发动机叶片榫槽仿形涡流传感器的设计

Design of the profiling eddy current sensor for the tongue and groove of the engine blade

针对特定的航空发动机涡轮叶片榫槽,设计了同心方形线圈仿形涡流传感器,在不同激励模式与激励频率下,对发动机叶片榫槽开展电磁学仿真检测试验。仿真结果表明,同心方形线圈传感器在激励频率为500 kHz与外线圈激励模式下,除了半径为0.05 mm,深为0.5 mm的圆形缺陷无法检出外,可以检测出长为1.0 mm,宽为0.2 mm或0.1 mm,深为0.5 mm或1.0 mm的4种纵向缺陷及半径为0.1 mm,深为0.5 mm或1.0 mm和半径为0.05 mm,深为1.0 mm的3种圆形缺陷。

In this paper,a concentric square coil profiling eddy current sensor is designed for a specific aero-engine turbine blade tongue and groove.Under different excitation modes and excitation frequencies,electromagnetic simulation tests are carried out on the engine blade tongue and groove.The simulation results show that under the excitation frequency of 500 kHz and the excitation mode of external coil,the concentric square coil sensor can detect four longitudinal defects with length of 1.0 mm,width of 0.2 mm or 0.1 mm,depth of 0.5 mm or 1.0 mm,and three circular defects with radius of 0.1 mm,depth of 0.5 mm or 1.0 mm,radius of 0.05 mm and depth of 1.0 mm.It was also found that the circular defects of radius of 0.05 mm with depth of 0.5 mm could not be detected.