Failure analysis of second row compressor blades

The duty of air compressor in a gas turbine is to supply air for combustion and spine the pressure turbine. In frame type turbine many failure and wide range of damages have been reported in all of the world. Disruption of one blade can heavily damage the other components and a shutdown cause in the gas turbine which can impose many other costs to the system. Metallurgical and finite element investigations of damaged blades of second stage of compressor in the frame type gas turbine in one of occurred in an on-shore gas complex, showed high cycle fatigue (HCF) and foreign object damages (FOD) which was the result of separation of a piece of a blade and clashing with other blades, were main reasons of failure.

Keywords:

failure analysis , compressor blades , high cycle fatigue , foreign object damage