Double-wall cooling combined suction surface adjustable guide vane structure

Abstract

The invention discloses a suction surface adjustable guide vane structure combined with double-layer wall cooling, which comprises a fixed pressure surface, an adjustable suction surface and a driving device used for driving the adjustable suction surface to rotate, the adjustable suction surface is rotatably mounted on the fixed pressure surface through a rotating shaft, and the fixed pressure surface and the adjustable suction surface surround to form a cavity. A first opening and a second opening which are oppositely arranged are formed in the wall surface of the fixed pressure surface, a double-wall cooling structure is arranged on the adjustable suction surface, the double-wall cooling structure comprises an inner wall and an outer wall, the inner wall and the outer wall surround to form a cooling cavity, the inner wall is close to one side of the fixed pressure surface, an air inlet hole is formed in the inner wall, and an air outlet hole is formed in the outer wall. Exhaust holes are formed in the outer wall, and turbulent flow columns are arranged between the inner wall and the outer wall. The double-wall cooling structure is reasonably arranged, heat convection is achieved, the turbulent flow columns are arranged for turbulent flow heat exchange, the heat exchange efficiency is improved, the cooling effect of the adjustable suction surface is enhanced, and the overall cooling performance of the blade is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine blade cooling for variable cycle engines, and particularly to a suction surface adjustable guide vane structure combined with double-wall cooling. Background Art

[0002] Compared with traditional aero-engines, variable cycle engines have significantly improved in terms of maximum thrust, fuel consumption, and increased flight range of the aircraft. They can adapt to the complex mission profile requirements of different flight missions and achieve performance optimization within a larger flight envelope. They are the preferred power for future sixth-generation fighter jets and supersonic airliners. To adapt to the continuously increasing turbine inlet gas temperature, cooling of the blades is crucial. Among them, the cooling of adjustable turbine blades is a key technology required for aero-engines to achieve adaptive cycles and combine high thrust and high efficiency. It can reduce several cooling problems brought by traditional variable incidence angle adjustable blades.

[0003] In the existing typical cooling structures of multi-channel high-pressure turbine rotor blades, impingement cooling is used at the leading edge of the blade, serpentine channels with turbulator ribs are used in the middle part of the blade, and a split slot structure is used at the trailing edge of the blade due to space structure limitations. However, the gradual increase in the turbine inlet temperature of the engine has brought a series of problems and challenges to the cooling design of turbine guide vanes. For example, the leading edge of the blade not only has to withstand high temperature and high heat load, but also the pressure ratio between the cold gas side and the hot gas side is relatively small. In addition, the design of dense film holes is restricted by factors such as blade strength, machinability, and the required cold gas volume. These challenges need to be solved through innovative cooling technologies and design optimizations to ensure the reliability and efficiency of the engine in high-temperature environments. Summary of the Invention

[0004] Object of the Invention: Aiming at the disadvantages that the existing cooling structures are restricted by various factors and it is difficult to improve the cooling efficiency, the present invention provides a suction surface adjustable guide vane structure combined with double-wall cooling, which cools the blade through an innovative cooling structure and effectively improves the cooling efficiency of the adjustable blade.

[0005] Technical Solution: To solve the above problems, the present invention adopts a suction surface adjustable guide vane structure combined with double-wall cooling, including a fixed pressure surface, an adjustable suction surface, and a driving device for driving the adjustable suction surface to rotate. The adjustable suction surface is rotatably mounted on the fixed pressure surface through a rotating shaft. A cavity is formed by surrounding the fixed pressure surface and the adjustable suction surface. It is characterized in that first openings and second openings are oppositely arranged on the wall surface of the fixed pressure surface, and a double-wall cooling structure is provided on the adjustable suction surface. The double-wall cooling structure includes an inner wall and an outer wall. A cooling cavity is formed by surrounding the inner wall and the outer wall. The inner wall is close to the fixed pressure surface side. An air inlet hole is provided on the inner wall, an exhaust hole is provided on the outer wall, and turbulator columns are provided between the inner wall and the outer wall.

[0006] Furthermore, the fixed pressure surface includes a main pressure surface, a first end wall, and a second end wall. A rotating shaft groove for installing a rotating shaft is provided on the main pressure surface. The first end wall and the second end wall are arranged on both sides of the main pressure surface. The first opening is located on the first end wall, and the second opening is located on the second end wall.

[0007] Furthermore, a groove is formed on the wall surface of the first end wall close to the main pressure surface, and the main pressure surface is snap-fitted and installed in the groove.

[0008] Furthermore, the second end wall and the main pressure surface are integrally formed.

[0009] Furthermore, an L-shaped baffle is provided on the inner side of the top of the main pressure surface, and one side of the adjustable suction surface is slidably installed in the L-shaped baffle.

[0010] Furthermore, an arc-shaped groove is formed on the wall surface of the adjustable suction surface installed in the L-shaped baffle. Small rolling needles are provided in the arc-shaped groove, and the small rolling needles are also in rolling connection with the L-shaped baffle.

[0011] Furthermore, the driving device includes a driving cam and a sliding hanging bracket. The sliding hanging bracket is fixed on the inner wall. The driving cam is connected to the sliding hanging bracket, and a camshaft is provided on the driving cam. The two ends of the camshaft are respectively connected to the first end wall and the second end wall. The camshaft is also connected to a driving motor. The driving cam is in abutting contact with the inner wall, and the adjustable suction surface is driven to rotate by the rotation of the driving cam.

[0012] Furthermore, a through hole is formed on the driving cam, and the sliding hanging bracket is installed in the through hole.

[0013] Furthermore, the leading edges of the blades of the fixed pressure surface and the adjustable suction surface are rounded.

[0014] Furthermore, the spoiler columns are arranged equidistantly and uniformly, and the number of spoiler columns is 15 - 20.

[0015] Beneficial effects: Compared with the prior art, the remarkable advantages of the present invention are: (1) By reasonably arranging the double-wall cooling structure, convective heat transfer is achieved, and spoiler columns are provided for turbulent heat transfer, improving the heat transfer efficiency, enhancing the cooling effect of the adjustable suction surface, and improving the overall cooling performance of the blade; (2) Small rolling needles are provided to reduce resistance, making the rotation of the adjustable suction surface smoother, and sealing the blade to reduce the leakage of cold air from the top of the blade; (3) The rotation angle of the adjustable suction surface is accurately controlled by the driving cam, improving the adaptability and flexibility of the blade to different working conditions. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the adjustable guide vane structure of the suction surface of the present invention;

[0017] Figure 2Schematic diagram of the overall structure of the adjustable suction surface guide vane structure of the present invention from another perspective;

[0018] Figure 3 Schematic diagram of the internal structure of the adjustable suction surface guide vane structure of the present invention;

[0019] Figure 4 Schematic diagram of the inner and outer side surfaces of the first end wall of the present invention;

[0020] Figure 5 Schematic diagram of the second end wall and the installation position of the driving cam of the present invention;

[0021] Figure 6 Schematic longitudinal sectional view of the double-wall cooling structure of the present invention;

[0022] Figure 7 Schematic cross-sectional view of the double-wall cooling structure of the present invention;

[0023] Figure 8 Schematic diagram of the installation structure of the driving cam and the sliding hanger of the present invention;

[0024] Figure 9 Schematic diagram of the rotation process of the adjustable suction surface of the present invention. Detailed implementation manners

[0025] As Figure 1 and Figure 2 shown, a suction surface adjustable guide vane structure combined with double-wall cooling in this embodiment includes a fixed pressure surface and an adjustable suction surface 2. The adjustable suction surface 2 is rotatably installed on the fixed pressure surface through a rotating shaft 9, and a cavity is formed by surrounding the fixed pressure surface and the adjustable suction surface 2. The fixed pressure surface includes a main pressure surface 1, a first end wall 4, and a second end wall 3. A rotating shaft groove for installing the rotating shaft 9 is provided on the main pressure surface 1, and a rotating shaft groove is also provided at the bottom of the adjustable suction surface 2. The rotating shaft 9 is installed in the rotating shaft groove. The leading edges of the blades of the fixed pressure surface and the adjustable suction surface 2 are rounded to slow down the influence of the blade opening on the airflow at the leading edge of the blade and delay the airflow separation.

[0026] As Figure 3 shown, an L-shaped baffle 12 is provided inside the top of the main pressure surface 1, and one side of the adjustable suction surface 2 is slidably installed in the L-shaped baffle 12. An arc-shaped groove 13 is provided on the wall surface of the adjustable suction surface 2 installed in the L-shaped baffle 12, and small rolling needles 11 are provided in the arc-shaped groove 13. The small rolling needles 11 are also in rolling connection with the L-shaped baffle 12. When the adjustable suction surface 2 rotates, the small rolling needles 11 roll between the adjustable suction surface 2 and the L-shaped baffle 12 to reduce the friction between the adjustable suction surface 2 and the main pressure surface 1, so that the flow field of the adjustable suction surface 2 can complete the rotation, and the small rolling needles 11 can play a certain sealing role to reduce the leakage of cold air from the top of the blade.

[0027] The first end wall 4 and the second end wall 3 are arranged on both sides of the main pressure surface 1. The first end wall 4 is provided with a first opening 5, and the second end wall 3 is provided with a second opening 7. The first opening 5 and the second opening 7 are arranged opposite to each other and are respectively used for air outlet and air inlet. As Figure 4 shown, a groove 15 is formed on the wall surface of the first end wall 4 close to the main pressure surface 1, and the main pressure surface 1 is snap-fitted into the groove 15. As Figure 5 shown, the second end wall 3 and the main pressure surface 1 are integrally formed.

[0028] As Figure 6 and Figure 7 shown, a double-wall cooling structure 10 is provided on the adjustable suction surface 2. The double-wall cooling structure 10 includes an inner wall and an outer wall, and a cooling cavity is formed by surrounding the inner wall and the outer wall. The inner wall is close to the fixed pressure surface side. An air inlet hole 17 is provided on the inner wall, an exhaust hole 6 is provided on the outer wall, and spoiler columns 19 are provided between the inner wall and the outer wall. The spoiler columns 19 are arranged equidistantly and uniformly, and the number of the spoiler columns 19 is 15 - 20. The spoiler columns have the function of enhancing heat transfer, and at the same time can support the double-wall structure, increasing the strength and stability of the blade structure.

[0029] As Figure 8 shown, a driving device for driving the adjustable suction surface 2 to rotate is provided in the cavity. The driving device includes a driving cam 16 and a sliding hanger 18. The sliding hanger 18 is fixed on the inner wall, and a through hole is formed on the driving cam 16. The sliding hanger 18 is installed in the through hole. A camshaft 8 is provided on the driving cam 16. Both ends of the camshaft 8 are respectively connected to the first end wall 4 and the second end wall 3, and the end of the camshaft 8 passes through the first end wall 4 and is connected to a driving motor (not shown in the figure). The driving cam 16 is in abutting contact with the inner wall, and the adjustable suction surface 2 is driven to rotate by the rotation of the driving cam 16, as Figure 9 shown.

[0030] The working principle of the suction surface adjustable guide vane structure of the present invention is as follows: The cold air enters the blade from the second opening 7. While the cold air convectively exchanges heat with the inner wall of the double-wall cooling structure 10, the cold air will also enter the cooling cavity from the air inlet hole 17, and turbulently exchanges heat through the spoiler columns 19, and then is discharged from the exhaust hole 6 on the outer wall. There is also part of the cold air that does not enter the cooling cavity and is directly discharged from the first opening 5.

[0031] By reasonably arranging the double-wall cooling structure, the present invention realizes convective heat transfer, and sets spoiler columns for turbulent heat transfer, improves the heat transfer efficiency, enhances the cooling effect of the adjustable suction surface, and improves the overall cooling performance of the blade. By setting small rolling needles to reduce the resistance, the rotation of the adjustable suction surface is made more smooth, and the blade is sealed to reduce the leakage of cold air from the top of the blade. By accurately regulating the rotation angle of the adjustable suction surface through the driving cam, the adaptability and flexibility of the blade to different working conditions are improved.

Claims

1. A suction surface adjustable guide vane structure combined with double wall cooling, characterized in that: The invention comprises a fixed pressure surface, an adjustable suction surface (2) and a driving device for driving the adjustable suction surface (2) to rotate, wherein the adjustable suction surface (2) is rotatably mounted on the fixed pressure surface via a rotating shaft (9), and the fixed pressure surface and the adjustable suction surface (2) surround and form a cavity, and is characterized in that a first opening (5) and a second opening (7) arranged opposite to each other are opened on the wall surface of the fixed pressure surface, and a double-wall cooling structure (10) is provided on the adjustable suction surface (2), and the double-wall cooling structure (10) comprises an inner wall and an outer wall, and the inner wall and the outer wall surround and form a cooling cavity, and the inner wall is close to the fixed pressure surface, and an air inlet hole (17) is provided on the inner wall, and an air exhaust hole (6) is provided on the outer wall, and a spoiler column (19) is provided between the inner wall and the outer wall.

2. The suction surface adjustable guide vane structure according to claim 1, characterized in that: The fixed pressure surface comprises a main pressure surface (1), a first end wall (4), and a second end wall (3); the main pressure surface (1) is provided with a shaft groove for mounting a shaft (9); the first end wall (4) and the second end wall (3) are arranged on both sides of the main pressure surface (1); the first opening (5) is located on the first end wall (4), and the second opening (7) is located on the second end wall (3).

3. The suction surface adjustable guide vane structure according to claim 2, characterized in that: A groove (15) is formed on the wall surface of the first end wall (4) close to the main pressure surface (1), and the main pressure surface (1) is snap-fitted and installed in the groove (15).

4. The suction surface adjustable guide vane structure according to claim 2, characterized in that: The second end wall (3) is made integrally with the main pressure surface (1).

5. The suction surface adjustable guide vane structure according to claim 2, characterized in that: An L-shaped baffle (12) is provided on the inner side of the top of the main pressure surface (1), and one side of the adjustable suction surface (2) is slidably installed in the L-shaped baffle (12).

6. The suction surface adjustable guide vane structure according to claim 5, characterized in that: The adjustable suction surface (2) is installed on a wall surface inside the L-shaped baffle (12) and has an arc groove (13). A small roller needle (11) is arranged inside the arc groove (13). The small roller needle (11) is also rollingly connected to the L-shaped baffle (12).

7. The suction surface adjustable guide vane structure according to claim 1, characterized in that: The driving device comprises a driving cam (16) and a sliding bracket (18). The sliding bracket (18) is fixed on the inner wall. The driving cam (16) is connected to the sliding bracket (18). A camshaft (8) is provided on the driving cam (16). Two ends of the camshaft (8) are respectively connected to the first end wall (4) and the second end wall (3). The camshaft (8) is also connected to a driving motor. The driving cam (16) is in contact with the inner wall. The rotation of the driving cam (16) drives the adjustable suction surface (2) to rotate.

8. The suction surface adjustable guide vane structure according to claim 7, characterized in that: The driving cam (16) is provided with a through hole, and the sliding hanger (18) is installed in the through hole.

9. The suction surface adjustable guide vane structure according to claim 1, characterized in that: The leading edges of the blades of the fixed pressure surface and the adjustable suction surface (2) are rounded.

10. The suction surface adjustable guide vane structure according to claim 1, characterized in that: The spoiler columns (19) are evenly arranged at equal distances, and the number of the spoiler columns (19) is 15-20.

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