Support plate flame stabilizer with parallel crossed concave cavities

Abstract

The invention provides a support plate flame stabilizer with parallel crossed concave cavities. The support plate flame stabilizer comprises a flame stabilizing component and a support plate, the flame stabilizing component is arranged on the supporting plate, a first concave cavity extending in the direction perpendicular to the airflow inflow direction is formed in the flame stabilizing component, a second concave cavity extending in the direction perpendicular to the airflow inflow direction is formed in the supporting plate, and the first concave cavity is communicated with the second concave cavity so that the first concave cavity and / or the second concave cavity can form an airflow backflow area. According to the supporting plate flame stabilizer with the parallel crossed concave cavities, evaporation and mixing of fuel oil are facilitated, the stability of flames is improved, and the combustion efficiency can be effectively improved. Meanwhile, compared with the increase of the blocking width, the flame stabilizing component is provided with the first concave cavity, and the second concave cavity is formed in the supporting plate connected with the flame stabilizing component, so that the caused flow resistance loss is smaller.

Description

Technical Field

[0001] The invention relates to the field of aviation technology, in particular to a support plate flame stabilizer with parallel cross cavities. Background Art

[0002] The new generation of afterburning turbofan engines pursues a high thrust-to-weight ratio. In terms of the afterburner, it requires simple components, low cold flow resistance loss, a small proportion of the afterburner section length, and high afterburner combustion efficiency. The afterburner uses a flame stabilizer to stabilize the flame and organize combustion. The performance of the flame stabilizer is a decisive factor affecting the performance of the afterburner. Most of the new generation of afterburner turbofan engines use an integrated afterburner with an integrated design of a rectifier support plate and a flame stabilizer. However, the conventional support plate flame stabilizer produces a horseshoe-shaped vortex, which will lead to poor stability of the recirculation vortex near its wall, resulting in locally unstable combustion.

[0003] Due to the small proportion of the afterburner section length, the distance from the fuel injection to the trailing edge of the flame stabilizer becomes smaller accordingly. The fuel atomization, evaporation and mixing are not sufficient before ignition, which can easily lead to unstable combustion. When combined with the unstable combustion caused by the recirculation vortex, the combustion instability problem will be amplified, thereby affecting the combustion reaction process. The distance from the trailing edge of the flame stabilizer to the nozzle outlet becomes smaller accordingly, the combustion section becomes shorter, and the flame in the recirculation zone behind the flame stabilizer does not have time to spread horizontally throughout the entire combustion chamber. Part of the oil-gas mixture is not fully burned, and part of the oil-gas mixture does not participate in combustion and is directly discharged, which seriously affects the afterburner combustion efficiency. Summary of the invention

[0004] The invention provides a support plate flame stabilizer with parallel cross cavities, which is used to solve the problem that the stability of the recirculation vortex near the existing flame stabilizer is poor, which may lead to local unstable combustion.

[0005] The present invention provides a support plate flame stabilizer with parallel cross cavities, comprising: Flame stabilizing members and support plates; The flame stabilizing component is arranged on the support plate, and a first concave cavity extending perpendicularly to the airflow direction is formed in the flame stabilizing component, and a second concave cavity extending perpendicularly to the airflow direction is formed on the support plate, and the first concave cavity is connected to the second concave cavity so that the first concave cavity and / or the second concave cavity form a recirculation zone of the airflow.

[0006] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the flame stabilizing component comprises: A leading edge section, a middle section and a terminal section connected in sequence along the airflow direction; The width of the middle section is smaller than the widths of the front edge section and the terminal section, so that both sides of the middle section cooperate with the front edge section and the terminal section to form the first concave cavity.

[0007] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the support plate is provided with the second cavities on both sides corresponding to the middle section, and the two second cavities are respectively connected to the corresponding first cavities.

[0008] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the angle between the side of the first cavity and / or the second cavity close to the airflow direction and its bottom surface is less than or equal to the angle between the side of the first cavity and / or the second cavity away from the airflow direction and its bottom surface.

[0009] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the angle between the side of the first cavity and / or the second cavity close to the airflow inflow direction and its bottom surface is 90 degrees; The angle between the first cavity and / or the second cavity away from the airflow direction and its bottom surface is 130 degrees to 150 degrees.

[0010] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the first cavity and the second cavity are arranged perpendicular to each other.

[0011] According to a support plate flame stabilizer with parallel cross-cavities provided by the present invention, the depth of the first cavity is 12 mm to 20 mm, and the length is 18 mm to 40 mm; And / or, the second cavity has a depth of 12 mm to 20 mm and a length of 18 mm to 40 mm.

[0012] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the length of the support plate along the airflow inflow direction is 90 mm to 150 mm.

[0013] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the leading edge section is an elliptical cylinder, the major axis of the elliptical cylinder cross section is 1.7 to 2.5 times the minor axis, and the elliptical cylinder is tangent to the opening of the first cavity.

[0014] According to a support plate flame stabilizer with parallel cross cavities provided by the present invention, the terminal section is a truncated cone, and the angle of the terminal end of the truncated cone is 90 degrees to 120 degrees.

[0015] The support plate flame stabilizer with parallel cross-cavities provided by the present invention forms a first cavity extending perpendicularly to the airflow direction in the flame stabilizing component, and forms a second cavity extending perpendicularly to the airflow direction on the support plate, so that the first cavity and / or the second cavity form a reflux zone of the airflow, which is beneficial to the evaporation and mixing of the fuel, improves the stability of the flame, and can effectively improve the efficiency of combustion. At the same time, compared with increasing the blockage width, the present application sets the first cavity through the flame stabilizing component and sets the second cavity on the support plate connected thereto, which causes less flow resistance loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the support plate flame stabilizer with parallel cross cavities in the present invention.

[0018] Figure 2 It is a side view of a partial structure of a support plate flame stabilizer with parallel cross cavities in the present invention.

[0019] Figure 3 It is a front view of the support plate flame stabilizer with parallel cross cavities in the present invention.

[0020] Figure 4 It is a bottom view of the support plate flame stabilizer with parallel cross cavities in the present invention.

[0021] Figure 5 It is a top view of the support plate flame stabilizer with parallel cross cavities in the present invention.

[0022] Figure 6 The streamline of the support plate flame stabilizer with parallel cross cavities in the present invention Figure 1 .

[0023] Figure 7 The streamline of the support plate flame stabilizer with parallel cross cavities in the present invention Figure 2 .

[0024] Figure 8 The streamline of the support plate flame stabilizer with parallel cross cavities in the present invention Figure 3 .

[0025] Reference numerals: 10. Flame stabilizing component; 110. First concave cavity; 120. Leading edge section; 130. Middle section; 140. End section; 20. Support plate; 210. Second concave cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Combine the following Figure 1-Figure 8 A support plate flame holder with parallel cross-cavities according to the present invention is described.

[0028] An embodiment of the present application provides a support plate flame stabilizer with parallel cross cavities, such as Figures 1 to 5 As shown, the support plate flame stabilizer with parallel cross-cavities includes: a flame stabilizing component 10 and a support plate 20. The flame stabilizing component 10 is arranged on the support plate 20, and a first cavity 110 extending perpendicularly to the inflow direction of the airflow is formed in the flame stabilizing component 10, and a second cavity 210 extending perpendicularly to the inflow direction of the airflow is formed on the support plate 20, and the first cavity 110 is connected to the second cavity 210, and the tops of the first cavity 110 and the second cavity 210 are open, so that the first cavity 110 and / or the second cavity 210 form a reflow zone of the airflow.

[0029] In this embodiment, the flame stabilizing member 10 is mounted on the support plate 20. A first cavity 110 extending perpendicularly to the airflow direction is designed in the flame stabilizing member 10. The main function of the first cavity 110 is to guide the airflow to form a recirculation zone, thereby facilitating the evaporation of the fuel and the mixing with the air, thereby enhancing the stability of the flame and the combustion efficiency.

[0030] At the same time, the support plate 20 is also designed with a second cavity 210 extending perpendicularly to the airflow direction. The first cavity 110 and the second cavity 210 are connected, and the airflow can flow freely between the first cavity 110 and the second cavity 210, further enhancing the formation of the recirculation zone. The second cavity 210 is equivalent to extending the first cavity 110 in another direction, so that the second cavity 210 and the first cavity 110 form a recirculation zone together, optimizing the flow path of the airflow on the support plate 20, and further improving the stability and combustion efficiency of the flame.

[0031] At the same time, compared with the traditional method of increasing the blockage width, the present design causes smaller flow resistance loss through the concave cavity design on the flame stabilizing component 10 and the support plate 20, thereby improving the performance of the entire combustion system.

[0032] During operation, the oil-gas mixture forms a recirculation zone of the oil-gas mixture after passing through the first concave cavity 110 on the flame stabilizing member 10 and the second concave cavity 210 on the support plate 20. In this area, the speed and direction of the airflow will change, generating a recirculation vortex, which helps to further promote the mixing of fuel and air. The recirculation zone also increases the residence time of the oil-gas mixture in the combustion chamber, making the combustion more complete.

[0033] The support plate flame stabilizer with parallel cross-cavities provided in the embodiment of the present invention forms a first cavity 110 extending perpendicularly to the airflow direction in the flame stabilizing component 10, and forms a second cavity 210 extending perpendicularly to the airflow direction on the support plate 20, so that the first cavity 110 and / or the second cavity 210 form a reflux zone for the airflow, which is beneficial to the evaporation and mixing of the fuel, improves the stability of the flame, and can effectively improve the efficiency of combustion. At the same time, compared with increasing the blockage width, the present application sets the first cavity 110 through the flame stabilizing component 10 and sets the second cavity 210 on the support plate 20 connected thereto, which causes less flow resistance loss.

[0034] In some embodiments, Figures 1 to 5 As shown, the flame stabilizing component 10 includes: a leading edge segment 120, a middle segment 130 and an end segment 140 which are sequentially connected along the airflow direction; the width of the middle segment 130 is smaller than the width of the leading edge segment 120 and the end segment 140, so that both sides of the middle segment 130 cooperate with the leading edge segment 120 and the end segment 140 to form the first concave cavity 110.

[0035] In this embodiment, the leading edge section 120 is the starting part of the flame stabilizing member 10, which first meets the airflow from the combustion chamber. The width of the leading edge section 120 is relatively large, providing a smooth transition area for the airflow, helping to reduce the turbulence and vortex of the airflow, so that the airflow can enter the flame stabilizing member 10 more smoothly.

[0036] The middle section 130 is located between the leading edge section 120 and the terminal section 140, and its width is significantly smaller than that of the leading edge section 120 and the terminal section 140, so that a first concave cavity 110 is formed on both sides of the middle section 130 (i.e., at the connection with the leading edge section 120 and the terminal section 140). Because the contraction shape of the middle section 130 can accelerate the airflow and form a pressure difference on both sides thereof. This pressure difference causes the airflow to generate backflow when flowing through the middle section 130, The end section is the end portion of the flame stabilization component 10, and its width increases again, in contrast to the middle section 130. The design of the end section 140 helps to further guide the airflow and ensure that the airflow can maintain a certain speed and stability when leaving the flame stabilization component 10.

[0037] Accordingly, if Figures 1 to 5 As shown, second concave cavities 210 are formed on both sides of the support plate 20 corresponding to the middle section 130 , and the two second concave cavities 210 are respectively connected to the corresponding first concave cavities 110 .

[0038] Specifically, the second concave cavity 210 on the support plate 20 is located at positions corresponding to the two sides of the middle section 130 of the flame stabilizing component 10. This design ensures that the first concave cavity 110 and the second concave cavity 210 can be smoothly connected to form a continuous airflow channel. Each first concave cavity 110 is connected to a second concave cavity 210 on both sides, and the airflow can flow freely between the flame stabilizing component 10 and the support plate 20 without being blocked. This connectivity helps to enhance the turbulence and vortex of the airflow and promote the full mixing of fuel and air. The shape and size of the second concave cavity 210 are usually matched with the first concave cavity 110 to ensure that the airflow can flow smoothly from one concave cavity to another, which helps to reduce the energy loss of the airflow during the flow process and improve the combustion efficiency.

[0039] In some embodiments, Figures 1 to 5 As shown, the angle between the side of the first cavity 110 and / or the second cavity 210 close to the airflow inflow direction and its bottom surface is less than or equal to the angle between the side of the first cavity 110 and / or the second cavity 210 away from the airflow inflow direction and its bottom surface. The smaller angle close to the airflow inflow direction helps to guide the airflow into the cavity to form a recirculation zone, while the larger angle away from the airflow inflow direction helps to flow out after the recirculation vortex is formed in the cavity, thereby reducing the flow resistance.

[0040] like Figure 3 As shown, the angle between the side of the first cavity 110 away from the airflow direction and its bottom surface is α1. Figure 2 As shown, the angle between the second cavity 210 away from the airflow inflow direction and its bottom surface is α2. The width of the bottom of the first cavity 110 is L2, and the width of the bottom of the second cavity 210 is L3. The height of the flame stabilizing member 10 is H1, the depth of the second cavity 210 is H2, and the depth of the second cavity 210 is H3. The maximum width of the leading edge section 120 is W1, and the maximum width of the truncated cone is W2.

[0041] like Figure 6 As shown, Figure 6 The streamline of the support plate flame stabilizer with parallel cross cavities in the present invention Figure 1As can be seen from the figure, stable low-speed recirculation zones are formed at both the first cavity 110 and the second cavity 210, and the recirculation vortex stability at the boundary layer is good, which is conducive to achieving better flame stability performance.

[0042] Figure 7 The streamline of the support plate flame stabilizer with parallel cross cavities in the present invention Figure 2 As can be seen from the figure, a recirculation zone is formed in the cavity, which is conducive to the evaporation and mixing of the fuel; the recirculation zone has strong stability, which is conducive to more stable and efficient combustion.

[0043] Figure 8 The streamline of the support plate flame stabilizer with parallel cross cavities in the present invention Figure 3 As can be seen from the figure, the concave cavity structure does not block the flow channel, and the blocking width is greatly reduced compared with the conventional flame stabilizer, resulting in smaller flow resistance loss.

[0044] In a specific embodiment, the angle between the side of the first cavity 110 and / or the second cavity 210 close to the airflow direction and its bottom surface is 90 degrees, and the angle between the side of the first cavity 110 and / or the second cavity 210 away from the airflow direction and its bottom surface is 130 degrees to 150 degrees.

[0045] In this embodiment, one side of the first concave cavity 110 and / or the second concave cavity 210 is vertical, and the other side of the first concave cavity 110 and / or the second concave cavity 210 is an obtuse angle, thereby guiding the airflow into the concave cavity to form a recirculation zone, and flowing out from one side of the obtuse angle after a recirculation vortex is formed in the concave cavity, thereby reducing flow resistance.

[0046] In some embodiments, Figure 1 As shown, the first cavity 110 and the second cavity 210 are arranged perpendicular to each other.

[0047] In this embodiment, the first concave cavity 110 and the second concave cavity 210 are perpendicular to each other, and they together form a three-dimensional airflow channel, which helps to guide the airflow more effectively, so that a reflow zone is formed between the flame stabilizing component 10 and the support plate 20. It is equivalent to setting up only a single concave cavity, which can be used in larger scenarios and broaden the scope of application of the entire mechanism.

[0048] In some embodiments, Figures 1 to 5 As shown, the depth of the first cavity 110 is 12 mm to 20 mm, and the length is 18 mm to 40 mm, that is, the length-to-depth ratio is 1.5 to 2.0; and / or, the depth of the second cavity 210 is 12 mm to 20 mm, and the length is 18 mm to 40 mm, that is, the length-to-depth ratio is 1.5 to 2.0.

[0049] Reasonable design of the depth and length of the first cavity 110 and the second cavity 210 helps to ensure that the airflow can smoothly enter and flow through the cavity. A cavity that is too shallow or too deep may affect the flow effect of the airflow, while the appropriate depth can guide the airflow to form stable vortices and turbulence. Control of the length-to-depth ratio helps to ensure that the airflow can maintain a sufficient residence time in the cavity so as to be fully mixed with the fuel particles. By optimizing the size parameters of the cavity, the mixing of fuel and air can be more effectively promoted, thereby improving combustion efficiency. For example, when it is necessary to increase the residence time of the airflow, the depth of the first cavity 110 and / or the second cavity 210 can be increased. When it is necessary to reduce the residence time of the airflow, the depth of the first cavity 110 and / or the second cavity 210 can be reduced.

[0050] like Figure 2 and Figure 3 As shown, the length of the support plate 20 along the airflow inflow direction is 90 mm to 150 mm. That is, the chord length L1 of the support plate 20 is preferably 90 mm to 150 mm.

[0051] In some embodiments, Figure 1 As shown, the leading edge segment 120 is an elliptical cylinder, the major axis of the elliptical cylinder cross section is 1.7 to 2.5 times the minor axis, and the elliptical cylinder is tangent to the opening of the first cavity 110 .

[0052] The leading edge section 120 is in the form of an elliptical cylinder. This elliptical cylinder is not a standard circular cross section, but an elliptical cross section. This elliptical cross section has a specific aspect ratio, that is, the major axis of the ellipse is 1.7 to 2.5 times the minor axis. In addition, the elliptical cylinder is tangent to the opening of the first concave cavity 110, and the transition between the two is smooth and seamless, which helps to reduce resistance while improving overall stability.

[0053] In some embodiments, Figure 1 As shown, the end section 140 is a truncated cone, and the angle of the end of the truncated cone is 90 degrees to 120 degrees. The end section 140 is designed in the shape of a truncated cone, which is characterized by a gradually narrowing end. In this design, the angle of the end of the truncated cone is set between 90 degrees and 120 degrees. The selection of this angle may be based on specific functional requirements, such as facilitating insertion, reducing resistance, or improving structural stability. By adjusting the size of this angle, it is possible to facilitate the export of the airflow at the tail while meeting the front backflow functional requirements.

[0054] In summary, compared with the prior art, the advantages and beneficial effects of this embodiment are as follows: First, the flame stability is good. A horseshoe vortex is generated at the boundary layer of a conventional support plate flame stabilizer. Its three-dimensional vortex is opposite to the vortex volume of the recirculation vortex generated by the stabilizer, resulting in poor stability of the recirculation vortex and prone to combustion instability. In addition, the distance from the fuel spray to the recirculation zone is very short, and the fuel is not evaporated and mixed sufficiently, which can easily lead to unstable combustion. After parallel cross cavities are arranged on both sides of the conventional support plate flame stabilizer, a recirculation zone is formed in the cavity, which is conducive to the evaporation and mixing of the fuel; the shedding frequency of the trapped vortex behind the stabilizer is also much reduced, and the stability of the recirculation vortex is enhanced. Therefore, the flame stability is better after the parallel cross cavities are arranged.

[0055] Second, high combustion efficiency. After arranging cross-parallel concave cavities on both sides of the conventional support plate flame stabilizer, a recirculation zone is formed in the concave cavity, which is conducive to the evaporation and mixing of the fuel; the shedding frequency of the recirculation vortex behind the stabilizer is also greatly reduced, and the stability of the recirculation vortex is enhanced. Therefore, the arrangement of cross-parallel concave cavities is conducive to obtaining more stable and efficient combustion, thereby achieving higher combustion efficiency.

[0056] Third, the flow resistance loss is small. To achieve the same flame stability performance and combustion efficiency, compared with increasing the blocking width of the conventional support plate flame stabilizer, the flow resistance loss caused by arranging cross-parallel concave cavities on both sides is smaller.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame stabilizer with a support plate having parallel cross cavities, characterized in that: include: Flame stabilizing members and support plates; The flame stabilizing component is arranged on the support plate, and a first concave cavity extending perpendicularly to the airflow direction is formed in the flame stabilizing component, and a second concave cavity extending perpendicularly to the airflow direction is formed on the support plate, and the first concave cavity is connected to the second concave cavity so that the first concave cavity and / or the second concave cavity form a recirculation zone of the airflow.

2. The support plate flame stabilizer with parallel cross cavities according to claim 1, characterized in that: The flame stabilization component comprises: A leading edge section, a middle section and a terminal section connected in sequence along the airflow direction; The width of the middle section is smaller than the widths of the front edge section and the terminal section, so that both sides of the middle section cooperate with the front edge section and the terminal section to form the first concave cavity.

3. The support plate flame stabilizer with parallel cross cavities according to claim 2, characterized in that: The second concave cavities are formed on both sides of the support plate corresponding to the middle section, and the two second concave cavities are respectively connected to the corresponding first concave cavities.

4. The support plate flame stabilizer with parallel cross cavities according to claim 3, characterized in that: The angle between the side of the first cavity and / or the second cavity close to the airflow direction and its bottom surface is less than or equal to the angle between the side of the first cavity and / or the second cavity away from the airflow direction and its bottom surface.

5. The support plate flame stabilizer with parallel cross cavities according to claim 4, characterized in that: The angle between the side of the first cavity and / or the second cavity close to the airflow direction and the bottom surface thereof is 90 degrees; The angle between the first cavity and / or the second cavity away from the airflow direction and its bottom surface is 130 degrees to 150 degrees.

6. The support plate flame stabilizer with parallel cross cavities according to claim 2, characterized in that: The first concave cavity and the second concave cavity are arranged perpendicular to each other.

7. The support plate flame stabilizer with parallel cross cavities according to claim 1, characterized in that: The first cavity has a depth of 12 mm to 20 mm and a length of 18 mm to 40 mm; And / or, the second cavity has a depth of 12 mm to 20 mm and a length of 18 mm to 40 mm.

8. The support plate flame stabilizer with parallel cross cavities according to claim 1, characterized in that: The length of the support plate along the airflow direction is 90 mm to 150 mm.

9. The support plate flame stabilizer with parallel cross cavities according to any one of claims 2 to 8, characterized in that: The leading edge segment is an elliptical cylinder, the major axis of the elliptical cylinder cross section is 1.7 to 2.5 times the minor axis, and the elliptical cylinder is tangent to the opening of the first cavity.

10. The support plate flame stabilizer with parallel cross cavities according to any one of claims 2 to 8, characterized in that: The terminal section is a truncated cone, and the included angle of the terminal end of the truncated cone is 90 degrees to 120 degrees.

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