A structure of an inner-outer area ratio adjustable mixer

Abstract

The application discloses a kind of inner and outer area ratio adjustable mixer structure, hinged with mixer adjusting piece on the mixer inner casing, and the inner and outer area ratio is independently infinitely adjustable by the connecting rod of driving mechanism to drive mixer adjusting piece rotation;The driving mechanism includes setting in the mixer inner casing on actuator cylinder, actuator cylinder is connected with actuating ring, actuating ring is connected with connecting rod by the cooperation of second pin shaft and second bushing, and connecting and driving mixer adjusting piece are connected;Actuator cylinder pushes actuating ring axial movement, and actuating ring axial movement drives connecting rod to move angularly, to drive mixer adjusting piece rotation.The device inner and outer area ratio is independently infinitely adjustable, and the outlet inner and outer area ratio is automatically adjusted to match in the main machine circulation parameter variation in full package line range, can guarantee better mixing efficiency in the wide variation range of main machine circulation parameter in full package line range, does not affect the normal work of main machine, satisfies the use demand of variable cycle engine.

Description

Technical Field

[0001] This invention belongs to the technical field of afterburner technology for aero-engines, specifically relating to a mixer structure with an adjustable inner and outer bypass area ratio. Background Technology

[0002] As a crucial mixing component in aero-turbofan engines, the mixer blends the two airflows from the inner and outer bypass sections, which differ in pressure, temperature, and velocity, to achieve uniform airflow parameters. This creates favorable conditions for combustion in the afterburner. Compared to traditional aero-turbofan engines, their thermodynamic cycle remains constant, the main engine cycle parameters vary within a small range, and the mixer, with its fixed inner and outer bypass area, meets the engine's operational requirements.

[0003] To meet the power requirements of next-generation fighter jets, the demands on the comprehensive performance and economy of aero engines are increasingly stringent. The emergence of the variable cycle engine design concept perfectly addresses these requirements, enabling the engine to possess excellent comprehensive performance and economy across its entire envelope. For variable cycle engines, the range of variation in main cycle parameters is widened, and the bypass ratio varies significantly within the envelope. Fixed-area mixers are no longer sufficient. The ratio of the inner and outer bypass area at the mixer outlet changes with the main cycle parameters, matching the optimal operating mode to achieve the required comprehensive performance and economy across the entire engine envelope. Therefore, research on mixers with adjustable inner and outer bypass area ratios has become a focus, and accelerating the engineering application of variable cycle engines is of great significance.

[0004] A staggered rear duct ejector mixer, disclosed in CN115711187A, includes a splitter ring, a rear duct ejector mixer, and an actuating device, wherein the guide vanes of the rear duct ejector mixer and the guide vanes of the splitter ring are staggered. This invention adjusts the rear duct ejector mixer to ensure that the area requirement at the mixer outlet section is met by the variable cycle engine in different operating modes. In medium or high bypass ratio operating modes, a strong flow vortex is formed downstream of the rear duct ejector mixer between the high-temperature airflow in the inner core and part of the low-temperature airflow in the outer core, enhancing the mixing effect of the high-temperature airflow in the inner core and part of the low-temperature airflow in the outer core channel. In low bypass ratio operating modes, the guide vanes of the rear duct ejector mixer and the guide vanes of the splitter ring are parallel, effectively reducing the flow loss of the rear duct ejector mixer. However, adjusting the duct flow path is complex and imprecise. Summary of the Invention

[0005] To address the aforementioned problems, this invention aims to provide a mixer structure with an adjustable inner and outer culvert area ratio.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a mixer structure with an adjustable ratio of inner and outer bypass area, comprising a turbine support casing and a mixer inner casing arranged at the inner end along the same central axis, the outer bypass casing and the afterburner casing being connected and arranged at the outer end, a mixer adjusting plate being hinged on the mixer inner casing, and the mixer adjusting plate being rotated by the connecting rod of the drive mechanism to achieve autonomous stepless adjustment of the ratio of inner and outer bypass area.

[0007] The mixer inner casing has several mixer adjustment plates arranged circumferentially. The drive mechanism includes an actuating cylinder arranged on the mixer inner casing. The moving end of the actuating cylinder is connected to an actuating ring. Multiple connecting rods are hinged on the circumference of the actuating ring. The other end of the connecting rods is hinged to the outer wall surface of the mixer adjustment plate.

[0008] The actuating ring is connected to the connecting rod via a second pin and a second bushing. The connecting rod is connected to the drive mixer adjusting plate. The actuating cylinder pushes the actuating ring to move axially. The axial movement of the actuating ring causes the connecting rod to move angularly, thereby driving the mixer adjusting plate to rotate.

[0009] The mixer adjustment plate is evenly distributed along the circumference of the mixer inner casing and is hinged by the first pin (8), the first bushing (12) and the cotter pin. The mixer adjustment plate can rotate around the central axis of the first pin and the adjustable range of the mixer adjustment plate is 0°-30°.

[0010] A gap of 1-2 mm is provided between the mixer adjusting plate and the mixer inner casing. The gap between the mixer inner casing outlet and the afterburner casing is 20-30 mm. Several cooling gas ducts are provided at the mixer inner casing outlet.

[0011] The mixer inner casing and mixer adjusting plate are provided with several evenly distributed reinforcing ribs.

[0012] The afterburner casing is fixed to the outer bypass casing by bolts and self-locking nuts.

[0013] The mixer inner casing is secured to the turbine support casing by bolts and self-locking nuts.

[0014] The actuator cylinder is connected to the actuator ring via a hollow pin and a third bushing.

[0015] The adjustable mixer structure has an inner cone in the middle.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This structure uses a drive mechanism to drive the mixer adjusting plate to rotate, so as to achieve autonomous stepless adjustment of the ratio of the inner and outer duct areas of the mixer outlet; at the same time, it uses the principle of the most stable triangle for limiting, that is, after the actuator cylinder extends / contracts to the design requirements, the actuator ring is fixed. The hinge points of the actuator ring and the connecting rod, the connecting rod and the mixer adjusting plate, and the mixer adjusting plate and the inner casing of the mixer form a stable triangle, so as to fix the mixer adjusting plate.

[0018] 2. The mixer adjustment plate of this structure is designed to be infinitely adjustable within the range of 0°-30°, which meets the requirements of matching and mixing efficiency for a wide range of changes in the main unit's circulation parameters.

[0019] 3. The gap between the mixer inner casing outlet and the afterburner casing of this structure is 20-30mm, and several cooling air ducts are opened at the mixer inner casing outlet to introduce low-temperature air into the cooling chamber of the injection / stabilization integrated component to ensure the cooling system of the afterburner and the cooling air consumption of the injection / stabilization integrated component.

[0020] 4. The gap between the mixer regulating plate and the inner casing of the mixer is set to 1-2mm. Low-temperature air flows out from this gap, wraps around the mixer regulating plate, forms a protective air film, reduces its operating temperature, improves reliability, improves the operating temperature of the mixer regulating plate, and prevents interference after thermal deformation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an isometric view of the assembly of the mixer with adjustable inner and outer culvert area ratio of the present invention;

[0023] Figure 2 This is an isometric view of the mixer with adjustable inner and outer culvert area ratio of the present invention;

[0024] Figure 3 This is a partially enlarged isometric view of the mixer with adjustable inner and outer culvert area ratio of the present invention;

[0025] Figure 4 This is a partially enlarged right view of the mixer with adjustable inner and outer duct area ratio of the present invention;

[0026] Figure 5 yes Figure 4 A cross-sectional view of AA when the mixer adjustment plate angle is 30°;

[0027] Figure 6 yes Figure 4 A cross-sectional view of AA when the angle of the mixer adjustment plate is 0°;

[0028] In the diagram, 1-turbine support casing; 2-outer bypass casing; 3-afterburner casing; 4-inner cone; 5-mixer inner casing; 6-actuator cylinder; 7-actuator ring; 8-first pin; 9-mixer adjusting plate; 10-bolt; 11-self-locking nut; 12-first bushing; 13-second pin; 14-second bushing; 15-connecting rod; 16-hollow pin; 17-third bushing. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0030] Reference Figure 1 and Figure 2 An adjustable mixer structure with an adjustable inner and outer bypass area ratio includes a turbine support casing 1, an outer bypass casing 2, an afterburner casing 3, an inner cone 4, a mixer inner casing 5, an actuator cylinder 6, an actuator ring 7, a first pin 8, a mixer adjusting plate 9, bolts 10, self-locking nuts 11, a first bushing 12, a second pin 13, a second bushing 14, a connecting rod 15, a hollow pin 16, and a third bushing 17. The afterburner casing 3 is fixed to the outer bypass casing 2 by bolts and self-locking nuts, and the mixer inner casing 5 is fixed to the turbine support casing 1 by bolts 10 and self-locking nuts 11. The mixer adjusting plate 9 is connected to the mixer inner casing 5 by the first pin 8 and the first bushing 12, and is hinged to the mixer inner casing 5 by a cotter pin, and can rotate around the central axis of the first pin 8.

[0031] Reference Figure 3 The inner casing 5, actuator cylinder 6, actuator ring 7, second pin 13, second bushing 14, and connecting rod 15 of the mixer form a drive mechanism. The actuator cylinder 6 pushes the actuator ring 7 to move axially. The axial movement of the actuator ring 7 drives the connecting rod 15 to move angularly, which drives the mixer adjusting plate 9 to rotate. The adjustment plate 9 deflects to change the area distribution of the inner and outer channels, matching the changes in the main unit's circulation parameters.

[0032] See Figures 4-6The actuator cylinder 6 drives the actuator ring 7 to move axially, and the actuator ring 7 drives the connecting rod 15 to make angular displacement, driving the mixer adjusting plate 9 to rotate within the range of 0°-30°, so as to realize the adjustable ratio of the inner and outer duct area of ​​the mixer outlet. At the same time, the principle of the most stable triangle is used for limiting. That is, after the actuator cylinder 6 extends / contracts to the design requirements, the actuator ring 7 is fixed. The hinge points of the actuator ring 7 and the connecting rod 15, the connecting rod 15 and the mixer adjusting plate 9, and the mixer adjusting plate 9 and the mixer inner casing 5 form a stable triangle, so that the mixer adjusting plate 9 is fixed and works stably. The extension or contraction displacement of the actuator cylinder 6 and the deflection angle of the mixer adjusting plate 9 have a unique correspondence, which can realize the precise adjustment of the ratio of the inner and outer duct area of ​​the mixer outlet.

[0033] The mixer adjusting vanes 9 are evenly distributed around the inner casing 5 of the mixer. To achieve good mixing efficiency throughout the entire envelope, the mixing of the inner and outer bypass airflows is more uniform, and the combustion conditions in the afterburner are improved. 32 evenly distributed mixer adjusting vanes 9 are optimal. At the same time, the mixer adjusting vanes 9 are designed to be adjustable within the range of 0°-30°, with a width of 50mm and a length of 150mm, which can meet the requirements of matching and mixing efficiency for a wide range of main engine cycle parameters throughout the entire envelope.

[0034] The gap between the mixer regulating plate 9 and the mixer inner casing 5 is set to 1-2mm. The external low-temperature air flows out from this gap, wraps around the mixer regulating plate, forms a protective gas film, reduces its operating temperature, improves reliability, and can improve the operating temperature of the mixer regulating plate 9 and prevent interference after thermal deformation. The gap between the outlet of the mixer inner casing 5 and the afterburner casing 3 is 20-30mm, and several cooling air ducts are opened at the outlet of the mixer inner casing 5 to introduce low-temperature air into the cooling chamber of the injection / stabilization integrated component, ensuring the cooling system of the afterburner and the cooling air consumption of the injection / stabilization integrated component.

[0035] Several evenly distributed reinforcing ribs, 1-2 mm high and 2-3 mm wide, are provided on the mixer inner casing 5 and the mixer adjusting plate 9, which can improve the structural strength of the mixer inner casing and the mixer adjusting plate.

[0036] To ensure that the actuating ring only performs axial movement, four circumferentially distributed actuating cylinders 6 are provided to drive the actuating ring 7 to perform axial movement. The actuating cylinders 6 are connected to the actuating ring 7 through a hollow pin 16 and a third bushing 17.

[0037] The present invention has provided a detailed description of a mixer structure with an adjustable inner and outer flow area ratio. Specific examples have been used to illustrate the structure and working principle of the invention. The descriptions of the embodiments are merely for the purpose of helping to understand the method and core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A mixer structure with an adjustable ratio of inner and outer bypass area, comprising a turbine support casing (1) and an inner mixer casing (5) disposed at the inner end along the same central axis, and an outer bypass casing (2) and an afterburner casing (3) connected and disposed at the outer end, characterized in that: A mixer adjustment plate (9) is hinged on the inner casing (5) of the mixer, and the mixer adjustment plate (9) is driven to rotate through the connecting rod (15) of the drive mechanism to achieve the autonomous stepless adjustment of the inner and outer duct area ratio; The mixer inner casing (5) is provided with a number of mixer adjustment plates (9) along the circumference. The drive mechanism includes an actuating cylinder (6) provided on the mixer inner casing (5). The moving end of the actuating cylinder (6) is connected to an actuating ring (7). Multiple connecting rods (15) are hinged on the circumference of the actuating ring (7). The other end of the connecting rods (15) is hinged to the outer wall surface of the mixer adjustment plate (9). The actuating ring (7) is connected to the connecting rod (15) through the second pin (13) and the second bushing (14). The connecting rod (15) is connected to the mixer adjusting plate (9). The actuating cylinder (6) pushes the actuating ring (7) to move axially. The axial movement of the actuating ring (7) drives the connecting rod (15) to move angularly, thereby driving the mixer adjusting plate (9) to rotate. A gap of 1-2 mm is provided between the mixer adjusting plate (9) and the mixer inner casing (5). The gap between the outlet of the mixer inner casing (5) and the afterburner casing (3) is 20-30 mm. Several cooling gas ducts are provided at the outlet of the mixer inner casing (5).

2. The mixer structure with adjustable inner and outer culvert area ratio according to claim 1, characterized in that: The mixer adjustment plate (9) is evenly distributed around the inner casing (5) of the mixer and is hinged by the first pin (8), the first bushing (12) and the cotter pin. The mixer adjustment plate (9) can rotate around the central axis of the first pin (8). The adjustable range of the mixer adjustment plate (9) is 0°-30°.

3. The mixer structure with adjustable inner and outer culvert area ratio according to claim 1, characterized in that: Several evenly distributed reinforcing ribs are provided on the inner casing (5) of the mixer and the mixer adjusting plate (9).

4. The mixer structure with adjustable inner and outer culvert area ratio according to claim 1, characterized in that: The afterburner casing (3) is fixed to the outer bypass casing (2) by bolts and self-locking nuts.

5. The mixer structure with adjustable inner and outer culvert area ratio according to claim 1, characterized in that: The mixer inner casing (5) is fixed to the turbine support casing (1) by bolts (10) and self-locking nuts (11).

6. The mixer structure with adjustable inner and outer culvert area ratio according to claim 1, characterized in that: The actuator cylinder (6) is connected to the actuator ring (7) through a hollow pin (16) and a third bushing (17).

7. The mixer structure with adjustable inner and outer culvert area ratio according to claim 1, characterized in that: The adjustable mixer structure has an inner cone (4) in the middle.

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