A splash plate assembly and its application to a flame tube head structure

Abstract

The present application relates to the technical field of aero-engine, and discloses a splash baffle assembly and a flame tube head structure using the same. The splash baffle assembly is provided with a first cooling groove on the outer edge to cool the splash baffle assembly and the outer edge, greatly reduce the overall wall temperature gradient level of the splash baffle assembly, reduce the thermal stress of the outer edge of the splash baffle assembly during operation, and improve the operation reliability and long service life of the splash baffle assembly. In the flame tube head structure formed by the splash baffle assembly and the head adapter section, each cooling cavity is provided with a first necking at a position corresponding to the first cooling groove of the outer edge. When the cooling airflow flows through the first necking from the cooling cavity, the cooling effect of the outer edge of the splash baffle assembly and the downstream flame tube part is enhanced while the cooling airflow speed at the first cooling groove and the gas film coverage length at the outer edge of the splash baffle assembly are improved, thereby enhancing the cooling effect of the outer edge of the splash baffle assembly and the downstream flame tube part.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and discloses a splash deflector assembly and its application in the flame tube head structure. Background Technology

[0002] The splash guard assembly of an aero-engine provides thermal insulation protection for the transition section and vortex generator, among other head components. Based on existing experience with the flame tube, the wall temperature design technology of the splash guard assembly is one of the key technologies in the flame tube head design. Due to the thermal radiation from the high-temperature combustion gases inside the flame tube, the splash guard assembly operates in the high-temperature zone of the flame tube. After long-term use, the splash guard assembly at the flame tube head often experiences oxidation, ablation, and overheating issues, especially cracks on the outer edge, which affects its service life. Summary of the Invention

[0003] The purpose of this invention is to provide a splash guard assembly and its application in a flame tube head structure, which can significantly reduce the overall wall temperature gradient of the splash guard assembly, reduce thermal stress on the outer edge of the splash guard assembly during operation, and improve the operational reliability and service life of the splash guard assembly. The flame tube head structure formed by the splash guard assembly and the head transition section can increase the cooling airflow velocity at the first cooling tank and the gas film coverage length at the outer edge of the splash guard assembly, thereby enhancing the cooling effect on the outer edge of the splash guard assembly and downstream flame tube components.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0005] A splash guard assembly includes: a plurality of fan-shaped segments forming a structure of a flame tube splash guard assembly, each fan-shaped segment including an inner edge, an outer edge and sealing edges located on both sides of the fan-shaped segment; the outer edge is provided with a plurality of first cooling grooves through which cooling airflow can pass.

[0006] Furthermore, the inner edge is provided with a plurality of second cooling grooves through which cooling airflow can pass.

[0007] Furthermore, vent holes are provided on both sides of the sealing edge.

[0008] To achieve the above technical effects, the present invention also provides a flame tube head structure, including an annular head transition section, on which a splash deflector assembly is coaxially fixed. The fan-shaped segments of the splash deflector assembly are uniformly fixed circumferentially to the head transition section. The sealing edge of each fan-shaped segment contacts the head transition section. The head transition section, each fan-shaped segment, and its sealing edge together form a cooling cavity. The head transition section has impact holes at positions corresponding to the cooling cavity. The first cooling groove is located near the outer circumference edge of the head transition section, and each cooling cavity has a first constriction at a position corresponding to each first cooling groove.

[0009] Furthermore, the inner edge is provided with a plurality of second cooling grooves through which cooling airflow can pass. The second cooling grooves are located near the inner ring edge of the head transition section, and each cooling cavity is provided with a second constriction at a position corresponding to each second cooling groove.

[0010] Furthermore, each of the cooling chambers has an exhaust port on its two sealed sides that communicates with the cooling chamber.

[0011] Compared with the prior art, the beneficial effects of this invention are:

[0012] 1. The present invention provides a first cooling groove on the outer edge of the fan-shaped section of the splash shield assembly. After the cooling airflow is introduced into the cavity formed by the fan-shaped section and the flame tube head, it flows out from the first cooling groove at the outer edge, thereby cooling the splash shield assembly and its outer edge. This can significantly reduce the overall wall temperature gradient of the splash shield assembly, reduce the thermal stress on the outer edge of the splash shield assembly during operation, and improve the working reliability and service life of the splash shield assembly.

[0013] 2. In the flame tube head structure formed by the splash plate assembly and the head transition section, each cooling chamber has a first constriction at a position corresponding to the first cooling groove on the outer edge. When the cooling airflow flows from the cooling chamber through the first constriction, it cools the splash plate assembly and its outer edge, reduces the overall wall temperature gradient of the splash plate assembly, and increases the cooling airflow velocity at the first cooling groove and the air film coverage length at the outer edge of the splash plate assembly, thereby enhancing the cooling effect on the outer edge of the splash plate assembly and downstream flame tube parts. Attached Figure Description

[0014] Figure 1 This is a perspective view of the splash guard assembly in Embodiment 1 or 2;

[0015] Figure 2 This is a schematic diagram of the rotating surface structure of the flame tube head in Example 1 or 2;

[0016] Among them, 1. fan-shaped section; 2. inner edge; 3. outer edge; 4. sealing edge; 5. first cooling tank; 6. second cooling tank; 7. exhaust port; 8. head transition section; 9. cooling chamber; 10. impact hole; 11. first constriction; 12. second constriction; 13. flame tube central axis. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] Example 1

[0019] See Figure 1 and Figure 2 A splash guard assembly includes: a plurality of fan-shaped segments 1 forming a structure of a flame tube splash guard assembly, each of the fan-shaped segments 1 including an inner edge 2, an outer edge 3 and sealing edges 4 located on both sides of the fan-shaped segment 1; the outer edge 3 is provided with a plurality of first cooling grooves 5 through which cooling airflow can pass.

[0020] In this embodiment, multiple fan-shaped segments 1 are circumferentially installed around the central axis 13 of the flame tube at the head of the aero-engine flame tube, forming a flame tube splash deflector assembly structure. A first cooling groove 5 is provided on the outer edge 3 of the fan-shaped segment 1 of the splash deflector assembly. After the cooling airflow is introduced into the cavity formed by the fan-shaped segment 1 and the flame tube head, it flows out from the first cooling groove 5 at the outer edge 3, thereby cooling the splash deflector assembly and its outer edge 3. This can significantly reduce the overall wall temperature gradient level of the splash deflector assembly, reduce the thermal stress on the outer edge 3 of the splash deflector assembly during operation, and improve the working reliability and long service life of the splash deflector assembly.

[0021] In this embodiment, the inner edge 2 is provided with a plurality of second cooling grooves 6 through which cooling airflow can pass. After the cooling airflow is introduced into the cavity formed by the fan-shaped section 1 and the flame tube head, a portion of the cooling airflow flows out from the second cooling grooves 6 at the inner edge 2, thereby cooling the splash plate assembly and its inner edge 2. This can further reduce the overall wall temperature gradient level of the splash plate assembly and reduce the thermal stress of the inner edge 2 of the splash plate assembly during operation.

[0022] Moreover, in this embodiment, the first cooling groove 5 at the outer edge 3 and the second cooling groove 6 at the inner edge 2 of the fan-shaped segment 1 of the splash plate assembly can be obtained through simple machining. The structure is simple and easy to process. The width and length of the first cooling groove 5 at the outer edge 3 or the second cooling groove 6 at the inner edge 2 of the splash plate assembly can be adjusted by quick machining to obtain a satisfactory cooling and heat exchange effect and a suitable wall temperature level of the splash plate assembly, thereby improving the working reliability and long service life of the splash plate assembly.

[0023] Example 2

[0024] See Figure 1 and Figure 2 A flame tube head structure includes an annular head transition section 8, on which multiple splash-deflecting disc assemblies are fixed. The fan-shaped segments 1 of each splash-deflecting disc assembly are uniformly fixed circumferentially to the head transition section 8. The sealing edge 4 of each fan-shaped segment 1 contacts the head transition section 8. The head transition section 8, each fan-shaped segment 1, and its sealing edge 4 together form a cooling cavity 9. The head transition section 8 has impact holes 10 at positions corresponding to the cooling cavity 9. A first cooling groove 5 is located near the outer circumference edge of the head transition section 8, and each cooling cavity 9 has a first constriction 11 at a position corresponding to each first cooling groove 5.

[0025] In this embodiment, the installation process of the splash shield assembly and the head adapter section 8 is as follows: First, multiple fan-shaped segments 1 are installed to the corresponding installation positions of the head adapter section 8 (e.g., in this embodiment, the splash shield assembly includes 24 fan-shaped segments 1 evenly distributed around the perimeter). The end face of the hole of each fan-shaped segment 1 is flush with the end face of each installation position of the head adapter section 8. They are connected by brazing to ensure that each fan-shaped segment 1 and the sealing edges 4 on both sides form a cooling cavity 9 with the head adapter section 8. Each cooling chamber 9 has a first constriction 11 at a position corresponding to the first cooling groove 5 of the outer edge 3, forming a constricted cooling channel between the outer edge 3 of the fan-shaped segment 1 and the head transition segment 8. The channel height of the constricted cooling channel is less than the channel height of the cooling chamber 9. When the cooling airflow flows from the cooling chamber 9 through the first constriction 11, it cools the splash plate assembly and its outer edge 3, reduces the overall wall temperature gradient level of the splash plate assembly, and increases the cooling airflow velocity at the first cooling groove 5 and the air film coverage length at the outer edge 3 of the splash plate assembly, thereby enhancing the cooling effect on the outer edge 3 of the splash plate assembly and the downstream flame tube parts.

[0026] In this embodiment, the inner edge 2 is provided with multiple second cooling grooves 6 through which cooling airflow can pass. The second cooling grooves 6 are located near the inner ring edge of the head transition section 8. Each cooling cavity 9 is provided with a second constriction 12 at a position corresponding to each second cooling groove 6. When the cooling airflow flows from the cooling cavity 9 through the second constriction 12, it cools the inner edge 2 of the splash shield assembly while increasing the cooling airflow velocity at the second cooling grooves 6 and the air film coverage length at the inner edge 2 of the splash shield assembly, thereby further enhancing the cooling effect on the inner edge 2 of the splash shield assembly and the downstream flame tube components.

[0027] In this embodiment, exhaust holes 7 are provided on both sides of the sealing edge 4. The exhaust holes 7 can control a small portion of the cooling airflow to flow through the sealing edges 4 on both sides, thereby improving the cooling effect on the sealing edges 4 on both sides of the splash plate assembly and further ensuring the working reliability and long service life of the splash plate assembly.

[0028] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A splash guard assembly, comprising: Multiple fan-shaped segments (1) forming a flame tube splash deflector assembly structure, each of the fan-shaped segments (1) including an inner edge (2), an outer edge (3) and sealing edges (4) located on both sides of the fan-shaped segment (1); characterized in that the outer edge (3) is provided with multiple first cooling grooves (5) through which cooling airflow can pass; the cavity formed by the fan-shaped segment (1) and the flame tube head, the cavity being provided with a first constriction (11) at the position of the first cooling groove (5).

2. The splash guard assembly according to claim 1, characterized in that, The inner edge (2) is provided with a plurality of second cooling grooves (6) through which cooling airflow can pass.

3. The splash guard assembly according to claim 1, characterized in that, Vent holes (7) are provided on both sides of the sealing edge (4).

4. A flame tube head structure, characterized in that, The device includes a ring-shaped head adapter section (8), on which a splash shield assembly as described in claim 1 is coaxially fixed. The fan-shaped segments (1) of the splash shield assembly are uniformly fixed circumferentially on the head adapter section (8). The sealing edge (4) of each fan-shaped segment (1) is in contact with the head adapter section (8). The head adapter section (8) and each fan-shaped segment (1) and its sealing edge (4) together form a cooling cavity (9). The head adapter section (8) has an impact hole (10) at the position corresponding to the cooling cavity (9). The first cooling groove (5) is located near the outer ring edge of the head adapter section (8), and each cooling cavity (9) has a first constriction (11) at the position corresponding to each first cooling groove (5).

5. The flame tube head structure according to claim 4, characterized in that, The inner edge (2) is provided with a plurality of second cooling grooves (6) through which cooling airflow can pass. The second cooling grooves (6) are located near the inner ring edge of the head transition section (8). Each cooling cavity (9) is provided with a second constriction (12) at a position corresponding to each second cooling groove (6).

6. The flame tube head structure according to claim 4, characterized in that, Each of the cooling chambers (9) has an exhaust port (7) on its two sealed sides (4) that communicates with the cooling chamber (9).

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