Air film hole inlet and outlet groove structure for lap joint laminate contact surface

Abstract

The invention discloses an air film hole inlet and outlet groove structure for a lap joint laminate contact surface. The air film hole inlet and outlet groove structure for the lap joint laminate contact surface is characterized in that an air film hole inlet and an air film hole outlet on the laminate contact surface with punched air film holes are subjected to hole diameter expansion treatment, that is, grooves are independently processed at the inlet and outlet positions, and then two laminates are overlapped and assembled. The grooves can be processed into a plurality of shapes, such as a conical shape, a cylindrical shape and a semispherical shape, and a proper groove shape can be selected according to specific conditions of a punching tool and the like. According to the air film hole inlet and outlet groove structure for the lap joint laminate contact surface, the corresponding air film holes in the lap joint laminates can effectively communicate, the problem that the corresponding air film holes of the two laminates are staggered due to processing errors is solved, and therefore the air film cooling effect on the lap joint laminates is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of aero-engines and thermal protection, and in particular relates to an inlet and outlet groove structure for air film holes on the contact surface of overlapping laminates. Background technique [0002] At present, the turbine inlet temperature of aero-engine continues to increase, and the turbine outlet temperature also increases accordingly. As the downstream part of the turbine, the rear casing bears the mechanical load of the engine on the one hand, and the thermal load brought by the high-temperature gas at the turbine outlet on the other hand. Therefore, it is necessary to cool the rear casing to ensure its safe and reliable operation. . [0003] Film cooling is widely used in the cooling process of the rear receiver. The processing methods of gas film holes mainly include laser drilling, electric spark drilling, electro-hydraulic beam drilling, etc., each method has its own advantages and disadvant...

AI Technical Summary

Problems solved by technology

Due to the existence of objective factors such as positioning errors and remelting layers, the inlet and outlet of the corresponding air film holes on the contact surface of the laminates often cannot be completely overlapped during assembly, and there is a certain degree of misalignment, which makes it impossible for some air film hole flow paths to be completely penetrated. , making film cooling less effective than expected

[0005] In order to avoid the misalignment of air film holes as far as possible in engineering, it is often avoided to design oblique air film holes on the overlapping laminates, but to choose relatively better positioned straight air film holes, which can reduce the probability of perforation misplacement and at the same time Improve the reliability of the air film hole, but the cooling efficiency of the straight air film hole is not as good as that of the oblique air film hole

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