Simulation of Pitting Corrosion on Gas Turbine Compressor Blade

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, University of Zanjan, Zanjan, Iran

2 Mechanical engineering departmant.university of zanjan

Abstract

The first row rotating blades of four axial-flow compressors were prematurely fractured. Previous investigations showed that the site atmosphere contains corrosive compounds which lead to an increase in the possibility of pitting on the blades. To this end, experimental and numerical studies are considered. Replica testing, scanning electron microscope and fractography of the broken blade indicate that the pits join together and make one bigger pit under stress-corrosion cracking mechanism which reduces the failure time. 3-D models of the pitting on the blade under existing forces are analyzed by COMSOL Multiphysics software. Finite element analysis shows good similarities with fractography photos. Stress concentration and interaction of stresses around the pits are two mechanical reasons for the initiation and growth of cracks. Calculations show that the occurrence of stress-corrosion cracking at the location of the pit reduces the crack initiation time to half. The presence of pits increased the stress by approximately 130 MPa relative to the healthy blade. The part between the two pits with a stress of approximately 180 MPa showed the interaction of the two pits in the operating conditions of the compressor blade.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 10
January 2022
Pages 5123-5140

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