opening formed in the inner-outer duct partition plate, and a plurality of injection holes are formed in the two side walls of the guide plate and communicated with the guide cavity.The guide cavity is used for spraying the outer duct air into the inner duct and mixing with the inner duct air.An adjusting assembly is arranged in the guide cavity of the guide plate, and the adjusting assembly is used for adjusting the opening area of the injection holes.The outer duct air is introduced into the rear duct ejector, sprayed into the inner duct through the injection holes in the side walls of the guide plate, and forms a high-momentum ratio transverse jet flow, so that the generated complex vortex system is used to accelerate the mixing of the outer duct air and the inner duct air, the mixing efficiency is improved, and on this basis, the adjusting assembly changes the effective opening area of the injection holes, so that the pressure matching under different working conditions is realized.

Description

Technical Field

[0001] This invention relates to the field of afterburner technology, and in particular to a rear duct ejector and an afterburner. Background Technology

[0002] Variable cycle engines, by adjusting the bypass ratio, balance low fuel consumption for subsonic cruise with high thrust for supersonic flight, representing a crucial development direction for future aero-engines. The afterburner mixer is the core component for achieving mixing of the inner and outer bypass airflows. Existing mixers are mainly divided into two categories: annular mixers and lobe mixers. Annular mixers rely on the shearing action of the inner and outer bypass airflows to achieve mixing; they have a simple structure but relatively low mixing efficiency. Lobe mixers enhance mixing by inducing flow vortices through their lobe structure and are currently the mainstream solution for conventional turbofan engines. However, the above mixers are all optimized for operating conditions where the total pressure ratio of the inner and outer bypass airflows is close to 1. When the total pressure ratio increases to 1.2~1.5, their mixing efficiency drops sharply, mixing uniformity decreases drastically, and significant temperature and velocity distortions appear in the downstream flow field, forming numerous local hot spots and high-speed zones. This easily causes erosion of the flame tube and stabilizer, severely affecting fuel atomization and evaporation and flame stability, greatly increasing the difficulty of downstream combustion organization and thermal protection design.

[0003] Therefore, there is an urgent need to design a rear duct ejector and afterburner to solve the technical problem of insufficient mixing efficiency in the existing technology. Summary of the Invention

[0004] This invention provides a rear duct ejector and an afterburner to solve the technical problem of insufficient mixing efficiency in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a rear duct ejector applied to an afterburner flow channel. The afterburner flow channel comprises, from the outside to the inside, an outer cylinder, inner and outer duct baffles, and an inner cone. The inner and outer duct baffles are fitted onto the air inlet end of the outer cylinder, and each baffle has an air outlet. The area between the inner and outer duct baffles and the inner cone is the inner duct, and the area between the inner and outer duct baffles and the outer cylinder is the outer duct. A guide vane is disposed along the axial direction of the afterburner flow channel between the inner and outer duct baffles and the inner cone; The guide plate has a guide cavity inside, and the air inlet of the guide cavity is connected to the flow outlet opened on the inner and outer duct partitions. The two side walls of the guide plate have spray holes that are connected to the guide cavity. The guide cavity is used to inject the outer duct air into the inner duct and mix it with the inner duct air. An adjustment component is provided inside the flow guide cavity of the guide plate, and the adjustment component is used to adjust the opening area of ​​the nozzle.

[0006] Furthermore, the adjustment component includes a sliding base and a slider; the sliding base is provided with a groove, and the slider slides in cooperation with the groove; A through hole extending through the thickness direction of the sliding base is provided on the sliding base within the sliding range of the slider, and the through hole constitutes the spray hole; when the slider slides along the groove, it can change the area of ​​the through hole to adjust the opening area of ​​the spray hole.

[0007] Furthermore, each of the sliding bases is provided with two sliders, the two sliders are located on the same side of the sliding base, and both sliders are slidably engaged with the groove. The two sliders are configured to move relative to each other or in opposite directions along the groove to change the blocking area of ​​the through hole by the two sliders, thereby adjusting the opening area of ​​the spray hole.

[0008] Furthermore, the sliding base and the guide plate are integrally formed.

[0009] Furthermore, the guide plate includes two side plates arranged radially opposite each other along the flow channel of the afterburner, and a flow guide gap is provided between the two side plates, the flow guide gap forming the flow guide cavity.

[0010] Furthermore, the two side plates are fitted together on the side facing the direction of the internal airflow to form the leading edge of the guide plate. The width of the side plates gradually decreases from the outside to the inside along the radial direction of the afterburner flow channel, and the leading edge extends obliquely along the radial direction of the afterburner flow channel so that the leading edge of the guide plate forms a swept-back distribution relative to the afterburner flow channel.

[0011] Furthermore, the spacing of the flow guide gap gradually increases along the axial direction of the afterburner flow channel until the maximum spacing is reached on the side of the flow guide plate where the nozzle is opened, so that the flow guide cavity has a flared structure.

[0012] Furthermore, multiple nozzles are provided, and the multiple nozzles are radially distributed along the flow channel of the afterburner at the trailing edge of the guide plate.

[0013] Furthermore, each of the nozzles is a rectangular hole with its long side extending axially along the flow channel of the afterburner, and the opening area of ​​the nozzle gradually decreases from the outside to the inside along the radial direction of the flow channel of the afterburner.

[0014] An afterburner includes multiple rear duct ejectors, which are evenly arranged along the circumference of the inner cone.

[0015] Compared with the prior art, the technical solution disclosed in this invention has the following beneficial effects: By adopting the above-mentioned scheme, this invention utilizes the high-speed characteristics generated when the bypass gas mixes with the internal gas to assist in mixing. The bypass gas is introduced into the rear bypass ejector and injected into the internal gas through nozzles on the sidewall of the guide vane. Taking advantage of the characteristics of the bypass gas, such as pressure reduction and velocity increase after ejection, a transverse jet with a high momentum ratio is formed. This generates a complex vortex system to accelerate the mixing of the bypass gas and the internal gas, thereby improving the mixing efficiency. In addition, an adjustment component is provided in the guide cavity to adjust the opening area of ​​the nozzle. When the bypass ratio of the variable cycle engine changes continuously, the total pressure ratio of the bypass and internal gases changes dynamically. The adjustment component achieves pressure matching under different operating conditions by changing the effective opening area of ​​the nozzle, ensuring that a reasonable jet momentum ratio can be maintained under each operating condition. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the rear duct ejector and the afterburner flow channel in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the rear duct ejector in an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the rear duct ejector in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the adjustment component in an embodiment of the present invention.

[0018] Among them, 1. Inner cone; 2. Guide plate; 201. Side plate; 202. Spray hole; 203. Sliding base; 204. Sliding block; 3. Inner and outer culvert partitions; 301. Drainage port; 4. Outer cylinder. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides a rear duct ejector and an afterburner to solve the technical problem of insufficient mixing efficiency in the prior art.

[0022] like Figures 1 to 4 As shown in the embodiment of the present invention, a rear duct ejector is disclosed, wherein the rear duct ejector is applied to the flow channel of the afterburner. The flow channel of the afterburner is provided with an outer cylinder 4, inner and outer duct baffles 3, and an inner cone 1 arranged sequentially from the outside to the inside. The inner and outer duct baffles 3 are sleeved on the air inlet end of the outer cylinder 4, and the inner and outer duct baffles 3 are provided with air outlets 301. The area between the inner cone 1 of the inner and outer duct baffles 3 is the inner duct, and the area between the inner and outer duct baffles 3 and the outer cylinder 4 is the outer duct. The rear duct ejector includes... A guide vane 2 is arranged axially between the inner and outer duct baffles 3 and the inner cone 1 along the flow channel of the afterburner. A guide cavity is opened inside the guide vane 2, and the air inlet of the guide cavity is connected to the air outlet 301 opened on the inner and outer duct baffles 3. The two side walls of the guide vane 2 are provided with nozzles 202 that are connected to the guide cavity. The guide cavity is used to inject the outer duct gas into the inner cavity and mix it with the inner cavity gas. An adjustment component is provided in the guide cavity of the guide vane 2. The adjustment component is used to adjust the opening area of ​​the nozzles 202.

[0023] Based on this, the guide plate 2 is arranged axially between the inner and outer duct baffles 3 and the inner cone 1 along the flow channel of the afterburner, that is, it is located in the inner flow channel. A guide cavity is opened inside the guide plate 2, and the air inlet of the guide cavity is connected to the inlet 301 on the inner and outer duct baffles 3. Thus, the high-pressure outer duct gas enters the guide cavity through the inlet 301, and the high pressure characteristics of the outer duct gas itself form a jet gas source. The two side walls of the guide plate 2 are provided with nozzles 202 that are connected to the guide cavity. The guide cavity injects the outer duct gas into the inner flow channel through the nozzles 202 and mixes with the inner flow channel gas. Unlike existing mixers that rely on passive mixing through shearing of the inner and outer bypass airflows or flow-direction vortices, this embodiment uses a guide cavity to eject the outer bypass air through nozzles 202 on both side walls along the circumference of the afterburner flow channel, i.e., into the inner cavity on both sides of the guide plate 2, forming a transverse jet. This jet mixes with the axially flowing inner cavity air. Specifically, this embodiment utilizes the high-speed characteristics generated when the outer bypass air mixes with the inner cavity air to assist in mixing. The outer bypass air is introduced into the rear bypass ejector and injected into the inner cavity through nozzles 202 on the side walls of the guide plate 2. Taking advantage of the reduced pressure and increased velocity of the outer bypass air after ejection, a transverse jet with a high momentum ratio is formed, thereby accelerating the mixing of the outer bypass air and the inner cavity air through the generated complex vortex system. Furthermore, an adjustment component is installed within the guide cavity to adjust the opening area of ​​the nozzles 202. As the bypass ratio of the variable cycle engine continuously changes, the total pressure ratio between the outer and inner ducts dynamically changes accordingly. The adjustment component adjusts the effective opening area of ​​the nozzles 202 to achieve pressure matching under different operating conditions, ensuring that a reasonable jet momentum ratio is maintained under all operating conditions.

[0024] In this embodiment, the adjustment component includes a sliding base 203 and a slider 204. The sliding base 203 has a groove, and the slider 204 slides within the groove. A through-hole, penetrating the thickness of the sliding base 203, is provided on the sliding base 203 within the sliding range of the slider 204. This through-hole forms a nozzle 202. When the slider 204 slides along the groove, it can change the area of ​​obstruction of the through-hole, thereby adjusting the opening area of ​​the nozzle 202. Preferably, each sliding base 203 has two sliders 204, located on the same side of the sliding base 203, and both sliders 204 slide within the groove. The two sliders 204 are configured to move relative to each other or in opposite directions along the groove, thereby changing the area of ​​obstruction of the through-hole by the two sliders 204, and thus adjusting the opening area of ​​the nozzle 202. Specifically, firstly, the area of ​​the nozzle 202 can be continuously adjusted through the simple mechanical movement of two sliders 204 sliding towards or away from each other. This design is compact, highly reliable, and suitable for the harsh working environment of the afterburner under high temperature and pressure. Secondly, because the total pressure ratio of the outer and inner components of the variable cycle engine continuously and dynamically changes within the range of 1.2 to 1.5 under different flight modes such as subsonic cruise, transonic maneuvering, and supersonic sprint, adjusting the opening area of ​​the nozzle 202 can change the effective flow area of ​​the outer bypass gas in real time. This achieves pressure matching between the outer bypass gas flow rate and the inner airflow, ensuring that the pressure difference inside and outside the nozzle 202 remains within a reasonable range conducive to the formation of a high momentum ratio transverse jet under various operating conditions. Thirdly, the sliding base 203 and the guide plate 2 are integrally formed, improving the long-term reliability of the adjustment mechanism.

[0025] Furthermore, those skilled in the art will understand that the slider 204 can be driven in, but is not limited to, the following ways: by an actuator (such as a hydraulic actuator or an electric cylinder) via a linkage mechanism to push the slider 204 to slide, or by a gear and rack mechanism to convert rotational motion into linear motion of the slider 204, or by using smart materials such as shape memory alloys to drive the slider 204 to move. All of the above driving methods do not depart from the scope of protection of this invention.

[0026] In this embodiment, the cooperation between the slider 204 and the slide groove can adopt various structural designs to adapt to the high-temperature and vibration working environment of the afterburner, ensuring the motion accuracy and long-term reliability of the adjustment component. To prevent the slider 204 from being accidentally displaced due to vibration or aerodynamic forces during operation, a limiting structure is also provided on the sliding base 203. Preferably, the limiting structure includes limiting blocks disposed at both ends of the slide groove. The limiting blocks are used to limit the maximum sliding stroke of the slider 204, preventing the slider 204 from sliding out of the slide groove and causing the adjustment function to fail. The limiting blocks and the sliding base 203 are integrally formed or separately fixedly connected. More preferably, the sliding base 203 is also provided with a locking structure, which is used to lock the slider 204 after it is adjusted to the target position. When the afterburner is running for a long time in a certain stable working mode, the locking structure fixes the slider 204 in the current position, preventing the slider 204 from being slightly displaced due to airflow pulsation or vibration, and ensuring the long-term stability of the nozzle 202 opening area. The locking structure includes, but is not limited to, shape memory alloy locking rings. It is understood that the locking structure is only used when a fixed adjustment position needs to be maintained for an extended period. During mode transitions in the variable cycle engine, the locking structure is released to allow the slider 204 to slide freely for adjustment.

[0027] Those skilled in the art will understand that the above-mentioned matching scheme, limiting block and locking structure and other technical features can be combined and used according to actual working conditions. For example, a dovetail groove can be used with rollers to take into account the requirements of preventing pull-out and low friction. The above combination methods do not depart from the protection scope of the present invention.

[0028] In this embodiment, the guide plate 2 includes two side plates 201 arranged radially opposite each other along the flow channel of the afterburner. A flow guiding gap is provided between the two side plates 201, forming a flow guiding cavity. Further, the two side plates 201 are fitted together on the side facing the incoming flow direction of the internal airflow to form the leading edge of the guide plate 2, and the two side plates 201 are separated from each other on the side away from the incoming flow direction (i.e., the downstream end of the guide plate 2), and are sealed with a vertical plate to form the trailing edge of the guide plate 2. Thus, the flow guide cavity has a configuration that gradually expands from the leading edge to the trailing edge in the axial direction. Preferably, the width of the two side plates 201 gradually decreases from the outside to the inside in the radial direction of the afterburner flow channel. The width of the side plate 201 refers to the dimension of the side plate 201 in the axial direction of the afterburner flow channel. That is, the side plate 201 gradually narrows from the inner and outer duct baffles 3 to the inner cone 1, and the leading edge extends obliquely in the radial direction of the afterburner flow channel, so that the leading edge of the flow guide plate 2 forms a swept-back distribution relative to the afterburner flow channel.

[0029] The swept-back leading edge structure adapts to the direction of the internal airflow. When the internal airflow flows axially along the afterburner channel, the swept-back leading edge causes the leading edge line of the guide vane 2 facing the incoming flow to be radially inclined. Compared to a straight leading edge, the swept-back leading edge reduces the wind resistance when the internal airflow impacts the leading edge, allowing the internal airflow to smoothly flow around both sides of the guide vane 2 along the leading edge surface. This avoids large-scale flow separation and stagnation losses at the leading edge, thereby reducing the form drag and pressure drag of the internal airflow passing through the guide vane 2. Simultaneously, the gradually decreasing width of the side plate 201 not only reduces the total contact area between the outer wall of the guide vane 2 and the internal airflow, but also reduces the frictional and form drag of the internal airflow passing through the guide vane 2. Furthermore, it gives the overall configuration of the guide cavity a fan-shaped profile that contracts and extends from the leading edge to the trailing edge. The contraction profile causes the sidewalls of the flow guide cavity (i.e., the inner walls of the two side plates 201) to converge along the axial direction of the afterburner flow channel. This can guide the bypass gas flowing radially in the flow guide cavity to gradually change direction as it flows toward the trailing edge, smoothly transitioning to the outlet direction of the nozzle 202, and reducing flow separation and local vortex dissipation of the bypass gas during the turning and acceleration process in the flow guide cavity.

[0030] As a further optimization, the two side plates 201 are fitted together on the side facing the incoming flow direction of the internal airflow to form the leading edge of the guide plate 2. The two side plates 201 are separated from each other on the side away from the incoming flow direction and are blocked by vertical plates to form the trailing edge of the guide plate 2. This makes the spacing of the guide gap gradually increase along the axial direction of the afterburner flow channel until the maximum spacing is reached on the side of the guide plate 2 where the nozzle 202 is opened, so that the guide cavity has a flared structure. The vertical plate extends radially along the afterburner flow channel, and its two ends are fixedly connected to the trailing edge ends of the two side plates 201 respectively (such as by welding, riveting or integral molding), sealing the opening between the trailing edges of the two side plates 201. This prevents the external bypass gas from flowing directly out of the trailing edge in the guide cavity, thereby forcing all the external bypass gas in the guide cavity to turn and flow through the nozzle 202 opened on the side wall of the trailing edge of the two side plates 201 to be discharged, ensuring the flow rate and pressure stability of the external bypass gas ejected along the transverse jet.

[0031] Based on this, in this embodiment, multiple nozzles 202 are provided. These multiple nozzles 202 are radially distributed along the flow channel of the afterburner at the trailing edge of the guide plate 2. Because the afterburner is an annular structure and multiple duct ejectors are provided and uniformly arranged along the circumference of the inner cone 1, the inner flow channel has a certain width in the radial direction (i.e., the radial distance from the outer wall of the inner cone 1 to the inner wall of the inner and outer duct partitions 3). The multiple nozzles 202 are arranged radially at intervals, so that the outlet of each nozzle 202 is distributed radially within the entire width of the inner flow channel. Thus, the spanwise jet distribution of the duct gas ejected from each nozzle 202 forms a jet array covering the entire width of the flow channel in the radial direction, realizing a large-scale distribution of the duct gas in the spanwise direction and ensuring the mixing uniformity of the inner and outer duct gas within the circumferential range of the entire annular flow channel.

[0032] Because the afterburner is an annular structure, the flow distribution of the internal gas at different radial positions is not uniform. That is, the internal flow area on the radial outer side (the side closer to the inner and outer duct partitions 3) is larger, so the internal gas flow is larger; the internal flow area on the radial inner side (the side closer to the inner cone 1) is smaller, so the internal gas flow is smaller. In order to avoid the problem of inconsistent jet penetration depth and uneven mixing at different radial positions, the opening area of ​​the nozzle 202 in this embodiment gradually decreases from the outside to the inside along the radial direction of the afterburner flow channel.

[0033] Based on this, in order to increase the mixing efficiency of the jet and the internal gas, in this embodiment, each nozzle 202 is a rectangular hole with its long side extending axially along the flow channel of the afterburner. Specifically, the long side of the rectangular hole determines the initial width of the jet in the axial direction of the flow channel of the afterburner. For the transverse jet, when the jet is injected into the axial internal gas flow along the spanwise direction, a larger shear layer can be formed in the initial stage of the jet, thereby promoting momentum exchange between the jet and the internal gas and increasing the penetration depth of the jet. Based on this, in this embodiment, the moving direction of the slider 204 is set parallel to the long side of the rectangular hole. Specifically, the slider 204 is parallel to the long side of the rectangular hole along the sliding direction of the groove (i.e., parallel to the axial direction of the flow channel of the afterburner). The two sliders 204 slide towards each other or away from each other from the short side of the rectangular hole to change the obstruction area of ​​the rectangular hole, thereby adjusting the opening area of ​​the nozzle 202.

[0034] This application also discloses an afterburner, the flow channel of which is composed of an outer cylinder 4, inner and outer duct baffles 3, a rear duct ejector and an inner cone 1 from the outside to the inside. The inner and outer duct baffles 3 are fitted on the air inlet end of the outer cylinder 4 and have an air outlet 301. The area between the inner and outer duct baffles 3 and the inner cone 1 is the inner duct, and the area between the inner and outer duct baffles 3 and the outer cylinder 4 is the outer duct. Multiple rear duct ejectors are provided and are evenly arranged along the circumference of the inner cone 1.

[0035] Furthermore, the number of post-duct ejectors can be 9, 18, 27, or 36. It is understood that the specific number of post-duct ejectors can be optimized based on the diameter of the afterburner and the duct ratio design parameters: afterburners with larger diameters or higher duct ratios can have a larger number of ejectors (e.g., 27 or 36) to ensure sufficiently small spacing between adjacent circumferential ejectors and full overlap of the jet influence zone in the circumferential direction; afterburners with smaller diameters or lower duct ratios can have a smaller number of ejectors (e.g., 9 or 18) to simplify the structure and reduce weight. Those skilled in the art can reasonably select the specific arrangement number of post-duct ejectors according to actual operating conditions and structural space constraints; these variant schemes do not depart from the scope of protection of this application.

[0036] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rear duct ejector, applied to an afterburner flow channel, wherein the afterburner flow channel comprises, from the outside to the inside, an outer cylinder, inner and outer duct baffles, and an inner cone, the inner and outer duct baffles being sleeved on the air inlet end of the outer cylinder, and the inner and outer duct baffles having air inlets, the area between the inner and outer duct baffles and the inner cone being the inner duct, and the area between the inner and outer duct baffles and the outer cylinder being the outer duct, characterized in that... include: A guide vane is disposed along the axial direction of the afterburner flow channel between the inner and outer duct baffles and the inner cone; The guide plate has a guide cavity inside, and the air inlet of the guide cavity is connected to the flow outlet opened on the inner and outer duct partitions. The two side walls of the guide plate have spray holes that are connected to the guide cavity. The guide cavity is used to inject the outer duct air into the inner duct and mix it with the inner duct air. An adjustment component is provided inside the flow guide cavity of the guide plate, and the adjustment component is used to adjust the opening area of ​​the nozzle.

2. The rear duct ejector according to claim 1, characterized in that, The adjustment assembly includes a sliding base and a slider; the sliding base is provided with a sliding groove, and the slider slides in cooperation with the sliding groove. A through hole extending through the thickness direction of the sliding base is provided on the sliding base within the sliding range of the slider, and the through hole constitutes the spray hole; when the slider slides along the groove, it can change the area of ​​the through hole to adjust the opening area of ​​the spray hole.

3. The rear duct ejector according to claim 2, characterized in that, Each of the sliding bases is provided with two sliders, which are located on the same side of the sliding base and are slidably engaged with the groove. The two sliders are configured to move relative to each other or in opposite directions along the groove to change the area of ​​the two sliders blocking the through hole, thereby adjusting the opening area of ​​the nozzle.

4. The rear duct ejector according to claim 3, characterized in that, The sliding base and the guide plate are integrally formed.

5. The rear duct ejector according to claim 1, characterized in that, The guide plate includes two side plates arranged radially opposite each other along the flow channel of the afterburner, and a flow guide gap is provided between the two side plates, the flow guide gap forming the flow guide cavity.

6. The rear duct ejector according to claim 5, characterized in that, The two side plates are fitted together on the side facing the direction of the incoming airflow to form the leading edge of the guide plate. The width of the side plates gradually decreases from the outside to the inside in the radial direction of the afterburner flow channel, and the leading edge extends obliquely in the radial direction of the afterburner flow channel so that the leading edge of the guide plate forms a swept-back distribution relative to the afterburner flow channel.

7. The rear duct ejector according to claim 6, characterized in that, The spacing of the flow guide gap gradually increases along the axial direction of the afterburner flow channel until the maximum spacing is reached on the side of the flow guide plate where the nozzle is opened, so that the flow guide cavity has a flared structure.

8. The rear duct ejector according to claim 1, characterized in that, The nozzles are provided in multiple manner, and the multiple nozzles are radially distributed along the flow channel of the afterburner at the trailing edge of the guide plate.

9. The rear duct ejector according to claim 8, characterized in that, Each of the nozzles is a rectangular hole with its long side extending axially along the flow channel of the afterburner, and the opening area of ​​the nozzle gradually decreases from the outside to the inside along the radial direction of the flow channel of the afterburner.

10. An afterburner, characterized in that, Includes a rear duct ejector according to any one of claims 1-9, wherein multiple rear duct ejectors are provided and are evenly arranged along the circumference of the inner cone.

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