Casing structure with leaf apex interval control and leaf tip flow control

A technology of flow control and blade tip clearance, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of blade tip leakage loss, large thermal expansion deformation, etc., to reduce leakage loss, easy processing, and reduce diameter effect on deformation
CN107435563AActive Publication Date: 2017-12-05NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2017-12-05

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Abstract

The invention discloses a casing structure with leaf apex interval control and leaf tip flow control. A turbine casing and an impact plate form a first cavity, multiple impact holes are limited in the impact plate, a turbine outer ring form a second cavity, multiple turbulent structures, and an air film hole structure and a leak-proof structure are limited on the outer ring; cold air flow enters the first cavity through an air incoming hole, enters the second cavity through an impact hole structure to impact the outer ring, fully cools the turbine outer ring through the turbine structures and flows out from the air film hole structure of the outer ring to form a cooling air film to be finally mixed with main fuel gas; a boss structure on the turbine outer ring is mainly used for blocking formation and development of leaf tip leakage vortex. Heat exchange effect of cooling airflow inside the casing is enhanced, the air film hole structure has good cooling effect on the surface of the turbine casing and a leaf tip position in direct contact with high-temperature fuel gas, the leakage-proof structure effectively lowers leaf tip leakage loss, and turbine efficiency is improved.
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Description

technical field

[0001] The invention relates to a turbine casing structure, in particular to a casing structure with blade tip clearance control and blade top flow control applicable to machinery such as aero-engines and gas turbines. Background technique

[0002] With the continuous improvement of gas turbine performance, the inlet temperature of the turbine continues to increase, and more efficient and advanced cooling technologies are urgently needed to ensure the normal operation of high-temperature components of the gas turbine. As one of the high-temperature components, the turbine casing is directly in contact with the mainstream gas, and the working conditions are harsh. The high-temperature resistance of the material alone cannot withstand high-temperature erosion for a long time; at the same time, the turbine casing expands and deforms under the action of high temperature. As a result, the blade tip clearance becomes larger, which seriously affects the turbine effi...

Claims

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