CN-117128539-B - Splash guard assembly and flame tube head structure applied by same

Abstract

The invention relates to the technical field of aeroengines, and discloses a splash guard assembly and a flame tube head structure applied to the splash guard assembly, wherein the splash guard assembly realizes the cooling of the splash guard assembly and the outer edge thereof by arranging a first cooling groove on the outer edge, the temperature gradient level of the whole wall of the splash guard assembly can be greatly reduced, the thermal stress in the working process of the outer edge of the splash guard assembly is reduced, the working reliability of the splash guard assembly is improved, and the long-term service life of the splash guard assembly is prolonged. In the flame tube head structure formed by the splash guard assembly and the head switching section, a first shrinkage mouth is arranged at the position of each cooling cavity corresponding to a first cooling groove at the outer edge, when cooling air flows through the first shrinkage mouth from the cooling cavity, cooling of the splash guard assembly and the outer edge thereof is realized, the integral wall temperature gradient level of the splash guard assembly is reduced, and meanwhile, the cooling air flow speed at the first cooling groove and the air film covering length at the outer edge of the splash guard assembly can be improved, so that the cooling effect on the outer edge of the splash guard assembly and the downstream flame tube parts is enhanced.

Inventors

• CHENG RONGHUI
• ZHOU SUNYU
• SU JIAN
• LI PENGYU
• QIU JUNYUAN
• ZHANG JIANGUO
• WANG PEI
• XU BING
• ZHAO YATING
• WANG QING

Assignees

• 中国航发四川燃气涡轮研究院

Dates

Publication Date

20260505

Application Date

20230810

Claims (6)

1. 1. A splash guard assembly comprises a plurality of fan-shaped sections (1) forming a flame tube splash guard assembly structure, wherein each fan-shaped section (1) comprises an inner edge (2), an outer edge (3) and sealing edges (4) positioned on two sides of the fan-shaped section (1), and the splash guard assembly is characterized in that the outer edge (3) is provided with a plurality of first cooling grooves (5) through which cooling air flows, a cavity is formed by the fan-shaped section (1) and the head of the flame tube, and a first shrinkage opening (11) is formed in the position of the first cooling grooves (5).
2. 2. A splash guard assembly according to claim 1, wherein the inner rim (2) is provided with a plurality of second cooling channels (6) through which a cooling air flow may pass.
3. 3. Splash guard assembly according to claim 1, characterized in that the sealing edges (4) on both sides are provided with vent holes (7).
4. 4. The flame tube head structure is characterized by comprising a head switching section (8) of an annular structure, wherein the head switching section (8) is coaxially fixed with a splash guard assembly according to claim 1, a fan-shaped section (1) of the splash guard assembly is uniformly fixed on the head switching section (8) in a circumferential direction, a sealing edge (4) of each fan-shaped section (1) is contacted with the head switching section (8), the head switching section (8) is surrounded with each fan-shaped section (1) and the sealing edge (4) thereof to form a cooling cavity (9), an impact hole (10) is formed in a position, corresponding to the cooling cavity (9), of the head switching section (8), the first cooling grooves (5) are located at positions close to the outer ring edge of the head switching section (8), and first shrinkage ports (11) are formed in positions, corresponding to the first cooling grooves (5), of each cooling cavity (9).
5. 5. The structure of a burner head according to claim 4, characterized in that said inner rim (2) is provided with a plurality of second cooling grooves (6) through which a cooling air flow can pass, said second cooling grooves (6) being located close to the inner annular edge of the head transition section (8), each of said cooling cavities (9) being provided with a second constriction (12) in a position corresponding to each second cooling groove (6).
6. 6. The flame tube head structure according to claim 4, wherein exhaust holes (7) communicated with the cooling cavities (9) are formed in the sealing edges (4) on two sides corresponding to each cooling cavity (9).

Description

Splash guard assembly and flame tube head structure applied by same Technical Field The invention relates to the technical field of aeroengines, and discloses a splash guard assembly and a flame tube head structure applied to the splash guard assembly. Background The splash guard assembly of the aeroengine can realize the heat insulation protection effect on head devices such as the switching section, the vortex device and the like. According to the prior flame tube use experience, the wall temperature design technology of the splash guard assembly is one of the key technologies of the flame tube head design, the splash guard assembly works in a high temperature zone of the flame tube under the influence of high-temperature gas heat radiation in the flame tube, the problem that the splash guard assembly oxidizes and ablates over-temperature after the flame tube head splash guard assembly is used for a long time often occurs, and particularly, the outer edge of the splash guard assembly is easy to crack, so that the service life is influenced. Disclosure of Invention The invention aims to provide a splash guard assembly and a flame tube head structure applied to the splash guard assembly, which can greatly reduce the temperature gradient level of the whole wall of the splash guard assembly, reduce the thermal stress in the working process of the outer edge of the splash guard assembly, improve the working reliability of the splash guard assembly and prolong the service life of the splash guard assembly. The flame tube head structure formed by the splash guard assembly and the head switching section can improve the cooling airflow speed at the first cooling groove and the air film coverage length at the outer edge of the splash guard assembly, so that the cooling effect on the outer edge of the splash guard assembly and the downstream flame tube parts is enhanced. In order to achieve the technical effects, the technical scheme adopted by the invention is as follows: A splash guard assembly comprises a plurality of fan-shaped sections forming a flame tube splash guard assembly structure, wherein each fan-shaped section comprises an inner edge, an outer edge and sealing edges positioned on two sides of the fan-shaped section, and the outer edge is provided with a plurality of first cooling grooves through which cooling air flows. Further, the inner edge is provided with a plurality of second cooling grooves through which cooling air flows. Further, exhaust holes are formed in the sealing edges on the two sides. The invention further provides a flame tube head structure, which comprises a head switching section with an annular structure, wherein a splash guard assembly is coaxially fixed on the head switching section, the fan-shaped sections of the splash guard assembly are uniformly fixed on the head switching section in an annular mode, the sealing edges of the fan-shaped sections are in contact with the head switching section, the fan-shaped sections and the sealing edges thereof are encircled to form a cooling cavity, an impact hole is formed in the head switching section at a position corresponding to the cooling cavity, the first cooling groove is located at a position close to the outer ring edge of the head switching section, and a first shrinkage opening is formed in the position corresponding to each first cooling groove. Further, the inner edge is provided with a plurality of second cooling grooves through which cooling air flows can pass, the second cooling grooves are positioned close to the inner ring edge of the head switching section, and each cooling cavity is provided with a second necking at a position corresponding to each second cooling groove. Further, exhaust holes communicated with the cooling cavities are formed in the sealing edges on the two sides corresponding to each cooling cavity. Compared with the prior art, the invention has the following beneficial effects: 1. According to the invention, the first cooling groove is arranged at the outer edge of the fan-shaped section of the splash guard assembly, and the cooling air flows out of the first cooling groove at the outer edge after being led into the cavity formed by the fan-shaped section and the flame tube head, so that the splash guard assembly and the outer edge of the splash guard assembly are cooled, the integral wall temperature gradient level of the splash guard assembly can be greatly reduced, the thermal stress of the splash guard assembly in the outer edge working process is reduced, the working reliability of the splash guard assembly is improved, and the long service life of the splash guard assembly is prolonged. 2. In the flame tube head structure formed by the splash guard assembly and the head switching section, a first shrinkage mouth is arranged at the position of each cooling cavity corresponding to a first cooling groove at the outer edge, when cooling air flows through the first shrinkage mouth from the cooling