A trailing edge adjustable low-resistance high-efficiency flame stabilizer

Abstract

This invention discloses a low-resistance, high-efficiency flame stabilizer with adjustable trailing edge, comprising a center flame stabilizer, a first adjustment module, and a second adjustment module. The center flame stabilizer is a blunt-body flame stabilizer, including a head, a first wall plate, and a second wall plate. The first and second adjustment modules have identical structures, each including a first adjustment plate, a second adjustment plate, a rotating shaft, m first pivot rings, m second pivot rings, m third pivot rings, a return spring, and a drive tube. This invention can adjust the opening of the first and second adjustment modules according to the mainstream fuel supply pressure, achieving a balance between high-efficiency combustion and low flow resistance loss performance under different operating conditions, thereby meeting the requirement of improving the overall performance of the combustion chamber.

Description

Technical Field

[0001] This invention relates to the field of afterburner / ramjet combustors for aero engines, with the aim of achieving a balance between efficient combustion and low flow loss under different operating conditions, in order to meet the design requirements of optimal overall performance. Background Technology

[0002] As a crucial component of the afterburner / ramjet combustion chamber, the flame stabilizer plays a vital role in establishing a stable ignition source and maintaining stable combustion within the high-speed airflow of the combustion chamber. As the airflow passes through the flame stabilizer, a low-speed recirculation zone is formed behind it. Fuel injected through the fuel supply system mixes with air to form a fuel-air mixture, which is then entrained into the recirculation zone and ignited there. The high-temperature combustion products are transported upstream by the recirculation zone to further ignite the fresh fuel-air mixture, thus achieving stable combustion.

[0003] To meet the demands of future aerospace strategies, aircraft need to evolve towards higher Mach numbers and altitudes, thus requiring afterburners or ramjet combustors with superior combustion performance. The increased Mach numbers and altitudes of aircraft make combustor inlet conditions more severe, posing numerous challenges to the design of high-performance afterburner or ramjet combustor flame stabilizers: 1. Maintaining efficient and stable combustion in the combustor is difficult under high inlet airflow velocities. Increased inlet airflow velocity leads to increased fuel droplet velocity within the combustor, significantly shortening the residence time of fuel droplets in the stabilizer recirculation zone. This shortened residence time poses a significant challenge to stabilizer ignition and flame stabilization. Simultaneously, increased mainstream velocity makes flame propagation and mass exchange from the stabilizer recirculation zone to the mainstream more difficult, resulting in a large number of fuel droplets failing to participate in combustion in time, leading to low combustion efficiency. 2. Decreased inlet oxygen content causes a decrease in combustion reaction rate, resulting in reduced combustion efficiency. The continuous increase in aircraft flight altitude and afterburner or ramjet combustor inlet temperature causes a sharp decrease in the oxygen content of the combustor inlet airflow. Under these imported conditions, conventional afterburner stabilizers are insufficient to meet design requirements in order to maintain high combustion efficiency.

[0004] To achieve efficient combustion of the stabilizer under harsh inlet conditions, it is necessary to enhance the mixing of the main flow and the intermediate flow. However, when the inlet flow conditions support the combustion of the stabilizer, strong mixing of the main flow and the intermediate flow does not contribute much to improving combustion efficiency. On the contrary, strong mixing will cause a strong total pressure loss.

[0005] Therefore, it is necessary to improve afterburner and ramjet combustors. On the one hand, this should enhance the mass exchange between the recirculation zone and the mainstream while maintaining flame stability, thereby improving mainstream combustion and maintaining high combustion efficiency under more severe inlet conditions. On the other hand, when inlet flow conditions are favorable for combustion, the mixing between the recirculation zone and the mainstream should be appropriately reduced to decrease flow losses. Ultimately, the goal is to achieve a balance between high-efficiency combustion and low flow resistance loss, meeting the performance requirements of future advanced afterburner and ramjet combustors. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the design challenges involved in the background art by providing an adjustable trailing edge flame stabilizer that enhances the mixing of the main stream and the standby stream.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A trailing edge adjustable low-resistance high-efficiency flame stabilizer includes a center flame stabilizer, a first adjustment module, and a second adjustment module.

[0009] The central flame stabilizer is a blunt body flame stabilizer, including a head, a first wall plate and a second wall plate. The upstream of both the first wall plate and the second wall plate is fixed to the head, and the distance between the first wall plate and the second wall plate gradually increases from upstream to downstream.

[0010] The first adjustment module and the second adjustment module have the same structure, each including a first adjustment plate, a second adjustment plate, a rotating shaft, m first pivot rings, m second pivot rings, m third pivot rings, a reset spring and a drive tube, where m is a natural number greater than or equal to 2;

[0011] The first and second adjusting plates have the same structure, and each of them has a mixing structure at its tail edge, where a is a natural number greater than or equal to 3;

[0012] The m first pivot rings, m second pivot rings, and m third pivot rings have the same structure, are arranged alternately, and are all pivotally connected to the rotation axis; the m first pivot rings are all fixedly connected to the upstream of the first adjusting plate, and the m second pivot rings are all fixedly connected to the upstream of the second adjusting plate, so that the first adjusting plate and the second adjusting plate can rotate freely around the rotation axis;

[0013] The first adjusting plate has a first reset blind hole at its center on the side near the second adjusting plate, and the second adjusting plate has a second reset blind hole at its center on the side near the first adjusting plate, which corresponds to the first reset blind hole. One end of the reset spring is fixedly connected to the bottom end of the first reset blind hole, and the other end is fixedly connected to the bottom end of the second reset blind hole, and is in a stretched state, so that the first adjusting plate and the second adjusting plate fit together.

[0014] The cross-section of the drive tube is rectangular, including a first end wall, a second end wall, and first to fourth side walls connected end to end in sequence;

[0015] The drive tube has a straight oil passage between the center of its first end wall and the center of its second end wall;

[0016] The drive tube has p first piston cavities equidistantly arranged between its first sidewall and the oil passage along its length direction, and p second piston cavities corresponding one-to-one with the first piston cavities between its second sidewall and the oil passage, where p is a natural number greater than or equal to 2.

[0017] The first piston cavity and the second piston cavity have the same structure, are cylindrical, and have an axis perpendicular to the first side wall. One end is provided with a piston hole that passes through the side wall of the drive tube and connects to the outside, and the other end is provided with an oil hole that connects to the oil circuit.

[0018] Both the first piston cavity and the second piston cavity are equipped with pistons. The piston head and its side wall are connected in a sealed sliding manner, and the piston rod extends from its piston hole to the outside of the drive tube.

[0019] The first adjusting plate has a first mounting groove parallel to the rotation axis on the side near the second adjusting plate, which is used to cooperate with the drive tube; the second adjusting plate has a second mounting groove parallel to the rotation axis on the side near the first adjusting plate, which is used to cooperate with the drive tube.

[0020] In the first adjustment module, each of the m third pivot rings is fixedly connected to the downstream of the first wall plate; the two ends of the drive tube of the first adjustment module are fixedly connected to the two side walls of the combustion chamber respectively, located in the first mounting slot and the second mounting slot of the first adjustment module, and the two ends of the oil circuit of the drive tube of the first adjustment module are connected to the main oil supply system of the combustion chamber, which is used to control the opening and closing degree between the first adjustment plate and the second adjustment plate of the first adjustment module.

[0021] In the second adjustment module, each of the m third pivot rings is fixedly connected to the downstream of the second wall plate; the two ends of the drive tube of the second adjustment module are fixedly connected to the two side walls of the combustion chamber respectively, located in the first and second mounting slots of the second adjustment module, and the two ends of the oil circuit of the drive tube of the second adjustment module are connected to the main oil supply system of the combustion chamber to control the opening and closing degree between the first and second adjustment plates of the second adjustment module.

[0022] When the first adjustment plate and the second adjustment plate of the first adjustment module are attached together, their thickness is the same as that of the first wall panel and they are coplanar with the first wall panel; when the first adjustment plate and the second adjustment plate of the second adjustment module are attached together, their thickness is the same as that of the second wall panel and they are coplanar with the second wall panel.

[0023] As a further optimization of the low-resistance, high-efficiency flame stabilizer with adjustable trailing edge of the present invention, the center flame stabilizer adopts any one of a V-shaped flame stabilizer, an evaporation tank flame stabilizer, an intake stabilizer, and a thin-film evaporation stabilizer.

[0024] As a further optimization of the low-resistance, high-efficiency flame stabilizer with adjustable trailing edge of the present invention, the mixing structure adopts any one or more of the following: lobes, sawtooth, and bosses.

[0025] As a further optimization of the trailing edge adjustable low-resistance high-efficiency flame stabilizer of the present invention, p is set to 3.

[0026] The present invention adopts the above technical solution and has the following technical effects:

[0027] This invention can change the opening of the regulating plate according to different working conditions to achieve a balance between high-efficiency combustion and low flow resistance loss performance under different working conditions, thereby meeting the design requirements of better overall performance of the stabilizer.

[0028] In this invention, the drive tube is connected to the main fuel supply system of the combustion chamber, and the opening between the first and second adjustment plates can be adjusted according to the main fuel supply pressure. The structure is simple and easy to implement. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the central flame stabilizer in this invention.

[0031] Figure 3 This is a schematic diagram of the structure of the first adjustment module of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the driving transistor of the present invention;

[0033] Figure 5 This is a schematic cross-sectional view of the drive tube of the present invention at its first piston cavity and second piston cavity;

[0034] Figure 6 This is a cross-sectional view of the first and second adjustment modules of the present invention when they are completely closed;

[0035] Figure 7 This is a cross-sectional view of the first and second adjustment modules of the present invention when they are fully open.

[0036] In the figure, 1-Central flame stabilizer, 2-First adjustment module, 3-Second adjustment module, 4-Combustion chamber wall, 5-Head of the central flame stabilizer, 6-First wall plate, 7-Second wall plate, 8-Third pivot ring in the first adjustment module, 9-Rotating shaft in the first adjustment module, 10-First adjustment plate, 11-Second adjustment plate, 12-Blending structure, 13-Second mounting groove, 14-First pivot ring, 15-Second pivot ring, 16-Drive tube, 17-Oil passage in the drive tube, 18-Piston rod of the piston on the drive tube, 19-First piston cavity, 20-Second piston cavity. Detailed Implementation

[0037] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0038] This invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully express the scope of the invention to those skilled in the art. In the drawings, components are enlarged for clarity.

[0039] It should be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are merely used to distinguish elements, components, and / or parts from one another. Therefore, the first element, component, and / or part discussed below may be a second element, component, or part without departing from the teachings of this invention.

[0040] like Figure 1 As shown, the present invention discloses a low-resistance, high-efficiency flame stabilizer with adjustable trailing edge, including a center flame stabilizer, a first adjustment module, and a second adjustment module.

[0041] like Figure 2 As shown, the central flame stabilizer is a blunt body flame stabilizer, including a head, a first wall plate and a second wall plate. The upstream of both the first wall plate and the second wall plate is fixed to the head, and the distance between the first wall plate and the second wall plate gradually increases from upstream to downstream.

[0042] The first adjustment module and the second adjustment module have the same structure, each including a first adjustment plate, a second adjustment plate, a rotating shaft, m first pivot rings, m second pivot rings, m third pivot rings, a reset spring and a drive tube, where m is a natural number greater than or equal to 2;

[0043] like Figure 3 As shown, the first adjustment plate and the second adjustment plate have the same structure, and each of them has a mixing structure at its tail edge, where a is a natural number greater than or equal to 3.

[0044] The m first pivot rings, m second pivot rings, and m third pivot rings have the same structure, are arranged alternately, and are all pivotally connected to the rotation axis; the m first pivot rings are all fixedly connected to the upstream of the first adjusting plate, and the m second pivot rings are all fixedly connected to the upstream of the second adjusting plate, so that the first adjusting plate and the second adjusting plate can rotate freely around the rotation axis;

[0045] The first adjusting plate has a first reset blind hole at its center on the side near the second adjusting plate, and the second adjusting plate has a second reset blind hole at its center on the side near the first adjusting plate, which corresponds to the first reset blind hole. One end of the reset spring is fixedly connected to the bottom end of the first reset blind hole, and the other end is fixedly connected to the bottom end of the second reset blind hole, and is in a stretched state, so that the first adjusting plate and the second adjusting plate fit together.

[0046] like Figure 4 As shown, the cross-section of the drive tube is rectangular, including a first end wall, a second end wall, and first to fourth side walls connected end to end in sequence;

[0047] The drive tube has a straight oil passage between the center of its first end wall and the center of its second end wall;

[0048] like Figure 5 As shown, the drive tube has p first piston cavities equidistantly arranged between its first sidewall and the oil passage along its length direction, and p second piston cavities corresponding one-to-one with the first piston cavities between its second sidewall and the oil passage, where p is a natural number greater than or equal to 2.

[0049] The first piston cavity and the second piston cavity have the same structure, are cylindrical, and have an axis perpendicular to the first side wall. One end is provided with a piston hole that passes through the side wall of the drive tube and connects to the outside, and the other end is provided with an oil hole that connects to the oil circuit.

[0050] Both the first piston cavity and the second piston cavity are equipped with pistons. The piston head and its side wall are connected in a sealed sliding manner, and the piston rod extends from its piston hole to the outside of the drive tube.

[0051] The first adjusting plate has a first mounting groove parallel to the rotation axis on the side near the second adjusting plate, which is used to cooperate with the drive tube; the second adjusting plate has a second mounting groove parallel to the rotation axis on the side near the first adjusting plate, which is used to cooperate with the drive tube.

[0052] In the first adjustment module, each of the m third pivot rings is fixedly connected to the downstream of the first wall plate; the two ends of the drive tube of the first adjustment module are fixedly connected to the two side walls of the combustion chamber respectively, located in the first mounting slot and the second mounting slot of the first adjustment module, and the two ends of the oil circuit of the drive tube of the first adjustment module are connected to the main oil supply system of the combustion chamber, which is used to control the opening and closing degree between the first adjustment plate and the second adjustment plate of the first adjustment module.

[0053] In the second adjustment module, each of the m third pivot rings is fixedly connected to the downstream of the second wall plate; the two ends of the drive tube of the second adjustment module are fixedly connected to the two side walls of the combustion chamber respectively, located in the first and second mounting slots of the second adjustment module, and the two ends of the oil circuit of the drive tube of the second adjustment module are connected to the main oil supply system of the combustion chamber to control the opening and closing degree between the first and second adjustment plates of the second adjustment module.

[0054] like Figure 6 As shown, when the first adjustment plate and the second adjustment plate of the first adjustment module are attached together, their thickness is the same as that of the first wall panel and they are coplanar with the first wall panel; when the first adjustment plate and the second adjustment plate of the second adjustment module are attached together, their thickness is the same as that of the second wall panel and they are coplanar with the second wall panel.

[0055] As a further optimization of the low-resistance, high-efficiency flame stabilizer with adjustable trailing edge of the present invention, the center flame stabilizer adopts any one of a V-shaped flame stabilizer, an evaporation tank flame stabilizer, an intake stabilizer, and a thin-film evaporation stabilizer.

[0056] As a further optimization of the low-resistance, high-efficiency flame stabilizer with adjustable trailing edge of the present invention, the mixing structure adopts any one or more of the following: lobes, sawtooth, and bosses.

[0057] As a further optimization of the trailing edge adjustable low-resistance high-efficiency flame stabilizer of the present invention, p is set to 3.

[0058] The drive pipe is connected to the main fuel supply system of the combustion chamber. When fuel is supplied to the oil circuit in the drive pipe, the piston rods of each piston extend under the action of oil pressure, lifting the first and second adjusting plates. The opening of the adjusting plates is adjusted according to the oil pressure. This is the high-efficiency working mode of the stabilizer under harsh combustion conditions, which can meet the purpose of efficient mixing of the main fuel supply and the standby airflow under different main fuel supply conditions in the afterburner or ram combustion chamber. Figure 7 As shown; when the fuel in the oil circuit of the drive pipe is evacuated, the piston rods of each piston retract, and the first and second adjusting plates are in contact, parallel to the first and second wall plates of the stabilizer. At this time, the stabilizer operates in a low flow resistance mode when combustion conditions are good. Figure 6As shown in the figure. The above solution can achieve a balance between high-efficiency combustion and low flow resistance loss performance under different operating conditions, thus meeting the design requirements for better overall performance of the stabilizer.

[0059] This invention can adjust the opening of the first and second adjustment modules according to the mainstream fuel supply pressure, so as to achieve a balance between high-efficiency combustion and low flow resistance loss performance under different working conditions, and achieve the design requirement of better overall performance of the stabilizer.

[0060] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-drag high-efficiency flame holder with adjustable tail edge, characterized by, Includes a central flame stabilizer, a first adjustment module, and a second adjustment module; The central flame stabilizer is a blunt body flame stabilizer, including a head, a first wall plate and a second wall plate. The upstream of both the first wall plate and the second wall plate is fixed to the head, and the distance between the first wall plate and the second wall plate gradually increases from upstream to downstream. The first adjustment module and the second adjustment module have the same structure, each including a first adjustment plate, a second adjustment plate, a rotating shaft, m first pivot rings, m second pivot rings, m third pivot rings, a reset spring and a drive tube, where m is a natural number greater than or equal to 2; The first and second adjusting plates have the same structure, and each of them has a mixing structure at its tail edge, where a is a natural number greater than or equal to 3. The m first pivot rings, m second pivot rings, and m third pivot rings have the same structure, are arranged alternately, and are all pivotally connected to the rotation axis; the m first pivot rings are all fixedly connected to the upstream of the first adjusting plate, and the m second pivot rings are all fixedly connected to the upstream of the second adjusting plate, so that the first adjusting plate and the second adjusting plate can rotate freely around the rotation axis; The first adjusting plate has a first reset blind hole at its center on the side near the second adjusting plate, and the second adjusting plate has a second reset blind hole at its center on the side near the first adjusting plate, which corresponds to the first reset blind hole. One end of the reset spring is fixedly connected to the bottom end of the first reset blind hole, and the other end is fixedly connected to the bottom end of the second reset blind hole, and is in a stretched state, so that the first adjusting plate and the second adjusting plate fit together. The cross-section of the drive tube is rectangular, including a first end wall, a second end wall, and first to fourth side walls connected end to end in sequence; The drive tube has a straight oil passage between the center of its first end wall and the center of its second end wall; The drive tube has p first piston cavities equidistantly arranged between its first sidewall and the oil passage along its length direction, and p second piston cavities corresponding one-to-one with the first piston cavities between its second sidewall and the oil passage, where p is a natural number greater than or equal to 2. The first piston cavity and the second piston cavity have the same structure, are cylindrical, and have an axis perpendicular to the first side wall. One end is provided with a piston hole that passes through the side wall of the drive tube and connects to the outside, and the other end is provided with an oil hole that connects to the oil circuit. Both the first piston cavity and the second piston cavity are equipped with pistons. The piston head and its side wall are connected in a sealed sliding manner, and the piston rod extends from its piston hole to the outside of the drive tube. The first adjusting plate has a first mounting groove parallel to the rotation axis on the side near the second adjusting plate, which is used to cooperate with the drive tube; the second adjusting plate has a second mounting groove parallel to the rotation axis on the side near the first adjusting plate, which is used to cooperate with the drive tube. In the first adjustment module, each of the m third pivot rings is fixedly connected to the downstream of the first wall plate; the two ends of the drive tube of the first adjustment module are fixedly connected to the two side walls of the combustion chamber respectively, located in the first mounting slot and the second mounting slot of the first adjustment module, and the two ends of the oil circuit of the drive tube of the first adjustment module are connected to the main oil supply system of the combustion chamber, which is used to control the opening and closing degree between the first adjustment plate and the second adjustment plate of the first adjustment module. In the second adjustment module, each of the m third pivot rings is fixedly connected to the downstream of the second wall plate; the two ends of the drive tube of the second adjustment module are fixedly connected to the two side walls of the combustion chamber respectively, located in the first and second mounting slots of the second adjustment module, and the two ends of the oil circuit of the drive tube of the second adjustment module are connected to the main oil supply system of the combustion chamber to control the opening and closing degree between the first and second adjustment plates of the second adjustment module. When the first adjustment plate and the second adjustment plate of the first adjustment module are attached together, their thickness is the same as that of the first wall panel and they are coplanar with the first wall panel; when the first adjustment plate and the second adjustment plate of the second adjustment module are attached together, their thickness is the same as that of the second wall panel and they are coplanar with the second wall panel.

2. The trailing edge adjustable low-resistance high-efficiency flame stabilizer according to claim 1, characterized in that, The central flame stabilizer can be any one of a V-type flame stabilizer, an evaporation tank flame stabilizer, an intake stabilizer, or a thin-film evaporation stabilizer.

3. The trailing edge adjustable low-resistance high-efficiency flame stabilizer according to claim 1, characterized in that, The hybrid structure adopts any one or more of the following: lobes, sawtooth, and bosses.

4. The trailing edge adjustable low-resistance high-efficiency flame stabilizer according to claim 1, characterized in that, The value of p is 3.

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