Phased Array Ultrasonic Testing Technology for In-service Gas Turbine Compressor Blade Roots
To solve the problem in detection of cracks of in-service gas turbine compressor blade roots,the CIVA simulation software is used to explore the feasibility of phased array ultrasonic testing of blade roots of 9E type compressors.In the simulation,self-focusing linear array probe is used to determine the parameters of testing process.Verification is carried out on specialized comparative test blocks with natural crack defects and artificial groove defects.Through simulation and laboratory verification,it is found that crack defects with a height of more than 4mm have a good detection rate.During the technical promotion process,a crack defect at the in-service gas turbine compressor blade roots was discovered,which was verified by magnetic particle inspection.Through numerical simulation,laboratory verification,and engineering application,it has been verified that phased array ultrasonic testing technology can meet the requirements of defect detection for in-service compressor blade roots.
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