Cross type X air film hole cooling structure used for turbine blade

Abstract

The invention discloses a cross type X air film hole cooling structure used for a turbine blade. Two rows of cross type X air film holes are formed in an air film hole plate in the flow direction andare each formed by two cylindrical air film holes in a cross manner, and outlets of the two cylindrical air film holes in each row have certain inclination angles in the extending direction. By meansof the cross type X air film holes, jet flow can be divided towards the two sides more easily, and extending coverage of the jet flow is increased. Through the interaction of the cross type X air filmholes in the front row and the back row, involution opposite vortexes are formed on the downstream portions of the air film holes, cold air leaving the cross type X air film holes is closely attachedto the wall face, and the downstream wall faces of the air film holes are effectively protected. Each cross type X air film hole is provided with two air film hole inlets, two strands of cold air canbe mixed in the intersection area of the two holes, and the air outlet amount of the two outlets of each cross type X air film hole is more uniform. The cross type X air film holes have the advantages that the structure is simple, processing is easy, and the air film covering effect is good.

Description

technical field [0001] The invention relates to the cooling technology of the turbine blades of gas turbines, in particular to a cross-type X air film hole cooling structure for the turbine blades. technical background [0002] With the improvement of the performance of the gas turbine, the temperature of the inlet of the turbine continues to increase, and the temperature of the inlet of the advanced aero-engine turbine has exceeded the maximum temperature of the blade material. Therefore, effective cooling measures must be used to ensure the safety and reliability of the turbine blades. run. Film cooling is one of the typical cooling methods used on blades. Air film cooling is to inject a low-temperature airflow near the wall along a tangent or at a certain angle. Under the action of the mainstream pressure and the Coanda effect, this cold air is attached to the wall to form a cold air film with a lower temperature. The wall surface is isolated from the high-temperature g...

AI Technical Summary

Problems solved by technology

Although the expansion hole can effectively improve the cooling effect, its processing is more complicated than that of the cylindrical hole, and the most serious thing is that the aerodynamic loss caused by the expansion hole is greater than that of the cylindrical hole.

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