CN-119844797-B - Combustion chamber wall surface with cooling holes locally encrypted and swirl combustion chamber

Abstract

The application provides a combustion chamber wall surface with locally encrypted cooling holes and a swirl combustion chamber, which comprises a combustion chamber wall surface, wherein a plurality of cooling holes are arranged on the combustion chamber wall surface and distributed according to a temperature distribution curve of the combustion chamber wall surface. According to the application, the plurality of cooling holes are distributed according to the temperature distribution curve of the wall surface of the combustion chamber, and as the distance between the cooling holes and the adjacent holes is directly related to the local temperature, the cooling holes are denser at the place with higher temperature, so that the cooling effect is improved, the temperature of the wall surface is reduced, and the generation of local high temperature is avoided.

Inventors

• GE BING
• LU XIANG
• JIN MING
• CHI ZHONGRAN
• ZANG SHUSHENG

Assignees

• 上海交通大学

Dates

Publication Date

20260512

Application Date

20250303

Claims (5)

1. 1. The combustion chamber wall surface with the partially encrypted cooling holes is characterized by comprising a combustion chamber wall surface (1); A plurality of cooling holes are formed in the combustion chamber wall surface (1), and the cooling holes are distributed according to a temperature distribution curve of the combustion chamber wall surface (1): The axial positions of the cooling holes in the same row are the same, the axial distances between the cooling holes in different rows and the adjacent rows are inversely proportional to the average wall temperature near the cooling holes in the corresponding row, and the conditions are satisfied that: Wherein i and j represent the ith row and the jth row of cooling holes along the flow direction, sy is the average axial distance between the cooling holes and two adjacent rows of cooling holes, tw is the average temperature of the wall surfaces of the cooling holes of the corresponding rows, and alpha is the axial encryption coefficient; the arrangement mode of the cooling holes along the transverse direction of the wall surface is that the transverse distance between any cooling hole and the adjacent cooling hole is inversely proportional to the temperature of the wall surface near the corresponding cooling hole, and the following conditions are satisfied: Wherein m and n represent the mth and nth cooling holes, sx is the average transverse distance between the cooling hole and two adjacent cooling holes, tw is the wall temperature near the corresponding cooling hole, and beta is the transverse encryption coefficient; the total number of the cooling holes is unchanged after the cooling holes are distributed according to the temperature distribution curve.
2. 2. The combustion chamber wall with locally encrypted cooling hole according to claim 1, wherein the axial encryption coefficient alpha and the transverse encryption coefficient beta are in the range of 0.5-1.5.
3. 3. The combustion chamber wall with locally encrypted cooling holes according to claim 1, characterized in that the inclination angle θ of the cooling holes is 20-30 °.
4. 4. A swirl-flow combustion chamber characterized in that the wall surface of the combustion chamber is locally encrypted by using the cooling holes according to any one of claims 1 to 3.
5. 5. The swirl-combustor according to claim 4, characterized by comprising a combustor wall (1), a flame tube (2), a swirler (3) and a cold air chamber (4); One end of the flame tube (2) is provided with a cyclone (3), the flame tube (2) is internally provided with a combustion chamber wall surface (1) for distributing cooling holes according to a temperature distribution curve, and the combustion chamber wall surface (1) separates a cavity in the flame tube (2) from a cold air cavity (4).

Description

Combustion chamber wall surface with cooling holes locally encrypted and swirl combustion chamber Technical Field The invention relates to the field of combustion chamber structures, in particular to a combustion chamber wall surface with locally encrypted cooling holes and a swirl combustion chamber. Background The wall surface of the combustion chamber of the gas turbine is in a high-temperature extreme environment, and the safety and the service life of the combustion chamber can be ensured by adopting a high-efficiency cooling mode. However, the advanced combustion mode requires a large amount of air to participate in combustion rather than to be used as cooling gas, and thus it is important how to improve the cooling effect under a limited amount of cooling gas. It was found by search that there is a combustion chamber divergent stave related invention. The invention of patent number CN113217949a, for example, proposes a combustion chamber divergent cooling structure and ramjet engine combustion chamber, which reduces the amount of cooling air required and improves the specific blow and thrust performance of the engine. Patent number CN203769943U discloses an engine structure and a divergent cooling structure. However, these inventions have the disadvantage that the local cooling effect is significantly lower than the design point due to the local high temperature and hot spots caused by the swirl impingement of the swirl flow, which is widely used in the combustion chamber to stabilize the flame. The wall surfaces mentioned in the inventions all adopt uniformly arranged cooling holes, and the problem of local high temperature cannot be solved. Disclosure of Invention Aiming at the defects in the prior art, the invention aims to provide a combustion chamber wall surface with locally encrypted cooling holes and a swirl combustion chamber. The invention provides a combustion chamber wall surface with locally encrypted cooling holes, which comprises a combustion chamber wall surface; The combustion chamber wall surface is provided with a plurality of cooling holes, and the cooling holes are distributed according to a temperature distribution curve of the combustion chamber wall surface: The axial positions of the cooling holes in the same row are the same, the axial distances between the cooling holes in different rows and the adjacent cooling holes are inversely proportional to the average wall temperature near the cooling holes in the corresponding row, and the conditions are satisfied that: Sy,iTw,iα＝Sy,jTw,jα wherein i and j represent the ith row and the jth row of cooling holes, sy is the average axial distance between the cooling holes and two adjacent rows of cooling holes, tw is the average temperature of the wall surfaces of the cooling holes of the corresponding rows, and alpha is the axial encryption coefficient; Preferably, the cooling holes of the wall surface along the transverse direction are arranged in such a way that the distance between any cooling hole and the adjacent cooling hole is inversely proportional to the temperature of the wall surface near the corresponding cooling hole, and the following conditions are satisfied: Sx,mTw,mβ＝Sx,nTw,nβ Wherein m and n represent the mth and nth cooling holes, sx is the average transverse distance between the cooling holes and two adjacent rows of cooling holes, tw is the average temperature of the wall surface of the corresponding cooling hole, and beta is the transverse encryption coefficient. Preferably, the axial encryption coefficient α and the lateral encryption coefficient β range from 0.5 to 1.5. Preferably, the inclination angle θ of the cooling hole is 20 to 30 °. Preferably, the total number of the cooling holes after distribution according to the temperature distribution curve is unchanged. Preferably, the swirl combustion chamber adopts the combustion chamber wall surface with the cooling holes for partial encryption, and comprises a combustion chamber wall surface, a flame tube, a swirler and a cold air cavity; one end of the flame tube is provided with a cyclone, the flame tube is internally provided with a combustion chamber wall surface for distributing cooling holes according to a temperature distribution curve, and the combustion chamber wall surface separates a cavity in the flame tube into a cold air cavity. Compared with the prior art, the invention has the following beneficial effects: 1. According to the application, the plurality of cooling holes are distributed according to the temperature distribution curve of the wall surface of the combustion chamber, and as the distance between the cooling holes and the adjacent holes is directly related to the local temperature, the cooling holes are denser at the place with higher temperature, so that the cooling effect is improved, the temperature of the wall surface is reduced, and the generation of local high temperature is avoided. 2. The application keeps the total number of