航空发动机涡轮叶片裂纹的阵列涡流检测仿真

doi:10.7527/S1000-6893.2013.0516

Abstract

Abstract:

The eddy current array testing technique features a large range of detection, strong adaptability, and many other advantages, which make it suitable for rapid aero-engine turbine blade detecting. In this paper a finite element eddy current array testing model of engine turbine blade cracks is established, and the signal characteristics are studied of the eddy current arrayed sensors for the concave and convex surfaces of the turbine blades. The simulation results show that the electromotive force of the detecting coil increases gradually with convex, plane and concave surfaces when the lift-off distance between the eddy current probe and the blade body is constant. The sensitivity of detecting coil electromotive force for longitudinal cracks can reach 12.5 times that of the excitation coil, and the distance between the peak and trough electromotive force can represent the length of the longitudinal crack with an error of less than 1.0 mm. The transverse crack depth and the trough amplitude of the detecting coil electromotive force show a relationship of monotone decreasing. The simulation results can be used to guide engine turbine blade testing in engineering practice.

Key words: turbine blade, eddy current array, cracks, finite element, electromotive force

CLC Number:

SONG Kai, LIU Tangxian, LI Laiping, WEI Quan, TU Jun. Simulation on Aero-engine Turbine Blade Cracks Detection Based on Eddy Current Array[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(8): 2355-2363.

References

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Simulation on Aero-engine Turbine Blade Cracks Detection Based on Eddy Current Array

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