Crescent dune type impact air film cooling structure with transverse air flow grooves

Abstract

The invention provides a crescent dune type impact air film cooling structure with a transverse air flow groove. The crescent dune type impact air film cooling structure comprises a wall surface structure with a certain thickness, a cylindrical air film inclined hole, a crescent dune type air film cover and the transverse air flow groove. Cooling working media are sprayed out through the cylindrical air film inclined holes, jet flow is used for impacting the inner wall of the crescent dune type air film cover, the impact cooling effect of the cooling working media on the inner wall of the air film cover is effectively improved, and part of the cooling working media are sprayed out in the spanwise direction through the transverse air flow grooves in the lower section of the crescent dune type air film cover and cover the wall face of the hot end to form a cooling film. And the other part flows out from the downstream opening of the crescent dune type gas film cover to form a cooling gas film along the flow direction. According to the scheme, the air film cooling effect can be effectively improved, the crescent dune type air film cover can prevent a cooling working medium from being directly mixed with main flow through jet flow, the wall attaching effect of the cooling air film is enhanced, the cooling working medium can be flatly spread in the spanwise direction through the design of the transverse air flow groove, and the spanwise uniformity of the cooling film is improved.

Description

technical field [0001] The invention belongs to the technical field of gas turbine engines, and in particular relates to a crescent-dune-shaped impinging air film cooling structure with transverse air flow grooves. Background technique [0002] With the continuous development of gas turbines and the continuous improvement of combustion efficiency, the requirements for heat resistance of high-temperature components of gas turbine engines continue to increase. big key. The principle of air film cooling technology is to spray the cooling medium at a specific angle through the air film hole channel on the surface, so as to form a layer of cooling film with a lower temperature between the surface structure and the high temperature medium, which acts as an insulation. The effect of high temperature gas reducing the surface temperature. [0003] The effect of film cooling will be affected by many factors, and the factors affecting the effect of film cooling are mainly divided int...

AI Technical Summary

Problems solved by technology

With the traditional cylindrical air film hole structure, under the condition of high blowing ratio, the momentum of the cooling medium at the exit of the air film hole is likely to be too large, which will cause the cooling medium to be ejected in the form of a jet and flow with the mainstream. At the same time, a dead zone is formed downstream of the film hole, and the cooling effect of the film is greatly reduced. Changing the geometry of the film hole is an effective way to solve this problem

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