Analysis of fatigue failure of Francis turbine runner at Derbendikhan hydropower station
Author
Source
Sulaimani Journal of Engineering Sciences
Issue
Vol. 4, Issue 4 (30 Jun. 2017), pp.7-13, 7 p.
Publisher
Publication Date
2017-06-30
Country of Publication
Iraq
No. of Pages
7
Main Subjects
Abstract EN
Fatigue failures in Francis turbine runner are frequently occurred in hydropower plants, causing unexpected plant downtime and considerable financial loss.
Decades of operational experience have shown that turbine runners develop fatigue cracks in areas, where stress concentrations and material defects coincide.
In Francis turbine runners, cracks tend to propagate from the transition of the welded Tjoint between the blade and the band or crown.
This type of turbine runner, which operate under a wide range of heads and outputs, are subjected to considerable dynamic forces which can lead to fatigue cracking.
The magnitude of these forces is a function of the hydraulic pressure, the water velocity and the geometry of the stationary parts guiding the water into the runner.
This paper presents the water pressure and bending stresses for different operational conditions in a Francis runner of a Derbendikhan hydropower station.
At the first step, the dynamic fluid calculation is used to determine the fluctuating water pressure on the blade of the runner.
At the second step, for a period of operational nominal bending stress due to the fluctuating water pressure are determined.
The result indicates that the hydropower plant was operated with the high fluctuating water pressure which is responsible for inducing bending stress response.
The high bending stress on the blade is a probable reason for fatigue failure.
Furthermore, the paper discusses the fatigue analysis of the runner.
Typical results are presented and discussed.
American Psychological Association (APA)
Said, Rida Abd Allah. 2017. Analysis of fatigue failure of Francis turbine runner at Derbendikhan hydropower station. Sulaimani Journal of Engineering Sciences،Vol. 4, no. 4, pp.7-13.
https://search.emarefa.net/detail/BIM-940890
Modern Language Association (MLA)
Said, Rida Abd Allah. Analysis of fatigue failure of Francis turbine runner at Derbendikhan hydropower station. Sulaimani Journal of Engineering Sciences Vol. 4, no. 4 (2017), pp.7-13.
https://search.emarefa.net/detail/BIM-940890
American Medical Association (AMA)
Said, Rida Abd Allah. Analysis of fatigue failure of Francis turbine runner at Derbendikhan hydropower station. Sulaimani Journal of Engineering Sciences. 2017. Vol. 4, no. 4, pp.7-13.
https://search.emarefa.net/detail/BIM-940890
Data Type
Journal Articles
Language
English
Notes
Record ID
BIM-940890