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Journal of Mechanical Science and Technology

, Volume 27, Issue 4, pp 993–999 | Cite as

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

  • Ali Jahangiri
  • Seyed Ebrahim Moussavi Torshizi
  • Seyed Majid Yadavar Nikravesh
Article
  • 1k Downloads

Abstract

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).

Keywords

Fatigue failure Dimple rupture Fan blade Scanning electron microscope (SEM) Resonance Fan blade angle of attack Computational fluid dynamic (CFD) Finite element 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ali Jahangiri
    • 1
  • Seyed Ebrahim Moussavi Torshizi
    • 2
  • Seyed Majid Yadavar Nikravesh
    • 2
  1. 1.Faculty of Mechanical EngineeringSemnan UniversitySemnanIran
  2. 2.Faculty of Mechanical EngineeringPower and Water University of TechnologyTehranIran

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