Turbine guider end wall cooling test piece with slot and air film capable of being replaced independently

Abstract

The invention discloses a turbine guider end wall cooling test piece with a slot and an air film capable of being independently replaced. The turbine guider end wall cooling test piece comprises an upper end wall and a lower end wall, the right side of the lower end wall is connected with a right wall surface; the upper end wall and the lower end wall are the same in structure, and the left wall face and the right wall face are the same in structure. The upper end wall and the lower end wall are each provided with an air film cooling structure and a slot cooling structure, the air film cooling structures and the slot cooling structures are each provided with an independent cooling cavity, and the air film cooling structures and the slot cooling structures are adjacent to each other and provided with connecting holes in one-to-one correspondence. According to the cooling test piece, a single cooling structure can be replaced in the process of optimizing and testing the composite cooling structure of the end wall of the turbine guider, and compared with the process of machining and replacing the cooling structure of the whole end wall, the time required by machining and the economic cost are reduced by machining and replacing the single cooling structure; and different cooling structures can be combined more flexibly.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengine design, and in particular to a turbine guide vane end wall cooling test piece with independently replaceable slots and air films. Background Art

[0002] The end wall of the turbine guide vane of an aircraft engine faces extremely high heat loads. The continuously increasing turbine inlet temperature causes the end wall to be exposed to an environment higher than the melting point of the material for a long time. Therefore, a variety of cooling technologies are required to ensure the normal operation of the turbine guide vane end wall.

[0003] Currently, there are two common cooling methods for the turbine guide vane end wall, namely, turbine guide vane end wall film cooling and slot cooling.

[0004] Air film cooling is achieved by designing air film holes on the end wall surface of the turbine guide vane, using the outflow of cold air to form an air film covering the end wall surface, isolating the high-temperature combustion gas from direct contact with the end wall, and thus protecting the end wall.

[0005] Slot cooling uses cold air from the combustion chamber-turbine joint to cool the turbine guide vane end wall surface.

[0006] However, it is difficult to achieve full coverage of the end wall by cooling the turbine guide vane end wall with a single cooling structure. In order to improve the cooling effect of the end wall, a composite cooling form of multiple cooling structures has been proposed. The design of a composite cooling structure is bound to require multiple rounds of iterations and test verification processes. In addition, the design of the turbine guide vane end wall cooling structure test piece is generally an overall design of the end wall, that is, the composite cooling structure of the end wall is processed as a whole. During the experiment, if a certain cooling structure in the cooling structure needs to be replaced, the entire test piece needs to be reprocessed, which means that every time one of the cooling structures needs to be optimized, it is necessary to pay additional time and economic costs for processing the test pieces of other parts of the end wall.

[0007] Therefore, based on the above technical problems, technicians in this field urgently need to develop a turbine guide vane end wall cooling test piece in which the slots and air films can be replaced independently. Summary of the invention

[0008] The purpose of the present invention is to provide a turbine guide vane end wall cooling test piece with independently replaceable slots and air films. The split structure helps to reduce the processing time and economic cost required to replace a certain cooling structure test piece during the cooling structure test process.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] The invention discloses a turbine guide end wall cooling test piece in which a slot and an air film can be replaced independently. The end wall cooling test piece comprises an upper end wall and a lower end wall;

[0011] The left side of the upper end wall is connected to a left wall surface, and the right side of the lower end wall is connected to a right wall surface;

[0012] The upper end wall and the lower end wall have the same structure, and the left wall surface and the right wall surface have the same structure;

[0013] The upper end wall and the lower end wall are both installed with an air film cooling structure and a slot cooling structure, wherein the air film cooling structure and the slot cooling structure both have cooling cavities independent of each other, and the air film cooling structure and the slot cooling structure are adjacent to each other to avoid having one-to-one corresponding connection holes;

[0014] The upper end wall and the lower end wall, the upper end wall and the left wall surface, and the lower end wall and the right wall surface are all positioned, assembled and fixed by means of stepped surfaces.

[0015] Furthermore, a right wall connecting flange is provided at the position where the right wall is connected to the lower end wall;

[0016] The inner surface of the right wall is protruding to form a wall leaf-shaped protrusion.

[0017] Furthermore, a lower end wall step mating surface and a lower end wall right wall surface flange located on the side of the lower end wall step mating surface are formed at the position where the lower end wall and the right wall surface are mated;

[0018] The right wall connecting flange of the right wall cooperates with the lower end wall connecting right wall flange to achieve the positioning connection between the right wall and the lower end wall.

[0019] Furthermore, the film cooling structure and the slot cooling structure are integrated close to each other on the lower end wall;

[0020] The lower end wall is respectively assembled and fixed with the air film cooling structure and the slot cooling structure through corresponding connecting flanges.

[0021] Furthermore, the matching positions of the lower end wall, the air film cooling structure and the slot cooling structure form a stepped assembly surface, and the lower end wall is respectively provided with an air film connecting flange connected to the connecting flange of the air film cooling structure, and a slot connecting flange connected to the connecting flange of the slot cooling structure.

[0022] Furthermore, a lower end wall slot end cover is provided at the connection between the slot cooling structure and the slot connecting flange;

[0023] The air film cooling structure and the slot cooling structure are both protrudingly extended with a cold air inlet pipe, and an air film end cover is installed at the end of the cold air inlet pipe of the air film cooling structure.

[0024] Furthermore, the portion of the cold air inlet pipe extending into the corresponding cooling cavity is formed into a honeycomb flow-blocking structure.

[0025] Furthermore, the position where the cooling structure of the lower end wall cooperates with the cooling structure of the upper end wall can be replaced by the observation plate.

[0026] Furthermore, the mounting structure between the upper end wall and the left wall surface is the same as the mounting structure between the lower end wall and the right wall surface;

[0027] The mounting structure of the upper end wall, the air film cooling structure and the slot cooling structure is the same as the mounting structure of the lower end wall, the air film cooling structure and the slot cooling structure.

[0028] In the above technical solution, the present invention provides a turbine guide vane end wall cooling test piece with independently replaceable slots and air films, which has the following beneficial effects:

[0029] The cooling test piece of the present invention can be used to replace a single cooling structure during the optimization and testing of the composite cooling structure of the turbine guide vane end wall. Machining and replacing a single cooling structure reduces the time and economic cost required for machining compared to machining and replacing the cooling structure of the entire end wall, and different cooling structures can be combined more flexibly.

[0030] The structural design method of the present invention can observe the experimental effect inside the leaf channel through the observation plate without affecting the flow channel of the test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A schematic diagram of a test piece flow channel of a turbine guide vane end wall cooling test piece in which a slot and an air film can be replaced independently disclosed in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a blade-shaped protrusion on the inner wall surface of the right wall surface of a turbine guide vane end wall cooling test piece in which a slot and an air film can be replaced independently disclosed in an embodiment of the present invention;

[0034] Figure 3A schematic structural diagram of a lower end wall step mating surface of a turbine guide vane end wall cooling test piece in which a slot and an air film can be replaced independently disclosed in an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of a composite cooling structure of a lower end wall of a turbine guide vane end wall cooling test piece in which a slot and an air film can be replaced independently disclosed in an embodiment of the present invention;

[0036] Figure 5 A schematic structural diagram of an air film cooling cavity of an air film cooling structure of a turbine guide vane end wall cooling test piece in which a slot and an air film can be replaced independently disclosed in an embodiment of the present invention;

[0037] Figure 6 A schematic structural diagram of a slot cooling cavity of a slot cooling structure of a turbine guide vane end wall cooling test piece in which the slot and the air film can be replaced independently disclosed in an embodiment of the present invention;

[0038] Figure 7 A stepped assembly structure for connecting the lower end wall and the cooling structure of a turbine guide vane end wall cooling test piece in which the slot and the air film can be replaced independently disclosed in an embodiment of the present invention;

[0039] Figure 8 A schematic diagram of an air film cavity end cover of a turbine guide end wall cooling test piece in which a slot and an air film can be replaced independently disclosed in an embodiment of the present invention;

[0040] Fig. 9 It is a schematic diagram of the observation effect of the lower end wall cooling structure of a turbine guide vane end wall cooling test piece in which the slots and the air films can be replaced independently disclosed in an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1. Upper end wall; 2. Lower end wall; 3. Left wall surface; 4. Right wall surface; 5. Right wall surface connecting flange; 6. Wall leaf-shaped protrusion; 7. Lower end wall stepped matching surface; 8. Lower end wall connected to right wall surface flange; 9. Air film cooling structure; 10. Slot cooling structure; 11. Lower end wall air film end cover; 12. Lower end wall slot end cover; 13. Air film cooling cavity connecting hole; 14. Slot cooling cavity connecting hole; 15. Stepped assembly surface; 16. Slot connecting flange; 17. Air film connecting flange; 18. Honeycomb flow-blocking structure; 19. Cold air inlet; 20. Slot observation plate; 21. Air film observation plate. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] See also Figures 1 to 9 As shown;

[0045] The present embodiment is a turbine guide vane end wall cooling test piece in which the slot and the air film can be replaced independently, and the end wall cooling test piece includes an upper end wall 1 and a lower end wall 2;

[0046] The left side of the upper end wall 1 is connected to a left wall surface 3, and the right side of the lower end wall 2 is connected to a right wall surface 4;

[0047] The upper end wall 1 and the lower end wall 2 have the same structure, and the left wall surface 3 and the right wall surface 4 have the same structure;

[0048] The upper end wall 1 and the lower end wall 2 are both installed with an air film cooling structure 9 and a slot cooling structure 10, wherein the air film cooling structure 9 and the slot cooling structure 10 have cooling cavities independent of each other, and the air film cooling structure 9 and the slot cooling structure 10 are adjacent to each other to avoid opening one-to-one corresponding connection holes;

[0049] The upper end wall 1 and the lower end wall 2, the upper end wall 1 and the left wall surface 3, and the lower end wall 2 and the right wall surface 4 are all positioned, assembled and fixed by means of stepped surfaces.

[0050] Secondly, the installation structure of the upper end wall 1 and the left wall 3 of this embodiment is the same as the installation structure of the lower end wall 2 and the right wall 4; and, the installation structure of the upper end wall 1 and the air film cooling structure 9 and the slot cooling structure 10 are the same as the installation structure of the lower end wall 2 and the air film cooling structure 9 and the slot cooling structure 10.

[0051] Therefore, the present application further explains and illustrates the structure on one side of the lower end wall 2 and the structural connection relationship, so as to define both the upper end wall 1 and the lower end wall 2.

[0052] See also Figure 2 As shown, preferably, a right wall connecting flange 5 is provided at the position where the right wall 4 of this embodiment is connected to the lower end wall 2; and a wall leaf-shaped protrusion 6 is formed on the inner surface of the right wall 4. Figure 5 and Figure 6 As shown, firstly, the air film cooling structure 9 and the slot cooling structure 10 of the present embodiment both have cooling cavities independent of each other, and the air film cooling structure 9 and the slot cooling structure 10 are adjacent to each other to avoid having one-to-one corresponding connecting holes; the two independent cooling structures are connected by bolts to ensure the air tightness of the composite structure.

[0053] See also Figure 2 and Figure 3 As shown, preferably, the position where the lower end wall 2 and the right wall surface 4 cooperate with each other forms a lower end wall step matching surface 7, and a lower end wall connecting right wall surface flange 8 located on the side of the lower end wall step matching surface 7; first, Figure 2, the main structure of the right wall 4 of this embodiment is shown, which has a right wall connection flange 5 and a wall leaf-shaped protrusion 6 formed on the side. Based on this: the right wall connection flange 5 of the right wall 4 of this embodiment cooperates with the lower end wall connection right wall flange 8 to achieve the positioning connection between the right wall 4 and the lower end wall 2.

[0054] See also Figure 4 As shown, preferably, the air film cooling structure 9 and the slot cooling structure 10 of this embodiment are integrated close to each other on the lower end wall 2;

[0055] The lower end wall 2 is respectively equipped with a fixed air film cooling structure 9 and a slot cooling structure 10 through corresponding connecting flanges.

[0056] Specifically, see Figure 7 As shown, the matching position of the lower end wall 2 of this embodiment and the air film cooling structure 9 and the slot cooling structure 10 forms a stepped assembly surface 15, and the lower end wall 2 is respectively provided with an air film connecting flange 17 connected to the connecting flange of the air film cooling structure 9, and a slot connecting flange 16 connected to the connecting flange of the slot cooling structure 10.

[0057] Also, see Figure 4 and Figure 7 As shown, a lower end wall slot end cover 12 is provided at the connection between the slot cooling structure 10 and the slot connecting flange 16 of this embodiment; both the air film cooling structure 9 and the slot cooling structure 10 are provided with protruding cold air inlet pipes, and an air film end cover 11 is installed at the end of the cold air inlet pipe of the air film cooling structure 9.

[0058] See also Figure 8 As shown, the portion of the cold air intake pipe extending into the corresponding cooling cavity is formed into a honeycomb flow-blocking structure 18 .

[0059] The cooling structure of this embodiment is connected to the end wall structure through a flange structure, and the step assembly structure and the flange assembly structure cooperate with each other to ensure accurate positioning and good air tightness when the cooling structure is connected to the end wall structure.

[0060] In order to better observe the test and the specific conditions inside the test piece's leaf channel, the position where the cooling structure of the lower end wall 2 and the upper end wall 1 cooperate can be replaced by an observation plate.

[0061] By replacing the upper end wall cooling structure with an observation plate, it is more convenient to observe the experimental effect of the lower end wall cooling structure. The observation plate is divided into a slot observation plate 20 and an air film observation plate 21.

[0062] In the above technical solution, the present invention provides a turbine guide vane end wall cooling test piece with independently replaceable slots and air films, which has the following beneficial effects:

[0063] The cooling test piece of the present invention can be used to replace a single cooling structure during the optimization and testing of the composite cooling structure of the turbine guide vane end wall. Machining and replacing a single cooling structure reduces the time and economic cost required for machining compared to machining and replacing the cooling structure of the entire end wall, and different cooling structures can be combined more flexibly.

[0064] The structural design method of the present invention can observe the experimental effect inside the leaf channel through the observation plate without affecting the flow channel of the test piece.

[0065] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films, characterized in that: The end wall cooling test piece comprises an upper end wall (1) and a lower end wall (2); The left side of the upper end wall (1) is connected to a left wall surface (3), and the right side of the lower end wall (2) is connected to a right wall surface (4); The upper end wall (1) and the lower end wall (2) have the same structure, and the left wall surface (3) and the right wall surface (4) have the same structure; The upper end wall (1) and the lower end wall (2) are both provided with an air film cooling structure (9) and a slot cooling structure (10), wherein the air film cooling structure (9) and the slot cooling structure (10) each have cooling cavities independent of each other, and the air film cooling structure (9) and the slot cooling structure (10) are adjacent to each other so as to avoid having one-to-one corresponding connection holes; The upper end wall (1) and the lower end wall (2), the upper end wall (1) and the left wall surface (3), and the lower end wall (2) and the right wall surface (4) are all positioned, assembled and fixed by means of stepped surfaces.

2. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 1, characterized in that: A right wall connecting flange (5) is provided at the position where the right wall (4) is connected to the lower end wall (2); The inner surface of the right wall surface (4) is protruding to form a wall leaf-shaped protrusion (6).

3. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 2, characterized in that: A lower end wall step mating surface (7) is formed at the position where the lower end wall (2) and the right wall surface (4) are mated, and a lower end wall connecting right wall surface flange (8) is located on the side of the lower end wall step mating surface (7); The right wall connecting flange (5) of the right wall (4) cooperates with the lower end wall connecting right wall flange (8) to achieve positioning connection between the right wall (4) and the lower end wall (2).

4. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 3, characterized in that: The air film cooling structure (9) and the slot cooling structure (10) are integrated close to each other on the lower end wall (2); The lower end wall (2) is respectively assembled and fixed with the air film cooling structure (9) and the slot cooling structure (10) via corresponding connecting flanges.

5. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 4, characterized in that: The mating positions of the lower end wall (2) and the air film cooling structure (9) and the slot cooling structure (10) form a stepped assembly surface (15), and the lower end wall (2) is respectively provided with an air film connecting flange (17) connected to the connecting flange of the air film cooling structure (9), and a slot connecting flange (16) connected to the connecting flange of the slot cooling structure (10).

6. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 5, characterized in that: A lower end wall slot end cover (11) is provided at the connection between the slot cooling structure (10) and the slot connecting flange (16); The air film cooling structure (9) and the slot cooling structure (10) are both provided with protruding cold air inlet pipes, and the end of the cold air inlet pipe of the air film cooling structure (9) is provided with an air film end cover (11).

7. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 6, characterized in that: The portion of the cold air inlet pipe extending into the corresponding cooling cavity is formed into a honeycomb flow-blocking structure (18).

8. The turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to claim 5, characterized in that: The position at which the cooling structure of the lower end wall (2) cooperates with the cooling structure of the upper end wall (1) can replace the cooling structure of the upper end wall (1) through an observation plate.

9. A turbine guide vane end wall cooling test piece with independently replaceable slots and air films according to any one of claims 1 to 8, characterized in that: The mounting structure between the upper end wall (1) and the left wall surface (3) is the same as the mounting structure between the lower end wall (2) and the right wall surface (4); The installation structure of the upper end wall (1) and the air film cooling structure (9) and the slot cooling structure (10) is the same as the installation structure of the lower end wall (2) and the air film cooling structure (9) and the slot cooling structure (10).

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