A front-shock-injector splitter ring leading edge structure for changing the split ratio
Patent Information
- Application Number
- CN202610725931.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-25
- Publication Date
- 2026-10-16
AI Technical Summary
[0005]传统分流段采用固定几何结构设计，结构参数无法随分流比变化进行自适应调整，难以同时适配宽范围分流比下的不同来流攻角工况，易引发气流分离、流动损失增大等问题，最终造成分流段气动性能显著下降，影响变循环发动机整体工作稳定性，无法充分发挥变循环发动机的宽域性能优势
本发明通过分流环前缘可调结构设计，借助套筒、调节板、补偿板与驱动机构的协同配合，实现分流环有效弧长及外涵道通流面积的灵活调节，进而精准改变分流比；同时通过调节角θ主动调控，使分流段能够自适应匹配不同分流比下的来流攻角变化，从根本上解决了传统固定几何分流段难以适配宽范围分流比、气动性能下降的技术问题，显著提升了分流环的工作稳定性与气流分配精度，进一步保障变循环发动机的宽域变循环调节效果，有效增强发动机的宽速域、宽空域适应能力。
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Figure CN122919627A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aero-engine technology, and more specifically to a front duct ejector splitter ring leading edge structure with a variable split ratio. Background Technology
[0002] Currently, countries worldwide are demanding wide-speed-range, wide-airspace, and high environmental adaptability from military aero engines. Traditional aero engines, limited by their inherent components and systems, are finding it increasingly difficult to meet these performance requirements. Conventional aero engines, designed with a fixed thermodynamic cycle (primarily a fixed bypass ratio), are increasingly unable to meet the dual performance targets of advanced fighter jets—high thrust-to-weight ratio and low cruise fuel consumption—under different operating conditions. Against this backdrop, variable-cycle engines have become the core technological direction for solving this problem.
[0003] As a key variable geometry component in a variable cycle engine, the flow splitter ring is installed downstream of the engine's first-stage fan, directly receiving the fan's outlet airflow. Its core function is to distribute the airflow between the outer bypass duct and the inner bypass duct according to the bypass ratio adjustment requirements of different engine operating conditions. The flow splitting accuracy and operational stability of the flow splitter ring directly determine the overall aerodynamic performance and variable cycle adjustment effect of the variable cycle engine, making it one of the core components ensuring stable operation of the engine over a wide range.
[0004] Variable cycle engines need to flexibly switch within a wide range of bypass ratios. As the core component of airflow distribution, the first-stage splitter section must maintain stable aerodynamic performance and operating conditions across this wide splitter ratio range to ensure accurate and reliable airflow distribution. In actual operation, engine bypass ratio adjustment causes continuous changes in the splitter ratio, which in turn leads to corresponding changes in the angle of attack of the incoming flow in the splitter section, resulting in fluctuations in the airflow state.
[0005] Traditional split sections employ a fixed geometric design, and their structural parameters cannot be adaptively adjusted according to changes in the split ratio. This makes it difficult to simultaneously adapt to different incoming flow angles under a wide range of split ratios, which can easily lead to problems such as airflow separation and increased flow losses. Ultimately, this results in a significant decrease in the aerodynamic performance of the split section, affecting the overall operational stability of the variable cycle engine and preventing it from fully leveraging the wide-range performance advantages of the variable cycle engine.
[0006] In view of the above, in order to overcome the above technical problems, the present invention designs a front edge structure of the front duct ejector splitting ring that changes the splitting ratio, thus solving the above technical problems. Summary of the Invention
[0007] The technical objective of this invention is to address the shortcomings of existing fixed-geometry splitter rings, such as their inability to adapt to a wide range of split ratios, poor aerodynamic performance, large flow losses, and low stability margins. This invention provides a front-edge structure for a front-bypass ejector splitter ring that alters the split ratio, enabling continuous and precise adjustment of the split ratio, improving the aerodynamic performance and operational stability of the split section across the entire operating range, broadening the engine's operating boundaries, and enhancing the variable cycle adjustment effect.
[0008] To achieve the above-mentioned technical objectives, the present invention provides the following technical solution: The present invention provides a front edge structure of a duct ejector with a variable split ratio, comprising, from left to right along the airflow direction: a fan section, a split inlet section, an adjustable split ring, and an intermediate casing; the intermediate casing has an inner duct and an outer duct inside, the inner duct being located below the intermediate casing and the outer duct being located above the intermediate casing; the adjustable split ring is installed downstream of the split inlet section and inside the intermediate casing, and the adjustable split ring is rotatably configured via a rotating shaft to change the flow area of the inner duct and the outer duct.
[0009] The adjustable diverting ring is composed of several adjusting units arranged end to end along the circumference; each adjusting unit includes an adjusting plate, a sleeve, and a compensating plate; the adjusting plate and the sleeve are nested together, and the compensating plate is nested between adjacent sleeves to seal the gap generated during the adjustment process; the adjustable diverting ring can rotate around the rotation axis to adjust the opening.
[0010] At the component connection level, the sleeve serves as a nested connection between the adjusting plate and the compensating plate, forming the complete adjustable flow divider ring body. The adjusting plate and the sleeve are nested together, and the compensating plate is nested between adjacent sleeves, serving as a sealing guide. This not only achieves pneumatic sealing between components, preventing performance loss caused by airflow leakage, but also acts as a motion guide, ensuring a smooth and stable adjustment process for the flow divider ring.
[0011] The rotating shaft is composed of multiple rotating shaft segments connected in series with multiple universal joints; the adjusting plate is fixedly connected to the rotating shaft, and the compensating plate is connected to the universal joints. The universal joints are preferably universal joints to ensure the flexibility and stability of the power transmission process and avoid the problem of power transmission jamming during the adjustment process; the adjustable diverter ring is hinged to a drive rod. When the drive rod drives the adjusting plate to rotate, it synchronously drives the compensating plate to extend and retract within the sleeve.
[0012] It also includes a drive mechanism; the drive mechanism includes a servo motor, a trapezoidal lead screw, a synchronous ring, a slide rail, and a cage; the output end of the servo motor is connected to the trapezoidal lead screw, which drives the synchronous ring to move axially; the slide rail is arranged parallel to both sides of the synchronous ring for guidance, and the cage connects the servo motor, the slide rail, and the synchronous ring into a whole; the synchronous ring is fixedly connected to the drive rod, and the end of the drive rod is hinged to the adjustment plate, converting the axial movement into the rotational movement of the adjustment plate.
[0013] The mechanism uses a servo motor as the core drive. The output end of the servo motor is connected to a trapezoidal lead screw. The lead screw drives the synchronous ring to move along the axial direction with several drive rods, thereby driving the splitter to rotate around the rotating shaft. The transmission part consists of parallel slide rails and synchronous rings. The motor, slide rails and synchronous rings are connected by a retainer. The slide rails on both sides can keep the synchronous ring moving along the axial direction and prevent it from tilting.
[0014] The number of drive rods is 3 to 6.
[0015] The geometric surface of the adjustable diversion ring is composed of a leading edge arc, a trailing edge arc, and two external common tangents; the height H of the diversion inlet section determines the adjustable section length l, where l is the distance between the center of the leading edge arc and the center of the trailing edge arc, satisfying the expression: l=a×H, and the adjustable section length coefficient a takes a value of 0.3 to 0.5.
[0016] Based on the flow channel height H of the diversion inlet section, the leading edge radius r of the adjustable diversion ring, and the leading edge radius coefficient b, the expression is satisfied: r = b × H, and the leading edge radius coefficient b takes a value of 0.015 to 0.05.
[0017] When the rotating shaft rotates clockwise, the compensation plate extends outward, the effective arc length of the flow divider ring increases, the flow area of the outer bypass decreases, and the bypass ratio decreases; when the rotating shaft rotates counterclockwise, the compensation plate contracts inward, the effective arc length of the flow divider ring decreases, the flow area of the outer bypass increases, and the bypass ratio increases.
[0018] Driven by a power source, the rotating shaft rotates clockwise / counterclockwise, coordinating with a universal joint to drive the adjusting plate to rotate synchronously, thereby causing the entire flow splitter ring to rotate. During this process, when the rotating shaft rotates clockwise, the compensating plates inside the sleeve extend outwards from both sides of the sleeve, increasing the effective arc length of the flow splitter ring; when the rotating shaft rotates counterclockwise, the compensating plates inside the sleeve retract inwards, decreasing the effective arc length of the flow splitter ring. This change in arc length directly leads to a corresponding adjustment of the flow area at the inlet of the bypass duct. An increase in the effective arc length results in a decrease in the bypass duct flow rate, and a decrease in the effective arc length results in an increase in the bypass duct flow rate, ultimately achieving flexible adjustment of the flow split ratio.
[0019] The adjustable flow splitter ring is provided with an adjustment angle θ; the adjustment angle θ is the angle between the center line of its axial section and the non-adjustable reference line when the adjustment plate rotates around the rotation axis, and is used to adapt to the angle of attack of the incoming flow under different flow splitting ratios.
[0020] When the airflow in the fan's outer duct passes through the leading edge structure of the front duct ejector splitter ring, it is split into two airflows. By adjusting the size of the adjustment angle θ (with the center line of the axial section of the adjustment plate when the splitter ring is in an unadjustable state as the reference line, and the angle formed between the center line of the axial section of the adjustment plate and the above reference line when the adjustment plate rotates around the rotation axis as the center, the angle of attack of the incoming flow under different split ratios can be adapted, effectively avoiding the occurrence of airflow separation, ensuring the accuracy of airflow distribution and the smoothness of the flow channel, and guaranteeing the aerodynamic performance of the splitter ring.
[0021] The beneficial effects of this invention are as follows: This invention utilizes an adjustable leading edge structure design for the splitter ring, employing the coordinated operation of a sleeve, adjusting plate, compensating plate, and drive mechanism to flexibly adjust the effective arc length of the splitter ring and the flow area of the outer bypass duct, thereby precisely changing the split ratio. Simultaneously, through active control of the adjustment angle θ, the splitter section can adaptively match changes in the incoming flow angle of attack under different split ratios. This fundamentally solves the technical problem of traditional fixed-geometry splitter sections being unable to adapt to a wide range of split ratios and resulting in decreased aerodynamic performance. It significantly improves the working stability and airflow distribution accuracy of the splitter ring, further ensuring the wide-range variable cycle adjustment effect of the variable cycle engine and effectively enhancing the engine's adaptability across a wide speed range and a wide airspace. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] The above and other aspects of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is a schematic diagram of the flow channel height H of the diversion inlet section of the present invention; Figure 3 This is a schematic diagram of the adjustment plate of the present invention; Figure 4 This is a diagram showing the adjustment state of the compensation plate of the adjustable diverter ring of the present invention; Figure 5 This is a diagram showing the sleeve extension and retraction adjustment state of the adjustable diverter ring of the present invention; Figure 6 This is a schematic diagram of the rotating shaft of the present invention; Figure 7 This is a schematic diagram of the driving mechanism of the present invention.
[0024] In the diagram: 1. Fan section; 2. Flow inlet section; 3. Adjustable flow ring; 31. Adjusting plate; 32. Sleeve; 33. Compensating plate; 34. Drive rod; 35. Adjustment angle θ; 4. Rotating shaft; 41. Rotating shaft; 42. Universal joint; 5. Intermediate housing; 6. Inner duct; 7. Outer duct; 8. Drive mechanism; 81. Servo motor; 82. Trapezoidal lead screw; 83. Synchronization ring; 84. Slide rail; 85. Cage. Detailed Implementation
[0025] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. The embodiments described below are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0026] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0027] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, the present invention provides a front edge structure for a ducted ejector with a variable flow ratio, comprising, from left to right along the airflow direction: a fan section 1, a flow inlet section 2, an adjustable flow ring 3, and an intermediate casing 5; the intermediate casing 5 has an inner duct 6 and an outer duct 7 on its inner side, the inner duct 6 being located below the intermediate casing 5 and the outer duct 7 being located above the intermediate casing 5; the adjustable flow ring 3 is installed downstream of the flow inlet section 2 and inside the intermediate casing 5, and the adjustable flow ring 3 is rotatably configured via a rotating shaft 4 to change the flow area of the inner duct 6 and the outer duct 7.
[0028] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, the adjustable diversion ring 3 is composed of several adjustment units arranged end to end along the circumferential direction; each adjustment unit includes an adjustment plate 31, a sleeve 32, and a compensation plate 33; the adjustment plate 31 and the sleeve 32 are nested together, and the compensation plate 33 is nested between adjacent sleeves 32 to seal the gap generated during the adjustment process; the adjustable diversion ring 3 can rotate around the rotation axis 4 to adjust the opening.
[0029] In terms of component connection structure, sleeve 32 serves as the nested mounting carrier for adjusting plate 31 and compensating plate 33, together forming the complete body of adjustable flow divider ring 3. Adjusting plate 31 and sleeve 32 are nested together, and compensating plate 33 is nested between adjacent sleeves 32, serving as both a sealing and guiding component. This achieves circumferential pneumatic sealing, preventing performance loss caused by airflow leakage, and also provides guidance for adjustment movement, ensuring smooth and stable adjustment of the flow divider ring.
[0030] like Figure 2 , 3 As shown in Figures 4, 5, and 6, the rotating shaft 4 is composed of multiple rotating shafts 41 connected in series with multiple universal joints 42; the adjusting plate 31 is fixedly connected to the rotating shaft 41, and the compensating plate 33 is connected to the universal joint 42. The universal joint is preferably a universal joint 42 to ensure the flexibility and stability of the power transmission process and avoid the problem of power transmission jamming during the adjustment process; the adjustable diverting ring 3 is hinged to a drive rod 34, and the corner of the drive rod 34 is set as a hinge. When the drive rod 34 drives the adjusting plate 31 to rotate, it synchronously drives the compensating plate 33 to extend and retract within the sleeve 32.
[0031] like Figure 7 As shown, it also includes a drive mechanism 8; the drive mechanism 8 includes a servo motor 81, a trapezoidal lead screw 82, a synchronous ring 83, a slide rail 84, and a retainer 85; the output end of the servo motor 81 is connected to the trapezoidal lead screw 82, and the trapezoidal lead screw 82 drives the synchronous ring 83 to move axially; the slide rail 84 is arranged parallel to both sides of the synchronous ring 83 for guidance, and the retainer 85 connects the servo motor 81, the slide rail 84, and the synchronous ring 83 into a whole; the synchronous ring 83 is fixedly connected to the drive rod 34, and the end of the drive rod 34 is hinged to the adjustment plate 31, converting the axial movement into the rotational movement of the adjustment plate 31.
[0032] The drive mechanism 8 uses a servo motor 81 as its power core, and the output end of the servo motor 81 is connected to a trapezoidal lead screw 82. The trapezoidal lead screw 82 drives a synchronous ring 83 to move several drive rods 34 axially, thereby converting linear motion into rotational motion, which drives the splitter to rotate around the rotating shaft 4. The transmission assembly consists of parallel slide rails 84 and synchronous rings 83, and the servo motor 81, slide rails 84 and synchronous rings 83 are integrated into one unit by a retainer 85. The slide rails 84 on both sides form a guiding constraint on the synchronous rings 83, ensuring that they move smoothly only along the axial direction and avoiding skewness and jamming.
[0033] like Figure 1 , 2 As shown in Figures 3, 4, and 7, the number of drive rods 34 is 3 to 6.
[0034] like Figure 2 , 3As shown in Figures 4, 5, 6, and 7, the geometric surface of the adjustable flow splitter ring 3 is composed of a leading edge arc, a trailing edge arc, and two external common tangents; the flow channel height H of the flow splitter inlet section 2 determines the adjustable section length l, where l is the distance between the center of the leading edge arc and the center of the trailing edge arc, satisfying the expression: l = a × H, and the adjustable section length coefficient a takes a value of 0.3 to 0.5.
[0035] The cross-sections of the regulating plate 31 and the compensating plate 33 are axisymmetric closed figures, and their outlines consist of a leading edge arc, a trailing edge arc, and two external common tangents to ensure a continuous and smooth flow channel surface. Specific geometric parameters of the flow divider ring, such as the axial length and radius of the leading edge, can be set according to specific structural requirements.
[0036] Based on considerations of adjustment margin, structural mechanics, and actuation system stiffness, the adjustable section length coefficient 'a' in the expression for the adjustable section length 'l' of the leading-edge adjustable splitter section ranges from 0.3 to 0.5. Research has shown that if 'a' is less than 0.3, meaning the axial adjustment stroke of the splitter section is too short, the splitter section will be unable to effectively shield the inner or outer bypass channel at its extreme positions (such as the fully closed position). Specifically, the outer bypass channel cannot achieve the expected "fully closed" state, thus failing to meet the engine's required adjustment range for the bypass ratio under specific operating conditions. If 'a' is greater than 0.5, meaning the cantilever length of the splitter section is too long, the aerodynamic bending moment on the leading edge of the splitter section will be significantly amplified due to the increased lever arm, leading to a sharp increase in the adjustment torque of the drive mechanism 8. To meet the limitations of actuation system size and power in practical engineering, 'a' must be limited to within 0.5, thereby maintaining the structural compactness and rapid response of the drive mechanism 8 while ensuring adjustment capability.
[0037] like Figure 2 , 3 As shown in Figures 4, 5, 6, and 7, based on the flow channel height H of the diversion inlet section 2, the leading edge radius r of the adjustable diversion ring 3, and the leading edge radius coefficient b, the expression is satisfied: r = b × H, and the leading edge radius coefficient b takes a value of 0.015 to 0.05.
[0038] Considering the aerodynamic adaptability under varying operating conditions and the blockage ratio of the flow area, the leading edge radius coefficient *b* in the expression for the leading edge adjustable splitter section ranges from 0.015 to 0.05. During operation, the adjustable splitter section needs to oscillate around axis 41 to change the airflow angle of attack. If *b* is less than 0.015, meaning the leading edge radius is too small and the profile is too sharp, its adaptability to changes in the incoming flow angle of attack will be significantly narrowed. Specifically, a sharp leading edge has poor adaptability to the incoming flow angle of attack, and its aerodynamic losses increase significantly with changes in the angle of attack, leading to a decrease in the total pressure recovery coefficient of the splitter section itself, thus weakening the performance benefits brought by variable cycle regulation. If *b* is greater than 0.05, meaning the size of the leading edge blunt body is too large, when the splitter section is in the intermediate regulation position, its excessive leading edge physical thickness will directly encroach on the throat flow area upstream of the splitter ring, resulting in a reduction in the effective cross-sectional area of the flow channel, an increase in additional airflow acceleration losses, and the formation of unnecessary throttling and blockage effects. Therefore, limiting b to the range of 0.015 to 0.05 ensures that the diversion section has a wide range of angle of attack adaptability while avoiding additional flow loss caused by blunt body blockage.
[0039] like Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, when the rotating shaft 4 rotates clockwise, the compensation plate 33 extends outward, the effective arc length of the flow divider ring increases, the flow area of the outer bypass 7 decreases, and the bypass ratio decreases; when the rotating shaft 4 rotates counterclockwise, the compensation plate 33 contracts inward, the effective arc length of the flow divider ring decreases, the flow area of the outer bypass 7 increases, and the bypass ratio increases.
[0040] Driven by the drive mechanism 8, the rotating shaft 4 rotates clockwise or counterclockwise, driving the adjusting plate 31 to rotate synchronously via the universal joint 42, thereby driving the entire adjustable flow divider ring 3 to rotate. During this process: when the rotating shaft 4 rotates clockwise, the compensating plate 33 inside the sleeve 32 extends outwards, increasing the effective arc length of the flow divider ring; when the rotating shaft 4 rotates counterclockwise, the compensating plate 33 retracts inwards, decreasing the effective arc length of the flow divider ring. The change in effective arc length directly alters the inlet flow area of the outer bypass duct 7. An increase in effective arc length reduces the flow rate in the outer bypass duct 7, while a decrease in effective arc length increases the flow rate in the outer bypass duct 7, ultimately achieving continuous and flexible adjustment of the flow divider ratio.
[0041] like Figure 1 and 2 As shown, the adjustable flow splitter ring 3 is provided with an adjustment angle θ35; the adjustment angle θ35 is the angle between the center line of the axial section of the adjustment plate 31 and the non-adjustable reference line when the adjustment plate 31 rotates around the rotation axis 4, which is used to adapt to the angle of attack of the incoming flow under different flow splitting ratios.
[0042] When the airflow from the outer bypass duct 7 flows through the leading edge structure of the front bypass ejector splitter ring, it is divided into two airflows: the inner bypass and the outer bypass. By adaptively adjusting the adjustment angle θ35 (defined as the angle between the center line of the axial section of the adjustment plate 31 and the reference line when the adjustment plate 31 rotates around the rotation axis 4 under the non-adjustable reference state), the incoming flow angle of attack corresponding to different split ratios can be matched, effectively suppressing airflow separation, ensuring accurate airflow distribution, smooth flow through the channel, and stable maintenance of the aerodynamic performance of the splitter ring.
[0043] During operation, the airflow from the fan section 1 exits into the adjustable splitter ring 3 region via the splitter inlet section 2. When the rotating shaft 4 rotates clockwise, the compensation plate 33 extends outward, increasing the effective arc length of the splitter ring, decreasing the flow area of the outer bypass duct 7, and thus decreasing the bypass ratio. When the rotating shaft 4 rotates counterclockwise, the compensation plate 33 retracts, further decreasing the effective arc length of the splitter ring, increasing the flow area of the outer bypass duct 7, and thus increasing the bypass ratio. The adjustment angle θ35 changes in real time with the rotation angle to adapt to the incoming flow angle at the current split ratio, preventing airflow separation and ensuring efficient and stable splitting.
[0044] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1. A front edge structure of a duct ejector splitter ring for changing the split ratio, characterized in that, The system comprises, from left to right along the airflow direction, a fan section (1), a diversion inlet section (2), an adjustable diversion ring (3), a rotating shaft (4), and an intermediate casing (5). The intermediate casing (5) has an inner duct (6) and an outer bypass duct (7) on its inner side. The inner duct (6) is located below the intermediate casing (5), and the outer bypass duct (7) is located above the intermediate casing (5). The adjustable diversion ring (3) is installed downstream of the diversion inlet section (2) and inside the intermediate casing (5). The adjustable diversion ring (3) is rotatably mounted via the rotating shaft (4) to change the flow area of the inner duct (6) and the outer bypass duct (7).
2. The front edge structure of the duct ejector splitter ring for changing the split ratio according to claim 1, characterized in that: The adjustable diverting ring (3) is composed of several adjusting units arranged end to end along the circumference; each adjusting unit includes an adjusting plate (31), a sleeve (32) and a compensation plate (33); the adjusting plate (31) and the sleeve (32) are nested together, and the compensation plate (33) is nested between adjacent sleeves (32) to seal the gap generated during the adjustment process; the adjustable diverting ring (3) can rotate around the rotating axis (4) to adjust the opening.
3. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 2, characterized in that: The rotating shaft (4) is composed of multiple rotating shafts (41) connected in series with multiple universal joints (42); the adjusting plate (31) is fixedly connected to the rotating shaft (41), and the compensation plate (33) is connected to the universal joint (42); the adjustable diverter ring (3) is hinged with a drive rod (34), and when the drive rod (34) drives the adjusting plate (31) to rotate, it synchronously drives the compensation plate (33) to extend and retract within the sleeve (32).
4. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 3, characterized in that: It also includes a drive mechanism (8); the drive mechanism (8) includes a servo motor (81), a trapezoidal lead screw (82), a synchronous ring (83), a slide rail (84), and a retainer (85); the output end of the servo motor (81) is connected to the trapezoidal lead screw (82), and the trapezoidal lead screw (82) drives the synchronous ring (83) to move axially; the slide rail (84) is arranged parallel to both sides of the synchronous ring (83) for guidance, and the retainer (85) connects the servo motor (81), the slide rail (84), and the synchronous ring (83) into a whole; the synchronous ring (83) is fixedly connected to the drive rod (34), and the end of the drive rod (34) is hinged to the adjustment plate (31), converting the axial movement into the rotational movement of the adjustment plate (31).
5. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 4, characterized in that: The number of drive rods (34) is 3 to 6.
6. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 5, characterized in that: The geometric surface of the adjustable diversion ring (3) is composed of a leading edge arc, a trailing edge arc and two external common tangents; the flow channel height H of the diversion inlet section (2) determines the adjustable section length l, where l is the distance between the center of the leading edge arc and the center of the trailing edge arc, satisfying the expression: l=a×H, and the adjustable section length coefficient a takes a value of 0.3 to 0.
5.
7. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 6, characterized in that: Based on the flow channel height H of the diversion inlet section (2), the leading edge radius r and leading edge radius coefficient b of the adjustable diversion ring (3) satisfy the expression: r = b × H, and the leading edge radius coefficient b takes a value of 0.015 to 0.
05.
8. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 7, characterized in that: When the rotating shaft (4) rotates clockwise, the compensation plate (33) extends outward, the effective arc length of the split ring increases, the flow area of the outer bypass (7) decreases, and the bypass ratio decreases; when the rotating shaft (4) rotates counterclockwise, the compensation plate (33) contracts inward, the effective arc length of the split ring decreases, the flow area of the outer bypass (7) increases, and the bypass ratio increases.
9. The front edge structure of the splitter ring of a front duct ejector with a changing split ratio according to claim 8, characterized in that: The adjustable flow splitter ring (3) is provided with an adjustment angle; the adjustment angle is the angle between the center line of its axial section and the non-adjustable reference line when the adjustment plate (31) rotates around the rotation axis (4), which is used to adapt to the angle of attack of the incoming flow under different flow splitting ratios.