Adjustable mixing stabilizer structure, control method and applied afterburner

Abstract

The invention relates to the technical field of aero-engines, and discloses an adjustable mixing stabilizer structure, a control method and an applied afterburner. The adjustable mixing stabilizer structure comprises a stabilizer main body, an air entraining cover plate and a first driving mechanism; when the duct is large, the first driving mechanism is controlled to drive the air entraining cover plate to rotate along the hinge shaft, so that the throttling area of the mixing channel is increased, the flow of cooling air passing through the mixing channel is increased, the flow of the cooling air of the heat insulation screen is reduced, the content of oxygen in the duct is increased, and the combustion efficiency of the afterburner is improved; when the duct is small, the first driving mechanism is controlled to drive the air entraining cover plate to rotate along the hinge shaft so as to reduce the throttling area of the mixing channel, so that the flow of cooling air passing through the mixing channel is reduced, the flow of cooling air of the heat screen is increased, the flow of cooling air is guaranteed, and it is guaranteed that the relative cold air amount entering the heat screen is within a stable and controllable range; and safe operation requirements of the afterburner are met.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and discloses an afterburner with an adjustable mixing stabilizer structure, control method, and application. Background Technology

[0002] Variable cycle engines offer significant advantages in overall performance during mixed supersonic and subsonic flight missions. During climb, acceleration, and supersonic flight, the bypass ratio is reduced to make the engine's performance approach that of a turbojet engine, thereby increasing thrust. During takeoff and subsonic flight, the bypass ratio is increased to operate like a turbofan engine, thereby reducing fuel consumption and noise.

[0003] There are numerous aerodynamic adjustable mixing stabilizer structures on variable cycle engines. The adjustable mixing stabilizer structure involved in the afterburner is mainly used to adjust the bypass air to redistribute the cooling airflow and mixed combustion. When the engine bypass ratio changes and exceeds the design bypass ratio, the adjustment device is opened to allow some bypass air to enter the inner chamber through the adjustment device, reducing the relative amount of cooling air entering the cooling channel. However, the throttling area entering the heat shield cooling channel remains unchanged, and the absolute cooling intake air volume is increasing. When the cooling air volume exceeds the cooling air consumption, it causes excess cooling air, reducing the combustion efficiency of the afterburner and leading to an increase in the fuel consumption rate of the aero engine. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable blending stabilizer structure, control method and application for an afterburner, which can ensure that the relative amount of cold air entering the heat shield is within a stable and controllable range, thus meeting the requirements for safe operation of the afterburner.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows: An adjustable mixing stabilizer structure includes: The stabilizer body has a V-shaped structure, which is radially disposed in the inner channel between the flow divider ring and the inner cone of the afterburner; the V-shaped structure includes a first support plate and a second support plate arranged radially along the afterburner. An air venting cover is movably mounted on a hinged shaft at the conical position of a V-shaped structure. The first driving mechanism is used to drive the air intake cover to rotate along the hinge axis at the conical part of the V-shaped structure, so as to adjust the flow area of ​​the mixing channel on the flow divider ring through the air intake cover.

[0006] Furthermore, the first support plate and the second support plate are hinged at the conical part of the V-shaped structure.

[0007] Furthermore, the air venting cover is fixed to the outer end face of the first support plate or the second support plate.

[0008] Furthermore, it also includes a second drive structure, which is used to drive the first and second support plates of the V-shaped structure to rotate around the hinge axis at the cone position of the V-shaped structure.

[0009] Furthermore, the mixing channel is a fan-shaped structure, and the air intake cover is also a fan-shaped structure, with the apex of the fan-shaped structure of the mixing channel and the air intake cover located on the center line of the hinge axis at the cone position of the V-shaped structure.

[0010] To achieve the above technical effects, the present invention also provides a control method for an adjustable blending stabilizer structure, the method being based on the aforementioned adjustable blending stabilizer structure, comprising: When the bypass ratio of the afterburner is greater than the first threshold, the first drive mechanism drives the bleed air cover to rotate, so as to increase the flow area of ​​the mixing channel and increase the cooling air flow rate through the mixing channel. When the bypass ratio is less than the second threshold, the drive mechanism drives the air intake cover to rotate, reducing the flow area of ​​the mixing channel and reducing the cooling gas flow rate through the mixing channel.

[0011] Furthermore, the first support plate and the second support plate are hinged at the conical part of the V-shaped structure. When the flow loss in the inner channel is greater than the third threshold, the first support plate or the second support plate is rotated by the second drive mechanism to reduce the included angle of the V-shaped structure.

[0012] To achieve the above-mentioned technical effects, the present invention also provides an afterburner, wherein the afterburner has the aforementioned adjustable mixing stabilizer structure.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can realize the active control of the throttling area (flow area of ​​the vent) of the cooling channel of the integrated afterburner heat shield, and realize the active control of the cooling air flow and mixed air flow in the bypass airflow, ensuring that the cooling air flow entering the heat shield is within a stable and controllable range when the bypass ratio is small, thus ensuring the reliability of the cooling design. At the same time, it increases the mixed air flow when the bypass ratio is large, thereby improving the combustion efficiency of the afterburner. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the afterburner structure containing an adjustable mixing stabilizer in the embodiment; Figure 2 This is a schematic diagram showing the fit between the first support plate, the second support plate, and the air venting cover in the embodiment. Among them, 1. Air intake cover plate; 2. Stabilizer body; 201. First support plate; 202. Second support plate; 3. First-stage tie rod; 4. Second-stage tie rod; 5. Diverter ring; 6. Heat insulation screen; 7. Inner channel; 8. Outer channel; 9. Inner cone; 10. Mixing channel; 11. Hinge shaft. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0016] Example 1 See Figures 1 to 2 An adjustable mixing stabilizer structure includes: The stabilizer body 2 has a V-shaped structure, which is radially disposed in the inner channel 7 between the flow divider ring 5 and the inner cone 9 of the afterburner; the V-shaped structure includes a first support plate 201 and a second support plate 202 arranged radially along the afterburner. Air venting cover 1, which is movably mounted on hinge shaft 11 at the conical position of the V-shaped structure; The first driving mechanism is used to drive the air intake cover 1 to rotate along the hinge shaft 11 at the position of the V-shaped structure cone, so as to adjust the flow area of ​​the mixing channel 10 on the diversion ring 5 through the air intake cover 1.

[0017] In this embodiment, when the duct size is large, the first drive mechanism is controlled to drive the bleed air cover 1 to rotate along the hinge shaft 11, thereby increasing the throttling area of ​​the mixing channel 10, increasing the cooling gas flow rate through the mixing channel 10, and reducing the cooling gas flow rate of the heat insulation screen 6, thus increasing the oxygen content and improving the combustion efficiency of the afterburner. When the duct size is small, the first drive mechanism is controlled to drive the bleed air cover 1 to rotate along the hinge shaft 11, thereby reducing the throttling area of ​​the mixing channel 10, reducing the cooling gas flow rate through the mixing channel 10, and increasing the cooling gas flow rate of the heat insulation screen 6, ensuring the cooling gas flow rate and ensuring that the relative amount of cold air entering the heat insulation screen 6 is within a stable and controllable range, meeting the safe operation requirements of the afterburner.

[0018] In this embodiment, the first support plate 201 and the second support plate 202 are hinged at the V-shaped conical part, so that the first support plate 201 and the second support plate 202 can flexibly and independently change their respective deflection angles according to different working conditions, thereby precisely adjusting the distribution and flow state of the airflow in the afterburner, thereby further optimizing the combustion process in the afterburner and improving combustion efficiency.

[0019] In this embodiment, the bleed cover 1 is fixed to the outer end face of the first support plate 201 or the second support plate 202. While changing the mixing ratio of cooling gas and high-temperature gas, the integrated design of the stabilizer and mixing mechanism can adjust the blockage ratio of the inner channel 7, effectively reducing flow loss. For example, under the condition of a large bypass ratio inflow, the bleed cover 1 is fully opened by the first drive mechanism, the mixing ratio of cold and hot airflow in the inner and outer bypass channels 8 increases, and the opening of the adjustable stabilizer moves to the minimum with the bleed cover 1, the blockage ratio of the inner channel is minimized, and the flow loss of the airflow reaches the design minimum value; when the inflow bypass ratio is small, the first drive mechanism closes the bleed cover 1 to reduce the mixing ratio of cold and hot airflow.

[0020] In this embodiment, the mixing channel 10 has a fan-shaped structure, and the air intake cover 1 also has a fan-shaped structure. The vertices of the fan-shaped structures of both the mixing channel 10 and the air intake cover 1 are located on the center line of the hinge axis 11 at the V-shaped conical part of the structure. This ensures that the air intake cover 1 maintains a precise relative position with the mixing channel 10 during opening and closing, thereby effectively controlling the mixing process of hot and cold airflows. When the air intake cover 1 is opened, a specific opening is formed between its fan-shaped edge and the fan-shaped edge of the mixing channel 10, allowing different proportions of hot and cold airflows to pass through, thereby adjusting the temperature distribution and combustion efficiency within the afterburner.

[0021] In some other embodiments, the adjustable mixing stabilizer structure also includes a second drive structure for driving the first support plate 201 and the second support plate 202 of the V-shaped structure to rotate around the hinge shaft 11 at the cone position of the V-shaped structure. The second drive structure can control the rotation angle of the first support plate 201 and the second support plate 202 according to actual working needs. For example, when it is necessary to adjust the airflow distribution to adapt to different flight conditions or combustion requirements, the second drive structure can respond quickly and drive the first support plate 201 and the second support plate 202 to rotate accordingly. At this time, there is no need to link with the bleed air cover 1, thereby realizing the fine control of the combustion process.

[0022] Based on the same inventive concept, this embodiment also provides a control method for an adjustable blending stabilizer structure, the method being based on the aforementioned adjustable blending stabilizer structure, including: When the bypass ratio of the afterburner is greater than the first threshold, the first drive mechanism drives the bleed air cover 1 to rotate, so as to increase the flow area of ​​the mixing channel 10 and increase the cooling gas flow rate through the mixing channel 10. When the bypass ratio is less than the second threshold, the drive mechanism drives the air intake cover 1 to rotate, reducing the flow area of ​​the mixing channel 10 and reducing the cooling gas flow rate through the mixing channel 10.

[0023] In this embodiment, the first support plate 201 and the second support plate 202 are hinged at the conical part of the V-shaped structure. When the flow loss of the inner channel 7 is greater than the third threshold, the second driving mechanism is used to drive the first support plate 201 or the second support plate 202 to rotate, so as to reduce the included angle of the V-shaped structure.

[0024] Example 2 See Figures 1 to 2 An afterburner has the adjustable mixing stabilizer structure described above. The adjustable mixing stabilizer structure is installed in the inner duct 7 of the afterburner, through which high-temperature gas flows and the outer duct 8 through which cooling gas flows.

[0025] The adjustable mixing stabilizer structure adjusts the mixing ratio of cold air and high-temperature gas according to the ratio of the inner and outer ducts 7, and delivers it to the combustion zone set in the afterburner for combustion. At the same time, the blockage ratio of the inner duct 7 is changed by changing the angle of the stabilizer, thereby reducing airflow loss.

[0026] The afterburner in this embodiment also includes a flow divider ring 5, an inner cone 9, a mixing channel 10, and a hinge shaft 11. The mixing channel 10 is located on the surface of the flow divider ring 5 and is a large fan-shaped area through which the cold air from the outer bypass 8 can pass through the small fan-shaped areas on both sides.

[0027] The adjustable mixing stabilizer structure includes a primary tie rod 3, a secondary tie rod 4, an air venting cover 1, and a stabilizer body 2. The primary tie rod 3 and the secondary tie rod 4 are connected, the secondary tie rod 4 is fixed to the air venting cover 1, and the stabilizer body 2 is fixed to the air venting cover 1. The transmission device (i.e., the first drive mechanism) is fixed to the surface of the flow divider ring 5. The linear displacement of the transmission device is converted into the angular displacement of the bleed air cover 1 via the first-stage tie rod 3 and the second-stage tie rod 4. By adjusting the opening of the bleed air cover 1, the flow rate of the cooling gas entering the inner duct 7 is changed, thereby altering the mixing ratio of the high-temperature gas and the cooling gas. In this embodiment, the specific control logic is as follows: When the cold air flow rate of the outer bypass duct 8 is too large, the transmission device drives the bleed air cover plate 1 to rotate in the direction of the incoming flow, forming a mixed air flow path to assist combustion; at the same time, the stabilizer body 2 moves together with the bleed air cover plate 1, the included angle of the stabilizer body 2 decreases, the blockage ratio of the inner bypass duct 7 decreases, and the airflow loss decreases. When the cold air flow rate of the outer bypass duct 8 is within the preset range, the transmission device drives the air intake cover 1 to rotate in the opposite direction of the flow. The opening of the air intake cover 1 decreases, the throttling area of ​​the mixing channel 10 decreases, and the flow rate of the cooling air entering the inner bypass duct 7 decreases, forming a sealed area for the cold air and ensuring cooling.

[0028] Working principle When the duct is relatively large, the transmission device drives the bleed air cover 1 to move to the same side, increasing the throttling area of ​​the mixing channel 10, increasing the cooling air flow through the mixing channel 10, and reducing the cooling air flow through the heat insulation screen 6. This ensures that the relative amount of cold air entering the heat insulation screen 6 is within a stable and controllable range, ensuring the reliability of the cooling design, increasing the oxygen content in the inner chamber, and improving the combustion efficiency of the afterburner. At the same time, the transmission device reduces the included angle of the stabilizer body 2, reduces the blockage ratio of the inner duct 7, and reduces the flow loss in the afterburner.

[0029] When the duct is relatively small, the transmission device drives the air intake cover 1 to move to both sides, reducing the throttling area of ​​the mixing channel 10, reducing the cooling gas flow rate through the mixing channel 10, increasing the cooling gas flow rate of the heat insulation screen 6, ensuring the cooling gas flow rate, and meeting the safe operation requirements of the afterburner.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adjustable mixing stabilizer structure, characterized in that, include: The stabilizer body (2) has a V-shaped structure and is radially disposed in the inner channel (7) between the flow divider ring (5) and the inner cone (9) of the afterburner; the V-shaped structure includes a first support plate (201) and a second support plate (202) arranged radially along the afterburner. Air intake cover (1), which is movably mounted on the hinge shaft (11) at the cone position of the V-shaped structure; The first driving mechanism is used to drive the air intake cover (1) to rotate along the hinge shaft (11) at the V-shaped structure cone position, so as to adjust the flow area of ​​the mixing channel (10) on the diversion ring (5) through the air intake cover (1).

2. The adjustable blending stabilizer structure according to claim 1, characterized in that, The first support plate (201) and the second support plate (202) are hinged at the conical part of the V-shaped structure.

3. The adjustable blending stabilizer structure according to claim 2, characterized in that, The air intake cover (1) is fixed to the outer end face of the first support plate (201) or the second support plate (202).

4. The adjustable blending stabilizer structure according to claim 2, characterized in that, It also includes a second drive structure, which is used to drive the first support plate (201) and the second support plate (202) of the V-shaped structure to rotate around the hinge shaft (11) at the cone position of the V-shaped structure.

5. The adjustable blending stabilizer structure according to claim 1, characterized in that, The mixing channel (10) has a fan-shaped structure, and the air duct cover (1) also has a fan-shaped structure. The apex of the fan-shaped structure of the mixing channel (10) and the air duct cover (1) are both located on the center line of the hinge axis (11) at the cone position of the V-shaped structure.

6. A control method for an adjustable blending stabilizer structure, the method being based on the adjustable blending stabilizer structure according to any one of claims 1-5, characterized in that, include: When the bypass ratio of the afterburner is greater than the first threshold, the first drive mechanism drives the bleed air cover (1) to rotate, so as to increase the flow area of ​​the mixing channel (10) and increase the cooling gas flow rate through the mixing channel (10). When the bypass ratio is less than the second threshold, the drive mechanism drives the air intake cover (1) to rotate, reducing the flow area of ​​the mixing channel (10) and reducing the cooling gas flow rate through the mixing channel (10).

7. The control method for the adjustable blending stabilizer structure according to claim 6, characterized in that, The first support plate (201) and the second support plate (202) are hinged at the cone position of the V-shaped structure. When the flow loss of the inner channel (7) is greater than the third threshold, the first support plate (201) or the second support plate (202) is rotated by the second driving mechanism to reduce the included angle of the V-shaped structure.

8. An afterburner, characterized in that, The afterburner has the adjustable mixing stabilizer structure as described in any one of claims 1-5.

Images