A parametric design method for the shape of the root section of the air-cooled turbine blade

Abstract

The invention provides a root extending segment appearance parameterization design method of a turbine air-cooling moving blade. A root extending segment appearance section line set capable of being parameterized is built, an auxiliary geometry body is acquired, a bridging curve is built, the free-form surface of the root extension segment appearance is acquired through the covering method, other planes of the root extending segment appearance are acquired through the boundary control method, a formed sealed root extending segment appearance curve body is converted to an entity, and a final root extending segment appearance entity is acquired. Through the method, the complex root extending segment appearance modeling problem is converted to a plurality of problems of surface modeling, the auxiliary geology body is built, and the continuity of the root extending segment appearance curve and a tenon appearance curve on the boundary G1 is achieved accordingly; because root extending segment appearance section lines capable of being parameterized are built, the root extending segment appearance is more scientific and reasonable in design, and the method can be better applied to the engineering design field.

Description

Technical field [0001] The invention relates to the field of shape design of the root section of a turbine air-cooled moving blade, in particular to a parameterized design method for the shape of the root section of a turbine air-cooled moving blade. Background technique [0002] Aero-engine blades are the key components of aero-engines. They have the characteristics of complex structure, large variety, large quantity, large impact on engine performance, and long design and manufacturing cycle. Among the aero-engine blades, the turbine rotor blade with an air-cooled structure is the most complicated. In addition to the complicated inner cavity structure, there is a root section structure between the edge plate and the tenon. It is a very complicated and cumbersome process to comprehensively consider factors such as internal cavity air flow, strength, turbine disk and tenon structure, and blade weight in the design of root extension structure. [0003] Related domestic personnel ha...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a parametric design method for the shape of the root extension section of the turbine air-cooled moving blade in view of the current situation of insufficient research on the shape of the root extension of the existing blade. Curve operations such as edges and other curves are used to construct parametric root profile section line groups, and then stretched to obtain the auxiliary geometry required in the process of constructing the root profile, and then create a bridge curve group, and constrain the bridge curve group to ensure that it is consistent with the auxiliary geometry shape at the same time The curved surface and the plane G1 on both sides of the shape of the tenon are continuous; use the skinning method and the boundary control method to obtain the shape surface of the root shape, and ensure that the shape surface of the longitudinal part is continuous with the auxiliary geometry and the surface G1 of the tenon shape; finally, the closed space surface group Converted to a solid body to get the final root shape

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