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Failure analysis (experimental and numerical approach) of gas turbine generator cooling fan in comparison between using 2types (14◦ and 19◦ angle of attack) of blades

Jahangiri A., Torshizi S. E. M., Nikravesh S. M. Y.

Engineering Transactions

2013

Vol. 61, iss. 2

99--117

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 a short circuit between rotor and stator and consequently generator explosion and ﬁnancial problems. The fracture of cooling fan blades has occurred ﬁve times at the turbine side of the generator in our case of study, just 100hr after resuming operations after an overhaul. Using numerical analysis as well as laboratory investigation – including visual inspections, metallography and SEM – can help better ﬁnd failure problems that cause blade failures. A series of numerical analysis was performed to diagnose the possible cause of failure. CFD analysis is used to study the airﬂow distribution in order to observe probable separation phenomenon and pressure forces as they are imposed on 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).