An S-bend nozzle with a deformation suppression structure and its application

Abstract

The present invention provides an S-bend nozzle with a deformation suppression structure and its application, which belongs to the field of aero-engines; the S-bend nozzle is divided into a nozzle convergent section and a straight section such as the nozzle outlet along the axial direction; the upper and lower wall surfaces of the S-bend nozzle are both provided with a deformation suppression structure, the outer contour of the deformation suppression structure is U-shaped, the top opening of the U-shape is located at the upper and lower outer edges of the outlet of the straight section such as the nozzle outlet, and its central axis is located on the symmetry plane of the S-bend nozzle. The openings of the deformation suppression structure, that is, the upper and lower outer edges of the outlet of the straight section such as the nozzle outlet, are both provided with local transverse ribs; the local transverse ribs are connected to the two ends of the U-shape, and the midpoint is located on the central axis of the U-shape. The S-bend nozzle using the technical solution of the present invention can effectively suppress the local deformation and overall deformation of the S-bend nozzle by arranging the deformation suppression structure at an appropriate position on the nozzle structure and reasonably designing the size of the continuous ribs.

Description

Technical Field

[0001] The present invention belongs to the field of aero-engines, and in particular relates to an S-bend nozzle with a deformation suppression structure and its application. Background Art

[0002] The S-bend nozzle is a key component in achieving stealth aircraft, characterized by its large size, thinness, and complex surface curvature. In actual operation, the complex aerodynamic pressure and thermal loads within the nozzle cause complex structural deformation. This deformation can lead to a decrease in the nozzle's aerodynamic performance and, in severe cases, even structural damage. Therefore, using appropriate structures and methods to suppress this deformation is a crucial consideration during the design and application of S-bend nozzles.

[0003] At present, web-type structures are mostly used in engineering to suppress the structural deformation of the engine tail nozzle. However, web-type structures are prone to problems of heavy structural weight and large structural size. At the same time, the large-area web installed on the tail nozzle will bring additional technical problems and design challenges in terms of nozzle structure heat dissipation, structural vibration, and structural buckling failure.

[0004] Rib structures are also a common structural reinforcement method for large, thin-walled components such as nozzles in the aerospace industry. However, current rib design methods for engineering applications are relatively simple, meaning that optimization of rib layout and dimensions is relatively rare. In the design of S-bend nozzles, engineers currently explore deformation suppression by varying the overall wall thickness of the nozzle structure. Research and application of rib structures in this area are limited, and there are no publicly available results on optimizing the layout and dimensions of rib structures in S-bend nozzles. Summary of the Invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention provides an S-bend nozzle with a deformation suppression structure. By analyzing the deformation mode of the S-bend nozzle, it is found that the deformation of the S-bend nozzle is a combination of local convex deformation and overall upward deformation of the rear half. Therefore, deformation suppression structures with specific structures and specific positions are arranged on the upper and lower walls of the nozzle to effectively suppress the structural deformation of the S-bend nozzle during use.

[0007] The technical solution of the present invention is: an S-bend nozzle with a deformation suppression structure, which is divided into a nozzle convergent section 1 and a straight section 2 at the nozzle outlet along the axial direction; the upper and lower wall surfaces of the S-bend nozzle are both provided with a deformation suppression structure, and the outer contour of the deformation suppression structure is U-shaped, and the U-shaped top opening is located at the upper and lower outer edges of the outlet of the straight section 2 at the nozzle outlet, and its central axis is located on the symmetry plane of the S-bend nozzle.

[0008] A further technical solution of the present invention is that local transverse ribs are provided at the opening of the deformation suppression structure, i.e., the upper and lower outer edges of the outlet of the straight section 2 such as the nozzle outlet; the local transverse ribs are connected to the two ends of the U-shape, and the midpoint is located on the central axis of the U-shape, and its length is 85% to 95% of the width of the S-bend nozzle outlet.

[0009] A further technical solution of the present invention is: the first deformation suppression structure is located on the upper wall of the S-bend nozzle. The first deformation suppression structure is a U-shaped continuous rib, which includes a first parallel section 3, a first convergent section 4 and a first arc section 5 in the axial direction. The length of the first parallel section 3 is L u1 , the length of the first convergent segment 4 is L u2 , the distance between the two symmetrical first parallel segments 3 is D u The continuous ribs of the first deformation suppression structure converge from the starting point of the first convergent section 4 to the central axis as a whole; the two ends of the first arc segment 5 are tangent to the ends of the two first convergent sections 4, and the arc length L u3 It is determined by two dimensions: the spacing between the first parallel sections 3 and the cross-sectional width of the continuous ribs on the upper wall.

[0010] A further technical solution of the present invention is that the radial distance of convergence of the first convergent section 4 from the starting point to the end point is equal to the cross-sectional width of the two upper wall continuous ribs.

[0011] A further technical solution of the present invention is that the first deformation suppression structure further includes a first transverse rib 11 , and the ends of the two first parallel sections 3 are connected by the first transverse rib 11 .

[0012] A further technical solution of the present invention is: the second deformation suppression structure is located on the lower wall of the S-bend nozzle, and the second deformation suppression structure is a U-shaped continuous rib, which includes a second parallel section 6, a second convergent section 7 and a second arc section 8 in the axial direction. The length of the second parallel section 6 is L d1 , the length of the second convergent section 7 is L d2 The distance between the two symmetrical second parallel segments 6 is D l The second deformation-suppressed continuous ribs converge from the second convergent section 7 as a whole to the central axis; the two ends of the second arc segment 8 are tangent to the ends of the two second convergent sections 7, and the arc length L d3 It is determined by the spacing of the second parallel sections 6 and the cross-sectional width of the continuous ribs on the lower wall.

[0013] A further technical solution of the present invention is that the radial distance of convergence of the second convergent section 7 from the starting point to the end point is equal to the cross-sectional width of the two continuous ribs on the lower wall.

[0014] A further technical solution of the present invention is: the second deformation suppression structure also includes a second transverse rib 12 and a third transverse rib 13, the two second parallel sections 6 are connected by the second transverse rib 12, and the two second convergent sections 7 are connected by the third transverse rib 13; the axial distance between the second transverse rib 12 and the nozzle outlet end is 34% to 36% of the total axial length of the nozzle; the axial distance between the third transverse rib 13 and the nozzle outlet end is 56% to 60% of the total axial length of the nozzle.

[0015] A further technical solution of the present invention is: it also includes a first ear piece and a second ear piece, which are connected to the external support structure, and the four first ear pieces are respectively arranged at the intersection of the local transverse ribs and the U-shaped continuous ribs on the upper and lower walls, and the two second ear pieces are respectively arranged in the middle of the first transverse rib 11 and the second transverse rib 12.

[0016] An application of an S-bend nozzle with a deformation suppression structure, wherein the S-bend nozzle with a deformation suppression structure is applied to a turbine engine, wherein the inlet end is the front end of the nozzle convergent section 1, connected to the outlet of the turbine engine; the outlet end is the end of the nozzle outlet straight section 2;

[0017] The width and height of the U-shaped continuous rib section of the deformation suppression structure are 5 to 30 mm;

[0018] The length of the first parallel section 3 of the upper wall of the nozzle is 36% to 40% of the total length of the nozzle, and the length of the first convergent section 4 is 20% to 22% of the total length of the nozzle; the length of the second parallel section 6 of the continuous rib on the lower wall of the nozzle is 40% to 45% of the total length of the nozzle, and the length of the second convergent section 7 is 18% to 20% of the total length of the nozzle;

[0019] The distance between the two first parallel sections 3 on the upper wall of the nozzle is 18% to 20% of the total length of the nozzle, and the distance between the two second parallel sections 6 on the lower wall is 8% to 10% of the total length of the nozzle.

[0020] Beneficial effects

[0021] The beneficial effects of the present invention are as follows: the S-bend nozzle using the technical solution of the present invention can effectively suppress the local and overall deformation of the S-bend nozzle by arranging deformation suppression structures at appropriate positions on the nozzle structure and rationally designing the dimensions of the continuous ribs. The technical difficulty of the present invention lies in the targeted arrangement of ribs on the nozzle structure based on the characteristics of the deformation pattern of the S-bend nozzle, and suppressing the overall and local deformation of the nozzle by increasing the overall and local stiffness of the nozzle structure. At the same time, the S-bend nozzle of the technical solution of the present invention has obvious structural weight and size advantages compared to the web-type support constraint frame commonly used in engineering.

[0022] When the width of the continuous rib is 30 mm and the height is 15 mm, the deformation of the S-bend nozzle without and with ribs is calculated using the finite element method. The deformation distribution cloud diagrams of the two nozzle structures are shown in Figure 2. Figure 5-8 The analysis and calculation results show that relying solely on the rib structure to suppress nozzle deformation can reduce the maximum nozzle deformation by 64.93%. When the normal deformation of the local structure is restricted at the lug, the maximum nozzle deformation can be further reduced, with a maximum reduction of 84.53% compared to the nozzle without the rib structure. This proves the effectiveness of the rib structure designed in this invention.

[0023] When a traditional web-type structure is used to suppress S-bend nozzle deformation, with the web thickness at all locations being 3mm and structural deformation constrained at the web edges, the maximum deformation of the nozzle structure is 2.69mm, and the overall structural weight of the web-type S-bend nozzle is 35.01kg. It can be seen that the maximum deformation of the S-bend nozzle with a rib structure designed in the technical solution of the present invention is 63.94% of that of the web-type nozzle, and the structural weight is 58.38% of that of the web-type nozzle. In other words, the technical solution of the present invention not only reduces the structural deformation of the S-bend nozzle, but also, because the rib structure is attached to the nozzle structure, the rib-type S-bend nozzle of the technical solution of the present invention has significant advantages in terms of structural weight and structural size.

[0024] Comparison between the technical solution of the present invention and the web-type structure when adding local constraints

[0025] BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of an S-bend nozzle with a reinforcing rib structure, which can be selected according to an embodiment of the present invention;

[0027] Figure 2 is a top view of an optional S-bend nozzle with a reinforcing rib structure according to an embodiment of the present invention;

[0028] Figure 3 3. This is a bottom view of an optional S-bend nozzle with a reinforcing rib structure according to an embodiment of the present invention;

[0029] Figure 4 is a front view of an optional S-bend nozzle with a reinforcing rib structure according to an embodiment of the present invention;

[0030] Figure 5 This is the deformation distribution cloud diagram of the S-bend nozzle without the reinforcement structure;

[0031] Figure 6 This is the deformation distribution cloud diagram of the S-bend nozzle with a rib structure;

[0032] Figure 7 It is the deformation distribution cloud diagram of the S-bend nozzle after constraining the local normal deformation at the lug;

[0033] Figure 8 This is the deformation distribution cloud diagram of the traditional web-type S-bend nozzle;

[0034] Explanation of the accompanying symbols: 1. nozzle convergent section; 2. straight section at the nozzle outlet; 3. first parallel section of the continuous ribs on the upper wall; 4. first convergent section of the continuous ribs on the upper wall; 5. first arc section of the continuous ribs on the upper wall; 6. second parallel section of the continuous ribs on the lower wall; 7. second convergent section of the continuous ribs on the lower wall; 8. second arc section of the continuous ribs on the lower wall; 9. local transverse ribs at the outlet end of the upper wall; 10. local transverse ribs at the outlet end of the lower wall; 11. first transverse ribs on the upper wall; 12. second transverse ribs on the lower wall; 13. third transverse ribs on the lower wall; 14. ear pieces on the local transverse ribs at the outlet end of the nozzle; 15. ear pieces on the transverse ribs. DETAILED DESCRIPTION

[0035] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] The present invention provides an S-bend nozzle with a deformation suppression structure. By analyzing the deformation mode of the S-bend nozzle, it is found that the deformation of the S-bend nozzle is a combination of local convex deformation and overall upward deformation of the rear half. Therefore, deformation suppression structures with specific structures and specific positions are arranged on the upper and lower walls of the nozzle to effectively suppress the structural deformation generated by the S-bend nozzle during use.

[0038] The S-bend nozzle with a reinforcing rib structure comprises a nozzle convergent section 1, a straight nozzle section 2, U-shaped continuous ribs, local transverse ribs, transverse ribs, and tabs. Analysis of the deformation pattern of the S-bend nozzle revealed that the deformation is a combination of local convex deformation and overall upward deformation of the rear half. Therefore, two continuous ribs are arranged on the upper and lower walls of the nozzle, two local transverse ribs are arranged on the upper and lower walls of the straight nozzle outlet section, one transverse rib is arranged on the upper wall of the rear section of the nozzle convergent section, and two transverse ribs are arranged on the lower wall of the middle section of the nozzle convergent section.

[0039] The U-shaped continuous ribs are a reinforcing rib structure starting from the nozzle outlet and extending forward (looking from the nozzle outlet to the nozzle inlet) to the first bend of the nozzle. The continuous ribs are composed of parallel sections, convergent sections and arc sections.

[0040] Preferably, the cross-sectional width and height of the continuous ribs are recommended to be 5 to 30 mm. These parameters can be optimized based on the deformation suppression requirements of the S-bend nozzle. The parallel section length of the continuous ribs on the upper wall of the nozzle is 36% to 40% of the total nozzle length, and the length of the convergent section is 20% to 22% of the total nozzle length. After passing through the convergent section, the overall spacing of the continuous ribs on the upper wall converges inward by the distance of two upper wall rib widths. The arc section is tangent to the convergent section, so its arc length is determined by the other upper wall continuous rib dimensional parameters mentioned above. The parallel section length of the continuous ribs on the lower wall of the nozzle is 40% to 45% of the total nozzle length, and the length of the convergent section is 18% to 20% of the total nozzle length. After passing through the convergent section, the overall spacing of the continuous ribs on the lower wall converges inward by the distance of two lower wall rib widths. The arc section is tangent to the convergent section, so its arc length is determined by the other lower wall continuous rib dimensional parameters. In this technical solution, the length of the parallel section of the continuous rib is designed to effectively cover the straight sections such as the nozzle outlet and the rear half of the nozzle convergence section, thereby improving the overall structural rigidity of the nozzle and achieving better overall deformation suppression. The continuous rib convergence section is designed to reduce and control the arc length and radius, allowing the continuous rib arc section to pass through the localized deformation of the front half of the nozzle convergence section to suppress local deformation. This position and size design can balance the continuous rib's effect on suppressing both overall and local deformation of the nozzle structure.

[0041] Preferably, the spacing between the parallel sections of the continuous ribs on the upper and lower walls of the nozzle is unequal, with the spacing between the parallel sections of the continuous ribs on the upper wall being approximately 18% to 20% of the total length of the nozzle, and the spacing between the parallel sections of the continuous ribs on the lower wall being approximately 8% to 10% of the total length of the nozzle. In this technical solution, the unequal spacing between the parallel sections of the continuous ribs on the upper and lower walls is the result of an optimized design. The optimization results show that the spacing between the parallel sections of the continuous ribs on the upper wall is greater than that of the parallel sections of the continuous ribs on the lower wall, and is approximately twice the spacing. This is beneficial for achieving a better overall deformation suppression effect of the S-bend nozzle structure while reducing the structural weight of the nozzle, because the size of the continuous ribs on the lower wall is reduced overall after optimization, while the deformation suppression effect of the S-bend nozzle structure is not significantly affected.

[0042] Preferably, the length of the local transverse ribs on the upper and lower walls of the nozzle outlet is 85% to 95% of the width of the nozzle outlet section. They are closely attached to the nozzle outlet and connected to the continuous ribs on the upper and lower walls. Their height and width are consistent with the height and width of the continuous ribs they connect to. In this technical solution, since the local deformation of the S-bend nozzle outlet is a deformation mode in which the wall surface bulges outward along the normal direction, the design of such local transverse ribs at the outlet can effectively increase the local stiffness of the nozzle in the straight section, thereby suppressing local deformation of the nozzle outlet.

[0043] Preferably, the first transverse rib on the upper wall of the rear section of the nozzle convergent section is located at the end of the parallel section of the continuous rib on the upper wall and is connected to the continuous rib on the upper wall. Its height and width are consistent with the height and width of the continuous rib on the upper wall.

[0044] Preferably, the two transverse ribs on the nozzle's lower wall are axially spaced 34% to 36% and 56% to 60% of the nozzle's total length from the nozzle's outlet, respectively. They connect to the parallel and convergent sections of the continuous ribs on the lower wall, respectively, and their height and width are consistent with those of the continuous ribs on the lower wall. In this technical solution, the axial position of the local transverse ribs is determined by the local deformation distribution of the S-bend nozzle. Designing the local transverse ribs within this range will cause them to coincide with locations of significant local deformation, effectively suppressing local deformation.

[0045] Preferably, the tabs are located at the center of the local transverse ribs on the upper wall of the rear section of the nozzle convergent section, at the center of the local transverse ribs on the lower wall of the middle section of the nozzle convergent section, and at the intersection of the local transverse ribs and the continuous ribs at the nozzle outlet, and are perpendicular to the local transverse ribs in which they are located. The tabs have circular holes for connection to the external structure via pins and other components. The diameter of the circular holes is 20 mm. The dimensions of the tabs and circular holes can be adjusted according to actual project needs.

[0046] Preferably, the structural deformation of the S-bend nozzle can be further suppressed by applying constraints at the lugs. The constraints imposed are recommended to limit the local normal deformation of the structure at the lugs, while allowing the structure to deform in the axial and lateral directions. Under such constraints, the structural deformation of the nozzle can be further reduced, and the structural stress of the nozzle will not increase significantly. In this technical solution, the design of the constraints at the lugs of the S-bend nozzle is determined by the deformation response and stress-strain response characteristics under the action of thermal loads and pressure loads in the working state of the nozzle. The local deformation of the S-bend nozzle is mainly the convex deformation of the structure along the normal direction. At the same time, if the displacement and deformation degrees of freedom in all three directions are constrained at the lugs, it will cause the nozzle to generate large thermal stress. Therefore, after comprehensive consideration, it is chosen to only constrain the normal deformation of the structure at the lugs, while relaxing the constraints on axial and lateral deformations, taking into account the deformation suppression effect of the S-bend nozzle and the design requirement of low stress level.

[0047] The technical solution is further described below with reference to embodiments.

[0048] like Figure 1-4 As shown, this embodiment shows an S-bend nozzle with a ribbed structure, comprising a converging nozzle section 1, a straight section 2 extending from the nozzle outlet, upper wall continuous rib components 3, 4, and 5, lower wall continuous rib components 6, 7, and 8, local transverse ribs 9 and 10 on the upper and lower nozzle outlet walls, a first transverse rib 11 on the upper nozzle wall, second and third transverse ribs 12 and 13 on the lower nozzle wall, and tabs 14 and 15 located on the local transverse ribs. These continuous ribs and local transverse ribs together constitute the S-bend nozzle's ribbed structure, which improves both the overall and local stiffness of the S-bend nozzle structure, thereby suppressing nozzle deformation during operation.

[0049] Furthermore, in this embodiment, the total length of the nozzle is 1054 mm, the width of the rib is 30 mm, and the height is 15 mm.

[0050] Specifically, the continuous ribs on the upper wall of the S-bend nozzle with a reinforcing rib structure are composed of a parallel section 3, a convergent section 4 and an arc section 5. In this embodiment, the axial length of the parallel section 3 is 405 mm, and the spacing is 150 to 250 mm, which is 200 mm in this embodiment; the axial length of the convergent section 4 is 220 mm, and the continuous ribs on the upper wall converge inward as a whole after passing through the convergent section 4 by the distance of the width of two upper wall ribs, that is, the end spacing of the convergent section 4 is 140 mm; the arc section 5 is tangent to the convergent section 4, so its size is determined by the other sizes mentioned above.

[0051] Specifically, the continuous ribs on the lower wall of the S-bend nozzle with a reinforcing rib structure are composed of a parallel section 6, a convergent section 7 and an arc section 8. In this embodiment, the axial length of the parallel section 6 is 445 mm, and the spacing is 60 to 120 mm, which is 100 mm in this embodiment; the axial length of the convergent section 7 is 202 mm, and the continuous ribs on the lower wall converge inward as a whole after passing through the convergent section 7 by the distance of two lower wall rib widths, that is, the end spacing of the convergent section 7 is 40 mm; the arc section 8 is tangent to the convergent section 7, so its size is determined by the other sizes mentioned above.

[0052] Specifically, in this embodiment, the width and height of the local transverse ribs 9 on the upper wall of the outlet end of the S-bend nozzle with a reinforcing rib structure are consistent with the parallel section 3 connected thereto, and its length is slightly smaller than the width of the nozzle outlet end, which is 480-520 mm.

[0053] Specifically, in this embodiment, the width and height of the local transverse rib 10 on the lower wall of the outlet end of the S-bend nozzle with a reinforcing rib structure are consistent with the parallel section 6 connected thereto, and its length is slightly smaller than the width of the nozzle outlet end, which is 480-520 mm.

[0054] Specifically, in this embodiment, the local transverse rib 11 on the upper wall of the S-bend nozzle with a reinforcing rib structure is located at the end of the parallel section 3 and is connected to the parallel section 3. Its width and height are consistent with the width and height of the parallel section 3 connected to it, and its length is 200 mm, the spacing between the parallel sections 3.

[0055] Specifically, in this embodiment, the local transverse ribs 12 and 13 on the lower wall of the S-bend nozzle with a reinforcing rib structure are located at the parallel section 6 and the convergent section 7, respectively, and their axial distances from the nozzle outlet end are 315 mm and 595 mm, respectively. Their width and height are consistent with the parallel section 6 and the convergent section 7 connected to them, and their lengths are 100 mm and 64 mm, respectively.

[0056] Specifically, in this embodiment, there are four lugs 14, which are located at the intersection of the transverse ribs 9, 10 and the continuous rib parallel sections 3, 6 of the upper and lower walls. There are two lugs 15, which are located in the middle of the local transverse ribs 11, 12. The lugs are perpendicular to the local transverse ribs where they are located. Figure 4 θ in u and θ l The recommended angle is 90°. A circular hole with a diameter of 20 mm is opened on the ear piece, which is used to connect with external components such as pins to suppress the normal deformation of the local structure at the ear piece.

[0057] Specifically, in this embodiment, the normal deformation of the local structure of the nozzle can be constrained at the ears 14 and 15, allowing the structure to deform in the axial and lateral directions. This can further reduce the structural deformation of the S-bend nozzle without significantly increasing the structural stress of the nozzle.

[0058] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An S-bend nozzle with a deformation suppression structure, characterized by: The nozzle is divided into a nozzle convergent section (1) and a nozzle outlet straight section (2) along the axial direction; the upper and lower wall surfaces of the S-bend nozzle are both provided with a deformation suppression structure, the outer contour of the deformation suppression structure is U-shaped, the top opening of the U-shaped is located at the upper and lower outer edges of the nozzle outlet straight section (2), and the central axis thereof is located on the symmetry plane of the S-bend nozzle; The first deformation suppression structure is located on the upper wall of the S-bend nozzle. The first deformation suppression structure is a U-shaped continuous rib, which includes a first parallel section (3), a first convergent section (4) and a first arc section (5) in the axial direction. The length of the first parallel section (3) is , the length of the first convergent segment (4) is , the distance between the two symmetrical first parallel segments (3) is The continuous ribs of the first deformation suppression structure converge from the starting point of the first convergent section (4) to the central axis as a whole; the two ends of the first arc section (5) are tangent to the ends of the two first convergent sections (4) respectively, and the arc length It is determined by two dimensions: the spacing between the first parallel segments (3) and the cross-sectional width of the continuous ribs on the upper wall.

2. The S-bend nozzle with a deformation suppression structure according to claim 1, characterized in that: The opening of the deformation suppression structure, i.e., the upper and lower outer edges of the outlet of the straight section (2) of the nozzle outlet, are provided with local transverse ribs; the local transverse ribs are connected to the two ends of the U-shape, and the midpoint is located on the central axis of the U-shape, and the length thereof is 85% to 95% of the width of the S-bend nozzle outlet.

3. The S-bend nozzle with a deformation suppression structure according to claim 2, characterized in that: The radial distance of convergence of the first convergent section (4) from the starting point to the end point is equal to the cross-sectional width of the two upper wall continuous ribs.

4. The S-bend nozzle with a deformation suppression structure according to claim 3, characterized in that: The first deformation suppression structure further comprises a first transverse rib (11), and the ends of the two first parallel sections (3) are connected via the first transverse rib (11).

5. The S-bend nozzle with a deformation suppression structure according to claim 4, characterized in that: The second deformation suppression structure is located on the lower wall of the S-bend nozzle. The second deformation suppression structure is a U-shaped continuous rib, which includes a second parallel section (6), a second convergent section (7) and a second arc section (8) in the axial direction. The length of the second parallel section (6) is , the length of the second convergent segment (7) is , the distance between the two symmetrical second parallel segments (6) is ; The continuous ribs for the second deformation suppression converge from the starting point of the second convergent section (7) to the central axis as a whole; the two ends of the second arc section (8) are tangent to the ends of the two second convergent sections (7) respectively, and the arc length is It is determined by two dimensions: the spacing of the second parallel segments (6) and the cross-sectional width of the continuous ribs on the lower wall.

6. The S-bend nozzle with a deformation suppression structure according to claim 5, characterized in that: The radial distance of convergence of the second convergent section (7) from the starting point to the end point is equal to the cross-sectional width of the two continuous ribs on the lower wall.

7. The S-bend nozzle with a deformation suppression structure according to claim 6, characterized in that: The second deformation suppression structure further includes a second transverse rib (12) and a third transverse rib (13), wherein the two second parallel sections (6) are connected by the second transverse rib (12), and the two second convergent sections (7) are connected by the third transverse rib (13); the axial distance between the second transverse rib (12) and the nozzle outlet end is 34% to 36% of the total axial length of the nozzle; and the axial distance between the third transverse rib (13) and the nozzle outlet end is 56% to 60% of the total axial length of the nozzle.

8. The S-bend nozzle with a deformation suppression structure according to claim 5, characterized in that: It also includes a first ear piece and a second ear piece, which are connected to the external support structure. The four first ear pieces are respectively arranged at the intersection of the local transverse ribs and the U-shaped continuous ribs on the upper and lower walls, and the two second ear pieces are respectively arranged in the middle of the first transverse rib (11) and the second transverse rib (12).

9. An application of the S-bend nozzle with a deformation suppression structure according to any one of claims 1 to 8, characterized in that: The S-bend nozzle with the deformation suppression structure is applied to a turbine engine, wherein the inlet end is the front end of the nozzle convergent section (1) connected to the outlet of the turbine engine; the outlet end is the end of the nozzle outlet straight section (2); The width and height of the U-shaped continuous rib section of the deformation suppression structure are 5 to 30 mm; The length of the first parallel section (3) of the upper wall of the nozzle is 36% to 40% of the total length of the nozzle, and the length of the first convergent section (4) is 20% to 22% of the total length of the nozzle; the length of the second parallel section (6) of the continuous rib on the lower wall of the nozzle is 40% to 45% of the total length of the nozzle, and the length of the second convergent section (7) is 18% to 20% of the total length of the nozzle; The distance between the two first parallel sections (3) on the upper wall of the nozzle is 18% to 20% of the total length of the nozzle, and the distance between the two second parallel sections (6) on the lower wall is 8% to 10% of the total length of the nozzle.

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