Second outer culvert adjusting mechanism suitable for mixed exhaust of variable cycle engine

Abstract

The invention relates to the technical field of aero-engines, and discloses a second outer culvert adjusting mechanism suitable for variable cycle engine mixed exhaust, which comprises a main duct convergence adjusting sheet, a second outer culvert adjusting sheet, a main duct expansion adjusting sheet and a second outer culvert adjusting assembly, a second outer duct is formed between the second outer duct adjusting piece and the main duct convergence adjusting piece, and the second outer duct adjusting assembly is used for adjusting the angle of the second outer duct adjusting piece and the angle of the main duct convergence adjusting piece so as to control opening and closing of an outlet of the second outer duct. The second outer culvert adjusting mechanism is simple in structure, adjustment of the throat opening area of the second outer culvert is achieved through different elongation amounts of the actuator cylinders, and the second outer culvert adjusting mechanism has high adjusting capacity and can be flexibly adjusted according to the running state and exhaust requirements of the engine so as to achieve the optimal exhaust effect and engine performance.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and discloses a second bypass adjustment mechanism applicable to the mixed exhaust of a variable cycle engine. Background Art

[0002] The nozzle is the exhaust device of an aeroengine. High-temperature gas expands and does work in the nozzle to generate thrust.

[0003] Nozzles are classified into subsonic nozzles and supersonic nozzles according to exhaust performance, convergent nozzles and convergent-divergent nozzles according to different structural forms, fixed nozzles and adjustable nozzles according to mechanism forms, and can also be added with vector functions and stealth functions according to usage requirements.

[0004] The variable cycle engine is a current research direction. Compared with a conventional engine, the exhaust passage of a variable cycle engine increases from the core flow and bypass to the core flow, bypass and second bypass. Among them, if the second bypass is discharged by a separate nozzle, it becomes separate exhaust; if the second bypass and the core flow are mixed and then discharged, it becomes mixed exhaust.

[0005] In the case of mixed exhaust, the outlet area of the second bypass needs to be adjusted. Since the mixing position of the second bypass and the core flow is different in the mixed exhaust, there are various structural forms for adjusting the second bypass, and there are also various mechanism forms for adjusting the outlet area under each structural form. However, limited by the spatial structure of the nozzle flap, the moving range of the conventional adjustment mechanism is reduced, resulting in a decrease in the adjustment ability of the second bypass throat area. Summary of the Invention

[0006] The purpose of the present invention is to provide a second bypass adjustment mechanism applicable to the mixed exhaust of a variable cycle engine, which can realize the adjustment of the area of the second bypass throat port, has a large adjustment ability, and can be flexibly adjusted according to the operating state and exhaust requirements of the engine to achieve the best exhaust effect and engine performance.

[0007] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0008] A second bypass adjustment mechanism applicable to the mixed exhaust of a variable cycle engine, comprising:

[0009] A main duct convergent flap, the intake end of the main duct convergent flap is connected to the engine casing through a rotating pair;

[0010] A second bypass flap, the intake end of the second bypass flap is connected to the engine casing through a rotating pair, the second bypass flap is located outside the main duct convergent flap, and a second bypass passage is formed between the second bypass flap and the main duct convergent flap;

[0011] The main duct expansion adjustment vane, the intake end of the main duct expansion adjustment vane is connected to the outlet end of the second outer duct adjustment vane through a rotating pair;

[0012] The second outer duct adjustment assembly is used to adjust the angles of the second outer duct adjustment vane and the main duct convergent adjustment vane to control the opening and closing at the outlet of the second outer duct passage.

[0013] Further, the second outer duct adjustment assembly includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to the second outer duct adjustment vane, the other end of the first connecting rod is hinged to the second connecting rod, and the end of the second connecting rod away from the first connecting rod is hinged to the main duct convergent adjustment vane; it also includes an actuating cylinder, and the telescopic end of the actuating cylinder is hinged to the first connecting rod or the second connecting rod.

[0014] Further, the actuating cylinder, the first connecting rod, and the second connecting rod are all located in the second outer duct passage between the second outer duct adjustment vane and the main duct convergent adjustment vane.

[0015] Further, the actuating cylinder of the second outer duct adjustment assembly is a hydraulic actuating cylinder or an electric actuating cylinder, and its telescopic stroke range is 50 - 200 mm, and the stroke resolution ≤ 0.5 mm.

[0016] Further, the chord length ratio of the main duct convergent adjustment vane to the second outer duct adjustment vane is 1:(1.2 - 1.5), and the expansion angle of the main duct expansion adjustment vane is 8° - 15°.

[0017] Further, the hinge point of the second connecting rod and the main duct convergent adjustment vane is located at the 40% - 60% chord length position of the main duct convergent adjustment vane.

[0018] Further, the maximum opening and closing angle of the second outer duct adjustment vane is 0° - 45°, where 0° corresponds to the fully closed state of the second outer duct passage, and 45° corresponds to the fully open state.

[0019] Further, there are two sets of second outer duct adjustment mechanisms composed of the main duct convergent adjustment vane, the second outer duct adjustment vane, the main duct expansion adjustment vane, and the second outer duct adjustment assembly, and the two sets of second outer duct adjustment mechanisms are symmetrically arranged at the outlet end of the engine casing.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The second outer duct adjustment mechanism of the present invention has a simple structure. By different elongation amounts of the actuating cylinder, the adjustment of the area of the second outer duct throat is realized, and it has a large adjustment ability, and can be flexibly adjusted according to the operating state and exhaust requirements of the engine to achieve the best exhaust effect and engine performance. Description of the Drawings

[0021] Figure 1 Schematic diagram of the second bypass adjustment mechanism applicable to the mixed exhaust of a variable cycle engine in the embodiment;

[0022] Figure 2 Schematic diagram of the structure when the second bypass passage is closed in the embodiment;

[0023] Wherein, 1, main duct convergent flap; 2, second bypass flap; 3, second bypass passage; 4, main duct divergent flap; 5, first connecting rod; 6, second connecting rod; 7, actuator. Specific implementation mode

[0024] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0025] Embodiment

[0026] See Figure 1 , a second bypass adjustment mechanism applicable to the mixed exhaust of a variable cycle engine, comprising:

[0027] Main duct convergent flap 1, the intake end of the main duct convergent flap 1 is connected to the engine casing through a rotating pair;

[0028] Second bypass flap 2, the intake end of the second bypass flap 2 is connected to the engine casing through a rotating pair, the second bypass flap 2 is located outside the main duct convergent flap 1, and a second bypass passage 3 is formed between the second bypass flap 2 and the main duct convergent flap 1;

[0029] Main duct divergent flap 4, the intake end of the main duct divergent flap 4 is connected to the outlet end of the second bypass flap 2 through a rotating pair;

[0030] Second bypass adjustment assembly, the second bypass adjustment assembly is used to adjust the angle of the second bypass flap 2 and the angle of the main duct convergent flap 1 to control the opening and closing at the outlet of the second bypass passage 3.

[0031] In this embodiment, by different elongation amounts of the actuator 7, the adjustment of the area of the second bypass throat is realized, and it has a large adjustment ability, and can be flexibly adjusted according to the operating state and exhaust requirements of the engine to achieve the best exhaust effect and engine performance.

[0032] In this embodiment, the second outer duct adjusting assembly includes a first connecting rod 5 and a second connecting rod 6. One end of the first connecting rod 5 is hinged to the second outer duct adjusting flap 2, the other end of the first connecting rod 5 is hinged to the second connecting rod 6, and the end of the second connecting rod 6 away from the first connecting rod 5 is hinged to the main duct convergent adjusting flap 1. It further includes an actuating cylinder 7, and the telescopic end of the actuating cylinder 7 is hinged to the first connecting rod 5 or the second connecting rod 6. When the actuating cylinder 7 contracts, the adjusting mechanism is as shown in Figure 2 At this time, the actuating cylinder 7 drives the first connecting rod 5 to rotate counterclockwise, the first connecting rod 5 drives the second connecting rod 6 to rotate clockwise, and the second connecting rod 6 drives the main duct convergent adjusting flap 1 to rotate counterclockwise, so that the main duct convergent adjusting flap 1 is in close contact with the outlet of the second outer duct adjusting flap 2, realizing the closing of the second outer duct outlet. When the actuating cylinder 7 extends, at this time, the actuating cylinder 7 drives the first connecting rod 5 to rotate clockwise, the first connecting rod 5 drives the second connecting rod 6 to rotate counterclockwise, and the second connecting rod 6 drives the main duct convergent adjusting flap 1 to rotate clockwise, realizing that the main duct convergent adjusting flap 1 is away from the outlet of the second outer duct adjusting flap 2, and opening the second outer duct outlet.

[0033] In this embodiment, the actuating cylinder 7, the first connecting rod 5 and the second connecting rod 6 are all located in the second outer duct passage 3 between the second outer duct adjusting flap 2 and the main duct convergent adjusting flap 1. The space limitation is small and the movable range is large, which can further ensure that the second outer duct adjusting mechanism has a large adjusting ability.

[0034] In this embodiment, the actuating cylinder 7 of the second outer duct adjusting assembly is a hydraulic actuating cylinder 7 or an electric actuating cylinder 7, and its telescopic stroke range is 50 - 200 mm, and the stroke resolution ≤ 0.5 mm. While ensuring that the adjusting ability meets the requirements, it further ensures that the actuating cylinder 7 has high precision and reliability, and can meet the precise adjustment requirements of the second outer duct outlet opening degree of the variable cycle engine under different working conditions. The actuating cylinder 7 in this embodiment can be a hydraulic actuating cylinder 7 or an electric driving method, ensuring the quick response and stable operation of the actuating cylinder 7.

[0035] To ensure the smoothness and coordination of the main duct convergent adjusting flap 1 and the second outer duct adjusting flap 2 during the coordinated adjustment, in this embodiment, the chord length ratio of the main duct convergent adjusting flap 1 to the second outer duct adjusting flap 2 is 1:(1.2 - 1.5), and the expansion angle of the main duct expansion adjusting flap 4 is 8° - 15°.

[0036] In this embodiment, the hinge point of the second connecting rod 6 and the main duct convergent flap 1 is located at the 40%-60% chord length position of the main duct convergent flap 1, which can ensure that the second connecting rod 6 can transmit force more effectively when the main duct convergent flap 1 adjusts its angle, making the whole adjustment process smoother and more efficient. At the same time, the position selection of the hinge point also takes into account the overall structural compactness and stability of the adjustment mechanism, avoiding problems such as structural interference or adjustment failure caused by improper hinge point position.

[0037] In this embodiment, the maximum opening and closing angle of the second outer duct flap 2 is 0°-45°, where 0° corresponds to the fully closed state of the second outer duct 3, and 45° corresponds to the fully open state. The opening and closing angle range of 0°-45° provides sufficient flexibility for the adjustment of the engine, which can not only meet the exhaust requirements of the engine under different working conditions, but also enable the engine to better adapt to various complex working conditions.

[0038] In this embodiment, there are two sets of second outer duct adjustment mechanisms composed of the main duct convergent flap 1, the second outer duct flap 2, the main duct divergent flap 4 and the second outer duct adjustment assembly. The two sets of second outer duct adjustment mechanisms are symmetrically arranged at the outlet end of the engine casing. It can be symmetrical with the center line ( Figure 1 the dotted line in it) as the symmetry line, and form a double-set adjustment mechanism symmetrically up and down to jointly adjust the throat and the second outer duct outlet area. At this time, the nozzle is a conventional two-dimensional nozzle. By jointly adjusting up and down, the operation range of the adjustment mechanism can be reduced by half, and the efficiency of the adjustment mechanism is improved, providing a more efficient and reliable solution for the mixed exhaust of the variable cycle engine.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A second outer by-pass regulating mechanism suitable for mixed exhaust of a variable cycle engine, characterized in that: include: A main duct convergence adjusting plate, wherein the air inlet end of the main duct convergence adjusting plate is connected to the engine casing via a rotating pair; A second outer duct adjustment plate, wherein the air inlet end of the second outer duct adjustment plate is connected to the engine casing via a rotating pair, the second outer duct adjustment plate is located outside the main duct convergence adjustment plate, and a second outer duct channel is formed between the second outer duct adjustment plate and the main duct convergence adjustment plate; A main duct expansion adjusting plate, wherein the air inlet end of the main duct expansion adjusting plate is connected to the air outlet end of the second outer duct adjusting plate through a rotating pair; The second outer duct regulating component is used to adjust the angle of the second outer duct regulating plate and the angle of the main duct convergence regulating plate to control the opening and closing of the second outer duct channel outlet.

2. The second outer by-pass regulating mechanism suitable for mixed exhaust of variable cycle engine according to claim 1, characterized in that: The second outer duct adjustment assembly includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the second outer duct adjustment plate, the other end of the first connecting rod is hinged to the second connecting rod, and the end of the second connecting rod away from the first connecting rod is hinged to the main duct convergence adjustment plate; it also includes an actuator cylinder, the telescopic end of the actuator cylinder is hinged to the first connecting rod or the second connecting rod.

3. The second outer by-pass regulating mechanism suitable for mixed exhaust of variable cycle engine according to claim 2, characterized in that: The actuator, the first connecting rod and the second connecting rod are all located in the second outer duct channel between the second outer duct adjustment plate and the main duct convergence adjustment plate.

4. The second outer bypass regulating mechanism suitable for mixed exhaust of variable cycle engine according to claim 2, characterized in that: The actuator of the second outer regulating assembly is a hydraulic actuator or an electric actuator, and its telescopic stroke range is 50-200mm, and the stroke resolution is ≤0.5mm.

5. The second outer bypass regulating mechanism suitable for mixed exhaust of variable cycle engine according to claim 1, characterized in that: The ratio of the chord length of the main duct convergence adjustment plate to the chord length of the second outer duct adjustment plate is 1:(1.2-1.5), and the expansion angle of the main duct expansion adjustment plate is 8°-15°.

6. The second outer bypass regulating mechanism suitable for mixed exhaust of variable cycle engine according to claim 2, characterized in that: The hinge point between the second connecting rod and the main duct convergence adjusting piece is located at 40%-60% of the chord length of the main duct convergence adjusting piece.

7. The second outer by-pass regulating mechanism suitable for mixed exhaust of a variable cycle engine according to claim 1, characterized in that: The maximum opening and closing angle of the second outer duct adjustment piece is 0°-45°, wherein 0° corresponds to the fully closed state of the second outer duct channel, and 45° corresponds to the fully open state.

8. The second outer bypass regulating mechanism suitable for mixed exhaust of a variable cycle engine according to any one of claims 1 to 7, characterized in that: There are two groups of second outer duct adjustment mechanisms consisting of a main duct convergence adjustment plate, a second outer duct adjustment plate, a main duct expansion adjustment plate and a second outer duct adjustment assembly. The two groups of the second outer duct adjustment mechanisms are symmetrically arranged at the outlet end of the engine casing.

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