Phased array ultrasonic detection method for defects of blade root of gas compressor blade of gas turbine

The invention discloses a phased array ultrasonic detection method for blade root defects of a gas turbine compressor blade, the blade root does not need to be disassembled in the detection process, nondestructive detection is carried out on an easy-to-crack area of the blade root of the compressor by adopting a phased array ultrasonic imaging detection mode, and the blade root defect of the gas turbine compressor is obtained by combining simulation calculation on the premise of obtaining the structural size of the blade root. Probe parameters and scanning parameters are determined, the correctness of the scanning parameters is verified through a reference block processed with artificial defects, finally, detection is implemented, and a detection map and an artificial defect map are compared and analyzed. According to the phased array ultrasonic detection method for the defects of the blade root of the gas turbine compressor blade, the defects such as cracks at the root of the in-service compressor blade and