Turbulent flow threaded hole cooling structure for trailing edge of turbine blade and turbine blade

Abstract

The invention provides a turbulent flow threaded hole cooling structure for a trailing edge of a turbine blade, which is arranged in the trailing edge area of the turbine blade, and is formed by cutting off part of the wall surface of a pressure surface of the trailing edge of the turbine blade, only reserving the wall surface on one side of a suction surface and arranging a plurality of separation ribs. Cylindrical cooling holes which penetrate through the separation ribs along the flow direction of cooling air flow are formed in the separation ribs; the center line of the cylindrical cooling hole is parallel to the center line of a trailing edge cold air inlet cavity; and turbulent flow threads are arranged in the cylindrical cooling holes. Cooling airflow in the threaded holes can generate a remarkable cooling effect on the inner and outer surfaces of the separation ribs, the heat exchange area is increased through the turbulent flow threaded structures in the holes, and the convective heat exchange strength of the inner surfaces of the separation ribs is enhanced; meanwhile, the internal heat exchange of the wall surface of the suction surface can be enhanced, the blank of the split seam separation rib cooling design is filled up, and the comprehensive cooling effect of the trailing edge is improved.

Description

technical field [0001] The invention belongs to the technical field of gas turbine blade cooling, and in particular relates to a cooling structure of a spoiler threaded hole for the trailing edge of a turbine blade. Background technique [0002] The increase of turbine inlet gas temperature plays a key role in the improvement of aeroengine performance and engine thrust-to-weight ratio. At present, the gas temperature at the front inlet of the turbine of advanced military and civil aero-engines has exceeded 2000K. With the further development of aero-engines, the temperature at the front-inlet of the turbine will further increase. But keep improving. It can be seen that in order to effectively protect the high-pressure turbine guide vanes, in addition to the development of high-temperature resistant materials, efficient cooling measures must be taken. As a typical slit cooling area, the trailing edge of the turbine blade needs to take into account both cooling characteristi...

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Problems solved by technology

[0005] Aiming at the problem that the cooling of the surface of the partition rib is neglected in the design stage of the cooling structure of the trailing edge in the prior art, and the cooling efficiency of the surface of the partition rib is low due to the insufficient cooling of the side near the suction side of the trailing edge, the present invention proposes a method for Spoiler screw hole cooling structure on the trailing edge of the turbine blade

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