Combined-type cooling seal structure for high-pressure turbine rotor exterior ring

Abstract

The invention discloses a combined-type cooling seal structure for a high-pressure turbine rotor exterior ring. The structure comprises a combustion chamber outer casing, the high-pressure turbine rotor exterior ring and auxiliary seal structures. Segmentation design is used for the high-pressure turbine rotor exterior ring; an opposite face of an upper blade of the high-pressure turbine rotor exterior ring is coated with a high-temperature resistant abrasive coating; impact cooling holes are formed along circumferences of the combustion chamber outer casing; and a connecting structure betweenthe combustion chamber outer casing and the high-pressure turbine rotor exterior ring is improved, so a cool air chamber is formed between the combustion chamber outer casing and the high-pressure turbine rotor exterior ring. In this way, the high-pressure turbine rotor exterior ring can be cooled efficiently through cool air jet-flow impacting. Through configuration of the auxiliary seal structures such as a seal ring and a seal baffle, cool air can be sealed, so a thermal load of a high-temperature component, namely the high-pressure turbine rotor exterior ring can be reduced; thermal deformation of the hot-end component can be controlled; a usage amount of the cool air is reduced; cooling effects are maximized; and the structure is more stable and reliable.

Description

technical field [0001] The present invention relates to the field of aero-engines and gas turbines, in particular to the improvement of the cooling and sealing structure of the outer ring of the high-pressure turbine rotor. By opening impact cooling holes in the outer casing of the combustion chamber, the outer ring of the high-pressure turbine rotor is split-coupled with auxiliary sealing rings and sealing sheets. , The way of high temperature resistant and wearable coating improves the cooling and sealing effect, reduces the thermal load of this high temperature component, and improves the stability and reliability of the structure. Background technique [0002] The outer ring of the high-pressure turbine rotor is located downstream of the high-pressure turbine guide, close to the outlet of the combustion chamber, and directly contacts the high-temperature gas at the outlet of the combustion chamber. It is one of the parts with the highest temperature and the worst working ...

AI Technical Summary

Problems solved by technology

Once the outer ring of the full-ring high-pressure turbine rotor is damaged, the entire ring needs to be replaced, which is costly and poor in maintainability

Another design is a split structure, but there is a large gap between the outer rings of the high-pressure turbine rotors of each two petals, which is not sealed, resulting in a large gas consumption for cooling and sealing

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