A digital ray zone detection method for large gas turbine blades

Abstract

The invention discloses a method for blade digital ray partition detection of a large gas turbine. An X ray source and a flat panel detector are adopted to form a digital ray detection system. The X ray source performs transillumination on a to-be-measured blade through six groups of transillumination parameters, image gray undergoing transition from highlight all white to all black is formed on the flat panel detector, thickness change in each partition is determined, each transillumination partition is divided, an effective coverage is obtained through cutting, and finally splicing of a partition image is finished. According to the method, a ray transillumination area can be enlarged, operation is simplified, detection efficiency is improved, the method for blade digital ray partition detection of the gas turbine is standardized, internal defects of the gas turbine blade are extracted quickly, and the method is simple to operate, low in requirements for workers' technical level, high in efficiency during large-scale factory detection and high in practicality.

Description

【Technical field】 [0001] The invention belongs to the field of industrial ray non-destructive testing, and relates to a partition detection method applied to blades of large gas turbines. 【Background technique】 [0002] A gas turbine is a rotating impeller power machine. During work, the high-speed flowing fuel-air mixture (working medium) impacts the impeller to make it rotate, and then converts the internal energy and kinetic energy of the working medium into the kinetic energy of the impeller and acts externally through the output shaft. Gas turbines are widely used in two fields: on the one hand, they can be used as the energy input source of generating sets in the power generation system; on the other hand, they can be used as the engines of large ships to provide power for them. Gas turbines are power equipment of great strategic significance, but my country has not yet fully mastered the core technology of gas turbines, and related products mainly rely on foreign imp...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the lead wire occlusion is the blind area of ​​the detection, and the detection process is complicated; the cost of the film is high and it is difficult to save; the evaluation is usually done manually, which is greatly affected by experience and subjectivity

The traditional partition method greatly reduces the effective transillumination area due to the serious shielding of the leaves by the lead wire

And the partition operation is complicated, which greatly reduces the detection efficiency

Since the curvature and thickness of the leaves change continuously, the gray level of the image after transillumination changes evenly, and it is difficult to stitch the partitioned images

The traditional partition method has no specific quantitative standard, and there is no specific regulation on the parameters of the partition

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