A strut flame holder with parallel intersecting cavities

Abstract

The application provides a support plate flame stabilizer with parallel cross recesses, which comprises a flame stabilizing component and a support plate; the flame stabilizing component is arranged on the support plate, the flame stabilizing component is formed with a first recess extending perpendicularly to the gas flow direction, the support plate is formed with a second recess extending perpendicularly to the gas flow direction, and the first recess and the second recess are communicated so that the first recess and / or the second recess forms a backflow area of the gas flow. The support plate flame stabilizer with parallel cross recesses provided by the application is beneficial to the evaporation and mixing of fuel oil, improves the stability of the flame, and can effectively improve the combustion efficiency. Meanwhile, compared with increasing the blockage width, the flame stabilizing component is arranged with the first recess and the support plate connected with the first recess is arranged with the second recess, and the flow resistance loss caused by the application is smaller.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation technology, and particularly relates to a strut plate flame stabilizer with parallel cross recesses. BACKGROUND

[0002] A new generation of afterburning turbofan engine pursues high thrust-to-weight ratio, and in terms of afterburner, it requires simple parts, low cold flow resistance loss, small afterburning section length ratio, and high afterburning efficiency. The afterburner uses a flame stabilizer to stabilize the flame and organize combustion, and the performance of the flame stabilizer is a decisive factor affecting the performance of the afterburner. Most new generation afterburning turbofan engines adopt an integrated afterburner designed by integrating the straightening strut plate and the flame stabilizer. However, the conventional strut plate flame stabilizer generates a horseshoe vortex, which leads to poor stability of the backflow vortex near the wall surface, and causes local unstable combustion.

[0003] Because the afterburning section length ratio is small, the distance from the fuel injection to the rear edge of the flame stabilizer is correspondingly small, and the fuel mist, evaporation and mixing are not sufficient before being ignited, which easily leads to unstable combustion. After superimposing the unstable combustion caused by the backflow vortex, the unstable combustion problem is amplified, and the combustion reaction process is affected; the distance from the rear edge of the flame stabilizer to the nozzle outlet is correspondingly small, the combustion section is shortened, the flame in the backflow area of the flame stabilizer does not have time to spread across the entire combustion chamber in the transverse direction, and part of the oil-gas mixture is not fully burned, and part of the oil-gas mixture is directly discharged without participating in the combustion, thereby seriously affecting the afterburning efficiency. SUMMARY

[0004] The present application provides a strut plate flame stabilizer with parallel cross recesses to solve the problem of poor stability of the backflow vortex near the existing flame stabilizer, which leads to local unstable combustion.

[0005] The present application provides a strut plate flame stabilizer with parallel cross recesses, comprising:

[0006] a flame stabilizing component and a strut plate;

[0007] The flame stabilizing component is arranged on the strut plate, the flame stabilizing component is formed with a first recess extending perpendicularly to the direction of airflow inflow, the strut plate is formed with a second recess extending perpendicularly to the direction of airflow inflow, and the first recess and the second recess are communicated to form a backflow area of the airflow in the first recess and / or the second recess.

[0008] According to the present application, a strut plate flame stabilizer with parallel cross recesses is provided, and the flame stabilizing component comprises:

[0009] a leading edge section, a middle section and a terminal section connected in sequence along the direction of airflow inflow;

[0010] The width of the middle section is smaller than the width of the front edge section and the end section, so that the two sides of the middle section cooperate with the front edge section and the end section to form the first concave cavity.

[0011] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the support plate corresponds to the two sides of the middle section and forms the second concave cavity, and the two second concave cavities are respectively communicated with the corresponding first concave cavities.

[0012] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the angle between the side edge of the first concave cavity and / or the second concave cavity close to the gas flow direction and the bottom surface is smaller than or equal to the angle between the side edge of the first concave cavity and / or the second concave cavity away from the gas flow direction and the bottom surface.

[0013] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the angle between the side edge of the first concave cavity and / or the second concave cavity close to the gas flow direction and the bottom surface is 90 degrees.

[0014] The angle between the side edge of the first concave cavity and / or the second concave cavity away from the gas flow direction and the bottom surface is 130-150 degrees.

[0015] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the first concave cavity and the second concave cavity are perpendicular to each other.

[0016] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the depth of the first concave cavity is 12-20 mm, and the length is 18-40 mm.

[0017] And / or, the depth of the second concave cavity is 12-20 mm, and the length is 18-40 mm.

[0018] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the length of the support plate along the gas flow direction is 90-150 mm.

[0019] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the front edge section is an elliptical cylinder, the length of the major axis of the elliptical cross section is 1.7-2.5 times the length of the minor axis, and the elliptical cylinder is tangent to the opening of the first concave cavity.

[0020] According to the present application, a support plate flame stabilizer with parallel cross concave cavities is provided, the end section is a truncated cone, and the angle at the end of the truncated cone is 90-120 degrees.

[0021] The application provides a support plate flame stabilizer with parallel cross recess cavities. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0023] Figure 1 It is a perspective view of the support plate flame stabilizer with parallel cross recess cavities.

[0024] Figure 2 It is a side view of part of the structure of the support plate flame stabilizer with parallel cross recess cavities.

[0025] Figure 3 It is a front view of the support plate flame stabilizer with parallel cross recess cavities.

[0026] Figure 4 It is a bottom view of the support plate flame stabilizer with parallel cross recess cavities.

[0027] Figure 5 It is a top view of the support plate flame stabilizer with parallel cross recess cavities.

[0028] Figure 6 It is a streamline of the support plate flame stabilizer with parallel cross recess cavities. Figure 1 .

[0029] Figure 7 It is a streamline of the support plate flame stabilizer with parallel cross recess cavities. Figure 2 .

[0030] Figure 8 It is a streamline of the support plate flame stabilizer with parallel cross recess cavities. Figure 3 .

[0031] REFERENCE SIGNS:

[0032] 10. Flame stabilizing component; 110. First cavity; 120. Leading edge section; 130. Middle section; 140. End section; 20. Support plate; 210. Second cavity. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] The following is combined with Figures 1-8 The present invention describes a plate flame stabilizer with parallel cross-cavities.

[0035] One embodiment of this application provides a flame stabilizer with a support plate and parallel cross-cavities, such as... Figures 1 to 5 As shown, the flame stabilizer with parallel intersecting cavities includes a flame stabilizing member 10 and a support plate 20. The flame stabilizing member 10 is disposed on the support plate 20, and a first cavity 110 extending perpendicularly to the airflow inflow direction is formed in the flame stabilizing member 10. A second cavity 210 extending perpendicularly to the airflow inflow direction is formed on the support plate 20. The first cavity 110 and the second cavity 210 communicate with each other, 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 recirculation zone for the airflow.

[0036] In this embodiment, the flame stabilizing member 10 is mounted on the support plate 20. A first recess 110 extending perpendicularly to the airflow direction is designed into the flame stabilizing member 10. The main function of the first recess 110 is to guide the airflow to form a recirculation zone, thereby facilitating fuel evaporation and mixing with air, thus enhancing flame stability and combustion efficiency.

[0037] Meanwhile, the support plate 20 is also designed with a second recess 210 extending perpendicularly to the airflow inflow direction. The first recess 110 and the second recess 210 are connected, allowing airflow to flow freely between them, further enhancing the formation of the recirculation zone. The second recess 210 is essentially an extension of the first recess 110 in another direction, so that the second recess 210 and the first recess 110 together form a recirculation zone, optimizing the airflow path on the support plate 20 and further improving the stability of the flame and combustion efficiency.

[0038] Compared with the traditional method of increasing the blockage width, the design of the present application causes less flow resistance loss, thereby improving the performance of the entire combustion system.

[0039] During operation, the oil-gas mixture forms a recirculation zone after passing through the first cavity 110 on the flame stabilizing member 10 and the second cavity 210 on the support plate 20. In this zone, the speed and direction of the gas flow change, generating a recirculation vortex, which helps to further promote the mixing of the 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.

[0040] The support plate flame stabilizer with parallel cross-cavities provided by the embodiment of the present application has the first cavity 110 formed in the flame stabilizing member 10 extending perpendicularly to the direction of the gas flow and the second cavity 210 formed on the support plate 20 extending perpendicularly to the direction of the gas flow. The first cavity 110 and / or the second cavity 210 form a recirculation zone of the gas flow, which is beneficial to the evaporation and mixing of the fuel, improves the stability of the flame, and effectively improves the efficiency of the combustion. Compared with increasing the blockage width, the present application causes less flow resistance loss by forming the first cavity 110 on the flame stabilizing member 10 and the second cavity 210 on the support plate 20 connected thereto.

[0041] In some embodiments, as shown in Figures 1 to 5 The flame stabilizing member 10 includes, in sequence along the direction of the gas flow, a leading edge section 120, an intermediate section 130, and a terminal section 140. The width of the intermediate section 130 is smaller than the widths of the leading edge section 120 and the terminal section 140, so that the first cavities 110 are formed on both sides of the intermediate section 130 in cooperation with the leading edge section 120 and the terminal section 140.

[0042] In the present embodiment, the leading edge section 120 is the starting part of the flame stabilizing member 10, which first meets the gas flow from the combustion chamber. The relatively large width of the leading edge section 120 provides a smooth transition area for the gas flow, which helps to reduce the turbulence and vortex of the gas flow, so that the gas flow can enter the flame stabilizing member 10 more smoothly.

[0043] The intermediate section 130 is located between the leading edge section 120 and the terminal section 140, and its width is significantly smaller than those of the leading edge section 120 and the terminal section 140, so that the first cavities 110 are formed on both sides of the intermediate section 130 (i.e., at the connection with the leading edge section 120 and the terminal section 140). Because of the converging shape of the intermediate section 130, the gas flow is accelerated, and a pressure difference is formed on both sides of the intermediate section 130. This pressure difference causes the gas flow to generate a recirculation zone when passing through the intermediate section 130,

[0044] The end section is the end part of the flame stabilizing member 10, the width of which 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 stabilizing member 10.

[0045] Correspondingly, as Figures 1 to 5 shown, the support plate 20 is formed with second cavities 210 on both sides corresponding to the middle section 130, and the two second cavities 210 are respectively communicated with the corresponding first cavities 110.

[0046] Specifically, the second cavities 210 on the support plate 20 are located at positions corresponding to both sides of the middle section 130 of the flame stabilizing member 10. This design ensures that the first cavities 110 and the second cavities 210 can be smoothly communicated to form a continuous airflow channel. Each first cavity 110 is connected with a second cavity 210 on both sides, and the airflow can flow freely between the flame stabilizing member 10 and the support plate 20 without being blocked. This connectivity helps to enhance the turbulence and vortex of the airflow, promoting the sufficient mixing of fuel and air. The shape and size of the second cavities 210 are generally matched with those of the first cavities 110 to ensure that the airflow can flow smoothly from one cavity to another, helping to reduce the energy loss of the airflow during the flow process and improve the combustion efficiency.

[0047] In some embodiments, as Figures 1 to 5 shown, the included angle between the side edge of the first cavity 110 and / or the second cavity 210 close to the airflow inflow direction and the bottom surface thereof is less than or equal to the included angle between the side edge of the first cavity 110 and / or the second cavity 210 away from the airflow inflow direction and the bottom surface thereof. The smaller included angle close to the airflow inflow direction helps to guide the airflow into the cavity to form a recirculation zone, and the larger included angle away from the airflow inflow direction helps to flow out after the recirculation vortex is formed in the cavity, reducing the flow resistance.

[0048] As Figure 3 shown, the included angle between the side edge of the first cavity 110 away from the airflow inflow direction and the bottom surface thereof is a1. As Figure 2 shown, the included angle between the side edge of the second cavity 210 away from the airflow inflow direction and the bottom surface thereof is a2. 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 first cavity 110 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.

[0049] As Figure 6 shown, Figure 6 is the streamline of the support plate flame stabilizer with parallel cross-cavities in the present application Figure 1As can be seen from the figure, stable low-speed recirculation zones are formed in both the first cavity 110 and the second cavity 210. The recirculation vortex stability at the boundary layer is good, which is conducive to achieving better flame stability performance.

[0050] Figure 7 The streamline of the support plate flame stabilizer with parallel cross-cavities in this invention. Figure 2 As can be seen from the figure, a reflux zone is formed inside the concave cavity, which is beneficial to the evaporation and mixing of fuel; the reflux zone has strong stability, which is conducive to obtaining more stable and efficient combustion.

[0051] Figure 8 The streamline of the support plate flame stabilizer with parallel cross-cavities in this invention. Figure 3 As can be seen from the figure, the concave cavity structure does not block the flow channel, and the blockage width is greatly reduced compared to conventional flame stabilizers, resulting in less flow resistance loss.

[0052] In one specific embodiment, the angle between the side of the first cavity 110 and / or the second cavity 210 closest to the airflow inflow 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 furthest from the airflow inflow direction and its bottom surface is 130 to 150 degrees.

[0053] 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 obtuse. This guides the airflow into the concave cavity to form a backflow zone. After the backflow vortex is formed in the concave cavity, the airflow flows out and can flow out from the obtuse angle side, reducing flow resistance.

[0054] In some embodiments, such as Figure 1 As shown, the first cavity 110 and the second cavity 210 are arranged perpendicular to each other.

[0055] In this embodiment, the first cavity 110 and the second cavity 210 are perpendicular to each other, and together they form a three-dimensional airflow channel, which helps to guide the airflow more effectively and form a backflow zone between the flame stabilizing member 10 and the support plate 20. This is equivalent to setting only a single cavity, which can be applied to a larger scenario and broaden the applicability of the entire mechanism.

[0056] In some embodiments, such as Figures 1 to 5 As shown, the depth of the first cavity 110 is 12mm to 20mm and the length is 18mm to 40mm, that is, the length-to-depth ratio is 1.5 to 2.0; and / or, the depth of the second cavity 210 is 12mm to 20mm and the length is 18mm to 40mm, that is, the length-to-depth ratio is 1.5 to 2.0.

[0057] The proper 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 cavities. Too shallow or too deep cavities can affect the flow effect of the airflow, while the appropriate depth can guide the airflow to form stable vortex and turbulence. The control of the length-depth ratio helps to ensure that the airflow can maintain sufficient residence time in the cavities, so as to fully mix with the fuel particles. By optimizing the size parameters of the cavities, the mixing of fuel and air can be more effectively promoted, thereby improving the 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.

[0058] As shown in Figure 2 and Figure 3 , the length of the support plate 20 in the direction of airflow inflow is 90mm to 150mm. That is, the chord length L1 of the support plate 20 is preferably 90mm to 150mm.

[0059] In some embodiments, as shown in Figure 1 , the elliptical cylinder of the leading edge section 120 has an elliptical long axis size that is 1.7 to 2.5 times the short axis size of the elliptical cross section, and the elliptical cylinder is tangent to the opening of the first cavity 110.

[0060] The leading edge section 120 presents an elliptical cylinder shape. This elliptical cylinder is not a standard circular cross section, but adopts an elliptical cross section. This elliptical cross section has a specific aspect ratio, i.e., the long axis size of the ellipse is 1.7 to 2.5 times the short axis size. In addition, the elliptical cylinder is tangent to the opening of the first cavity 110, and the transition between the two is smooth and seamless, which helps to reduce resistance while improving overall stability.

[0061] In some embodiments, as shown in Figure 1 , the tip section 140 is a truncated pyramid, and the included angle of the truncated pyramid tip is 90 degrees to 120 degrees. The tip section 140 is designed as a truncated pyramid shape, characterized by a gradually narrowing tip. In this design, the included angle of the truncated pyramid tip is set to be between 90 degrees and 120 degrees. The choice of this angle may be based on specific functional requirements, such as ease of insertion, reduced resistance, or improved structural stability, etc. By adjusting the size of this angle, the tail airflow can be easily guided out while meeting the front backflow functional requirements.

[0062] In summary, compared with the prior art, the advantages and beneficial effects of the present embodiment are:

[0063] First, the flame stability is good. The horseshoe vortex is generated at the boundary layer of the conventional strut flame stabilizer, and the three-dimensional vortex is opposite to the backflow vortex generated by the stabilizer, which leads to poor stability of the backflow vortex and unstable combustion. The fuel is sprayed into the backflow zone for a very short distance, and the fuel evaporation and mixing are insufficient, which can easily lead to unstable combustion. After arranging the parallel cross recesses on both sides of the conventional strut flame stabilizer, the backflow zone is formed in the recess, which is beneficial to the evaporation and mixing of fuel; the shedding frequency of the vortex behind the stabilizer is also reduced a lot, and the stability of the backflow vortex is enhanced. Therefore, the flame stability is better after arranging the parallel cross recesses.

[0064] Second, the combustion efficiency is high. After arranging the cross parallel recesses on both sides of the conventional strut flame stabilizer, the backflow zone is formed in the recess, which is beneficial to the evaporation and mixing of fuel; the shedding frequency of the backflow vortex behind the stabilizer is also reduced a lot, and the stability of the backflow vortex is enhanced. Therefore, arranging the cross parallel recesses is beneficial to obtain more stable and efficient combustion, so as to achieve higher combustion efficiency.

[0065] Third, the flow resistance loss is small. To achieve the same flame stability and combustion efficiency, compared with increasing the blockage width of the conventional strut flame stabilizer, arranging the cross parallel recesses on both sides causes smaller flow resistance loss.

[0066] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A flame stabilizer with a support plate and parallel cross-cavities, characterized in that, include: Flame stabilizing components and support plates; The flame stabilizing member is disposed on the support plate. A first cavity extending perpendicularly to the airflow inflow direction is formed in the flame stabilizing member. A second cavity extending perpendicularly to the airflow inflow direction is formed on the support plate. The first cavity and the second cavity are connected so that the first cavity and / or the second cavity form an airflow recirculation zone.

2. The flame stabilizer with parallel cross-cavities according to claim 1, characterized in that, The flame stabilizing component includes: The leading edge section, the middle section, and the terminal section are connected sequentially along the direction of airflow inflow; The width of the middle section is smaller than the width of the leading edge section and the ending section, so that both sides of the middle section cooperate with the leading edge section and the ending section to form the first concave cavity.

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

4. The 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 closest to the airflow inflow 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 furthest from the airflow inflow direction and its bottom surface.

5. The flame stabilizer with parallel intersecting cavities according to claim 4, characterized in that, The angle between the side of the first cavity and / or the second cavity near the airflow inflow direction and its bottom surface is 90 degrees. The angle between the side of the first cavity and / or the second cavity away from the airflow inflow direction and its bottom surface is 130 to 150 degrees.

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

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

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

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

10. The flame stabilizer with parallel cross-cavities according to any one of claims 2-8, characterized in that, The distal segment is a vertebral section, and the included angle of the distal end of the vertebral section is 90 degrees to 120 degrees.

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