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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).

The possible applications of steel solid node newly-patented “JAHANODE” in structural systems

Jahangiri A., Tahir M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

z. 99

24-25

The members of a building are joined through connections. The type of connection and the manner in which force in the members leads to the production of various structural systems in buildings are from among the main topics in the design and implementation of structures. In recent decades, considering the rapid development of modern technologies in other disciplines, the building industry has experienced a relatively slower growth for various reasons including the strength of materials and executive problems and the determining innovations and inventions. Thus, in the building industry, the demands for larger spans or greater numbers of levels along with the ever- increasing demand for new and varied functions or innovative architectural designs are always restricted by some limitations. Therefore, the construc- tion of modern mega structures or industrial buildings along with the hot issues concerning the economy of the design or the benchmarking or optimi- zation of structural members and new structural systems have always attracted the attention of those interested in the realm.