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

SONG Kai; LIU Tangxian; LI Laiping; WEI Quan; TU Jun

doi:10.7527/S1000-6893.2013.0516

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2014 , Vol. 35 >Issue 8: 2355 - 2363

DOI: https://doi.org/10.7527/S1000-6893.2013.0516

Material Engineering and Mechanical Manufacturing

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

SONG Kai ,
LIU Tangxian ,
LI Laiping ,
WEI Quan ,
TU Jun

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1. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China;
2. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China

Received date: 2013-09-21

Revised date: 2013-12-18

Online published: 2014-01-03

Supported by

National Natural Science Foundation of China (51265041);Innovation Fund for Technology Based Aerospace Shanghai;Science and Technology Project in Jiangxi Province Department of Education (GJJ12444);Foundation for Key Laboratory of Nondestructive Testing of Ministry of Education of China (ZD201029003)

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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

Cite this article

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 . DOI: 10.7527/S1000-6893.2013.0516

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