Variable geometry turbine guide vane combination adjustment structure and method

Abstract

This invention relates to the field of turbine guide vane technology, specifically to a variable geometry turbine guide vane combined adjustment structure and method, comprising: a segmented adjustable blade, including a fixed segment blade and a rotating segment blade; a sliding blade endwall rotatably connected to the rotating segment blade; and an I-shaped segmented guide vane casing providing sliding space for the sliding blade endwall. The beneficial effects of this invention are: by dividing the blade into a fixed segment blade and a rotating segment blade, the rotating segment blade possesses both independent rotational and sliding motion capabilities, and can achieve a combination of these two motions. The rotating segment blade actively increases the distance between itself and the fixed segment blade through sliding, providing greater space margin for rotation, thereby breaking through the rotation angle limit of traditional segmented rotating adjustment structures; simultaneously, since the rotating segment blade and the fixed segment blade always remain adjacent and together form a complete blade channel, the problem of periodic flow field disruption is avoided.

Description

Technical Field

[0001] This invention belongs to the field of turbine guides, and specifically relates to a variable geometry turbine guide combined adjustment structure and method. Background Technology

[0002] The turbine is the core component of an aero gas turbine engine. Traditional fixed-geometry turbines generally only achieve optimal performance under their design conditions. To meet the operational requirements of advanced power units such as variable-cycle engines and adaptive engines under different flight conditions, variable-geometry turbine technology has emerged. Its core purpose is to control turbine flow by changing the throat flow area of ​​the turbine guide vane passage, thereby ensuring the engine is always in an optimal operating state.

[0003] To overcome the shortcomings of all-moving blades, those skilled in the art have attempted to improve the guide vane from different kinematic and structural perspectives, but have consistently failed to achieve a breakthrough in "ultra-wide throat area adjustment." This is specifically manifested in the following two typical existing technologies: The first type is the segmented rotational adjustment technology (e.g., the Chinese patent application publication number CN120537604A). This technology divides the blade into a fixed front lobe and a rotatable rear lobe. Its drawback is that the adjustment range is strictly limited by physical interference. When the rotating lobe rotates around the fixed axis to further expand the throat flow area, the rotating lobe is highly susceptible to mechanical collision and interference with the fixed lobe. This adjustment method, which relies purely on "rotation in place," has an insurmountable limit to the rotation angle, thus limiting its ability to expand the maximum flow area and making it difficult to meet the ultra-high flow rate requirements of advanced engines.

[0004] The second type is translational sliding adjustment technology (e.g., Chinese patent application publication number CN120026968A). This technology divides the guide vanes into fixed guide vanes arranged at intervals and adjustable guide vanes. The adjustable guide vanes move along the upper and lower sliding grooves of the casing. Although this scheme avoids the large clearance problem caused by rotation, the throat area gain brought by pure axial / circumferential translation is limited. More seriously, this "alternating static and dynamic" interval adjustment mode leads to different areas between the blade channels, which will disrupt the periodicity of the flow field in the turbine channel and cause strong unsteady flow wakes and aerodynamic shock waves.

[0005] Therefore, a variable geometry turbine guide assembly adjustment structure and method are needed to improve throat adjustment capability. Summary of the Invention

[0006] To address the aforementioned problems, embodiments of the present invention provide a variable geometry turbine guide combined adjustment structure and method, thereby achieving the objective of solving the problems raised in the background art.

[0007] To achieve the above objectives, this invention employs the following technical solution: a variable geometry turbine guide assembly adjustment structure, comprising: a segmented adjustable blade, including a fixed segment blade and a rotating segment blade; a slidable blade end wall rotatably connected to the rotating segment blade; and a guide I-shaped segmented housing providing sliding space for the slidable blade end wall; wherein the rotating segment blade is configured to: rotate relative to the fixed segment blade to change the throat flow area of ​​the blade channel; slide integrally with the slidable blade end wall within the guide I-shaped segmented housing; rotate relative to the fixed segment blade while sliding integrally with the slidable blade end wall; and increase the distance between the rotating segment blade and the fixed segment blade after integral sliding adjustment to increase the rotatable angle.

[0008] As a further improvement to the above technical solution: The segmented adjustable blade also includes a rotating column, which is fixed inside the rotating blade, rotatably connected to and passes through the end wall of the sliding blade to connect with the adjustment mechanism, and is used to drive the rotating blade to rotate and slide.

[0009] The fixed-edge blade includes a leading edge and a front blade body of the pressure face, and the upper and lower sides of the fixed-edge blade are fixedly connected to the guide I-shaped splitting casing; the rotating-edge blade includes a suction face and a trailing edge blade body.

[0010] The sliding blade end wall includes: an end wall sealing plate adapted to slide within the sliding space of the guide I-shaped split housing and form a seal; a sealing ring for sealing the gap between the rotating column and the end wall sealing plate; and a cover plate threaded to the outside of the rotating column for pressing the sealing ring.

[0011] The guide I-shaped split housing has a groove, and the end wall sealing plate is a thin sheet structure that can be inserted into the groove, forming a sealing structure with the upper and lower end faces of the groove.

[0012] The contact surfaces of the groove and the end wall sealing plate are coated with a wear-resistant coating.

[0013] The guide I-shaped split housing includes a main body, and the empty portion formed by the main body provides space for the sliding of the rotating column.

[0014] The guide I-shaped segmented housing is arc-shaped, and multiple guide I-shaped segmented housings can be enclosed to form a circular structure; there are gaps between the upper and lower sides of the rotating petal blade and the guide I-shaped segmented housing.

[0015] The curvature of the end wall of the sliding blade is adapted to the curvature of the I-shaped split casing of the guide.

[0016] An adjustment method based on the above-mentioned variable geometry turbine guide combined adjustment structure includes: Split-type adjustable blade rotation adjustment method: The rotating blade rotates relative to the fixed blade to adjust the throat flow area; Integrated sliding adjustment method: The rotating petal blade and the end wall of the sliding blade slide together within the guide I-shaped petal splitting housing to adjust the throat position; Integrated sliding and rotating adjustment method: The rotating valve blade and the end wall of the sliding blade slide together as a whole. During the sliding process, the rotating valve blade rotates to adjust the throat position and throat flow area, while increasing the distance between the rotating valve blade and the fixed valve blade to improve the rotatable angle of the rotating valve blade.

[0017] The beneficial effects of the embodiments of the present invention are as follows: The variable geometry turbine guide vane combined adjustment structure of this application divides the blades into fixed and rotating blades, enabling the rotating blades to possess both independent rotational and sliding motion capabilities, and allowing for the combination of these two motions. The rotating blades actively increase the distance between themselves and the fixed blades through sliding, providing greater space margin for rotation and thus breaking through the rotation angle limit of traditional segmented rotation adjustment structures. Simultaneously, because the rotating and fixed blades always remain adjacent and together form a complete blade channel, the periodic disruption of the flow field caused by the alternating "dynamic and static" arrangement in translational sliding adjustment technology is avoided. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the split-type adjustable blade of the present invention; Figure 3 This is a schematic diagram of the structure of the rotating petal blade of the present invention; Figure 4 This is a schematic diagram of the structure at the end wall of the sliding blade of the present invention; Figure 5 This is a schematic diagram of the structure of the I-shaped split-type housing of the guide of the present invention; Figure 6 This is a reference diagram showing the assembly state of the present invention; Figure 7 This is a schematic diagram of the self-rotation adjustment method of the split-blade adjustable blade of the present invention; Figure 8 This is a schematic diagram of the integrated sliding adjustment method of the present invention; Figure 9 This is a schematic diagram of the integrated sliding and rotating adjustment method of the present invention.

[0019] In the diagram: 1. Split-type adjustable blades; 2. Sliding blade endwalls; 3. I-shaped split-type guide housing; 4. Expanded meridional flow channel; 11. Rotating valve blade; 12. Fixed valve blade; 13. Rotating column; 21. End wall sealing plate; 22. Sealing ring; 23. Cover plate; 31. Main body; 32. Groove; 33. Empty part. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0021] See Figures 1 to 9 This invention discloses a variable geometry turbine guide assembly adjustment structure, comprising: a segmented adjustable blade 1, including a fixed blade 12 and a rotating blade 11; a sliding blade end wall 2, rotatably connected to the rotating blade 11; and a guide I-shaped segmented housing 3, providing sliding space for the sliding blade end wall 2; wherein the rotating blade 11 is configured to: rotate relative to the fixed blade 12 to change the throat flow area of ​​the blade channel; slide integrally with the sliding blade end wall 2 within the guide I-shaped segmented housing 3; rotate relative to the fixed blade 12 while sliding integrally with the sliding blade end wall 2; and increase the distance between the rotating blade 11 and the fixed blade 12 after integral sliding adjustment to increase the rotatable angle.

[0022] For ease of understanding, some key components in this embodiment are explained below: The split-blade adjustable blade 1 divides a single blade of the turbine guide vane into two independent parts: a fixed blade 12 and a rotating blade 11. This split structure allows different parts of the blade to move relatively independently, thereby achieving adjustment of the throat flow area.

[0023] The fixed-blade 12 is the part of the split-type adjustable blade 1 that is fixed in position, and typically includes the leading edge of the blade and the front blade body of the pressure face. The upper and lower sides of the fixed-blade 12 are fixedly connected to the guide I-shaped split-blade casing 3, serving as the fixed reference for the entire adjustment structure.

[0024] The rotating blade 11 is the movable part of the split-type adjustable blade 1, and typically includes a suction surface and a trailing edge blade. The rotating blade 11 can rotate and slide relative to the fixed blade 12 under the drive of aerodynamic loads and adjustment mechanisms, thereby changing the geometry of the blade channel and the throat flow area.

[0025] The sliding blade end wall 2, which is an end wall structure rotatably connected to the rotating blade 11, can slide within the sliding space provided by the guide I-shaped splitting housing 3. The sliding blade end wall 2 and the rotating blade 11 form a sliding motion unit as a whole.

[0026] The guide vane I-shaped segmented casing 3 is the casing structure of the turbine guide vane. It adopts an I-shaped cross-section design to provide sliding space for the sliding blade endwall 2. The guide vane I-shaped segmented casing 3 has an arc-shaped segmented structure, and multiple casings can be closed to form a complete ring.

[0027] This embodiment provides a variable geometry turbine guide combined adjustment structure, the specific structure and working method of which are as follows: The adjustment structure includes a split-type adjustable blade 1, which consists of two parts: a fixed blade 12 and a rotating blade 11. The fixed blade 12, as the front part of the blade (including the leading edge and pressure surface), is fixed in position; the rotating blade 11, as the rear part of the blade (including the suction surface and trailing edge), is the movable adjustment part.

[0028] The sliding blade end wall 2 is rotatably connected to the rotating blade 11. The sliding blade end wall 2 serves as the end wall of the rotating blade 11, and the two are linked in motion. The guide I-shaped splitting housing 3 provides sliding space for the sliding blade end wall 2, allowing the sliding blade end wall 2 to slide together with the rotating blade 11 inside the housing.

[0029] The rotating vane 11 is configured to perform a variety of combined adjustment actions. First, the rotating vane 11 can be rotated relative to the fixed vane 12, that is, rotated about its own axis of rotation. The throat flow area of ​​the vane channel is changed by altering the angles of multiple rotating vanes 11 (e.g., ...). Figure 7 (As shown). Secondly, the rotating blade 11 and the sliding blade end wall 2 can be integrally slidably adjusted inside the guide I-shaped splitting housing 3, that is, the rotating blade 11 and the sliding blade end wall 2 move as a whole along the sliding space of the housing, thereby changing the position of the throat in the expanding meridional channel 4 (as shown). Figure 8(As shown). Third, the rotating valve blade 11 can be adjusted by sliding simultaneously with the fixed valve blade 12, i.e., sliding and rotation are performed at the same time to achieve compound adjustment. After the rotating valve blade 11 is adjusted by sliding, the distance between it and the fixed valve blade 12 is increased, so that the rotating valve blade 11 has a larger rotation angle space, thereby enabling a larger range of throat flow area adjustment (e.g., Figure 9 (As shown).

[0030] The variable geometry turbine guide vane combined adjustment structure of this application divides the blades into fixed-lobe blades 12 and rotating-lobe blades 11, enabling the rotating-lobe blades 11 to possess both independent rotational and sliding motion capabilities, and allowing for the combination of these two motions. The rotating-lobe blades 11 actively increase the distance between themselves and the fixed-lobe blades 12 through sliding, providing greater space margin for rotation and thus breaking through the rotation angle limit of traditional segmented rotating adjustment structures. Simultaneously, since the rotating-lobe blades 11 and the fixed-lobe blades 12 always remain adjacent and together form a complete blade channel, the periodic disruption of the flow field caused by the alternating "dynamic and static" arrangement in translational sliding adjustment technology is avoided.

[0031] The segmented adjustable blade 1 includes a complete suction surface profile. During rotation, the suction surface profile remains complete and continuous, avoiding the sharp suction surface protrusions that occur with segmented blades during rotation and preventing flow separation losses caused by this. The leading edge of the fixed blade 12 is fixed, which solves the problem of increased angle-of-attack loss under varying operating conditions faced by adjustable blades. There is no radial clearance between the upper and lower ends of the fixed blade 12 and the guide vane I-shaped segmented housing 3, i.e., between it and the flow channel cross-section, which reduces the end-area leakage flow area and thus mitigates end-area leakage losses.

[0032] This application further proposes that the segmented adjustable blade 1 also includes a rotating column 13, which is fixed inside the rotating blade 11, rotatably connected to and passes through the sliding blade end wall 2, and connected to the adjustment mechanism to drive the rotating blade 11 to rotate and slide. Specifically, the rotating column 13 is a columnar structure fixed inside the rotating blade 11, extending radially along the rotating blade 11. After passing through the sliding blade end wall 2, the rotating column 13 extends to the outside and is connected to an external adjustment mechanism (e.g., a linkage mechanism, gear mechanism, or hydraulic actuation mechanism). The rotating column 13 and the sliding blade end wall 2 are rotatably connected, allowing the rotating column 13 to rotate freely relative to the sliding blade end wall 2. When the adjustment mechanism drives the rotating column 13 to rotate, the rotating column 13 drives the rotating blade 11 to rotate around its own axis; when the adjustment mechanism drives the rotating column 13 to slide, the rotating column 13 drives the rotating blade 11 and the rotatably connected sliding blade end wall 2 to slide together.

[0033] Through the above technical solution, the rotating column 13 is fixed inside the rotating blade 11 and passes through the sliding blade end wall 2 to connect with the adjustment mechanism, providing a reliable power transmission path for the rotation and sliding motion of the rotating blade 11. The rotational connection between the rotating column 13 and the sliding blade end wall 2 ensures the independence of the rotational motion, while the thrust transmission of the rotating column 13 to the sliding blade end wall 2 ensures the synchronization of the sliding motion, realizing effective control of both rotational and sliding motions by a single drive shaft.

[0034] This application further proposes a fixed-blade 12 comprising a leading edge and a pressure-faced front blade body, with the upper and lower sides of the fixed-blade 12 fixedly connected to the guide I-shaped splitting housing 3; and a rotating-blade 11 comprising a suction surface and a trailing edge blade body. Specifically, the fixed-blade 12 occupies the front region of the blade, including the leading edge (i.e., the inlet edge) and the pressure surface (i.e., the concave surface of the blade) of the front blade body. The upper and lower ends (i.e., the radial ends of the blade) of the fixed-blade 12 are fixedly connected to the guide I-shaped splitting housing 3, forming a fixed structure. The rotating-blade 11 occupies the rear region of the blade, including the suction surface (i.e., the convex surface of the blade) and the trailing edge (i.e., the outlet edge) blade body. The rotating-blade 11, as a movable part, adjusts the throat flow area by rotation and sliding. This splitting method divides the blade into aerodynamic functional zones, with the fixed-blade undertaking the main functions of incoming flow capture and airflow deflection, and the rotating-blade undertaking the adjustment functions of throat control and trailing edge discharge.

[0035] This application further proposes that the sliding blade end wall 2 includes: an end wall sealing plate 21, adapted to slide within the sliding space of the guide I-shaped split housing 3 and form a seal; a sealing ring 22 for sealing the gap between the rotating column 13 and the end wall sealing plate 21; and a cover plate 23, threadedly connected to the outside of the rotating column 13 for pressing the sealing ring 22.

[0036] Specifically, the end-wall sealing plate 21 is the main part of the sliding blade end wall 2. It has a thin, sheet-like structure that allows it to slide freely within the sliding space provided by the guide I-shaped segmented housing 3. During sliding, it forms a sealing fit with the guide I-shaped segmented housing 3 to prevent gas leakage. The sealing ring 22 is located in the gap between the rotating column 13 and the end-wall sealing plate 21, sealing the annular gap and preventing gas leakage along the rotating column 13. The sealing ring 22 can be a high-temperature resistant sealing form such as a graphite ring or an expansion ring seal. The cover plate 23 is threaded onto the outside of the rotating column 13. Tightening the cover plate 23 compresses the sealing ring 22, causing radial compression and axial and circumferential expansion of the sealing ring 22, thus achieving a reliable seal and preventing the sealing ring 22 from falling off during the rotation and sliding of the rotating column 13.

[0037] Through the above technical solution, the end wall 2 of the sliding blade forms a surface seal in the sliding space using an end wall sealing plate 21, seals the annular gap between the rotating column 13 and the end wall sealing plate 21 using a sealing ring 22, and presses the sealing ring 22 with a cover plate 23, thus constructing a multi-layer sealing structure. The end wall sealing plate 21 ensures end wall sealing during the sliding process, the sealing ring 22 ensures dynamic sealing at the penetration point of the rotating column 13, and the cover plate 23 ensures reliable positioning and pre-tightening of the sealing ring 22. The three work together to achieve reliable sealing of the end wall 2 of the sliding blade in motion.

[0038] This application further proposes that the guide I-shaped split housing 3 has a groove 32 inside, and the end wall sealing plate 21 is a thin sheet structure that can be inserted into the groove 32, forming a sealing structure with the upper and lower end faces of the groove 32. Specifically, the groove 32 is a slot-shaped space opened inside the guide I-shaped split housing 3, extending circumferentially along the housing. The thickness of the end wall sealing plate 21 is adapted to the groove 32. After the end wall sealing plate 21 is inserted into the groove 32, its upper and lower surfaces form a clearance fit or a small clearance fit with the upper and lower end faces of the groove 32, respectively, forming an end face sealing structure. When the end wall sealing plate 21 slides in the groove 32, its upper and lower surfaces always maintain contact and sealing with the upper and lower end faces of the groove 32.

[0039] The contact surfaces of the groove 32 and the end-wall sealing plate 21 are coated with a wear-resistant coating. Specifically, the wear-resistant coating is a functional coating applied to the upper and lower end faces of the groove 32 and / or the upper and lower surfaces of the end-wall sealing plate 21. The material can be a low-friction coefficient and high-wear-resistance material such as molybdenum disulfide, graphite, tungsten carbide, chromium nitride, or diamond-like carbon coating. The presence of the wear-resistant coating effectively reduces the coefficient of friction between the groove 32 and the end-wall sealing plate 21, reduces sliding resistance, and simultaneously improves the surface hardness and wear resistance of the contact surfaces, extending the service life of the sealing structure.

[0040] This application further proposes that the guide I-shaped segmented housing 3 includes a main body 31, and a recess 33 formed in the main body 31 provides space for the sliding of the rotating column 13. Specifically, the main body 31 is the main supporting structure of the guide I-shaped segmented housing 3, and its cross-section is I-shaped. The main body 31 forms a recess 33 at a position corresponding to the sliding path of the rotating column 13. The recess 33 is an opening or cavity area on the main body 31, providing the rotating column 13 with movement space in the sliding direction. When the rotating segment blade 11 slides integrally with the sliding blade end wall 2, the rotating column 13 moves synchronously with the rotating segment blade 11. The size and position of the recess 33 are designed to accommodate the entire position of the rotating column 13 in the maximum sliding stroke, ensuring that the rotating column 13 does not mechanically interfere with the housing body during the sliding process.

[0041] Through the above technical solution, the empty part 33 formed by the main body 31 of the guide I-shaped splitting housing 3 provides a dedicated space for the sliding of the rotating column 13, so that the rotating column 13 is not blocked by the housing structure when it drives the rotating blade 11 to slide, ensuring that the rotating blade 11 has sufficient sliding stroke, thereby realizing a wider range of throat position adjustment and rotation angle improvement.

[0042] This application further proposes that the guide I-shaped segmented housing 3 is arc-shaped, and multiple guide I-shaped segmented housings 3 can be joined together to form a circular structure; there are gaps between the upper and lower sides of the rotating petal blade 11 and the guide I-shaped segmented housing 3. Specifically, the guide I-shaped segmented housing 3 is an arc-shaped segmented structure, with each housing covering a certain central angle, and multiple housings can be joined together circumferentially to form a complete circular guide housing. There are gaps between the upper and lower sides of the rotating petal blade 11 (i.e., the radial ends of the blade) and the guide I-shaped segmented housing 3, which provide the necessary movement space for the rotation and sliding motion of the rotating petal blade 11, avoiding friction or interference between the blade and the housing during adjustment.

[0043] Through the above technical solution, the guide I-shaped segmented housing 3 adopts an arc-shaped segmented structure, and multiple housings can be enclosed to form a complete circular structure, which facilitates processing, assembly, and maintenance. The gap between the rotating blade 11 and the housing provides sufficient clearance for the rotation and sliding movement of the rotating blade 11, ensuring the smoothness of the adjustment action and avoiding motion interference. The circumferential curvature of the sliding blade end wall 2 matches the circumferential curvature of the guide I-shaped segmented housing 3, that is, their radii of curvature and central angles are basically the same. This curvature matching ensures that after the sliding blade end wall 2 is inserted into the sliding space of the guide I-shaped segmented housing 3, its outer surface maintains a uniform gap or contact state with the inner surface of the housing, which is conducive to the formation of the sealing structure and the smooth progress of the sliding movement.

[0044] This application proposes an adjustment method based on the above-mentioned variable geometry turbine guide combined adjustment structure, including: a split-type adjustable blade rotation adjustment method: the rotating blade 11 rotates relative to the fixed blade 12 to adjust the throat flow area; like Figure 7 As shown, in this embodiment, when the rotating petal blade 11 rotates to +2.5° ( Figure 3 The diagram shows the initial state (rotating vane 11 angle is 0°). Rotating vane 11 contacts the fixed vane 12, and the flow area reaches its maximum value for the segmented adjustable vane self-rotation adjustment mode, corresponding to a vane channel throat width of Xmax_1 = 7.3 mm. When rotating vane 11 rotates to -16.5°, the trailing edge of rotating vane 11 touches the adjacent rotating vane 11, and the adjustable vane flow reaches its minimum value, corresponding to a vane channel throat width of Xmin = 0 mm.

[0045] Integrated sliding adjustment method: The rotating petal blade 11 and the sliding blade end wall 2 slide together in the guide I-shaped petal splitting housing 3 to adjust the throat position; like Figure 8 As shown in this embodiment, after the rotating blade 11 slides integrally with the sliding blade end wall, the axial position of the corresponding blade throat moves back by 2mm, and the radial height of the blade throat section increases from Y_1=12mm to Y_2=12.4mm, corresponding to an increase of 3.3% in the throat flow area.

[0046] Integrated sliding and rotating adjustment method: The rotating valve blade 11 slides integrally with the sliding blade end wall 2. During the sliding process, the rotating valve blade 11 rotates to adjust the throat position and throat flow area. At the same time, the distance between the rotating valve blade 11 and the fixed valve blade 12 is increased to improve the rotatable angle of the rotating valve blade 11.

[0047] like Figure 9 As shown, in this embodiment, the rotating blade 11 slides integrally with the sliding blade end wall 2, that is, it slides 2mm axially and 3.5mm circumferentially. After this, the rotating blade 11 can continue to rotate to +10.5°. At this time, the rotating blade 11 contacts the fixed blade 12, and the flow area reaches the maximum value of the integral sliding and rotating adjustment method. The corresponding blade channel throat width is Xmax_2=10.6mm, which is 45.2% larger than Xmax_1.

[0048] If combined Figure 8 The expanded meridional channel 4 shown is used, and the integrated sliding and rotating adjustment method increases the radial height of the blade throat section from Y_1=12mm to Y_2=12.4mm, and the width of the blade channel throat from Xmax_1=7.3mm to Xmax_2=10.6mm. This can increase the flow area of ​​the guide throat by 50%, significantly improving the adjustment capability of the guide's maximum flow area.

[0049] Specifically, in the self-rotation adjustment method, the rotating blade 11 rotates relative to the fixed blade 12 around its own rotating column 13 axis. When the rotating blade 11 rotates in the opening direction, the throat flow area of ​​the blade channel increases; when it rotates in the closing direction, the throat flow area decreases. In the integrated sliding adjustment method, the rotating blade 11 and the sliding blade end wall 2 slide as a whole along the sliding space of the guide I-shaped splitting housing 3, changing the position of the throat in the channel; inside the expanding meridional channel 4, by changing the position of the throat inside the channel, the purpose of changing the throat flow area is achieved (e.g., Figure 8(As shown). In the integrated sliding-rotation adjustment method, sliding and rotation are performed simultaneously. The rotating blade 11 rotates while sliding, and the sliding moves the rotating blade 11 away from the fixed blade 12, increasing the distance between them. This provides more space for the rotating blade 11 to rotate, enabling it to reach a larger rotation angle, thereby achieving a larger throat flow area adjustment range than the pure self-rotation adjustment method.

[0050] The above technical solutions clarify the specific operation methods and functional positioning of the three adjustment methods. Self-rotation adjustment achieves the adjustment of the throat flow area, integrated sliding adjustment achieves the adjustment of the throat position, and integrated sliding rotation adjustment increases the blade spacing through sliding, thereby achieving a larger angle of rotation. The combination of the three methods can make the adjustment range of the throat flow area far exceed that of a single adjustment method, significantly improving the throat adjustment capability of the variable geometry turbine guide.

[0051] The following example will provide a more detailed explanation of the above technical solution: In the design of a certain variable cycle aero-engine, in order to meet the requirement of the turbine guide vane to have a significantly adjustable throat flow area, the rotation angle of the traditional segmented rotary adjustment structure is limited by the mechanical interference between the fixed and rotating segments, which cannot meet the requirements of advanced engines for ultra-high flow rate limits; while the adjustment capability of the translational sliding adjustment structure is also relatively poor, and it will disrupt the periodicity of the flow field.

[0052] This application proposes a variable geometry turbine guide combined adjustment structure. The turbine guide consists of multiple guide I-shaped segmented housings 3 enclosing each other in a circumferential direction to form a complete ring, with each housing corresponding to a blade channel. The segmented adjustable blades 1 in each channel consist of fixed-lobe blades 12 and rotating-lobe blades 11.

[0053] When a smaller throat flow area is required, the adjusting mechanism drives the rotating column 13 to rotate, and the rotating valve blade 11 rotates relative to the fixed valve blade 12 in the closing direction, reducing the throat flow area of ​​the blade channel. At the same time, the rotating valve blade 11 does not slip with the sliding blade end wall 2, and remains at a small distance from the fixed valve blade 12.

[0054] When a significant increase in the throat flow area is required to increase turbine flow, the regulating mechanism first drives the rotating column 13 to slide. The rotating column 13 drives the rotating blade 11 and the rotatably connected sliding blade end wall 2 to slide together within the guide I-shaped split casing 3. The end wall sealing piece 21 of the sliding blade end wall 2 slides within the groove 32 of the casing, and its upper and lower surfaces maintain sealed contact with the end face of the groove 32. The applied wear-resistant coating ensures smooth sliding and durable sealing.

[0055] Sliding moves the rotating blade 11 away from the fixed blade 12, increasing the distance between them and providing greater space for rotation. Simultaneously with the sliding, the adjusting mechanism continues to drive the rotating column 13 to rotate, causing the rotating blade 11 to rotate further in the opening direction from its position away from the fixed blade 12. Since the sliding eliminates the risk of mechanical interference between the rotating blade 11 and the fixed blade 12, the rotating blade 11 can achieve a larger rotation angle than with pure self-rotation adjustment.

[0056] Throughout the rotation and sliding of the rotating blade 11, the sliding blade end wall 2 moves integrally with the rotating blade 11. The end wall sealing plate 21 slides within the groove 32, maintaining a seal. The sealing ring 22, under the pressure of the cover plate 23, seals the gap between the rotating column 13 and the end wall sealing plate 21, ensuring the reliability of the pneumatic seal. The empty portion 33 of the main body 31 of the guide I-shaped splitting housing 3 provides sufficient space for the sliding of the rotating column 13, avoiding mechanical interference.

[0057] The terms “first” and “second” are used to distinguish similar objects, not to describe or indicate a specific order or sequence.

[0058] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0059] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A variable geometry turbine guide assembly adjustment structure, characterized in that, include: The split-type adjustable blade (1) includes a fixed blade (12) and a rotating blade (11). The sliding blade end wall (2) is rotatably connected to the rotating petal blade (11); as well as The guide I-shaped split housing (3) provides sliding space for the end wall (2) of the sliding blade; The rotating blade (11) is configured as follows: The fixed leaflet (12) is rotated relative to the fixed leaflet to change the throat flow area of ​​the leaflet channel; The sliding blade end wall (2) is integrally slidably adjusted inside the guide I-shaped split casing (3); While sliding integrally with the sliding blade end wall (2), it is rotated relative to the fixed blade (12); and After the integrated sliding adjustment, the distance between the fixed petal blade (12) and the fixed petal blade is increased to improve the rotatable angle.

2. The variable geometry turbine guide assembly adjustment structure according to claim 1, characterized in that, The segmented adjustable blade (1) also includes a rotating column (13), which is fixed inside the rotating blade (11), rotatably connected and passes through the end wall (2) of the sliding blade to the adjustment mechanism, and is used to drive the rotating blade (11) to rotate and slide.

3. The variable geometry turbine guide assembly adjustment structure according to claim 1, characterized in that, The fixed-edge blade (12) includes a blade leading edge and a pressure-faced blade body, and the upper and lower sides of the fixed-edge blade (12) are fixedly connected to the guide I-shaped splitting casing (3); the rotating-edge blade (11) includes a blade suction surface and a trailing edge blade body.

4. The variable geometry turbine guide assembly adjustment structure according to claim 2, characterized in that, The sliding blade endwall (2) includes: The end-wall sealing piece (21) is adapted to slide within the sliding space of the guide I-shaped split housing (3) and form a seal; Sealing ring (22) for sealing the gap between the rotating column (13) and the end wall sealing plate (21); and The cover plate (23), threaded to the outside of the rotating column (13), is used to press the sealing ring (22).

5. The variable geometry turbine guide assembly adjustment structure according to claim 4, characterized in that, The guide I-shaped split housing (3) has a groove (32) inside. The end wall sealing plate (21) is a thin sheet structure that can be inserted into the groove (32) and forms a sealing structure with the upper and lower end faces of the groove (32).

6. The variable geometry turbine guide assembly adjustment structure according to claim 5, characterized in that, The contact surfaces of the groove (32) and the end wall sealing piece (21) are coated with a wear-resistant coating.

7. The variable geometry turbine guide assembly adjustment structure according to claim 2, characterized in that, The guide I-shaped split housing (3) includes a main body (31), and the empty part (33) formed by the main body (31) provides space for the sliding of the rotating column (13).

8. The variable geometry turbine guide assembly adjustment structure according to claim 1, characterized in that, The guide I-shaped splitting housing (3) is arc-shaped, and multiple guide I-shaped splitting housings (3) can be enclosed to form a ring structure; there is a gap between the upper and lower sides of the rotating petal blade (11) and the guide I-shaped splitting housing (3).

9. The variable geometry turbine guide assembly adjustment structure according to claim 8, characterized in that, The curvature of the sliding blade end wall (2) is adapted to the curvature of the guide I-shaped split casing (3).

10. An adjustment method based on the variable geometry turbine guide combined adjustment structure according to any one of claims 1-9, characterized in that, include: Split-type adjustable blade rotation adjustment method: The rotating blade (11) rotates relative to the fixed blade (12) to adjust the throat flow area; Integrated sliding adjustment method: The rotating petal blade (11) and the sliding blade end wall (2) slide together in the guide I-shaped petal splitting housing (3) to adjust the throat position; Integrated sliding and rotating adjustment method: The rotating valve blade (11) slides integrally with the sliding blade end wall (2), and during the sliding process, the rotating valve blade (11) rotates to adjust the throat position and throat flow area, while increasing the distance between the rotating valve blade (11) and the fixed valve blade (12) to increase the rotatable angle of the rotating valve blade (11).

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