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Failure analysis of gas turbine generator cooling fan for 14° and 19° — blades angle of attack

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In gas turbine power plants, a fan is used as a cooling system to dissipate generated heat in coils (copper conductors) and generator electric circuits at the end sides of its rotor. In some cases, fracture of blades causes short circuit between rotor and stator and consequently generator explosion and made lot of financial problems. The fracture of cooling fan blades has been occurred five times at the turbine side of the generator in our case of study, just 100 hr after resuming operation after overhaul. Using numerical analysis as well as laboratory investigation — includes visual inspections, metallography and SEM — can help better finding failure problems that cause blade failures. A series of numerical analysis was performed to diagnose the cause of failure possibility. CFD analysis is used to study the airflow distribution in order to observe probable separation phenomenon and pressure forces that they are imposed to fan blades due to operation. A finite element method was utilized to determine the stresses and dynamic characteristics of the fan blade (natural frequencies, stresses and vibrations).

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Correspondence to Ali Jahangiri.

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Recommended by Associate Editor Youngseong Lee c KSME & Springer

Ali Jahangiri received B.S. degree in Power plant Engineering from Power and Water University of Technology (PWUT), Iran in 2006. He then received his M.S. degree in Energy conversion from Shiraz University in 2009. In 2009, he was accepted as a Ph.D. student in Energy conversion in Semnan University, Iran. His research interests include power plants, heat transfer, fluid mechanics, and CFD.

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Jahangiri, A., Torshizi, S.E.M. & Nikravesh, S.M.Y. Failure analysis of gas turbine generator cooling fan for 14° and 19° — blades angle of attack. J Mech Sci Technol 27, 993–999 (2013).

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