A variable flame stabilizer with pneumatic atomization function

Abstract

The present invention discloses a variable flame stabilizer with a pneumatic atomization function, which relates to the technical field of flame stabilizers and comprises a stabilizer plate, an elliptical cylinder and an oil injection pipe; the two stabilizer plates are rotatably connected in a V shape, and the opposite surfaces of the two stabilizer plates are in contact with the outer wall of the elliptical cylinder. The two stabilizer plates are provided with an aerodynamic atomization groove on one side away from their own rotation connection, and the aerodynamic atomization groove passes through the stabilizer plate; a fuel injection hole is provided on the outer surface of the elliptical cylinder adjacent to the aerodynamic atomization groove, and the fuel injection hole is communicated with the space enclosed inside the elliptical cylinder; the oil injection pipe penetrates into the elliptical cylinder, and the outer wall of the oil injection pipe is connected to the inner wall of the elliptical cylinder. The oil injection pipe is used to drive the elliptical cylinder to rotate so as to change the opening angle of the two stabilizer plates; thereby effectively solving the problem of complex structure of the existing deformable flame stabilizer.

Description

Technical Field

[0001] The present invention relates to the technical field of flame stabilizers, in particular to a variable flame stabilizer with a pneumatic atomization function. Background Art

[0002] The operating mode of the afterburner of an aircraft engine is of great significance to key combat capabilities such as aircraft takeoff, interception, pursuit and escape. Advanced afterburners have more diverse operating modes and a wider range of operating conditions, making it more difficult to organize stable combustion, and thus placing higher demands on the flame stabilization device. Stable ignition in the afterburner usually uses a flame stabilizer to construct a low-speed recirculation zone to achieve oil and gas mixing, stable ignition and flame stabilization. How to achieve reliable ignition and flame stabilization of the flame stabilizer while minimizing flow resistance loss is a difficult problem. Most afterburners in current aircraft engines use a simple V-shaped flame stabilizer to form a recirculation vortex at the trailing edge of the stabilizer, which entrains air outside the recirculation zone to stabilize the combustion process. However, while the V-shaped stabilizer achieves ignition and flame stabilization, it also introduces additional resistance to the flow, resulting in a large total pressure loss.

[0003] An ideal flameholder combines reliable ignition, stable flames, high efficiency, and low drag. It forms a stable recirculation ignition zone when the afterburner is operating, creating flow and oil mist conditions conducive to ignition and flame stability, while minimizing flow losses when the afterburner is not operating. Fixed-geometry flameholders have a limited range of applicable operating conditions, particularly when the afterburner is not operating. The resulting flow resistance losses are useless and impact the engine's propulsion performance. Existing variable-geometry flameholders, however, are complex and their drive structures affect the flow field in the active ignition zone. They cannot fully meet the requirements for reliable ignition, flame stability, and high efficiency and low drag combustion in advanced afterburners.

[0004] Therefore, studying a deformable flame stabilizer with a simple structure has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The object of the present invention is to provide a variable flame stabilizer with a pneumatic atomization function to solve the problem of complex structure of existing deformable flame stabilizers.

[0006] In order to solve the above technical problems, the present invention provides a variable flame stabilizer with a pneumatic atomization function, including a stabilizer plate, an elliptical cylinder and a fuel injection pipe; the two stabilizer plates are rotatably connected in a V shape, and the opposite surfaces of the two stabilizer plates are in contact with the outer wall of the elliptical cylinder. The two stabilizer plates are provided with a pneumatic atomization groove on the side away from their own rotation connection, and the pneumatic atomization groove passes through the stabilizer plate; the elliptical cylinder is provided with a fuel injection hole on the outer surface adjacent to the pneumatic atomization groove, and the fuel injection hole is connected to the space enclosed inside the elliptical cylinder; the fuel injection pipe penetrates into the elliptical cylinder, and the outer wall of the fuel injection pipe is connected to the inner wall of the elliptical cylinder. The fuel injection pipe is used to drive the elliptical cylinder to rotate to change the opening angle of the two stabilizer plates.

[0007] In one embodiment, a plurality of the fuel injection holes are provided on opposite sides of the elliptical cylinder, and the plurality of the fuel injection holes on opposite sides of the elliptical cylinder are arranged and extended along the axial direction of the elliptical cylinder.

[0008] In one embodiment, a plurality of the pneumatic atomization slots are provided on the stabilizer plate, the plurality of the pneumatic atomization slots are arranged adjacent to an edge of the stabilizer plate, and the plurality of the pneumatic atomization slots are arranged extending along the edge of the stabilizer plate.

[0009] In one embodiment, the pneumatic atomization slot is in a strip shape, and the length extension direction of the pneumatic atomization slot is consistent with the axial direction of the elliptical cylinder.

[0010] In one embodiment, a positioning column is connected between the outer wall of the fuel injection pipe and the inner wall of the elliptical cylinder.

[0011] In one embodiment, one end of the fuel injection pipe extends outside the elliptical cylinder, and the fuel injection pipe is provided with a coaxially arranged gear outside the elliptical cylinder.

[0012] In one embodiment, the elliptical cylinder is completely connected between the two ends.

[0013] The beneficial effects of the present invention are as follows:

[0014] (1) The structure is simple and variable, reducing flow resistance loss. Based on the rotation of the elliptical cylinder, the opening angle of the two stabilizer plates can be changed, the blockage ratio of the flame stabilizer can be adjusted, and the flow resistance loss of the afterburner in the non-afterburner state can be reduced.

[0015] (2) Enhance fuel atomization and oil mist mixing. When the fuel is sprayed onto the inner side of the stabilizer plate, part of it adheres to the stabilizer plate to form a liquid film, while part of it forms clumps and flocs after impact, effectively enhancing the primary atomization of the fuel. The design of the pneumatic atomization slot allows the airflow to directly impact the fuel after introduction, breaking the liquid film. The induced airflow forms a directional vortex at the trailing edge of the stabilizer, enhancing the secondary atomization of the large fuel droplets entrained there, and also facilitating the multi-directional diffusion of the fuel.

[0016] (3) Dual cooling of gas and liquid to avoid local high-temperature ablation. When the afterburner is turned on, the fuel is sprayed to the inside of the stabilizer plate, forming a liquid film that then breaks and evaporates, taking away the energy inside the stabilizer plate and preventing heat accumulation; and the pneumatic atomization groove guides the air through the inside of the stabilizer plate, forming an air film cooling while effectively isolating the heat radiation of the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the maximum opening angle structure provided by an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure viewed from above;

[0020] Figure 3 This is a schematic diagram of the minimum opening angle structure provided by an embodiment of the present invention;

[0021] Figure 4 yes Figure 3 Schematic diagram of the structure viewed from above;

[0022] Figure 5 It is the total pressure recovery coefficient diagram of a certain parameter V-type stabilizer in the open and closed states at different incoming flow velocities;

[0023] Figure 6 This is the velocity streamline diagram of the radial center section of the variable structure flame stabilizer with aerodynamic atomization groove;

[0024] Figure 7 This is the velocity streamline diagram of the radial center section of the variable structure flame stabilizer without aerodynamic atomization groove;

[0025] Figure 8 This is the contour map of turbulent kinetic energy in the radial center section of a variable structure flame stabilizer with aerodynamic atomization slots;

[0026] Figure 9 This is the contour map of turbulent kinetic energy in the radial center section of the variable structure flame stabilizer without aerodynamic atomization groove;

[0027] Figure 10 This is the contour map of turbulent kinetic energy in the radial center section of a variable structure flame stabilizer with aerodynamic atomization slots;

[0028] Figure 11It is the contour map of turbulent kinetic energy in the radial center section of a variable structure flame stabilizer with aerodynamic atomization grooves.

[0029] The reference numerals are as follows:

[0030] 10. Stabilizer plate; 11. Pneumatic atomization tank;

[0031] 20. Oval cylinder; 21. Fuel injection hole;

[0032] 30. Fuel injection pipe; 31. Gear;

[0033] 40. Positioning column. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] The present invention provides a variable flame stabilizer with pneumatic atomization function, which is implemented as follows: Figures 1 to 4 As shown, it includes a stabilizer plate 10, an elliptical cylinder 20 and a fuel injection pipe 30; the two stabilizer plates 10 are rotatably connected in a V shape, and the opposite surfaces of the two stabilizer plates 10 are in contact with the outer wall of the elliptical cylinder 20. The two stabilizer plates 10 are provided with a pneumatic atomization groove 11 on the side away from their own rotational connection, and the pneumatic atomization groove 11 passes through the stabilizer plate 10; the elliptical cylinder 20 is provided with a fuel injection hole 21 on the outer surface adjacent to the pneumatic atomization groove 11, and the fuel injection hole 21 is connected to the space enclosed inside the elliptical cylinder 20; the fuel injection pipe 30 penetrates into the elliptical cylinder 20, and the outer wall of the fuel injection pipe 30 is connected to the inner wall of the elliptical cylinder 20. The fuel injection pipe 30 is used to drive the elliptical cylinder 20 to rotate to change the opening angle of the two stabilizer plates 10.

[0036] like Figure 1 and Figure 2 As shown, at this time, the two ends of the elliptical cylinder 20 in the long axis direction abut against the inner surfaces of the two stabilizer plates 10, so that the two stabilizer plates 10 are in the state of maximum opening angle; if it is necessary to reduce the opening angle between the two stabilizer plates 10, it is only necessary to use the injection pipe 30 to drive the elliptical cylinder 20 to rotate, for example Figure 3 and Figure 4 As shown in , at this time, the elliptical cylinder 20 has rotated to the point where both ends of its short axis are in contact with the inner surfaces of the two stabilizer plates 10, so that the two stabilizer plates 10 are at a minimized opening angle; the entire adjustment structure is simple and reasonable, thereby effectively solving the problem of complex structure of existing deformable flame stabilizers.

[0037] That is, this embodiment has at least the following beneficial effects:

[0038] (1) The structure is simple and variable, reducing flow resistance losses. Based on the rotation of the elliptical cylinder 20, the opening angle of the two stabilizer plates 10 can be changed, the blockage ratio of the flame stabilizer can be adjusted, and the flow resistance losses of the afterburner in the non-afterburner state can be reduced.

[0039] (2) Enhance fuel atomization and oil mist mixing. When the fuel is sprayed onto the inner side of the stabilizer plate 10, part of it adheres to the stabilizer plate 10 to form a liquid film, while part of it forms clumps or flocs after impact, effectively enhancing the primary atomization of the fuel. The design of the pneumatic atomization groove 11 allows the airflow to directly impact the fuel after introduction, breaking up the liquid film. The induced airflow also forms a directional vortex at the trailing edge of the stabilizer, enhancing the secondary atomization of the large fuel droplets entrained there, and also facilitating the multi-directional diffusion of the fuel.

[0040] (3) Dual cooling of gas and liquid to avoid local high-temperature ablation. When the afterburner is turned on, the fuel is sprayed onto the inner side of the stabilizer plate 10, forming a liquid film that then breaks and evaporates, taking away the internal energy of the stabilizer plate 10 and preventing heat accumulation; and the pneumatic atomization groove 11 guides the air through the inner side of the stabilizer plate 10, forming an air film cooling while effectively isolating the heat radiation of the flame.

[0041] like Figure 1 As shown, in this embodiment, a plurality of fuel injection holes 21 are preferably provided on opposite sides of the elliptical cylinder 20 , and the plurality of fuel injection holes 21 on opposite sides of the elliptical cylinder 20 are arranged and extended along the axial direction of the elliptical cylinder 20 .

[0042] After adopting this setting, even if one side of the elliptical cylinder 20 abuts against the stabilizer plate 10, the other side of the elliptical cylinder 20 will inevitably be separated from the stabilizer plate 10, thereby preventing all fuel injection holes 21 from being blocked, providing an important guarantee for the normal operation of the fuel injection holes 21 at all times.

[0043] like Figure 1 As shown, in this embodiment, a plurality of pneumatic atomization slots 11 are preferably provided on the stabilizer plate 10 , and the plurality of pneumatic atomization slots 11 are arranged adjacent to the edge of the stabilizer plate 10 , and the plurality of pneumatic atomization slots 11 are arranged along the edge of the stabilizer plate 10 .

[0044] After adopting this arrangement, the arrangement position of the pneumatic atomization slot 11 can be made more reasonable, thereby obtaining a better atomization effect.

[0045] like Figure 1 As shown, in this embodiment, the pneumatic atomization slot 11 is preferably arranged in a strip shape, and the length extension direction of the pneumatic atomization slot 11 is consistent with the axial direction of the elliptical cylinder 20 .

[0046] After adopting this configuration, the configuration shape of the pneumatic atomization slot 11 can be made more reasonable, thereby achieving a better atomization effect.

[0047] like Figure 2 and Figure 4 As shown, in this embodiment, a positioning column 40 is preferably provided between the outer wall of the oil injection pipe 30 and the inner wall of the elliptical cylinder 20 .

[0048] After adopting this arrangement, the positioning column 40 can be used to achieve the connection and fixation between the oil injection pipe 30 and the elliptical cylinder 20, thereby ensuring that the two can rotate smoothly and synchronously.

[0049] like Figure 1 and Figure 3 As shown, in this embodiment, one end of the fuel injection pipe 30 is preferably extended to the outside of the elliptical cylinder 20 , and the fuel injection pipe 30 is provided with a coaxially arranged gear 31 outside the elliptical cylinder 20 .

[0050] After adopting this setting mode, the motor can be used to drive the gear set to engage with the gear 31 on the oil injection pipe 30, thereby facilitating the rotation control of the elliptical cylinder 20.

[0051] like Figure 2 and Figure 4 As shown, in this embodiment, it is preferred to completely penetrate between the two ends of the elliptical cylinder 20.

[0052] This embodiment mainly studies the application of the above-mentioned flame stabilizer in the afterburner. In the afterburner state, the flame stabilizer is opened to form a low-speed recirculation zone downstream, thereby enhancing the fuel atomization and mixing, and achieving flame stabilization in the afterburner. In the non-afterburner state, the opening angle is adjusted to the minimum to reduce useless flow resistance loss and improve engine operating efficiency.

[0053] 1. To verify the performance of the flame stabilizer, a numerical simulation of the flow field is performed in a binary model, such as Figure 2 and Figure 4 The figure shows the flame stabilizer in two states: fully open and fully closed. The minimum opening angle α2 of the model is 15°, corresponding to a blockage ratio of 0.2, and the maximum opening angle α1 is 30°, corresponding to a blockage ratio of 0.4.

[0054] 2. Total pressure recovery coefficient under different flow velocities in the open and closed states

[0055] like Figure 5 As shown in the figure, in the two states of open (blocking ratio 0.4) and closed (blocking ratio 0.2), as the incoming flow velocity increases, the total pressure recovery coefficient in the open state decreases significantly and the flow loss increases. It can be seen that in the non-afterburner state, especially in the case of high-speed incoming flow, reducing the opening angle by using the flame stabilizer can greatly reduce the flow loss.

[0056] 3. Velocity streamline diagram of the flow field with and without pneumatic atomization slot 11

[0057] like Figure 6 、 Figure 7Shown are velocity streamlines at the radial center of the stabilizer with and without the pneumatic atomizer 11. Comparing the velocity streamlines for the two configurations, it can be seen that the stabilizer with the pneumatic atomizer 11 draws air behind the atomizer. One side of the stabilizer laterally intersects and merges with the low-speed recirculation zone, strengthening the recirculation vortex structure. This improves the relative stability of the recirculation vortex and expands the working range of the duty ignition zone. On the other side, a small vortex structure intersects with the recirculation vortex, enhancing oil-gas mixing.

[0058] 4. Distribution of turbulent kinetic energy contour lines with and without pneumatic atomization slot 11

[0059] like Figure 8 、 Figure 9 As shown in the figure, the turbulent kinetic energy contours at the radial center cross-section of the structure with and without the aerodynamic atomization groove 11 are plotted. Comparing the turbulent kinetic energy contours at the sidewall behind the fuel injection hole 21 in the two figures, it can be seen that the flame stabilizer with the aerodynamic atomization groove 11 has greater turbulent kinetic energy at the sidewall liquid film formation location. The aerodynamic shear force of the airflow is conducive to the atomization of the fuel. Before the downstream recirculation zone, a significant high turbulence area can be seen in the turbulent kinetic energy diagram of the stabilizer with the aerodynamic atomization groove 11 structure. This is caused by the small vortex generated by the intersection of the air intake of the aerodynamic atomization groove 11 and the Karman recirculation vortex at this location. The oil and gas initially atomized by the aerodynamic shear force of the atomization groove are strongly mixed in this small vortex, resulting in secondary atomization and fragmentation, providing better oil mist conditions for stable ignition.

[0060] 5. Oil mist distribution contour map with or without pneumatic atomization tank 11 structure

[0061] like Figure 10 、 Figure 11 As shown, the oil mist distribution of the structure with and without the pneumatic atomizer 11 is shown. Comparing the oil mist distribution under the two structures, the molar mass fraction of the oil mist distribution of the structure without the atomizer 11 spans nearly 0.4 in the recirculation area, while the span of the oil mist distribution in the recirculation area of ​​the structure with the pneumatic atomizer 11 is 0.1. The oil mist distribution of the stabilizer with the pneumatic atomizer 11 is more uniform.

[0062] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A variable flame stabilizer with pneumatic atomization function, characterized in that: including stabilizer plates, elliptical cylinders and fuel injection pipes; The two stabilizer plates are rotatably connected in a V-shape, and the opposing surfaces of the two stabilizer plates are in contact with the outer wall of the elliptical cylinder. A pneumatic atomization groove is provided on one side of the two stabilizer plates away from the rotational connection, and the pneumatic atomization groove passes through the stabilizer plates. The elliptical cylinder is provided with a fuel injection hole on the outer surface adjacent to the pneumatic atomizing groove, and the fuel injection hole is communicated with the space enclosed inside the elliptical cylinder; The fuel injection pipe penetrates into the elliptical cylinder, and the outer wall of the fuel injection pipe is connected to the inner wall of the elliptical cylinder. The fuel injection pipe is used to drive the elliptical cylinder to rotate to change the opening angle of the two stabilizer plates.

2. The variable flame stabilizer according to claim 1, characterized in that: A plurality of the fuel injection holes are provided on opposite sides of the elliptical cylinder, and the plurality of the fuel injection holes on opposite sides of the elliptical cylinder are arranged and extended along the axial direction of the elliptical cylinder.

3. The variable flame stabilizer according to claim 1, characterized in that: A plurality of the pneumatic atomization slots are provided on the stabilizer plate. The plurality of the pneumatic atomization slots are arranged adjacent to the edge of the stabilizer plate, and the plurality of the pneumatic atomization slots are arranged and extended along the edge of the stabilizer plate.

4. The variable flame stabilizer according to claim 1, characterized in that: The pneumatic atomization slot is in a strip shape, and the length extension direction of the pneumatic atomization slot is consistent with the axial direction of the elliptical cylinder.

5. The variable flame stabilizer according to claim 1, characterized in that: A positioning column is connected between the outer wall of the oil injection pipe and the inner wall of the elliptical cylinder.

6. The variable flame stabilizer according to claim 1, characterized in that: One end of the oil injection pipe extends outside the elliptical cylinder, and the oil injection pipe is provided with a coaxially arranged gear outside the elliptical cylinder.

7. The variable flame stabilizer according to claim 1, characterized in that: The two ends of the elliptical column are completely penetrated.

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