压气机叶片根部原位检测传感器的设计与制作

Design and Fabrication of Eddy Current Testing Sensors for Compressor Blade Roots

在外场航空维修中,发动机叶片根部原位探伤时存在涡流检测传感器适用性不强、灵敏度低、可达性差的难题。基于涡流环理论,结合压气机叶片根部的形状特点,对传感器的磁芯检测面进行加工制作,设计与叶片根部吻合度高的仿形涡流检测传感器,实现对叶片根部疲劳裂纹缺陷的原位检测。试验结果表明:新设计的仿形传感器能够消除因为叶片根部形状不规则带来的提离影响,且传感器稳定性好、灵敏度高。

When the aircraft is inspected and repaired at the field, the eddy current testing sensor has the problems of poor applicability, low sensitivity and poor accessibility when inspecting the engine blade root in-situ. In order to detect the fatigue crack defect on the root of the blade, in this paper, the core detection surface of sensor is processed and a profiled eddy current detection sensor with a high degree of coincidence with the root of the blade is designed, based on the swirl ring theory and the shape characteristics of the root of the compressor blade. The experimental result shows that the newly designed profiling sensor can eliminate the lift-off effect because of the irregular shape of the blade root, and the sensor has good stability and high sensitivity.