Accurate wall thickness control modeling method for inside profile of blade body of turbine air cooling blade

Abstract

The invention provides an accurate wall thickness control modeling method for the inside profile of a blade body of a turbine air cooling blade. According to the method, when blade body inside profile curves are constructed, the thickness of the blade body is controlled through eight wall thickness control points on the top section and the bottom section; firstly, the blade body tail edge curve is rapidly and accurately positioned; then, the positions of the wall thickness control points are automatically adjusted, and the blade basin curve and the blade back curve are generated through interpolation; finally, the front edge curve is established. The number of the control points is increased to eight, so that the wall thickness control effect is improved; the tail edge curve is established before the blade basin curve and the blade back curve are established, so that changing of the arc position of the tail edge is avoided, and accurate and rapid positioning of the tail edge curve is achieved; by screening interpolation points, the changing rule of the outline of the tail edge curved surface of the inside profile of the blade body is consistent with that of the tail edge of the outside profile of the blade body, the curved surface is smooth, and the blade body wall thickness control effect can well meet wall thickness design requirements.

Description

technical field [0001] The invention relates to the field of design of the inner shape of the blade body of a turbine air-cooled blade, in particular to a modeling method for precise wall thickness control of the inner shape of the blade body of a turbine air-cooled blade. Background technique [0002] Air-cooled blades of aero-engine turbines have complex structures. In order to meet the requirements of cooling, weight reduction and strength performance, the blades are generally made of thinner hollow structures. The airfoil segment is composed of an outer shape and an inner shape, and the inner shape is generated by matching with the outer shape free-form surface and is controlled by the wall thickness. Because some blades are long along the trailing edge direction, the wall thickness control is difficult, the trailing edge adjustment is cumbersome and the accuracy is low, the existing design method can no longer meet the requirements, so it is necessary to find a fast and...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of insufficient control of the inner wall thickness of the existing blade airfoil section and the inability to accurately locate the trailing edge curve, the present invention proposes a modeling method for accurate wall thickness control of the inner shape of the turbine air-cooled blade airfoil. When using 8 wall thickness control points on the top section and bottom section to control the thickness of the blade body, first quickly and accurately locate the trailing edge curve of the blade body, and then automatically adjust the position of the wall thickness control points to generate the blade basin and blade back curves by interpolation. Finally create the leading edge curve

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